title: Low-Temperature H2S Detection with Hierarchical Cr-Doped WO3 Microspheres.
abstract: Hierarchical Cr-doped WO3 microspheres have been successfully synthesized for efficient sensing of H2S gas at low temperatures. The hierarchical structures provide an effective gas diffusion path via well-aligned micro-, meso-, and macroporous architectures, resulting in significant enhancement in sensing response to H2S. The temperature and gas concentration dependence on the sensing properties elucidate that Cr dopants remarkably improve the response and lower the sensor' operating temperature down to 80 °C. Under 0.1 vol % H2S, the response of Cr-doped WO3 sensor is 6 times larger than pristine WO3 sensor at 80 °C. We suggest the increasing number of oxygen vacancies created by Cr dopants to be the underlying reason for enhancement of charge carrier density and accelerated reactions with H2S.
authors.affiliation: Department of Physics/Pen-Tung Sah Institute of Micro-Nano Science and Technology, Xiamen University , Xiamen 361005, China.|NOVITAS, Nanoelectronics Centre of Excellence, School of Electrical and Electronic Engineering, Nanyang Technological University , Singapore 639798, Singapore.
authors.forename: Yanrong
authors.initials: Y
authors.lastname: Wang
authors.affiliation: Department of Physics/Pen-Tung Sah Institute of Micro-Nano Science and Technology, Xiamen University , Xiamen 361005, China.
authors.forename: Bin
authors.initials: B
authors.lastname: Liu
authors.affiliation: Department of Physics/Pen-Tung Sah Institute of Micro-Nano Science and Technology, Xiamen University , Xiamen 361005, China.
authors.forename: Songhua
authors.initials: S
authors.lastname: Xiao
authors.affiliation: NOVITAS, Nanoelectronics Centre of Excellence, School of Electrical and Electronic Engineering, Nanyang Technological University , Singapore 639798, Singapore.
authors.forename: Xinghui
authors.initials: X
authors.lastname: Wang
authors.affiliation: NOVITAS, Nanoelectronics Centre of Excellence, School of Electrical and Electronic Engineering, Nanyang Technological University , Singapore 639798, Singapore.
authors.forename: Leimeng
authors.initials: L
authors.lastname: Sun
authors.affiliation: Department of Physics/Pen-Tung Sah Institute of Micro-Nano Science and Technology, Xiamen University , Xiamen 361005, China.
authors.forename: Han
authors.initials: H
authors.lastname: Li
authors.affiliation: Department of Physics/Pen-Tung Sah Institute of Micro-Nano Science and Technology, Xiamen University , Xiamen 361005, China.
authors.forename: Wuyuan
authors.initials: W
authors.lastname: Xie
authors.affiliation: Department of Physics/Pen-Tung Sah Institute of Micro-Nano Science and Technology, Xiamen University , Xiamen 361005, China.
authors.forename: Qiuhong
authors.initials: Q
authors.lastname: Li
authors.affiliation: NOVITAS, Nanoelectronics Centre of Excellence, School of Electrical and Electronic Engineering, Nanyang Technological University , Singapore 639798, Singapore.
authors.forename: Qing
authors.initials: Q
authors.lastname: Zhang
authors.affiliation: Department of Physics/Pen-Tung Sah Institute of Micro-Nano Science and Technology, Xiamen University , Xiamen 361005, China.
authors.forename: Taihong
authors.initials: T
authors.lastname: Wang
keywords: Cr dopant; H2S gas sensors; WO3; hierarchical; low temperature