MXenes公司
纳米颗粒
检出限
贵金属
选择性
甲醛
吸附
材料科学
碳化物
纳米技术
过渡金属
化学工程
金属
化学
催化作用
色谱法
有机化学
冶金
复合材料
工程类
作者
Winston Yenyu Chen,Connor Daniel Sullivan,Sheng-Chih Lai,Ching Yu Yen,Xiaofan Jiang,Dimitrios Peroulis,Lia Stanciu
出处
期刊:ACS omega
[American Chemical Society]
日期:2022-08-10
卷期号:7 (33): 29195-29203
被引量:12
标识
DOI:10.1021/acsomega.2c03272
摘要
Two-dimensional transition-metal carbides and nitrides (MXenes) have been regarded as promising sensing materials because of their high surface-to-volume ratios and outstanding electronic, optical, and mechanical properties with versatile transition-metal and surface chemistries. However, weak gas-molecule adsorption of MXenes poses a serious limitation to their sensitivity and selectivity, particularly for trace amounts of volatile organic compounds (VOCs) at room temperature. To deal with these issues, Au-decorated MXenes are synthesized by a facile solution mixing method for room-temperature sensing of a wide variety of oxygen-based and hydrocarbon-based VOCs. Dynamic sensing experiments reveal that optimal decoration of Au nanoparticles (NPs) on Ti3C2T x MXene significantly elevates the response and selectivity of the flexible sensors, especially in detecting formaldehyde. Au-Ti3C2T x gas sensors exhibited an extremely low limit of detection of 92 ppb for formaldehyde at room temperature. Au-Ti3C2T x provides reliable gas response, low noise level, ultrahigh signal-to-noise ratio, high selectivity, as well as parts per billion level of formaldehyde detection. The prominent mechanism for Au-Ti3C2T x in sensing formaldehyde is elucidated theoretically from density functional theory simulations. The results presented here strongly suggest that decorating noble-metal NPs on MXenes is a feasible strategy for the development of next-generation ultrasensitive sensors for Internet of Things.
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