pH sensors based in TiO2 NTs arrays

Author

Marques, P.A. ; Monteiro, G.Z. ; Pereyra, I. ; Albertin, K.F.

Author_Institution

Inst. Fed. de Educ. Cienc. e Tecnol. de Mato Grosso - Pontes e Lacerda, IFMT, Pontes e Lacerda, Brazil

fYear

2014

fDate

15-18 Oct. 2014

Firstpage

1

Lastpage

4

Abstract

pH sensor fabricated with TiO₂ nanotube arrays with diameter and length controlled by the anodization voltage and time were obtained and characterized. The TiO₂ nanotube arrays were obtained by Ti foil anodization in a NH4F organic solution with 20 and 40 V for 5, 15 and 25 min. pH sensors based on Ti₂ NTs electrodes presented linear response respect to the pH value in the 4-10 pH range. The pH sensor with nanotubes obtained with 20V / 25 min presents a reproducible response and the best sensitivity value, 45.8 mV/pH. This TiO₂ NTs pH sensor irradiated by UV shows a very stable response and a sensitivity value of 50.9 mV/pH close to Nernst equation (59 mV/pH).

Keywords

anodisation; chemical sensors; nanosensors; nanotubes; pH measurement; titanium compounds; ultraviolet radiation effects; TiO₂; UV radiation; anodization voltage; nanotube arrays; pH sensors; time 15 min; time 25 min; time 5 min; titanium foil anodization; voltage 20 V; voltage 40 V; Electrodes; Fabrication; Radiation effects; Sensitivity; Sensor arrays; Sensor phenomena and characterization; Electrochemical anodization; Self-cleaning effect; TiO2 nanotubes; pH sensor;

fLanguage

English

Publisher

ieee

Conference_Titel

Sensors (IBERSENSOR), 2014 IEEE 9th Ibero-American Congress on

Conference_Location

Bogota

Print_ISBN

978-1-4799-6835-0

Type

conf

DOI

10.1109/IBERSENSOR.2014.6995523

Filename

6995523