Title :
Study of pH sensors based on TiO2 nanotubes
Author :
Monteiro, G.Z. ; Marques, P.A. ; Pereyra, I. ; Albertin, K.F.
Author_Institution :
CECS, Univ. Fed. do ABC, Santo Andre, Brazil
Abstract :
TiO2 nanotube arrays obtained by Ti foil anodization are tested as pH electrodes, showing performance close to standard glass electrodes. The TiO2 nanotube arrays were obtained by Ti foil anodization in a NH4F organic solution with 20, 40 and 60 V and different anodization times. The obtained nanotubes samples were characterized by Scanning Electron Microscopy (SEM). Electrode modified by TiO2 nanotubes were characterized in pH buffer solution (pH of 4.0, 7.0 and 10.0) and the obtained results show that electrode modified by NTs obtained with anodization voltage of 40 V with 45 minutes presents an almost linear response close to Nernst equation (59 mV/pH).
Keywords :
anodisation; chemical sensors; nanofabrication; nanosensors; pH measurement; scanning electron microscopy; semiconductor growth; semiconductor nanotubes; titanium compounds; wide band gap semiconductors; Nernst equation; SEM; Ti foil anodization; TiO2; anodization times; anodization voltage; linear response; organic solution; pH buffer solution; pH electrodes; pH sensors; scanning electron microscopy; time 45 min; titania nanotube arrays; voltage 40 V; Anodes; Microscopy; Nanotubes; Platinum; Welding; TiO2 nanotubes; pH sensors;
Conference_Titel :
Microelectronics Technology and Devices (SBMicro), 2014 29th Symposium on
Conference_Location :
Aracaju
DOI :
10.1109/SBMicro.2014.6940087
