Next Article in Journal
Localization of an Underwater Control Network Based on Quasi-Stable Adjustment
Previous Article in Journal
Recent Progress in Technologies for Tactile Sensors
Article Menu
Issue 4 (April) cover image

Export Article

Open AccessArticle

Remarkably Enhanced Room-Temperature Hydrogen Sensing of SnO2 Nanoflowers via Vacuum Annealing Treatment

Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials—Hubei Key Laboratory of Ferro & Piezoelectric Materials and Devices, Faculty of Physics & Electronic Sciences, Hubei University, Wuhan 430062, China
School of Electronic Information, Huanggang Normal University, Huanggang 438000, China
Authors to whom correspondence should be addressed.
Sensors 2018, 18(4), 949;
Received: 22 January 2018 / Revised: 7 March 2018 / Accepted: 12 March 2018 / Published: 23 March 2018
(This article belongs to the Section Chemical Sensors)
PDF [12830 KB, uploaded 23 March 2018]


In this work, SnO2 nanoflowers synthesized by a hydrothermal method were employed as hydrogen sensing materials. The as-synthesized SnO2 nanoflowers consisted of cuboid-like SnO2 nanorods with tetragonal structures. A great increase in the relative content of surface-adsorbed oxygen was observed after the vacuum annealing treatment, and this increase could have been due to the increase in surface oxygen vacancies serving as preferential adsorption sites for oxygen species. Annealing treatment resulted in an 8% increase in the specific surface area of the samples. Moreover, the conductivity of the sensors decreased after the annealing treatment, which should be attributed to the increase in electron scattering around the defects and the compensated donor behavior of the oxygen vacancies due to the surface oxygen adsorption. The hydrogen sensors of the annealed samples, compared to those of the unannealed samples, exhibited a much higher sensitivity and faster response rate. The sensor response factor and response rate increased from 27.1% to 80.2% and 0.34%/s to 1.15%/s, respectively. This remarkable enhancement in sensing performance induced by the annealing treatment could be attributed to the larger specific surface areas and higher amount of surface-adsorbed oxygen, which provides a greater reaction space for hydrogen. Moreover, the sensors with annealed SnO2 nanoflowers also exhibited high selectivity towards hydrogen against CH4, CO, and ethanol. View Full-Text
Keywords: hydrogen sensing; SnO2; annealing; nanoflowers; hydrothermal hydrogen sensing; SnO2; annealing; nanoflowers; hydrothermal

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

Share & Cite This Article

MDPI and ACS Style

Liu, G.; Wang, Z.; Chen, Z.; Yang, S.; Fu, X.; Huang, R.; Li, X.; Xiong, J.; Hu, Y.; Gu, H. Remarkably Enhanced Room-Temperature Hydrogen Sensing of SnO2 Nanoflowers via Vacuum Annealing Treatment. Sensors 2018, 18, 949.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics



[Return to top]
Sensors EISSN 1424-8220 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top