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Open AccessArticle

A Micro Oxygen Sensor Based on a Nano Sol-Gel TiO2 Thin Film

State Key Laboratory for Manufacturing Systems Engineering, School of Mechanical Engineering, Xi'an Jiaotong University , Xi'an 710049, Shaanxi, China
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Sensors 2014, 14(9), 16423-16433; https://doi.org/10.3390/s140916423
Received: 17 July 2014 / Revised: 14 August 2014 / Accepted: 28 August 2014 / Published: 3 September 2014
(This article belongs to the Section Chemical Sensors)
An oxygen gas microsensor based on nanostructured sol-gel TiO2 thin films with a buried Pd layer was developed on a silicon substrate. The nanostructured titania thin films for O2 sensors were prepared by the sol-gel process and became anatase after heat treatment. A sandwich TiO2 square board with an area of 350 μm × 350 μm was defined by both wet etching and dry etching processes and the wet one was applied in the final process due to its advantages of easy control for the final structure. A pair of 150 nm Pt micro interdigitated electrodes with 50 nm Ti buffer layer was fabricated on the board by a lift-off process. The sensor chip was tested in a furnace with changing the O2 concentration from 1.0% to 20% by monitoring its electrical resistance. Results showed that after several testing cycles the sensor’s output becomes stable, and its sensitivity is 0.054 with deviation 2.65 × 104 and hysteresis is 8.5%. Due to its simple fabrication process, the sensor has potential for application in environmental monitoring, where lower power consumption and small size are required. View Full-Text
Keywords: O2 sensors; sol-gel; nanostructured; MEMS (Micro-Electro-Mechanical System); thin films; TiO2 O2 sensors; sol-gel; nanostructured; MEMS (Micro-Electro-Mechanical System); thin films; TiO2
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MDPI and ACS Style

Wang, H.; Chen, L.; Wang, J.; Sun, Q.; Zhao, Y. A Micro Oxygen Sensor Based on a Nano Sol-Gel TiO2 Thin Film. Sensors 2014, 14, 16423-16433.

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