Ultrasensitive ammonia gas sensor based on Ti3C2Tx/Ti3AlC2 planar composite at room temperature

被引：31
作者：
Liu, Zhihua [1 ,2 ,3 ]
Han, Dan [1 ,2 ]
Liu, Lulu [1 ,2 ,3 ]
Li, Donghui [1 ,2 ,3 ]
Han, Xiaomei [1 ,2 ]
Chen, Yi [1 ,2 ]
Liu, Xiaoru [1 ,2 ]
Zhuo, Kai [1 ,2 ]
Cheng, Yongqiang [1 ,2 ]
Sang, Shengbo [1 ,2 ,3 ]
机构：
[1] Taiyuan Univ Technol, Coll Informat & Comp, Shanxi Key Lab Micro Nano Sensors & Artificial Int, Taiyuan 030024, Peoples R China
[2] Taiyuan Univ Technol, Key Lab Adv Transducers & Intelligent Control Syst, Minist Educ, Taiyuan 030024, Peoples R China
[3] Shanxi Res Inst 6D Artificial Intelligence Biomed, Taiyuan 030024, Peoples R China
来源：
SENSORS AND ACTUATORS B-CHEMICAL | 2023年 / 378卷
基金：
中国国家自然科学基金;
关键词：
MXene; Ti3AlC2; composite; Gas sensing; 2D materials; Ppb detection; PERFORMANCE;
D O I：
10.1016/j.snb.2022.133149
中图分类号：
O65 [分析化学];
学科分类号：
070302 ; 081704 ;
摘要：
Two-dimensional (2D) transition metal carbides (MXene) have attracted great attention for device applications due to their unique structures and excellent properties, such as high electrical conductivity and abundant functional groups on the surface. However, gas sensors based on Ti3C2Tx MXene have the problems of high detection limit and poor long-term stability. Herein, we report a simple method to prepare Ti3C2Tx/Ti3AlC2 planar composite gas sensing materials using high molar ratio of HCl and LiF with Ti3AlC2 as a framework. The Ti3C2Tx/Ti3AlC2 planar composite gas sensor has a high sensitivity, good selectivity and low detection limit for NH3, which can detect 50 ppb (1.2%) at room temperature ((25 +/- 2) celcius). Furthermore, the gas sensor has good repeatability and long-term stability. After 120 days, the response of the gas sensor to 500 ppb of NH3 fluctuated little due to the Ti3AlC2 as a framework. The superior performances can be attributed to the special hetero-junction between Ti3C2Tx and Ti3AlC2 and the high proportion of-O and-OH functional groups on the surface of Ti3C2Tx/Ti3AlC2 composite. This study provides an important reference for the realization of high performance NH3 sensing by Ti3C2Tx.
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页数：10
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