Air-stable,all-dry transferred ReS_(2)/GaSe heterostructure-based NO_(2)gas sensor  

作　　者：A.Venkatesan Hyeyoon Ryu Anupom Devnath Hyungyu Yoo Seunghyun Lee 

机构地区：[1]Department of Electronic Engineering,Kyung Hee University,Yongin-Si 17104,South Korea [2]Department of Electronics and Information Convergence Engineering,Kyung Hee University,Yongin-Si 17104,South Korea

出　　处：《Journal of Materials Science & Technology》2024年第1期79-87,共9页材料科学技术（英文版）

基　　金：supported by the Basic Science Research Program through the National Research Foundation of Korea(NRF)(No.2018R1A6A1A03025708);supported by the Nano-Material Technology Development Program through the National Research Foundation of Korea(NRF),funded by the Ministry of Science,ICT and Future Planning(No.2009-0082580).

摘　　要：Two-dimensional(2D)materials have gained considerable attention in chemical sensing owing to their naturally high surface-to-volume ratio.However,the poor response time and incomplete recovery re-strict their application in practical,high performance gas sensors.In this work,we fabricated air-stable ReS_(2)/GaSe heterostructure-based NO_(2)gas sensors with excellent gas sensing response,recovery,selectiv-ity and a low limit of detection(LOD)toward nitrogen dioxide(NO_(2)).The ReS_(2)/GaSe heterostructure was prepared via mechanical exfoliation and an all-dry transfer method.Before the sensing measurements,temperature-dependant transport measurements were carried out.The Schottky Barrier Height(SBH)of the ReS_(2)/GaSe heterostructure was calculated and the corresponding transport mechanisms were dis-cussed.The fabricated gas sensors showed a significant response enhancement with full reversibility to-ward ppm-level NO_(2)(response of∼17%at 3 ppm,a LOD of∼556 ppb)at an operating temperature of(33°C).In particular,the total response and recovery time of the ReS_(2)/GaSe was revealed to be less than 4 min(∼38 s and∼174 s,respectively)for the 250 ppm concentration,which is one of the best response and recovery time toward ppm-level NO_(2).The excellent sensing performances and recovery characteris-tics of the ReS_(2)/GaSe structure are attributed to its efficient charge separation,unique interlayer coupling and desirable band alignments.This atomically thin,ultrasensitive gas sensor that operates at room tem-perature is a strong technological contender to conventional metal oxide gas sensors,which often require elevated temperatures.

关 键 词：2D materials All-dry transfer Gas sensor Van der Waals heterostructure ReS_(2)/GaSe Gas sensing response Transition metal dichalcogenide 

分 类 号：TP2[自动化与计算机技术—检测技术与自动化装置]