This study develops a flexible strain sensor with electromagnetic interference(EMI)shielding,hydrophobicity,and acid/alkali resistance by integrating a bi-ordered porous structure with a micro-raised surface.The struc...This study develops a flexible strain sensor with electromagnetic interference(EMI)shielding,hydrophobicity,and acid/alkali resistance by integrating a bi-ordered porous structure with a micro-raised surface.The structure,mimicking lotus leaves,is fabricated using magnetic field-assisted freezing orientation and laser ablation on graphene(Gr)/Fe nanowire(NW)-infused aerogel and polydimethylsiloxane.The sensor,with a Gr to Fe NW ratio of 9:1,shows a high gauge factor of 85.19 in the 0–30%tensile strain.These values are 304%,430%,702%,and 1226%of the samples with Gr to Fe NWs ratios of 7:1,5:1,3:1,and 1:1,respectively.It achieves an EMI shielding efficiency(SE)of 20.02 dB and a specific SE of 807.48 dB cm^(2)/g in the 8.2–12.4 GHz range,150%higher than isotropic samples.The sensor exhibits a contact angle of 155.76°,maintaining hydrophobic stability under stretching and showing excellent resistance to acid and alkali.Additionally,the sensor can be integrated into wearable devices like gloves for gesture recognition,machine hand manipulation,and controlling neon bulbs,demonstrating potential for applications in field robotics and human-robot interaction.展开更多
Online detection of insulation defects the decomposition products of SF_(6)plays a key role in ensuring the safe operation of the gas-insulated switchgear(GIS)equipment.The pristine TiO_(2)(101)modified by Ni cluster(...Online detection of insulation defects the decomposition products of SF_(6)plays a key role in ensuring the safe operation of the gas-insulated switchgear(GIS)equipment.The pristine TiO_(2)(101)modified by Ni cluster(1-3 Ni atoms)is used as a new gas-sensing material to study its gas-sensing characteristics to the characteristic decomposition products of SF_(6):SO2,SOF2,and SO2F2.Through density functional theory(DFT)calculation,we found that the modification of Ni clusters significantly improved the conductivity of pristine TiO_(2)(101)and the gas sensitivity of SF_(6)decomposition products.More importantly,the change of conductivity after gas adsorption lays a theoretical foundation for identifying the type and concentration of SF_(6)characteristic decomposition products and further judging the type of defects in GIS.展开更多
In the long-running of sulphur hexafluoride(SF_(6))-insulated equipment,SF_(6) inevitably decomposes to various decomposition products under electric discharge,including SOF_(2) and SO2F_(2).In this work,single Pt mod...In the long-running of sulphur hexafluoride(SF_(6))-insulated equipment,SF_(6) inevitably decomposes to various decomposition products under electric discharge,including SOF_(2) and SO2F_(2).In this work,single Pt modified molybdenum disulphide(Pt-MoS_(2))monolayer,and double Pt modified molybdenum disulphide(Pt_(2)-MoS_(2))monolayer are proposed to analyse its adsorption and sensing properties to SOF_(2) and SO2F_(2) with single and double gas molecules adsorption based on density functional theory.The adsorption energy,density of states,and molecular orbit theory are employed to analyse the adsorption and sensing mechanism.It turns out that the Pt-MoS_(2) and Pt_(2)-MoS_(2) present outstanding adsorption capacity to gas molecules.Specifically,double SOF_(2) adsorption on Pt_(2)-MoS_(2) shows the best adsorption performance,and the conductivity of the adsorption system changes the most in the adsorption process.Overall,both Pt-MoS_(2) and Pt_(2)-MoS_(2) perform as an excellent gas sensor.This study provides a theoretical basis to develop Pt-MoS_(2) and Pt_(2)-MoS_(2) based materials for SOF_(2) and SO2F_(2) detection in SF_(6)-insulated equipment.展开更多
基金supported by the Chongqing New Youth Innovation Talent Program(Grant No.CSTB2024NSCQ-QCXMX0086)National Natural Science Foundation of China(Grant No.52205589)+4 种基金Science and Technology Research Program of Chongqing Municipal Education Commission(Grant No.KJZD-K202300606)Natural Science Foundation of Anhui Province(Grant No.2208085QE141)China Postdoctoral Science Foundation(Grant Nos.2023T160765,2022MD713695)Young Elite Scientists Sponsorship Program by CAST(China Association for Science and Technology)(Grant No.2022QNRC001)Hong Kong Scholars Program。
文摘This study develops a flexible strain sensor with electromagnetic interference(EMI)shielding,hydrophobicity,and acid/alkali resistance by integrating a bi-ordered porous structure with a micro-raised surface.The structure,mimicking lotus leaves,is fabricated using magnetic field-assisted freezing orientation and laser ablation on graphene(Gr)/Fe nanowire(NW)-infused aerogel and polydimethylsiloxane.The sensor,with a Gr to Fe NW ratio of 9:1,shows a high gauge factor of 85.19 in the 0–30%tensile strain.These values are 304%,430%,702%,and 1226%of the samples with Gr to Fe NWs ratios of 7:1,5:1,3:1,and 1:1,respectively.It achieves an EMI shielding efficiency(SE)of 20.02 dB and a specific SE of 807.48 dB cm^(2)/g in the 8.2–12.4 GHz range,150%higher than isotropic samples.The sensor exhibits a contact angle of 155.76°,maintaining hydrophobic stability under stretching and showing excellent resistance to acid and alkali.Additionally,the sensor can be integrated into wearable devices like gloves for gesture recognition,machine hand manipulation,and controlling neon bulbs,demonstrating potential for applications in field robotics and human-robot interaction.
基金National Natural Science Foundation of China,Grant/Award Number:51907165Chongqing Higher Education Teaching Reform Research Project,Grant/Award Number:213065Southwest University Students Innovation and Entrepreneurship Training Project,Grant/Award Number:P202110635063。
文摘Online detection of insulation defects the decomposition products of SF_(6)plays a key role in ensuring the safe operation of the gas-insulated switchgear(GIS)equipment.The pristine TiO_(2)(101)modified by Ni cluster(1-3 Ni atoms)is used as a new gas-sensing material to study its gas-sensing characteristics to the characteristic decomposition products of SF_(6):SO2,SOF2,and SO2F2.Through density functional theory(DFT)calculation,we found that the modification of Ni clusters significantly improved the conductivity of pristine TiO_(2)(101)and the gas sensitivity of SF_(6)decomposition products.More importantly,the change of conductivity after gas adsorption lays a theoretical foundation for identifying the type and concentration of SF_(6)characteristic decomposition products and further judging the type of defects in GIS.
基金This work was supported by the National Natural Science Foundation of China(grant no.51907165)Key Laboratory of Industrial Internet of Things&Networked Control(grant no.2018FF04)Chongqing Research Program of Basic Research and Frontier Technology(grant no.cstc2018jcyjAX0068)。
文摘In the long-running of sulphur hexafluoride(SF_(6))-insulated equipment,SF_(6) inevitably decomposes to various decomposition products under electric discharge,including SOF_(2) and SO2F_(2).In this work,single Pt modified molybdenum disulphide(Pt-MoS_(2))monolayer,and double Pt modified molybdenum disulphide(Pt_(2)-MoS_(2))monolayer are proposed to analyse its adsorption and sensing properties to SOF_(2) and SO2F_(2) with single and double gas molecules adsorption based on density functional theory.The adsorption energy,density of states,and molecular orbit theory are employed to analyse the adsorption and sensing mechanism.It turns out that the Pt-MoS_(2) and Pt_(2)-MoS_(2) present outstanding adsorption capacity to gas molecules.Specifically,double SOF_(2) adsorption on Pt_(2)-MoS_(2) shows the best adsorption performance,and the conductivity of the adsorption system changes the most in the adsorption process.Overall,both Pt-MoS_(2) and Pt_(2)-MoS_(2) perform as an excellent gas sensor.This study provides a theoretical basis to develop Pt-MoS_(2) and Pt_(2)-MoS_(2) based materials for SOF_(2) and SO2F_(2) detection in SF_(6)-insulated equipment.
