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The prior rules of designing Ti_(3)C_(2)T_(x) mxene-based gas sensors

Frontiers of Chemical Science and Engineering 2021年第3期15卷 505-517页

作者： Yingying Jian Danyao Qu Lihao Guo Yujin Zhu Chen Su Huanran Feng Guangjian Zhang Jia Zhang Weiwei Wu Ming-Shui Yao School of Advanced Materials and Nanotechnology Interdisciplinary Research Center of Smart SensorsXidian UniversityXi’an 710126China Institute for Integrated Cell-Material Sciences Kyoto University Institute for Advanced StudyKyoto UniversityKyoto 606-8501Japan Department of Thoracic Surgery The First Affiliated Hospital of Xi’an Jiaotong UniversityXi’an 710061China

Working temperature,sensitivity,and selectivity are some of the characteristics of the applied gas sensors.How to design and fabricate an ideal gas sensor working at room temperature is still challenging and attracting lots of interest.Two-dimensional(2D)materials with ultra-thin structure have been demonstrated as a family of ideal candidates to achieve this goal.Among them,Ti_(3)C_(2)T_(x) mxene,a kind of layered sheet synthesized by selectively etching MAX phases materials,shows remarkable potential to be the sensitive materials solely or in a composite.However,their designing rules are still lacking critical thinking from the viewpoint of the intrinsic property of Ti_(3)C_(2)T_(x) mxene based materials.In this article,two critical features,i.e.,the thickness of the sensitive materials,and the scope of the analytes,are elaborated towards Ti_(3)C_(2)T_(x) mxene based gas sensors after characterizing the performance of sensing reducing gases(NH3 and CO)and oxidizing gas(NO2).First,the thinner the Ti_(3)C_(2)T_(x) mxene sensitive layer,the better the sensitivity.Second,the Ti_(3)C_(2)T_(x) mxene based gas sensor is not suitable for strong and moderate oxidation gas due to its ease of oxidation.These two rules are demonstrated,and could be considered with priority both in the future researches and practical applications.

关键词： MXene based sensor prior reducing gases oxidizing gases

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