Enhanced detection of ppb-level NO2 by uniform Pt-doped ZnSnO3 nanocubes

• 作者: Yaoyu Yin Yanbai Shen Sikai Zhao Ang Li Rui Lu Cong Han Baoyu Cui Dezhou Wei
• 来源期刊: 矿物冶金与材料学报
• 年，卷（期）: 2022,（6）
• 页码范围: 1295-1303
• 页数: 9页
• 语种: 英文

摘要

ZnSnO3 nanocubes (ZSNCs) with various Pt concentrations (i.e., 1at％, 2at％, and 5at％) were synthesized by a simple one-pot hy-drothermal method. The microstructures of pure and Pt-doped ZSNCs were characterized by X-ray diffractometry, scanning electron micro-scopy, transmission electron microscopy, energy-dispersive X-ray spectroscopy, and X-ray photoelectron spectroscopy. Results showed that the pure ZSNCs have a perovskite structure with a side length of approximately 600 nm; this length was reduced to 400 nm after Pt doping. Following doping, PtOx (PtO and PtO2) nanoparticles with a diameter of approximately 5 nm were uniformly coated on the surface of the ZS-NCs. Systematic investigation of the gas-sensing abilities of the nanocubes showed that the Pt-doped ZSNCs have excellent sensing properties toward nitrogen dioxide (NO2) gas in the operating temperature range of 75–175℃. Among the sensors prepared, that based on 1at％ Pt-doped ZSNCs exhibited the best response of 16.0 toward 500 ppb NO2 at 125℃; this response is over 11 times higher compared with that of pure ZS-NCs. The enhanced NO2 sensing mechanism of the Pt-doped ZSNCs may be attributed to the synergistic effects of catalytic activity and chem-ical sensitization by Pt doping.