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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vols. 754-755pH Measurement Using Titanium Dioxide...

pH Measurement Using Titanium Dioxide Nanoparticles Thin Film Based Sensors

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Abstract:

Optimization gap size and integration of TiO₂ nanoparticles thin film produce a sensitive sensor device. Sol-gel spin coated TiO₂ nanoparticles thin film is coated on a conventional fabricated IDEs with gap sizes of 7 μm, 10 μm, 14 μm and 17 μm which is then validated through electrical characterization. I-V characteristics of without and with TiO₂ thin film of various gap sizes are subjected to pH test are then plotted to describe the resistance of the devices and correlate with the sensitivity measurement. Sensing devices show that devices with larger spacing and greater pH values have higher current. On the other hand, integration of TiO₂ thin film reduced the resistance of devices. Among the four gap sizes, 7 μm gap sized device is the most sensitive one due to the tremendous difference after small amount of pH dropped on surface, thus lowering the detection limit.

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Advanced Materials Engineering and Technology III

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Periodical:

Applied Mechanics and Materials (Volumes 754-755)

Pages:

1120-1125

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.754-755.1120

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Online since:

April 2015

Authors:

A.Y.P. Puah*, Sharipah Nadzirah, Mohd Khairuddin Md Arshad, Mat Ayub Ramzan, A. Rahim Ruslinda, Uda Hashim

Keywords:

Gap Sizes or Spacing, Interdigitated Electrodes (IDEs), pH Sensor, Sol-Gel Method, TiO₂ Nanoparticles

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© 2015 Trans Tech Publications Ltd. All Rights Reserved

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