Single-atom Pd confined in Ti_(3)C_(2) nanosheet for boosted room-temperature trace NO_(2) monitoring  

作　　者：Yang Cai Jinlong Xiong Yuwei Wang Hafiz Muhammad Adeel Sharif Jiahao Cai Ting Pan Xueren Tan Zhuo Li Changping Li 

机构地区：[1]Research Center for Eco-Environmental Engineering,Dongguan University of Technology,Dongguan 523808,China

出　　处：《Nano Research》2025年第4期267-275,共9页纳米研究(英文版)

基　　金：financially supported by Guangdong Basic and Applied Basic Research Foundation(No.2023A1515140020);the National Natural Science Foundation of China(Nos.52070042 and 52300127);Characteristic Innovation Project of Guangdong Universities(No.2024KTSCX213).

摘　　要：Two-dimensional MXenes have great potential for gas sensing applications due to their distinct electronic structure and unique surface properties.However,low sensitivity and poor selectivity to target gas at room temperature are major shortcomings of MXene materials.In this study,PdCl_(2) was used to decorate Pd single atoms(PdSA)on Ti_(3)C_(2) nanosheet(Ti_(3)C_(2)/PdSA).The Pd^(2+)was directly reduced(in-situ)into a PdSA due to abundant Ti vacancies and the inherent reducing ability of Ti_(3)C_(2) MXene.The Ti_(3)C_(2)/PdSA sensor exhibited the highest response of 0.289 to 1 ppm NO_(2),which is 28.9 and 7.8 times higher over pristine Ti_(3)C_(2) and Pd nanoparticles(Pdnano)-decorated on Ti_(3)C_(2)(Ti_(3)C_(2)/Pdnano),respectively.Simultaneously,the Ti_(3)C_(2)/PdSA sensor possessed an ultralow detection limit(10 ppb)and excellent selectivity towards NO_(2).The enhanced gas sensing mechanism of Ti_(3)C_(2)/PdSA was investigated in detail through the activation energy calculation,in-situ diffuse reflectance infrared Fourier transform spectroscopy(DRIFTS),and density functional theory(DFT)studies.The rich active sites,chemical sensitization effect,and NO_(2) adsorption enhancement resulting from the Pd single atoms in Ti_(3)C_(2)/PdSA significantly boosted sensing performance.This work can provide new insights and guidelines for fabricating highly effective NO_(2) sensors operated at room temperature.

关 键 词：NO_(2)sensor Pd single atom Ti_(3)C_(2)MXene sensing mechanism in-situ diffuse reflectance infrared Fourier transform spectroscopy(DRIFTS) 

分 类 号：O469[理学—凝聚态物理]