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Vol. 92, Issue 5, May 2008, pp. 43-54




Optical Fiber Humidity Sensor Based on Ag Nanoparticles Dispersed in Leaf Extract of Alstonia Scholaris


Anu VIJAYAN1*, Madhavi V. FUKE1, Prajakta KANITKAR1, R. N. KAREKAR2, R. C. AIYER1

1Center for Sensor Studies,

Department of Physics, University of Pune, Pune -411007, India

2RCMF Transducer Lab, Department of Physics, University of Pune, Pune-411 007, India

Fax: (+91-20-) 2569 1684, Tel.: (+91-20-) 2569 2678, E-mail: anup@physics.unipune.ernet.in



Received: 12 April 2008   /Accepted: 20 May 2008   /Published: 26 May 2008


Abstract: An optical fiber with a clad of Ag nanoparticles dispersed in leaf extract of Alstonia Scholaris is used as an optical humidity sensor. The fabricated sensor showed response to humidity in the range of 40-95%. The specialty of this sensor is that it can be used when stored at room temperature (25 oC) up to a maximum of 25 days with 90% retention of original sensitivity. These humidity sensing bio-films showed good operational efficiency for 5 cycles. The plastic optical fiber is versatile and can be used easily for humidity measurement with high sensitivity. The sensor exhibited a short response time of 4-5 sec. and recovery time of 45 sec with repeatability, reproducibility and low hysteresis effect.  This Ag dispersed in leaf extract of Alstonia Scholaris showed higher humidity response compared to response shown by the leaf extract alone.


Keywords: Humidity biosensor, Optical waveguide, Relative humidity


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