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 |
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Article number | 06JG02 |
Journal | Japanese journal of applied physics |
Volume | 53 |
Issue number | 6 SPEC. ISSUE |
DOIs | |
Publication status | Published - 2014 Jun |
All Science Journal Classification (ASJC) codes
- Engineering(all)
- Physics and Astronomy(all)