Pt nanoparticles sensitized ordered mesoporous WO3 semiconductor: gas sensing performance and mechanism study

Junhao Ma, Yuan Ren, Xinran Zhou, Liangliang Liu, Yongheng Zhu, Xiaowei Cheng, Pengcheng Xu, Xinxin Li, Yonghui Deng, Dongyuan Zhao

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301 Citations (Scopus)

Abstract

In this study, a straightforward coassembly strategy is demonstrated to synthesize Pt sensitized mesoporous WO3 with crystalline framework through the simultaneous coassembly of amphiphilic poly(ethylene oxide)-b-polystyrene, hydrophobic platinum precursors, and hydrophilic tungsten precursors. The obtained WO3/Pt nanocomposites possess large pore size (≈13 nm), high surface area (128 m2 g−1), large pore volume (0.32 cm3 g−1), and Pt nanoparticles (≈4 nm) in situ homogeneously distributed in mesopores, and they exhibit excellent catalytic sensing response to CO of low concentration at low working temperature with good sensitivity, ultrashort response-recovery time (16 s/1 s), and high selectivity. In-depth study reveals that besides the contribution from the fast diffusion of gaseous molecules and rich interfaces in mesoporous WO3/Pt nanocomposites, the partially oxidized Pt nanoparticles that chemically and electronically sensitize the crystalline WO3 matrix, dramatically enhance the sensitivity and selectivity.

Original languageEnglish
Article number1705268
Number of pages12
JournalAdvanced Functional Materials
Volume28
Issue number6
DOIs
Publication statusPublished - 7 Feb 2018
Externally publishedYes

Keywords

  • gas sensors
  • mesoporous materials
  • noble metals
  • sensing mechanism
  • tungsten oxide

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