二维过渡金属硫族化合物纳米异质结气体传感器研究进展  

Gas sensors based on two-dimensional transition metal dichalcogenide nanoheterojunctions

作　　者：杨志 李泊龙 韩雨彤 苏晨 陈辛未 周志华 苏言杰 胡南滔 张亚非 曾敏 Zhi Yang;Bolong Li;Yutong Han;Chen Su;Xinwei Chen;Zhihua Zhou;Yanjie Su;Nantao Hu;Yafei Zhang;Min Zeng(Key Laboratory of Thin Film and Microfabrication(Ministry of Education),Department of Micro/Nano Electronics,School of Electronic Information and Electrical Engineering,Shanghai Jiao Tong University,Shanghai 200240,China)

机构地区：[1]上海交通大学电子信息与电气工程学院微纳电子学系薄膜与微细技术教育部重点实验室

出　　处：《科学通报》2019年第35期3699-3716,共18页Chinese Science Bulletin

基　　金：国家自然科学基金(61971284,61671299)资助

摘　　要：二维过渡金属硫族化合物(2D TMDs)在气体传感方向的应用中具有显著的"先天"优势,表现出如灵敏度高、响应速度快、能耗低以及能在室温下工作等诸多优点.相对单一的2D TMDs而言,基于2D TMDs纳米异质结的气体传感器展现出更加优越的气体传感性能.本文将系统总结2D TMDs纳米异质结气体传感器的研究进展,尤其是2D TMDs与金属氧化物、金属硫化物、碳基纳米材料以及量子点之间形成的纳米异质结设计、构效关系以及传感机理等关键科学问题.传感材料和传感机制上的创新对提升传感性能并拓展传感功能具有重要的科学意义.通过对纳米异质结气敏机理的深入探究,有望实现纳米异质结结构的人为设计和可控制备,提高室温下对目标气体的高灵敏选择性识别和检测.在纳米异质结的结构设计上,以TMDs材料为导电主体,在其表面生长各种纳米结构,通过对纳米异质结表面酸碱性、功函数、气体分子极性以及纳米异质结与气体分子之间的氧化还原反应性质进行调控,来构筑基于TMDs的纳米异质结.此外,控制负载在二维TMDs上纳米颗粒尺寸小于两倍电子耗尽层厚度,充分发挥纳米颗粒量子限域效应,以纳米颗粒充当传感的"天线分子"或"探针分子",实现对目标气体分子的高灵敏选择性识别和检测.Two-dimensional transition metal chalcogenides(2D TMDs)have a significant"innate"advantage in gas sensing applications,showing many advantages such as high sensitivity,fast response,low energy consumption and ability to work at room temperature.Compared to the single 2D TMDs,gas sensor based on 2D TMD heterojunctions exhibit superior gas sensing performance.Here,we will systematically summarize the research progress of 2D TMD heterojunction gas sensor,especially the key scientific questions such as structure design,structure-activity relationships and sensing mechanisms for nano-heterojunction based on 2D TMDs and metal oxide,metal sulfides,carbon nanomaterials and quantum dots.Innovations in sensing materials and sensing mechanisms have a significant scientific impact on improving sensing performance and extending sensing multi-functions.Through the further study of the gas sensing mechanisms based on nano-heterojunction,we seek to realize the artificial design and controllable preparation of nanoheterojunctions,and improve the high sensitivity and selective identification and detection of the target gas at room temperature.In the design of nano-heterojunction structure,2D TMDs are used as conductive subject material to grow various nanostructures on the surface.Considering the acid-basic property of nano-heterojunctions,work function,the polarity of the target gas molecules,and the redox reaction between the heterojunctions and gas molecules,we choose moderate object nanomaterials to construct nano-heterojunctions based on 2D TMDs.We control the size of nanomaterials less than twice the size of the electron depletion layer,and the quantum confinement effect of the nanoparticles is fully utilized.Here the nanoparticles act as the"antenna molecule"or"probe molecule"of the sensing.Nano-heterojunctions based on 2D TMDs were designed to obtain highly sensitive selective identification and detection for target gas molecules.

关 键 词：气体传感器 过渡金属硫族化合物 纳米异质结 二维层状材料 传感机理 

分 类 号：TB3[一般工业技术—材料科学与工程]