Humidity sensor; titanium oxide; sensing mechanism; optical fiber.

Fabrication Of Ultra-sensitive Optical Fiber Based Humidity Sensor Using TiO2 thin Film

S. K. Shukla1*, Anand Bharadvaja1, G. K. Parashar2, A. P. Mishra3 and G. C. Dubey4, Ashutosh Tiwari5*

1Bhaskaracharya College of Applied Sciences, University of Delhi, Delhi 110075, India

2Swami Shradhanand College, University of Delhi, Delhi 110036, India

3Department of Science and Technology, Technology Bhavan, Delhi 110061, India

4Institute of Defense Scientists and Technologists, S. K. Mazumdar Road, Delhi110054, India

5Biosensors and Bioelectronics Centre, Institute of Physics, Chemistry and Biology, Linköping University, S-58183, Linköping, Sweden

Adv. Mater. Lett., 2012, Current Issue, 3 (5), pp 365-370

DOI: 10.5185/amlett.2012.5350

Publication Date (Web): Sep 16, 2012

E-mail:  and 


Thin films of titanium dioxide in anatase form have been prepared using isobutyl titanate as precursor. The resulting TiO2 was coated on an U-shaped pyrex glass rod to sense the humidity of a controlled humid environment using optical fiber approach. The humidity sensing characteristics and the sensing mechanism have been investigated by measuring the output power of the sensor at different humidity. The developed humidity sensor was responded in the humidity ranging from 10 to 95% of relative humidity and exhibited the sensitivity of 0.78, response time 36s and recovery time 73s.


Humidity sensor,titanium oxide, sensing mechanism, optical fiber.

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