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Open AccessArticle

A Fast Humidity Sensor Based on Li+-Doped SnO2 One-Dimensional Porous Nanofibers

School of Advanced Materials, Peking University Shenzhen Graduate School, Shenzhen 518055, China
Institute of Chemical Materials, China Academy of Engineering Physics, Mianyang 621900, China
Institute for Frontier Materials, Deakin University, Geelong, Victoria 3216, Australia
Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, 5625 Renmin Street, Changchun 130022, China
Alan G. MacDiarmid Institute, Jilin University, Changchun 130012, China
College of Science, China University of Petroleum, Qingdao 266580, China
Author to whom correspondence should be addressed.
Academic Editor: Homayoun Hadavinia
Materials 2017, 10(5), 535;
Received: 23 March 2017 / Revised: 7 May 2017 / Accepted: 11 May 2017 / Published: 16 May 2017
(This article belongs to the Special Issue Improving Performance of Nanocomposite Materials)
One-dimensional SnO2- and Li+-doped SnO2 porous nanofibers were easily fabricated via electrospinning and a subsequent calcination procedure for ultrafast humidity sensing. Different Li dopant concentrations were introduced to investigate the dopant’s role in sensing performance. The response properties were studied under different relative humidity levels by both statistic and dynamic tests. The best response was obtained with respect to the optimal doping of Li+ into SnO2 porous nanofibers with a maximum 15 times higher response than that of pristine SnO2 porous nanofibers, at a relative humidity level of 85%. Most importantly, the ultrafast response and recovery time within 1 s was also obtained with the 1.0 wt % doping of Li+ into SnO2 porous nanofibers at 5 V and at room temperature, benefiting from the co-contributions of Li-doping and the one-dimensional porous structure. This work provides an effective method of developing ultrafast sensors for practical applications—especially fast breathing sensors. View Full-Text
Keywords: humidity sensor; electrospun porous nanofibers; lithium doping; response-recovery behavior humidity sensor; electrospun porous nanofibers; lithium doping; response-recovery behavior
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MDPI and ACS Style

Yin, M.; Yang, F.; Wang, Z.; Zhu, M.; Liu, M.; Xu, X.; Li, Z. A Fast Humidity Sensor Based on Li+-Doped SnO2 One-Dimensional Porous Nanofibers. Materials 2017, 10, 535.

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