In practical applications,noble metal doping is often used to prepare high performance gas sensors,but more noble metal doping will lead to higher preparation costs.In this study,CeO_(2)/ZnO-Pd with low palladium cont...In practical applications,noble metal doping is often used to prepare high performance gas sensors,but more noble metal doping will lead to higher preparation costs.In this study,CeO_(2)/ZnO-Pd with low palladium content was prepared by ultrasonic method with fast response and high selectivity for acetone sensing.With the same amount of palladium added,the selectivity coefficient of CeO_(2)/ZnO-Pd is 1.88 times higher than that of the stirred sensor.Compared with the pure PdO-doped CeO_(2)/ZnO-PdO material,the content of Pd in CeO_(2)/ZnO-PdO is about 30%of that in CeO_(2)/ZnO-PdO,but the selectivity coefficient for acetone is 2.56 times higher.The CeO_(2)/ZnO-Pd sensor has a higher response(22.54)to 50×10^(−6) acetone at 300℃and the selectivity coefficient is 2.57 times that of the CeO_(2)/ZnO sensor.The sensor has a sub-second response time(0.6 s)and still has a 2.36 response to 330×10^(−9) of acetone.Ultrasonic doping makes Pd particles smaller and increases the contact area with gas.Meanwhile,the composition of n-p-n heterojunction and the synergistic effect of Pd/PdO improve the sensor performance.It shows that ultrasonic Pd doping provides a way to improve the utilization rate of doped metals and prepare highly selective gas sensors.展开更多
Ternary Au/Fe2O3-ZnO gas-sensing materials were synthesized by combining co-precipitation and microwave irradiation process.The as-prepared Au/Fe2O3-ZnO was characterized with X-ray diffractometer and scanning electro...Ternary Au/Fe2O3-ZnO gas-sensing materials were synthesized by combining co-precipitation and microwave irradiation process.The as-prepared Au/Fe2O3-ZnO was characterized with X-ray diffractometer and scanning electron microscope,and its gas-sensing performance was measured using a gas-sensor analysis system.The results show that the as-prepared products consist of hexagonal wurtzite ZnO,face-centered cubic gold nanoparticles and orthorhombic Fe2O3crystallines.The Au/Fe2O3-ZnO based sensor has a very high selectivity to ethanol and acetone,and also has high sensitivity(154)at a low working temperature(270°C)and an extremely fast response(1s)against acetone.It is found that the selectivity can be adjusted by Fe2O3content added in the ternary materials.It possesses a worth looking forward prospect to practical applications in acetone detecting and administrating field.展开更多
In recent years, clinical studies have found that acetone concentration in exhaled breath can be taken as a characteristic marker of diabetes. Metal-oxide-semiconductor (MOS) materials are widely used in acetone gas s...In recent years, clinical studies have found that acetone concentration in exhaled breath can be taken as a characteristic marker of diabetes. Metal-oxide-semiconductor (MOS) materials are widely used in acetone gas sensors due to their low cost, high sensitivity, fast response/recovery time, and easy integration. This paper reviews recent progress in acetone sensors based on MOS materials for diabetes diagnosis. The methods of improving the performance of acetone sensor have been explored for comparison, especially in high humidity conditions. We summarize the current excellent methods of preparations of sensors based on MOSs and hope to provide some help for the progress of acetone sensors in the diagnosis of diabetes.展开更多
La3＋ doped ZnO nano-rods with different doping concentration were prepared via solvothermal method.The doped ZnO nano-rods were characterized by X-ray diffraction（XRD） and scanning electron microscopy（SEM）,respec...La3＋ doped ZnO nano-rods with different doping concentration were prepared via solvothermal method.The doped ZnO nano-rods were characterized by X-ray diffraction（XRD） and scanning electron microscopy（SEM）,respectively.The effect of La3＋ doping on the gas-sensing properties was investigated.The results revealed that the sensor based on 6 mol% La3＋ doped ZnO nano-rods exhibited high response to dilute acetone,and the responses to 0.01×10-6 acetone reached 2.4 when operating at 425 ℃.The response time and the recovery time for 0.01×10-6 acetone were only 16 and 3 s,respectively.展开更多
Zeolitic imidazolate frameworks(ZIFs)are a series of materials composited by metal ions and organic ligands with high specific surface area,which might be great precursors to produce metal oxides by calcination for ga...Zeolitic imidazolate frameworks(ZIFs)are a series of materials composited by metal ions and organic ligands with high specific surface area,which might be great precursors to produce metal oxides by calcination for gas sensor application.However,Zn-ZIF(ZIF-8)is hard to transform as ZnO in air and keeping the unique framework simultaneously.In this work,Fe^(2+)was introduced into the metal node to replace a part of Zn^(2+)ions,and it could be oxidized as Fe^(3+)in the calcination to facilitate the oxidation process of the 2-methylimdazole ligands to give Fe-ZnO complex shell with high specific surface area(108 m~2/g)and abundant oxygen vacancies(48%).The micro electro mechanical systems(MEMS)sensor based on the6%-Fe-ZnO complex shell performed outstanding gas sensing properties to the low-concentration acetone vapor,including high response(ΔR/R_g=11.2 to 5 ppm acetone),superior selectivity(S_(acetone)/S_(ethanol)=5.6)and fast response speed(τ_(res)=2.6 s).This work not only provided the research of an exceptional acetone MEMS sensor,but also induced a strategy to produce metal oxide derived from ZIFs with complex structures for the universal synthesis methodology.展开更多
The exploitation of the highly reliable gassensing device for exhaled acetone detection possesses momentous and capacious development prospects in the field of an early noninvasive diabetes diagnosis.Considering that ...The exploitation of the highly reliable gassensing device for exhaled acetone detection possesses momentous and capacious development prospects in the field of an early noninvasive diabetes diagnosis.Considering that the characteristics of crystal facets will impact the gas-sensitive performance,herein three different resistive gas sensors were successfully developed by utilizing the stable α-Fe_(2)O_(3)with different crystal facets as the sensitive materials.The gas-sensitive performance testing results reveal that the(110)crystal faceted α-Fe_(2)O_(3)sensor exhibits relatively superior comprehensive gas sensitivity toward acetone.Particularly,it is worth mentioning that the sensor demonstrates reliable sensitivity,rapid response(25 s)/recovery(3 s)speed,and strong anti-interference capability in detecting 2×10^(-6)acetone for the concentration threshold of diabetes,even when exposed to prolonged periods in variable environments.Furthermore,by simply validating the feasibility of the exhalation diagnosis using the as-prepared gas sensor,the(110)faceted α-Fe_(2)O_(3)gas sensor can effectively discriminate the states of healthy human exhalation and the simulated diabetic exhalation.Through integrating the experimental and theoretical analyses,the superior acetone-sensitive performance of the(110)facetedα-Fe_(2)O_(3)gas sensor can principally be interpreted in correlation with crystal facet-dependent gas adsorption capacity and defect-forming ability.These results not only imply a tremendous application perspective in monitoring acetone gas at sub-ppm concentration,but also open up an effective throughway to develop reliable gas-sensing devices for early non-invasive diabetes screening.展开更多
Acetone,as widely used reagents in industry and laboratories,are extremely harmful to the human.So the detection of acetone gas concentrations and leaks in special environments at room temperature is essential.Herein,...Acetone,as widely used reagents in industry and laboratories,are extremely harmful to the human.So the detection of acetone gas concentrations and leaks in special environments at room temperature is essential.Herein,the nanocomposite combining SnO-SnO_(2)(p-n junction)and Ti_(3)C_(2)T_(x) MXene was successfully synthesized by a one-step hydrothermal method.Because of the existence of a small amount of oxygen during the hydrothermal conditions,part of the p-type SnO was oxidized to n-type SnO_(2),forming in-situ p-n junctions on the surface of Sn O.The hamburger-like SnO-SnO_(2)/Ti_(3)C_(2)T_(x) sensor exhibited improved acetone gas sensing response of 12.1(R_(g)/R_(a))at room temperature,which were nearly 11 and 4 times higher than those of pristine Ti_(3)C_(2)T_(x) and pristine SnO-SnO_(2),respectively.Moreover,it expressed a short recovery time(9 s)and outstanding reproducibility.Because of the different work functions,the Schottky barrier was formed between the SnO and the Ti_(3)C_(2)T_(x) nanosheets,acting as a hole accumulation layer(HALs)between Ti_(3)C_(2)T_(x) and tin oxides.Herein,the sensing mechanism based on the formation of hetero-junctions and high conductivity of the metallic phase of Ti_(3)C_(2)T_(x) MXene in SnO-SnO_(2)/Ti_(3)C_(2)T_(x) sensors was discussed in detail.展开更多
Acetone is an important industrial raw material as well as biomarker in medical diagnosis.The detection of acetone has great significance for safety and health.However,high selectivity and low concentration(ppb level)...Acetone is an important industrial raw material as well as biomarker in medical diagnosis.The detection of acetone has great significance for safety and health.However,high selectivity and low concentration(ppb level)detection remain challenges for semiconductor gas sensor.Herein,we present a novel sensitive material with bimetallic PtCu nanocrystal modified on WO3·H2O hollow spheres(HS),which shows high sensitivity,excellent selectivity,fast response/recovery speed and low limit of detection(LOD)to acetone detection.Noteworthy,the response(Ra/Rg)of WO3·H2O HS sensor increased by 9.5 times after modification with 0.02%bimetallic PtCu nanocrystals.The response of PtCu/WO3·H2O HS to 50 ppm acetone is as high as 204.9 with short response/recovery times(3.4 s/7.5 s).Finally,the gassensitivity mechanism was discussed based on gas sensitivity test results.This research will offer a new route for high efficient acetone detection.展开更多
In the present work, we synthesized Sm2O3 doped SnO2 in order to prepare a selective acetone sensor with fast response, quick recovery and good repeatability. Pure as well as 2 mol.%, 4 mol.%, 6 mol.% and 8 mol.% Sm2O...In the present work, we synthesized Sm2O3 doped SnO2 in order to prepare a selective acetone sensor with fast response, quick recovery and good repeatability. Pure as well as 2 mol.%, 4 mol.%, 6 mol.% and 8 mol.% Sm2O3 doped SnO2 nanostructured samples were synthesized by using a co-precipitation method. The characterization of the samples was done by thermogravimetric and differential thermo-gravimetric analysis（TG-DTA）, X-ray diffraction（XRD）, field emission gun-scanning electron microscopy（FEG-SEM）, energy dispersive analysis by X-rays（EDAX）, high resolution scanning electron microscopy（HR-TEM）, selected area X-ray diffraction（SAED）, Brunauer-Emmet-Teller（BET） and ultraviolet-visible-near infrared（UV-Vis-NIR） spectroscopy techniques. The gas response studies of liquid petroleum gas, ammonia, ethanol and acetone vapor were carried out. The results showed that Sm doping systematically lowered operating temperature and enhanced the gas response and selectivity for acetone. The response and recovery time for 6 mol.% Sm2O3 doped SnO2 thick film at the operating temperature of 250 °C were 15 and 24 s, respectively.展开更多
The modulation of the electronic structure of metal oxides is crucial to enhance their gas-sensing performance.However,there is lacking in profound study on the effect of electronic structure regulation on sensing per...The modulation of the electronic structure of metal oxides is crucial to enhance their gas-sensing performance.However,there is lacking in profound study on the effect of electronic structure regulation on sensing performance.Herein,we propose an innovative strategy of Jahn-Teller distortion-induced electronic configuration regulation of Co_(3)O_(4)to improve acetone sensing performance.After the introduction of Mn^(3+)into Co_(3)O_(4)(Mn-Co_(3)O_(4)),the Jahn-Teller distortion of high-spin Mn^(3+)(t_(2g)^(3)e_(g)^(1))conversed to low-spin Mn^(4+)(t_(2g)^(3)e_(g)^(0)),resulting in conversion of Co^(3+)(t_(2g)^(6)e_(g)^(0))into Co^(2+)(t_(2g)^(6)e_(g)^(1)).As expected,Mn-Co_(3)O_(4)exhibits a high response value of 46.7 toward 100 ppm acetone,low limit of detection of 0.75 ppb,high selectivity,and high stability,which are overwhelmingly superior to previous Co_(3)O_(4)-based acetone sensors.The dynamics and thermodynamics analysis demonstrate that the Mn doping improves sensing reaction rate,reduces reaction barrier,and promotes the charge transfer.The theoretical calculations further prove the charge transfer from Mn to Co derived from Jahn-Teller distortion and support promoting the adsorption of acetone on Co_(3)O_(4)by Mn dopant.Moreover,we demonstrated the substantial potential application of Mn-Co_(3)O_(4)sensor as a monitoring gas sensor in pest resistance of Arabidopsis.This work provides a new strategy to design sensing materials from electronic configuration perspective.展开更多
Acetone detection is crucial for diagnosing diseases such as diabetes and lung cancer.Therefore,it is essential to design a room-temperature acetone gas sensor with fast response and recovery times,high sensitivity,hi...Acetone detection is crucial for diagnosing diseases such as diabetes and lung cancer.Therefore,it is essential to design a room-temperature acetone gas sensor with fast response and recovery times,high sensitivity,high selectivity,and a low detection limit.However,current acetone gas sensors face challenges in achieving high-selectivity detection at room tempera-ture.This study primarily utilizes self-assembled organic monolayer functionalized MIL-88B to prepare selectivity acetone sensors.The results show that the detection sensitivity of the improved sensor to acetone is significantly improved.Com-pared with the MIL-88B sensor(0.1 ppm),the response value of the MIL-88B@3-aminopropyltrimethoxysilane(APTMS)sensor is increased by about 61.9%.The response to 10 ppm acetone is 83,and the selectivity is greatly improved at room temperature.This can be attributed to the chemical interactions between acetone molecules and APTMS on the sensor sur-face,which improves the sensor's specific recognition ability for acetone.Additionally,the sensor exhibits better stability and shorter response and recovery times.Consequently,the APTMS functionalization of MIL-88B presents an effective method for preparing room-temperature acetone sensors,combining high sensitivity and selectivity,and offering potential for non-invasive disease diagnosis.展开更多
基金Project(2023JJ10005)supported by the Natural Science Foundation of Hunan Province,ChinaProjects(51772082,51804106)supported by the National Natural Science Foundation of China。
文摘In practical applications,noble metal doping is often used to prepare high performance gas sensors,but more noble metal doping will lead to higher preparation costs.In this study,CeO_(2)/ZnO-Pd with low palladium content was prepared by ultrasonic method with fast response and high selectivity for acetone sensing.With the same amount of palladium added,the selectivity coefficient of CeO_(2)/ZnO-Pd is 1.88 times higher than that of the stirred sensor.Compared with the pure PdO-doped CeO_(2)/ZnO-PdO material,the content of Pd in CeO_(2)/ZnO-PdO is about 30%of that in CeO_(2)/ZnO-PdO,but the selectivity coefficient for acetone is 2.56 times higher.The CeO_(2)/ZnO-Pd sensor has a higher response(22.54)to 50×10^(−6) acetone at 300℃and the selectivity coefficient is 2.57 times that of the CeO_(2)/ZnO sensor.The sensor has a sub-second response time(0.6 s)and still has a 2.36 response to 330×10^(−9) of acetone.Ultrasonic doping makes Pd particles smaller and increases the contact area with gas.Meanwhile,the composition of n-p-n heterojunction and the synergistic effect of Pd/PdO improve the sensor performance.It shows that ultrasonic Pd doping provides a way to improve the utilization rate of doped metals and prepare highly selective gas sensors.
基金Project(30916014103) supported by the Fundamental Research Funds for the Central Universities,China
文摘Ternary Au/Fe2O3-ZnO gas-sensing materials were synthesized by combining co-precipitation and microwave irradiation process.The as-prepared Au/Fe2O3-ZnO was characterized with X-ray diffractometer and scanning electron microscope,and its gas-sensing performance was measured using a gas-sensor analysis system.The results show that the as-prepared products consist of hexagonal wurtzite ZnO,face-centered cubic gold nanoparticles and orthorhombic Fe2O3crystallines.The Au/Fe2O3-ZnO based sensor has a very high selectivity to ethanol and acetone,and also has high sensitivity(154)at a low working temperature(270°C)and an extremely fast response(1s)against acetone.It is found that the selectivity can be adjusted by Fe2O3content added in the ternary materials.It possesses a worth looking forward prospect to practical applications in acetone detecting and administrating field.
文摘In recent years, clinical studies have found that acetone concentration in exhaled breath can be taken as a characteristic marker of diabetes. Metal-oxide-semiconductor (MOS) materials are widely used in acetone gas sensors due to their low cost, high sensitivity, fast response/recovery time, and easy integration. This paper reviews recent progress in acetone sensors based on MOS materials for diabetes diagnosis. The methods of improving the performance of acetone sensor have been explored for comparison, especially in high humidity conditions. We summarize the current excellent methods of preparations of sensors based on MOSs and hope to provide some help for the progress of acetone sensors in the diagnosis of diabetes.
基金supported by the project (No.KJ2009A098) sponsored by Education Department of Anhui Provincethe National Natural Science Foundation of China (No. 50975002)
文摘La3＋ doped ZnO nano-rods with different doping concentration were prepared via solvothermal method.The doped ZnO nano-rods were characterized by X-ray diffraction（XRD） and scanning electron microscopy（SEM）,respectively.The effect of La3＋ doping on the gas-sensing properties was investigated.The results revealed that the sensor based on 6 mol% La3＋ doped ZnO nano-rods exhibited high response to dilute acetone,and the responses to 0.01×10-6 acetone reached 2.4 when operating at 425 ℃.The response time and the recovery time for 0.01×10-6 acetone were only 16 and 3 s,respectively.
基金supported by the National Natural Science Foundation of China(No.62271299)Shanghai Engineering Research Center for Integrated Circuits and Advanced Display Materials。
文摘Zeolitic imidazolate frameworks(ZIFs)are a series of materials composited by metal ions and organic ligands with high specific surface area,which might be great precursors to produce metal oxides by calcination for gas sensor application.However,Zn-ZIF(ZIF-8)is hard to transform as ZnO in air and keeping the unique framework simultaneously.In this work,Fe^(2+)was introduced into the metal node to replace a part of Zn^(2+)ions,and it could be oxidized as Fe^(3+)in the calcination to facilitate the oxidation process of the 2-methylimdazole ligands to give Fe-ZnO complex shell with high specific surface area(108 m~2/g)and abundant oxygen vacancies(48%).The micro electro mechanical systems(MEMS)sensor based on the6%-Fe-ZnO complex shell performed outstanding gas sensing properties to the low-concentration acetone vapor,including high response(ΔR/R_g=11.2 to 5 ppm acetone),superior selectivity(S_(acetone)/S_(ethanol)=5.6)and fast response speed(τ_(res)=2.6 s).This work not only provided the research of an exceptional acetone MEMS sensor,but also induced a strategy to produce metal oxide derived from ZIFs with complex structures for the universal synthesis methodology.
基金financially supported by the National Natural Science Foundation of China(Nos.62101477,62071410 and 21802114)the Science and Technology Innovation Program of Hunan Province(No.2023RC3133)the Excellent Youth Scholars of Hunan Provincial Department of Education(No.21B0141)。
文摘The exploitation of the highly reliable gassensing device for exhaled acetone detection possesses momentous and capacious development prospects in the field of an early noninvasive diabetes diagnosis.Considering that the characteristics of crystal facets will impact the gas-sensitive performance,herein three different resistive gas sensors were successfully developed by utilizing the stable α-Fe_(2)O_(3)with different crystal facets as the sensitive materials.The gas-sensitive performance testing results reveal that the(110)crystal faceted α-Fe_(2)O_(3)sensor exhibits relatively superior comprehensive gas sensitivity toward acetone.Particularly,it is worth mentioning that the sensor demonstrates reliable sensitivity,rapid response(25 s)/recovery(3 s)speed,and strong anti-interference capability in detecting 2×10^(-6)acetone for the concentration threshold of diabetes,even when exposed to prolonged periods in variable environments.Furthermore,by simply validating the feasibility of the exhalation diagnosis using the as-prepared gas sensor,the(110)faceted α-Fe_(2)O_(3)gas sensor can effectively discriminate the states of healthy human exhalation and the simulated diabetic exhalation.Through integrating the experimental and theoretical analyses,the superior acetone-sensitive performance of the(110)facetedα-Fe_(2)O_(3)gas sensor can principally be interpreted in correlation with crystal facet-dependent gas adsorption capacity and defect-forming ability.These results not only imply a tremendous application perspective in monitoring acetone gas at sub-ppm concentration,but also open up an effective throughway to develop reliable gas-sensing devices for early non-invasive diabetes screening.
基金supported financially by the National Natural Science Foundation of China(Nos.,51572158 and 51972200)the Graduate Innovation Fund of Shaanxi University of Science&Technology+2 种基金funded by the Japan Society for the Promotion of Science(JSPS)Grant-in-Aid for the Scientific Research(KAKENHI Nos.20H00297 and Innovative Area“Mixed Anion”(No.16H06439))the Nippon Sheet Glass Foundation for Materials Science and Engineeringby the Dynamic Alliance for Open Innovations Bridging Human,Environment and Materials,the Cooperative Research Program of“Network Joint Research Center for Materials and Devices”。
文摘Acetone,as widely used reagents in industry and laboratories,are extremely harmful to the human.So the detection of acetone gas concentrations and leaks in special environments at room temperature is essential.Herein,the nanocomposite combining SnO-SnO_(2)(p-n junction)and Ti_(3)C_(2)T_(x) MXene was successfully synthesized by a one-step hydrothermal method.Because of the existence of a small amount of oxygen during the hydrothermal conditions,part of the p-type SnO was oxidized to n-type SnO_(2),forming in-situ p-n junctions on the surface of Sn O.The hamburger-like SnO-SnO_(2)/Ti_(3)C_(2)T_(x) sensor exhibited improved acetone gas sensing response of 12.1(R_(g)/R_(a))at room temperature,which were nearly 11 and 4 times higher than those of pristine Ti_(3)C_(2)T_(x) and pristine SnO-SnO_(2),respectively.Moreover,it expressed a short recovery time(9 s)and outstanding reproducibility.Because of the different work functions,the Schottky barrier was formed between the SnO and the Ti_(3)C_(2)T_(x) nanosheets,acting as a hole accumulation layer(HALs)between Ti_(3)C_(2)T_(x) and tin oxides.Herein,the sensing mechanism based on the formation of hetero-junctions and high conductivity of the metallic phase of Ti_(3)C_(2)T_(x) MXene in SnO-SnO_(2)/Ti_(3)C_(2)T_(x) sensors was discussed in detail.
基金the financial supports from the National Natural Science Foundation of China(Nos.51702212,51802195,31701678,61671284)Science and Technology Commission of Shanghai Municipality(Nos.18511110600,19ZR1435200)+1 种基金Innovation Program of Shanghai Municipal Education Commission(No.2019-01-07-00-07-E00015)Program of Shanghai Academic Research Leader(No.19XD1422900)。
文摘Acetone is an important industrial raw material as well as biomarker in medical diagnosis.The detection of acetone has great significance for safety and health.However,high selectivity and low concentration(ppb level)detection remain challenges for semiconductor gas sensor.Herein,we present a novel sensitive material with bimetallic PtCu nanocrystal modified on WO3·H2O hollow spheres(HS),which shows high sensitivity,excellent selectivity,fast response/recovery speed and low limit of detection(LOD)to acetone detection.Noteworthy,the response(Ra/Rg)of WO3·H2O HS sensor increased by 9.5 times after modification with 0.02%bimetallic PtCu nanocrystals.The response of PtCu/WO3·H2O HS to 50 ppm acetone is as high as 204.9 with short response/recovery times(3.4 s/7.5 s).Finally,the gassensitivity mechanism was discussed based on gas sensitivity test results.This research will offer a new route for high efficient acetone detection.
文摘In the present work, we synthesized Sm2O3 doped SnO2 in order to prepare a selective acetone sensor with fast response, quick recovery and good repeatability. Pure as well as 2 mol.%, 4 mol.%, 6 mol.% and 8 mol.% Sm2O3 doped SnO2 nanostructured samples were synthesized by using a co-precipitation method. The characterization of the samples was done by thermogravimetric and differential thermo-gravimetric analysis（TG-DTA）, X-ray diffraction（XRD）, field emission gun-scanning electron microscopy（FEG-SEM）, energy dispersive analysis by X-rays（EDAX）, high resolution scanning electron microscopy（HR-TEM）, selected area X-ray diffraction（SAED）, Brunauer-Emmet-Teller（BET） and ultraviolet-visible-near infrared（UV-Vis-NIR） spectroscopy techniques. The gas response studies of liquid petroleum gas, ammonia, ethanol and acetone vapor were carried out. The results showed that Sm doping systematically lowered operating temperature and enhanced the gas response and selectivity for acetone. The response and recovery time for 6 mol.% Sm2O3 doped SnO2 thick film at the operating temperature of 250 °C were 15 and 24 s, respectively.
基金National Natural Science Foundation of China,Grant/Award Numbers:62071198,62471198,62020106006Jilin Provincial Science&Technology Department,Grant/Award Numbers:20240101376JC,20240101135JCJilin Provincial Education Department,Grant/Award Number:JKH20231168KJ。
文摘The modulation of the electronic structure of metal oxides is crucial to enhance their gas-sensing performance.However,there is lacking in profound study on the effect of electronic structure regulation on sensing performance.Herein,we propose an innovative strategy of Jahn-Teller distortion-induced electronic configuration regulation of Co_(3)O_(4)to improve acetone sensing performance.After the introduction of Mn^(3+)into Co_(3)O_(4)(Mn-Co_(3)O_(4)),the Jahn-Teller distortion of high-spin Mn^(3+)(t_(2g)^(3)e_(g)^(1))conversed to low-spin Mn^(4+)(t_(2g)^(3)e_(g)^(0)),resulting in conversion of Co^(3+)(t_(2g)^(6)e_(g)^(0))into Co^(2+)(t_(2g)^(6)e_(g)^(1)).As expected,Mn-Co_(3)O_(4)exhibits a high response value of 46.7 toward 100 ppm acetone,low limit of detection of 0.75 ppb,high selectivity,and high stability,which are overwhelmingly superior to previous Co_(3)O_(4)-based acetone sensors.The dynamics and thermodynamics analysis demonstrate that the Mn doping improves sensing reaction rate,reduces reaction barrier,and promotes the charge transfer.The theoretical calculations further prove the charge transfer from Mn to Co derived from Jahn-Teller distortion and support promoting the adsorption of acetone on Co_(3)O_(4)by Mn dopant.Moreover,we demonstrated the substantial potential application of Mn-Co_(3)O_(4)sensor as a monitoring gas sensor in pest resistance of Arabidopsis.This work provides a new strategy to design sensing materials from electronic configuration perspective.
基金supported by the National Natural Science Foundation of China(62104063,61974040)the China Postdoctoral Science Foundation(2021M701055,2022T150188)Key Scientific and Technological Project of Henan Provinces(232102221006).
文摘Acetone detection is crucial for diagnosing diseases such as diabetes and lung cancer.Therefore,it is essential to design a room-temperature acetone gas sensor with fast response and recovery times,high sensitivity,high selectivity,and a low detection limit.However,current acetone gas sensors face challenges in achieving high-selectivity detection at room tempera-ture.This study primarily utilizes self-assembled organic monolayer functionalized MIL-88B to prepare selectivity acetone sensors.The results show that the detection sensitivity of the improved sensor to acetone is significantly improved.Com-pared with the MIL-88B sensor(0.1 ppm),the response value of the MIL-88B@3-aminopropyltrimethoxysilane(APTMS)sensor is increased by about 61.9%.The response to 10 ppm acetone is 83,and the selectivity is greatly improved at room temperature.This can be attributed to the chemical interactions between acetone molecules and APTMS on the sensor sur-face,which improves the sensor's specific recognition ability for acetone.Additionally,the sensor exhibits better stability and shorter response and recovery times.Consequently,the APTMS functionalization of MIL-88B presents an effective method for preparing room-temperature acetone sensors,combining high sensitivity and selectivity,and offering potential for non-invasive disease diagnosis.
