Mechanism of the sensitivity enhancement in TiO2hollow-hemisphere gas sensors

Hi Gyu Moon, Ho Won Jang, Jin Sang Kim, Hyung Ho Park, Seok Jin Yoon

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)


We investigate the mechanism of the sensitivity enhancement in TiO2 hollow-hemisphere gas sensors. Using monolayer close-packed polystyrene microspheres as a sacrificial template, a TiO2 thin film based on a network of ordered hollow hemispheres is formed by room-temperature sputtering deposition and subsequent calcination at 550°C. A thin film gas sensor based on the TiO2 hollow hemispheres exhibits a 225% change in its resistance when exposed to 50 ppm CO at 250°C, whereas a gas sensor based on a flat TiO2 film shows an 85% change. Numerical analysis reveals that the enhancement of the gas sensitivity in the hollow-hemisphere gas sensor is simply the result of an increase in the effective surface area for the adsorption of gas molecules.

Original languageEnglish
Pages (from-to)135-139
Number of pages5
JournalElectronic Materials Letters
Issue number4
Publication statusPublished - 2010 Dec

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials


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