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Phase, microstructural analysis, and humidity-sensing properties of orange dye and cuprous-oxide composite

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Abstract

The effect of humidity on the phase, microstructure, and electrical properties of an organic compound orange dye (C17H17N5O2) and cuprous-oxide (Cu2O) micro-composite thin film has been investigated. 5 wt% commercially available orange dye and 30–40 wt% Cu2O were used to prepare an aqueous solution. The solution was layered in the form of a thin film on a pre-deposited copper glass substrate using a drop-casting technique under normal gravity conditions. A gap was made in the middle of the surface to get ohmic type electrodes at the ends of the glass substrate. In this way, a Cu/Cu2O–OD/Cu humidity sensor was fabricated. A self-made setup was used to carry out the experiment. Impedance of these samples was observed to decrease by 57–84 times and capacitance increased by 20–26 times with an increase in humidity from 62 to 98% RH. These observations demonstrated that impedance was more sensitive to the variations in humidity as compared to capacitance.

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Acknowledgements

The authors are thankful to the authority of GIK Institute for the support of research in the area of organic semiconductor and devices fabrication and investigations. The authors also acknowledge the financial support (ADP No. 130314) extended by the KPK Govt. through DoST, KPK for the Materials Research Laboratory, University of Peshawar.

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Authors and Affiliations

  1. GIK Institute of Engineering Sciences and Technology, Topi, District Swabi, KPK, 23640, Pakistan

    Khasan S. Karimov & Noshin Fatima

  2. Center for Innovative Development of Science and New Technologies of Academy of Sciences of Tajikistan, Dushanbe, 734025, Pakistan

    Khasan S. Karimov

  3. Government College of Science, Wahdat Road, Lahore, 54570, Pakistan

    Muhammad Saleem

  4. Materials Research Laboratory, Department of Physics, University of Peshawar, Peshawar, Pakistan

    Yaseen Iqbal & Rashid Gohar

  5. Capital University of Science and Technology, Islamabad, Pakistan

    Noshin Fatima

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  1. Khasan S. Karimov
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Correspondence to Muhammad Saleem.

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Karimov, K.S., Saleem, M., Iqbal, Y. et al. Phase, microstructural analysis, and humidity-sensing properties of orange dye and cuprous-oxide composite. Appl. Phys. A 123, 740 (2017). https://doi.org/10.1007/s00339-017-1343-1

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  • DOI: https://doi.org/10.1007/s00339-017-1343-1

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