MXene-derived TiO_(2)nanosheets decorated with Ag nanoparticles for highly sensitive detection of ammonia at room temperature  

作　　者：Jie Wen Zihao Song Jiabao Ding Feihong Wang Hongpeng Li Jinyong Xu Chao Zhang 

机构地区：[1]College of Mechanical Engineering,Yangzhou University,Yangzhou 225127,China [2]School of Environmental Science and Engineering,Yancheng Institute of Technology,Yancheng 224051,China

出　　处：《Journal of Materials Science & Technology》2022年第19期233-239,共7页材料科学技术（英文版）

基　　金：supported by the National Natural Science Foundation of China (No. 52103308);the Postgraduate Research & Practice Innovation Program of Jiangsu Province (No. SJCX21_1555);the Natural Science Foundation of Jiangsu Province (No. BK20210826)

摘　　要：Due to their large surface-to-volume ratio and low electronic noise,two-dimensional transition metal carbides(Ti_(3)C_(2)T_(x) MXene)and their derived transition metal oxides have demonstrated significant potential for use in high-precision gas sensing.However,the construction of high-sensitivity Ti_(3)C_(2)T_(x) MXene-based gas sensors operated at room temperature(RT)is still a major challenge.Herein,we demonstrate a sensitive nanocomposite prepared by uniformly anchoring silver nanoparticles(AgNPs)on Ti_(3)C_(2)T_(x) MXene-derived transition metal oxide(TiO_(2))nanosheets for high-sensitivity NH_(3) detection.AgNPs can not only serve as spacers to effectively prevent the restacking of MXene-derived TiO_(2)nanosheets and ensure an effective transmission highway for target gas molecules,but also enhance the sensitivity of the sensor through chemical and electronic sensitization.By integrating the unique merits of the individual components and the synergistic effects of the composites,the optimized Ag@TiO_(2)nanocomposite-based sensors revealed an extraordinary response value of 71.8 to 50 ppm NH_(3) at RT with a detection limit as low as 5 ppm.In addition,the Ag@TiO_(2)NH_(3) sensor also exhibits excellent selectivity and outstanding repeatability.This strategy provides an avenue for the development of MXene derivatives for advanced gas sensors.

关 键 词：Ti_(3)C_(2)T x MXene derivative TiO_(2) Ag nanoparticles Gas sensor 

分 类 号：TB383.1[一般工业技术—材料科学与工程] TP212[自动化与计算机技术—检测技术与自动化装置]