Low-cost fabrication of highly sensitive room temperature hydrogen sensor based on ordered mesoporous Co-doped TiO2 structure

作者：Li, Zhong; Haidry, Azhar Ali^*; Wang, Tao; Yao, Zheng Jun^*

来源：Applied Physics Letters, 2017, 111(3): 032104.

DOI：10.1063/1.4994155

• TITANIUM-DIOXIDE NANOMATERIALS
• SEMICONDUCTOR GAS SENSORS
• SENSING PROPERTIES
• SCHOTTKY DIODE
• SNO2 SENSORS
• THIN-FILM
• IN-SITU
• WATER
• HUMIDITY
• MECHANISMS

The development of cost-effective gas sensors with improved sensing properties and minimum power consumption for room temperature hydrogen leakage monitoring is in increasing demand. In this context, this report focus on the facile fabrication of ordered mesoporous TiO2 via evaporation-induced self-assembly route. With the controlled doping threshold (3%Co-TiO2), the output resistance change to 1000 ppm H-2 is similar to 4.1 x 10(3) with the response time of 66 s. The sensor response exhibits power law dependence with an increase in the hydrogen concentration, where the power law coefficient was found not only specific to the kind of target gas but also related to temperature. Further, the effect of structure integrity with doping level and humidity on sensing characteristics is interpreted in terms of variation in surface potential eV(S) and depletion region w caused by the adsorption of molecular oxygen O-2(-). Published by AIP Publishing.

• 出版日期2017-7-17
• 单位南京航空航天大学