Sonochemical synthesis of hierarchically assembled tungsten oxides with excellent NO2-sensing properties

Shouli Bai, Kewei Zhang, Ruixian Luo, Dianqing Li, Aifan Chen, Chung Chiun Liu

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

Abstract

Hierarchically assembled WO3·H2O spheres have been synthesized successfully by a facile sonochemical approach using oxalic acid as capping agent. The resultant WO3·H2O spheres with diameter of 1-3 μm are actually assembled by many interlaced nanosheets with thickness of 10-20 nm. The as-obtained orthorhombic WO 3·H2O transforms into monoclinic WO3 without obvious change in morphology through annealing and dehydration. Furthermore, such 3D hierarchical spheres exhibit a strong structure-induced improvement in gas-sensing properties to ppm-level NO2, since the specific surface of sensing material and the gas diffusion are significantly enhanced due to its porous nano/microstructure. This work presents new insight towards the design of novel gas-sensing materials and improvement of sensor performance.

Original languageEnglish
Pages (from-to)32-34
Number of pages3
JournalMaterials Letters
Volume111
DOIs
StatePublished - 2013

Keywords

  • Porous materials
  • Semiconductors
  • Sensors
  • Tungsten oxide

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