Abstract
The present paper reports the effect of humidity on the transmitted power through the nanostructured copper (II) nitrate polyacrylamide (AAm) complex film at room temperature. For this purpose, the precursor of Cu(II) nitrate polyAAm was prepared and used for the deposition of a film on the substrates of borosilicate. The film was then investigated using SEM which revealed the uniform leaf-like structured morphology. By UV–vis spectrophotometer, it was found that the absorption of light took place in UV-region and the corresponding optical energy band-gap was observed as 4.02eV. The diffraction pattern obtained from TEM showed the crystalline nature of the material. Powder XRD revealed the minimum crystallite size as 9nm and average size as 13nm which was further confirmed by the Zeta Nano-sizer. The film was employed as transmission based opto-electronic humidity sensor. Maximum sensitivity was found as∼0.838μW/%RH. Response and recovery times were found as 31s and 76s respectively. Experiments were repeated time to time and reproducibility was found ∼96% with negligible ageing effect. The investigated sensor being optical in nature has the capability of multiplexing the information with the signal.
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