基于镍铟水滑石的含异质结材料在甲苯检测中的应用  

Application of heterojunctioned materials based on NiIn-LDHs for toluene detection

作　　者：聂林峰 韩宁[1,3] 陈运法 Linfeng NIE;Ning HAN;Yunfa CHEN(State Key Laboratory of Multiphase Complex Systems,Institute of Process Engineering,Chinese Academy of Sciences,Beijing 100190,China;College of Chemical Engineering,University of Chinese Academy of Sciences,Beijing 100049,China;Center for Excellence in Regional Atmospheric Environment,Institute of Urban Environment,Chinese Academy of Sciences,Xiamen,Fujian 361021,China)

机构地区：[1]中国科学院过程工程研究所多相复杂系统国家重点实验室,北京100190 [2]中国科学院大学化学工程学院,北京100049 [3]中国科学院城市环境研究所区域大气环境研究卓越创新中心,福建厦门361021

出　　处：《过程工程学报》2022年第4期515-522,共8页The Chinese Journal of Process Engineering

基　　金：国家重点研发计划(编号:2016YFC0207100)。

摘　　要：构建异质结构是提高气体传感器性能的有效方法之一。本工作通过在空气中高温煅烧不同Ni/In摩尔比的镍铟水滑石(NiIn-LDHs)合成了一系列含NiO-In_(2)O_(3)异质结的材料,通过氢气退火处理后,应用于甲苯气体检测。结果表明,当Ni/In为3.0,退火温度为500℃时,所得材料对0.005‰甲苯具有最高响应。此外,该材料还表现出针对其他干扰气体(如氨气、丙酮、高湿度水汽、三乙胺和二氧化硫)的高选择性和12天的连续测试的高稳定性。通过XPS、UPS等一系列表征证实,退火后形成的材料Ni/NiO-In_(2)O_(3)中存在肖特基能垒以及较多的氧空位,与P-N结的协同效应共同导致了其具有最佳气敏性能。Nowadays,people have paid more and more attention to air pollution which urging researchers to explore different high-performance gas sensors for air quality monitoring.As a representative of air pollution,volatile organic compounds(VOCs)have been studied a lot.Plenty of work about VOCs gas sensors and how to enhance gas sensing performance has been reported.Constructing a heterojunction structure in gas sensor material was considered to be one of the effective methods to improve the performance of gas sensors.In this work,a series of nickel-indium layered double hydroxides(NiIn-LDHs)precursors with different Ni/In atonic molar ratios were synthesized successfully via chemical precipitation methods.And a series of NiO-In_(2)O_(3) P-N heterojunctioned materials were fabricated by calcining these NiIn-LDHs precursors in the air at high-temperature.Following with an annealing step at H_(2) atmosphere at different temperatures,these heterojunctioned materials can be used as gas sensing materials to detect low concentration toluene gas.The influence of Ni/In atomic molar ratios and annealing temperatures on gas sensing performance were studied.The results showed that when Ni/In atomic molar ratio was 3.0 and annealing temperature was 500℃,the obtained material showed the highest response to 0.005‰toluene.In addition,the material also showed high selectivity to other interfering gases(such as 0.005‰ammonia,acetone,triethylamine,sulfur dioxide,and high-humidity water vapor),and it had shown good stability in a 12-day-testing.A series of characterizations such as XPS,UPS,etc.confirmed that the material Ni/NiO-In_(2)O_(3) which formed after annealing at 500℃owns Schottky barrier and abundant oxygen vacancies.The synergistic effect of P-N junction,Schottky barrier and abundant oxygen vacancies lead to the best sensing performance.This work can provide ideas for the development of high-performance toluene gas sensors.

关 键 词：水滑石 异质结 气体传感器 甲苯 

分 类 号：X831[环境科学与工程—环境工程] TB34[一般工业技术—材料科学与工程]