UV-enhanced hydrogen sensor based on nanocone-assembled 3D SnO2 at low temperature

作者：Li, Tianming; Zeng, Wen^*; Shi, Dongfeng; Hussain, Shahid

来源：Materials Letters, 2015, 161: 648-651.

DOI：10.1016/j.matlet.2015.09.077

• Sensors
• UV irradiation
• Hedgehog-like SnO2
• Low temperature
• Semiconductors

In this paper, nanocone-assembled hedgehog-like SnO2 was synthesized via a facile hydrothermal process. Once under UV irradiation, the response of the as-prepared 3D SnO2 towards 100 ppm H-2 at low temperature (50 degrees C) was improved almost 3.5 times (S=9.5) over that in dark. The enhancement may be attributed to the co-effect from three aspects: (1) the heavy electron depletion induced by oxygen chemisorption due to the Debye length scale dimensions of nanocones; (2) vast reaction sites and sufficient diffusion spaces provided by the 1D-3D configuration; (3) the possibility that the refreshed photoinduced oxygen ions on the surface of SnO2 are more energetic than chemisorbed oxygen ions and promote the photo-catalytic reaction of H-2 even at low temperature.

• 出版日期2015-12-15
• 单位重庆大学