Abstract
Formaldehyde is a common atmospheric pol-lutant produced in industrial production and daily life.However,the traditional semiconductor formaldehyde gas sensor cannot work at room temperature,which limits its practical application.Therefore,developing high-perfor-mance gas sensors for rapidly and accurately detecting formaldehyde at room temperature is an important topic.In this study,Ti3C2Tx/SnO2 heterostructures were con-structed,which could selectively detect formaldehyde at room temperature with a response value of 29.16％(10 × 10-6).In addition,the sensor shows a remarkable theoretical detection limit of 5.09 × 10-9 and good long-term stability.Density functional theory(DFT)simulations reveal that SnO2 nanospheres provide the majority of adsorption sites that strongly interact with formaldehyde.Meanwhile,Ti3C2Tx acting as a conductive layer facilitates the transfer of charge carriers so that they show a sensing response to formaldehyde at room temperature.Moreover,the formation of p-n heterostructures between SnO2 and Ti3C2Tx boosts the Schottky barrier at the interface,which is the critical factor in enhancing the sensing properties by turning the Schottky barrier upon introducing formalde-hyde gas.This perspective is expected to provide instruc-tive guidance for utilizing MXene/metal oxide nanocomposites to improve the gas sensing performance at room temperature.
基金项目
National Natural Science Foundation of China(61973223)
Innovative Talents in Colleges and Universities in Liaoning Province(2020389)
Liao Ning Revitalization Talents Program(XLYC2007051)
Liaoning Educational Department Foundation(LJKMZ20220762)
Natural Science Foundation of Liaoning Province(2021-MS-257)
Young and Middleaged Scientific and Technological Innovation Talents of Shenyang Science and Technology Bureau(RC200352)
NETL
NSTL
万方数据