Two dimensional(2D)materials are promising gas sensing materials,but the most of them need to be heated to show promising sensing performance.Sensing structures with high sensing performance at room-temperature are ur...Two dimensional(2D)materials are promising gas sensing materials,but the most of them need to be heated to show promising sensing performance.Sensing structures with high sensing performance at room-temperature are urgent.Here,another 2D material,violet phosphorus(VP)nanoflake is investigated as gas sensing material.The VP nanoflakes have been effectively ablated to have layers of 1–5 layers by laser ablation in glycol.The VP nanoflakes are combined with graphene to form VP/G heterostructuresbased NO sensor.An ultra-high gauge factor of 3×10^(7)for ppb-level sensing and high resistance response of 59.21%with ultra-short recovery time of 6s for ppm-level sensing have been obtained.The sensing mechanism is also analysed by density functional theory(DFT)calculations.The adsorption energy of VP/G is calculated to be-0.788 e V,resulting in electrons migration from P to N to form a P-N bond in the gap between VP and graphene sheet.This work provides a facile approach to ablate VP for mass production.The as-produced structures have also provided potential gas sensors with ultrasensitive performance as ppb-level room-temperature sensors.展开更多
A highly selective nitric oxide（NO） sensor is fabricated and applied to devise an enhanced flow injection analysis（FIA） system for S-nitrosothiols（RSNOs） measurement in biological samples.The NO sensor is prepar...A highly selective nitric oxide（NO） sensor is fabricated and applied to devise an enhanced flow injection analysis（FIA） system for S-nitrosothiols（RSNOs） measurement in biological samples.The NO sensor is prepared using a polytetrafluoroethylene（PTFE） gas-permeable membrane loaded with Teflon AF？ solution,a copolymer of tetrafluoroethylene and 2,2-bis（trifluoroethylene）-4,5-difluoro -l,3-dioxole,to improve selectivity.This method is much simpler and possesses good performance over a wide range of RSNOs concentrations.Standard deviation for three parallel measurements of blood plasma is 4.0%.The use of the gas sensing configuration as the detector enhances selectivity of the FIA measurement vs.using less selective electrochemical detectors that do not use PTFE/Teflon type outer membranes.展开更多
The surficial inherent properties of TiO_(2)like exposed facet and crystalline state are vital for their surface reactions.However,efficiently controlling the specific crystal structure and the exposed crystal surface...The surficial inherent properties of TiO_(2)like exposed facet and crystalline state are vital for their surface reactions.However,efficiently controlling the specific crystal structure and the exposed crystal surface still faces big challenge.Here,the controlled solid phase transition of amorphous TiO_(2)to crystalline phase with exposed crystal facet(001)is achieved by photo-assisted atomic layer deposition(ALD)Pt process.Significantly,the obtained Pt/TiO_(2)film via photo-assisted treatment exhibits high sensing performance to NO and HF,and shows a lower optimized working temperature.The enhanced sensing performance is attributed to the metal-support strong interaction under oxidative atmosphere(O-SMSI).The facet effects leading to the unique distribution of charges at the interface combined with the catalytic effects result in the high sensing performance.This work provides a novel phase transition engineering strategy for regulating TiO_(2)from amorphous to crystalline phase,and the controllable synthesis of high Pt monatomic loading on TiO_(2)via ALD,which are critical for the accurate synthesis of efficient sensing and catalytic nanomaterials.展开更多
基金the funding support by National Natural Science Foundation of China(Nos.61705125,22175136)Open Foundation of State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures,Guangxi University(No.2022GXYSOF15)。
文摘Two dimensional(2D)materials are promising gas sensing materials,but the most of them need to be heated to show promising sensing performance.Sensing structures with high sensing performance at room-temperature are urgent.Here,another 2D material,violet phosphorus(VP)nanoflake is investigated as gas sensing material.The VP nanoflakes have been effectively ablated to have layers of 1–5 layers by laser ablation in glycol.The VP nanoflakes are combined with graphene to form VP/G heterostructuresbased NO sensor.An ultra-high gauge factor of 3×10^(7)for ppb-level sensing and high resistance response of 59.21%with ultra-short recovery time of 6s for ppm-level sensing have been obtained.The sensing mechanism is also analysed by density functional theory(DFT)calculations.The adsorption energy of VP/G is calculated to be-0.788 e V,resulting in electrons migration from P to N to form a P-N bond in the gap between VP and graphene sheet.This work provides a facile approach to ablate VP for mass production.The as-produced structures have also provided potential gas sensors with ultrasensitive performance as ppb-level room-temperature sensors.
基金the Project of Base for Introducing Talents of Discipline to Universities(111 project,NoB07012)National Scholarship Fund of the China Scholarship Council for supporting visiting students in foreign universities
文摘A highly selective nitric oxide（NO） sensor is fabricated and applied to devise an enhanced flow injection analysis（FIA） system for S-nitrosothiols（RSNOs） measurement in biological samples.The NO sensor is prepared using a polytetrafluoroethylene（PTFE） gas-permeable membrane loaded with Teflon AF？ solution,a copolymer of tetrafluoroethylene and 2,2-bis（trifluoroethylene）-4,5-difluoro -l,3-dioxole,to improve selectivity.This method is much simpler and possesses good performance over a wide range of RSNOs concentrations.Standard deviation for three parallel measurements of blood plasma is 4.0%.The use of the gas sensing configuration as the detector enhances selectivity of the FIA measurement vs.using less selective electrochemical detectors that do not use PTFE/Teflon type outer membranes.
基金financial support from National Key R&D Program of China(No.2022YFC3320700)National Natural Science Foundation of China(Nos.62271299 and 22302118)China Postdoctoral Science Foundation(No.2022M712019)。
文摘The surficial inherent properties of TiO_(2)like exposed facet and crystalline state are vital for their surface reactions.However,efficiently controlling the specific crystal structure and the exposed crystal surface still faces big challenge.Here,the controlled solid phase transition of amorphous TiO_(2)to crystalline phase with exposed crystal facet(001)is achieved by photo-assisted atomic layer deposition(ALD)Pt process.Significantly,the obtained Pt/TiO_(2)film via photo-assisted treatment exhibits high sensing performance to NO and HF,and shows a lower optimized working temperature.The enhanced sensing performance is attributed to the metal-support strong interaction under oxidative atmosphere(O-SMSI).The facet effects leading to the unique distribution of charges at the interface combined with the catalytic effects result in the high sensing performance.This work provides a novel phase transition engineering strategy for regulating TiO_(2)from amorphous to crystalline phase,and the controllable synthesis of high Pt monatomic loading on TiO_(2)via ALD,which are critical for the accurate synthesis of efficient sensing and catalytic nanomaterials.
