Ag-Modified In2O3/ZnO Nanobundles with High Formaldehyde Gas-Sensing Performance

Fang Fang, Lu Bai, Dongsheng Song, Hongping Yang, Xiaoming Sun, Hongyu Sun, Jing Zhu

Research output: Contribution to journalJournal articleResearchpeer-review


Ag-modified In2O3/ZnO bundles with micro/nano porous structures have been designed and synthesized with by hydrothermal method continuing with dehydration process. Each bundle consists of nanoparticles, where nanogaps of 10-30 nm are present between the nanoparticles, leading to a porous structure. This porous structure brings high surface area and fast gas diffusion, enhancing the gas sensitivity. Consequently, the HCHO gas-sensing performance of the Ag-modified In2O3/ZnO bundles have been tested, with the formaldehyde-detection limit of 100 ppb (parts per billion) and the response and recover times as short as 6 s and 3 s, respectively, at 300 degrees C and the detection limit of 100 ppb, response time of 12 s and recover times of 6 s at 100 degrees C. The HCHO sensing detect limitation matches the health standard limitation on the concentration of formaldehyde for indoor air. Moreover, the strategy to synthesize the nanobundles is just two-step heating and easy to scale up. Therefore, the Ag-modified In2O3/ZnO bundles are ready for industrialization and practical applications.
Original languageEnglish
Issue number8
Pages (from-to)20086-20096
Number of pages11
Publication statusPublished - 2015
Externally publishedYes


  • In2O3/ZnO
  • Conductivity
  • Formaldehyde sensing
  • Hierarchical porosity
  • Negative curvature


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