Preparation of TiO2 nanowire arrays through hydrothermal growth method and their pH sensing characteristics

Yen Chieh Huang; Fu Shou Tsai; Shui Jinn Wang

doi:10.7567/JJAP.53.06JG02

Preparation of TiO₂ nanowire arrays through hydrothermal growth method and their pH sensing characteristics

Yen Chieh Huang, Fu Shou Tsai, Shui Jinn Wang

Institute of Microelectronics

Research output: Contribution to journal › Article › peer-review

17 Citations (Scopus)

Abstract

The use of a TiO₂ nanowire (NW) hydrothermally grown on an fluorine-doped tin oxide (FTO) substrate as a separated sensing electrode of an extended-gate field-effect-transistor (SE-EGFET) pH sensor is demonstrated. Sensing responses to the prepared samples in a wide pH range (2-12) are presented and compared with responses of a film-type TiO₂ electrode. The pH sensors with the NW-type and film-type electrodes show a sensitivity of 62 and 50mV/pH, respectively, and a comparably good linearity in the pH range of 2-12. The superiority of the NW-type TiO2 electrode (24% improvement in sensitivity compared with that of the film-type electrode) is attributed mainly to the higher surface-to-volume (SV) ratio and higher conductivity of the hydrogen thermal growth (HTG) nanowires.

Original language	English
Article number	06JG02
Journal	Japanese journal of applied physics
Volume	53
Issue number	6 SPEC. ISSUE
DOIs	https://doi.org/10.7567/JJAP.53.06JG02
Publication status	Published - 2014 Jun

All Science Journal Classification (ASJC) codes

Engineering(all)
Physics and Astronomy(all)

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abstract = "The use of a TiO2 nanowire (NW) hydrothermally grown on an fluorine-doped tin oxide (FTO) substrate as a separated sensing electrode of an extended-gate field-effect-transistor (SE-EGFET) pH sensor is demonstrated. Sensing responses to the prepared samples in a wide pH range (2-12) are presented and compared with responses of a film-type TiO2 electrode. The pH sensors with the NW-type and film-type electrodes show a sensitivity of 62 and 50mV/pH, respectively, and a comparably good linearity in the pH range of 2-12. The superiority of the NW-type TiO2 electrode (24% improvement in sensitivity compared with that of the film-type electrode) is attributed mainly to the higher surface-to-volume (SV) ratio and higher conductivity of the hydrogen thermal growth (HTG) nanowires.",

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AU - Tsai, Fu Shou

AU - Wang, Shui Jinn

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AB - The use of a TiO2 nanowire (NW) hydrothermally grown on an fluorine-doped tin oxide (FTO) substrate as a separated sensing electrode of an extended-gate field-effect-transistor (SE-EGFET) pH sensor is demonstrated. Sensing responses to the prepared samples in a wide pH range (2-12) are presented and compared with responses of a film-type TiO2 electrode. The pH sensors with the NW-type and film-type electrodes show a sensitivity of 62 and 50mV/pH, respectively, and a comparably good linearity in the pH range of 2-12. The superiority of the NW-type TiO2 electrode (24% improvement in sensitivity compared with that of the film-type electrode) is attributed mainly to the higher surface-to-volume (SV) ratio and higher conductivity of the hydrogen thermal growth (HTG) nanowires.

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Preparation of TiO₂ nanowire arrays through hydrothermal growth method and their pH sensing characteristics

Abstract

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