GS6.3 - Enhanced Sensing Performance of Pt-decorated Al-doped ZnO Nanoparticles for detection of Acetone

17th International Meeting on Chemical Sensors - IMCS 2018
2018-07-15 - 2018-07-19
Vienna, Austria
Gas Sensors 6 - Sensing VOCs
A. Koo, R. Yoo, S. Woo, H. Lee, W. Lee - Department of Materials Science and Engineering, Yonsei University, Seoul (South Korea)
238 - 239


We report the excellent sensing performance of Pt-decorated Al-doped ZnO (Pt-AZO) nanoparticles (NPs) for the detection of the hazardous gas acetone (CH3COCH3). The Al-doped ZnO (AZO) NPs were synthesized using a hydrothermal method in an aqueous solution containing Al. Platinum was deposited on the surface of the AZO NPs during sputtering, spontaneously stirring the AZO NPs in an agitated vessel. Under the exposure to 10 ppm acetone at 450°C, the Pt-AZO NPs exhibited a remarkably enhanced sensing response (R) and response time (tR) compared to those of the AZO and the pure ZO NPs: (i) R = 421 and tR = 2.9 s for the Pt-AZO, (ii) R = 56 and tR = 15 s for the AZO, and (iii) R = 17 and tR = 51 s for the pure ZO. Furthermore, the sensing properties of the Pt-AZO NPs to 10 ppm acetone was superior to previously reported acetone sensors that are based on semiconducting metal oxides. From physical and chemical analytic measurements, we found that the Pt NPs in the Pt- AZO NPs play a crucial role in improving the acetone sensing performance. The spillover effect, which is also called as the catalytic effect of the Pt NPs, can be ascribed to the greater number of oxygen vacancies, higher carrier concentration, and larger specific surface area in the Pt-AZO NPs than in the AZO NPs, providing more active adsorption sites as well as enhancing the kinetics of the surface reaction.