f-Ti3C2T x /ZIF-8异质结构增强NO2气体传感器的敏感性能

doi:10.16085/j.issn.1000-6613.2023-0904

化工进展 ›› 2024, Vol. 43 ›› Issue (7): 3946-3954.DOI: 10.16085/j.issn.1000-6613.2023-0904

• 材料科学与技术 • 上一篇

f-Ti₃C₂T _x /ZIF-8异质结构增强NO₂气体传感器的敏感性能

杜倩¹(), 侯明¹, 高冀芸¹(), 杨黎¹^,², 鲁元佳¹, 郭胜惠¹^,²

^1.昆明理工大学冶金与能源工程学院，云南昆明 650091
^2.省部共建复杂有色金属资源清洁利用国家重点实验室，云南昆明 650091

收稿日期:2023-06-01 修回日期:2023-12-18 出版日期:2024-07-10 发布日期:2024-08-14
通讯作者: 高冀芸
作者简介:杜倩（1995—），女，硕士研究生，研究方向为气体敏感材料。E-mail：1596993153@qq.com。
基金资助:
国家自然科学基金(52304400);云南省青年基金(202201AU070156);云南省教育厅科学研究基金(2022J0441);云南省高层次人才培养支持计划“云岭学者”专项(YNWR-YLXZ-2020-008)

Sensitive performance of NO₂ gas sensor enhanced by f-Ti₃C₂T _x /ZIF-8 heterostructures

DU Qian¹(), HOU Ming¹, GAO Jiyun¹(), YANG Li¹^,², LU Yuanjia¹, GUO Shenghui¹^,²

^1.School of Metallurgy and Energy Engineering, Kunming University of Science and Technology, Kunming 650091, Yunnan, China
^2.State Key Laboratory of Clean Utilization of Complex Nonferrous Metal Resources Co-constructed by Provinces and Ministries, Kunming 650091, Yunnan, China

Received:2023-06-01 Revised:2023-12-18 Online:2024-07-10 Published:2024-08-14
Contact: GAO Jiyun

摘要/Abstract

摘要：

采用自组装法合成了具有异质界面的f-Ti₃C₂T _x /ZIF-8复合材料，采用场发射扫描电子显微镜、X射线衍射、N₂等温吸脱附测试对合成样品的物相结构和微观结构进行了表征，并通过自行设计的四通道气敏测试设备对其气敏性能进行了研究。材料分析测试发现，形状规则的ZIF-8材料均匀分布于二维少层Ti₃C₂T _x 的表面与层间，在界面处存在典型的异质结构。气敏性能测试表明：在225℃下，该复合材料对100μL/L NO₂的气敏响应高达98.35%，且是ZIF-8材料气敏响应的2.1倍。认为强导电的f-Ti₃C₂T _x 与ZIF-8复合后形成的异质结构，不仅为ZIF-8与气体表面反应产生的自由电子提供导电通道，而且通过界面效应强化了复合材料表面气固反应时电子与空穴的分离效率，进而显著提升了复合材料对NO₂气体的气敏性能。同时，f-Ti₃C₂T _x / ZIF-8复合材料的层状结构可以为目标气体分子向ZIF-8的扩散提供方便路径。

关键词: 复合材料, 异质结构, 气敏性能, 导电通道, 分离效率

Abstract:

The f-Ti₃C₂T _x /ZIF-8 composite material with heterostructures was synthesized by electrostatic self-assembly technology. The phase structure and microstructure of synthesized samples were characterized by FESEM, XRD, N₂ isothermal adsorption-desorption tests and their gas sensing properties estimated via a self-designed equipment with four test channels. The material analysis and testing showed that ZIF-8 material with regular shape was well-distributed on the surface and between layers of two-dimensional few-layered Ti₃C₂T _x, and there existed a typical heterostructure at the interfaces. The gas sensing performance tests indicated that the gas sensing response of the composite material toward 100μL/L NO₂ was as high as 98.35%, which was 2.1 times that of the ZIF-8 material. The heterostructures formed by the recombination of strongly conductive two-dimensional f-Ti₃C₂T _x and ZIF-8 not only provided conductive channels for the free electrons generated by the surface reaction of ZIF-8 and gas, but also strengthened the separation efficiency of electrons and holes during the gas-solid reaction on the surface of the composite material through the interface effect. Therefore, the gas sensing performances of the composite material toward NO₂ gas were significantly improved. Meanwhile, the layered structure of few-layered f-Ti₃C₂T _x /ZIF-8 composite material provided convenient diffusion paths for gas molecules to the surface of ZIF-8.

Key words: composite material, heterostructures, gas sensing performance, conductive channels, separation efficiency

中图分类号:

TN304

杜倩, 侯明, 高冀芸, 杨黎, 鲁元佳, 郭胜惠. f-Ti₃C₂T _x /ZIF-8异质结构增强NO₂气体传感器的敏感性能[J]. 化工进展, 2024, 43(7): 3946-3954.

DU Qian, HOU Ming, GAO Jiyun, YANG Li, LU Yuanjia, GUO Shenghui. Sensitive performance of NO₂ gas sensor enhanced by f-Ti₃C₂T _x /ZIF-8 heterostructures[J]. Chemical Industry and Engineering Progress, 2024, 43(7): 3946-3954.

图/表 10

图1 四通道气敏测试系统

图2 Ti3C2T x MXene胶体、f-Ti3C2T x 、f-Ti3C2T x /ZIF-8复合材料的FESEM微观形貌图

图3 ZIF-8、f-Ti3C2T x 和f-Ti3C2T x /ZIF-8复合材料的XRD图

图4 ZIF-8、f-Ti3C2T x 和f-Ti3C2T x /ZIF-8复合材料的N2等温吸脱附曲线

图5 ZIF-8和f-Ti3C2T x /ZIF-8复合材料在不同工作温度下对100μL/L NO2气体的气敏响应情况

图6 在225℃，f-Ti3C2T x /ZIF-8复合材料对1000μL/L不同目标气体的气敏响应情况（仅NO2为100μL/L）

图7 在225℃下，f-Ti3C2T x /ZIF-8复合材料对不同浓度NO2气体的气敏响应曲线

图8 在225℃下f-Ti3C2T x /ZIF-8复合材料对100μL/L NO2气体的长期稳定性测试和动态响应-恢复曲线

表1 f-Ti3C2T x /ZIF-8复合材料与其他气敏材料对NO2气敏参数对比

材料	浓度/μL·L^-1	工作温度/℃	响应值/%	参考文献
f-Ti₃C₂T _x /ZIF-8	100	225	98.35	本工作
Ti₃C₂/TiO₂	100	180	19.76	[35]
Ag-In₂O₃	100	150	1.8	[36]
ZnO-rGO	100	25	47.4	[37]

图9 f-Ti3C2T x /ZIF-8复合材料中载流子传输示意图

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f-Ti₃C₂T _x /ZIF-8异质结构增强NO₂气体传感器的敏感性能

Sensitive performance of NO₂ gas sensor enhanced by f-Ti₃C₂T _x /ZIF-8 heterostructures

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