TITLE:
Titanium Oxide Nanorods pH Sensors: Comparison between Voltammetry and Extended Gate Field Effect Transistor Measurements
AUTHORS:
Elidia Maria Guerra, Marcelo Mulato
KEYWORDS:
Titanium Oxide Nanorods, pH Sensors, EGFET, Voltammetry
JOURNAL NAME:
Materials Sciences and Applications,
Vol.5 No.7,
May
29,
2014
ABSTRACT: In recent years there has increased interest
in the characterization of titanium oxide nanorods for application in
analytical devices. The titanium oxide nanorods (NRTiO) were obtained by hydrothermal
reaction with a NaOH solution heated in the autoclave at 150°C for up to 50 h.
Experimental data indicate that the prepared nanorods consist of anatase and
rutile phases, with a possible interlayer structure. The NRTiO was investigated
as pH sensor in the pH range 2 - 12, and the extended gate field effect
transistor (EGFET) configuration presented a sensitivity of 49.6 mV/pH.
Voltammetric data showed a sensitivity of 47.8 mV/pH. These results indicate
that the material is a promising candidate for applications as an EGFET-pH
sensor and as a disposable biosensor in the future.