Synthesis of few-layered Ti3C2Tx/ WO3 nanorods foam composite material for NO2 gas sensing at low temperature |
| |
| Affiliation: | 1. State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming, 650093, China;2. Department of Chemical and Materials Engineering, University of Alberta, Edmonton, T6G 2V4, Alberta, Canada;3. Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming, 650093, China;4. Sinochem International Corporation, Beijing, 100045, China;5. College of Biomass Science and Engineering, Sichuan University, Chengdu, 610065, China;1. Anhui Engineering Research Center for High Efficiency Intelligent Photovoltaic Module, Chaohu University, Hefei, 238000, China;2. College of Mechanical Engineering, Chaohu University, Hefei, 238000, China;1. Laboratório de Materiais Vítreos, Departamento de Engenharia de Materiais, Universidade Federal de São Carlos, 13565-905, São Carlos, SP, Brazil;2. Laboratório de Hematologia e Células-tronco, Faculdade de Farmácia, Universidade Federal Do Rio Grande Do Sul, 90610-000, Porto Alegre, RS, Brazil;3. Universidade Federal de Ciências da Saúde de Porto Alegre, 90050-170, Porto Alegre, RS, Brazil;4. Instituto de Pesquisa Com Células-tronco, 90020-010, Porto Alegre, RS, Brazil;5. Faculdade de Odontologia de Araçatuba, Departamento de Odontologia Preventiva e Restauradora, Universidade Estadual Paulista Júlio de Mesquita Filho, 16015-050, Araçatuba, SP, Brazil;6. Laboratório de Ensaios Antimicrobianos, Instituto de Ciências Biomédicas, Universidade Federal de Uberlândia, 38400-902, Uberlândia, MG, Brazil;1. Materials and Structures Division, NASA Glenn Research Center, 21000 Brookpark Road, Cleveland, OH, 44135, USA;2. University of Toledo, Toledo, OH, USA;1. School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu, 610054, China;2. Information Materials and Intelligent Sensing Laboratory of Anhui Province, Anhui University, Hefei, 230601, China |
| |
| Abstract: | The few-layered Ti3C2Tx/WO3 nanorods foam composite material was synthesized by electrostatic self-assembly and bidirectional freeze-drying technologies. The phase structure and microstructure of synthesized samples was characterized by XRD, FESEM, TEM and their gas sensing properties estimated via a self-designed equipment with four test channels. The results demonstrate WO3 nanorods were successfully anchored on the surface and between layers of few-layered Ti3C2Tx MXene by electrostatic self-assembly strategy and the composite material simultaneously has a low-density foam morphology by means of bidirectional freeze-drying processes. There exists a typical heterostructure at the interfaces owing to the inseparable contact between the few-layered Ti3C2Tx MXene and WO3 nanorods. Compared with the original WO3 nanorods, the few-layered Ti3C2Tx/WO3 nanorods foam composite material displays excellent gas sensing properties for NO2 detection at low temperature, in particular the optimal value of gas sensing response (Rg/Ra) reaches to 89.46 toward 20 ppm NO2 at 200 °C. The gas sensing mechanism was also discussed. The increase of gas sensitivity is attributed to a fact that during the reaction process of gas sensing, the excellent conductivity of the few-layered Ti3C2Tx MXene provided faster transport channels of free carriers, and the heterojunctions formed by few-layered Ti3C2Tx MXene and WO3 nanorods enhanced the carriers separation efficiency. Meanwhile, the low-density layered structure of few-layered Ti3C2Tx/WO3 nanorods foam composite material provides convenient diffusion paths for gas molecules to the surface of WO3 nanorods. |
| |
| Keywords: | Freeze-drying Foam composite material Low temperature Gas sensing |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
