Effects of organotin halide perovskite and Pt nanoparticles in SnO2-based sensing materials on the detection of formaldehyde

  • Xinyu Zhang
  • Yue Sun
  • Yu Fan
  • Zhifu Liu
  • Zhigang Zeng
  • Hongbin Zhao
  • Xiaohong WangEmail author
  • Jiaqiang XuEmail author


HC(NH2)2SnI3 (FASnI3) organotin halide perovskite was firstly synthesized by a solution method and then decorated with Pt nanoparticles by immersion method. HC(NH2)2SnI3/SnO2/Pt was obtained by calcining the sample to oxidize part of the HC(NH2)2SnI3 into SnO2 at different temperature in air. The structural, morphological characteristics and formaldehyde sensing performance were studied at length. The results indicated that HC(NH2)2SnI3/SnO2/Pt obtained at 240 °C showed superior sensing properties, of which the response to 10 ppm formaldehyde at 80 °C was 47.5 and the response and recovery time was 40 s and 37 s, respectively. The corresponding detection limit was estimated as low as 65 ppb. The high performance of the sample could be ascribed to the reason that the introduction of moderate HC(NH2)2SnI3 into SnO2 could lead to the formation of n-n heterojunction, and the organic–inorganic hybrid perovskites with narrow bandgap could generate abundant electrons from low-temperature excitation and the electrons could be transferred through the n-n heterojunction to SnO2. Consequently, the optimum operating temperature for formaldehyde detection could be reduced by 120 °C compared with pure SnO2. Moreover, the Pt nanoparticles improved response value more than twofold generally, which might be attributed to spillover effect and high catalytic activity.



This research was supported by National Key Research and Development Program of China (2017YFB0102900), the Shanghai Natural Science Foundation (19ZR1418900), Opening Project of Key Laboratory of Inorganic Functional Materials and Devices, Chinese Academy of Sciences (KLIFMD201704), National Natural Science Foundation of China (61671284; U1704255), Shanghai Pujiang Program (17PJD016) and the Shanghai Municipal Education Commission (Peak Discipline Construction program).We also acknowledge the Instrumental Analysis and Research Center of Shanghai University for providing measurement services.


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Authors and Affiliations

  1. 1.NEST Lab, Department of Chemistry, Department of Physics, College of ScienceShanghai UniversityShanghaiChina
  2. 2.CAS Key Laboratory of Inorganic Functional Materials and DevicesShanghai Institute of Ceramics, Chinese Academy of SciencesShanghaiChina

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