Title :
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
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;
Conference_Titel :
Sensors (IBERSENSOR), 2014 IEEE 9th Ibero-American Congress on
Conference_Location :
Bogota
Print_ISBN :
978-1-4799-6835-0
DOI :
10.1109/IBERSENSOR.2014.6995523
