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Exploring fiber optic approach to sense humid environment over nano-crystalline zinc oxide film |
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| Authors: | S.K. Shukla Ashutosh Tiwari G.K. Parashar G.C. Dubey |
| Affiliation: | a Department of Polymer Science, Bhaskaracharya College of Applied Sciences, University of Delhi, New Delhi 110075, India b Department of Mechanical Engineering, University of Wisconsin-Milwaukee, 3200 N Cremar St., Milwaukee 53211, WI, USA c Swami Shradhanand College, University of Delhi, Delhi 110036, India d Department of Science and Technology, Technology Bhawan, New Delhi 110016, India e Institute of Defense Scientists and Technologists, C.F.E.E.S, S.K. Mazumdar Road, Delhi 110054, India |
| Abstract: | A novel humidity sensor made up of nano-crystalline zinc oxide (ZnO) film, coated onto the U-shaped typical glass substrate as a wave guide, conjugated with an optical fiber and He-Ne un-polarized laser source. The nano-crystalline zinc oxide (ZnO) was synthesized using single molecular precursor method. The resulting material was characterized with Fourier transform infrared spectroscopy (FTIR), X-ray diffractometry (XRD), thermogravimetric-differential thermal analysis (TG-DTA) and scanning electron microscopy (SEM). In the thin film, ZnO particles exhibited the wurtzite phase structure with the particle size in a diameter range of 70-80 nm. The humidity sensing characteristic has been estimated by measuring the optical permeability (OP) as a function of percentage relative humidity (%RH) in the ranging from 5 to 90 inside a closed chamber. The OP decreases linearly with increase in %RH with a respond time of about 30 and recovery time of 35 s. The sensor exhibits the sensitivity of 0.45 in the %RH range 5-50 and 0.30 from 50 to 90. |
| Keywords: | Molecular precursor Nano-crystalline ZnO film Fiber optics Humidity sensor |
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