Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 6, Issue 2, Pages 1251-1257Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am4050844
Keywords
colloidal crystal; monolayer ordered porous film; SnO2; photochemical preparation; air-water interface; gas sensor
Funding
- National Natural Science Foundation of China [31071057]
- Research Project of Chinese Ministry of Education [213029A]
- Natural Science Foundation of Guangdong Province [10351063101000001, S2011010003499]
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A new photochemistry-based method was introduced for fabricating SnO2 monolayer ordered porous films with size-tunable surface pores on ceramic tubes used for gas sensors. The growth of the spherical pore walls was controlled by two times irradiation of the ultraviolet light using polystyrene microsphere two-dimensional colloidal crystal as a template. The surface pore size of the final obtained porous films was well tuned by changing the second irradiation time rather than replacing the template microspheres. The monolayer ordered porous films on the tubes were directly used, for the first time, as gas sensors. The sensitivity of the sensor depended on the surface pore size and was carefully analyzed by ethanol gas detection. The sensor also exhibited short response-recovery time and long-term stability at lower than 300 degrees C in practical applications. Therefore, this study opens up a kind of construction method for gas sensors, provides a new strategy for controlling the surface pore size of the monolayer ordered porous film, and introduces a new type of sensitivity-controllable gas sensor.
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