Analysis of scattering effect on ZnO nanorods coated glass substrate towards humidity

Roslan, Muhammad Hakimi (2024) Analysis of scattering effect on ZnO nanorods coated glass substrate towards humidity. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

ZnO is one of sensitive materials utilized in optical sensors for humidity detection. However, previous researchers only presented their work either on forward or backward scattering in measuring modulation of light in response towards humidity sensing. This project presented valuable findings for researchers in selecting specific scattering direction towards better sensing performance in developing humidity sensing device. In this project, several glass substrates coated with ZnO nanorods for 3 h, 6 h and 9 h of growth durations via hydrothermal approach. The project utilized a 3D-printed sensor setup which consists of an LED and two photodiodes which served as light source and light detectors, correspondingly. The successful fabricated glass substrate was placed in glass holder on 3D-printed sensing device that aligned between the LED and one of the photodiodes. The photodiode served as the measurement of backward scattering by the ZnO nanorods. Another photodiode was placed as closed as possible at the tip of the ZnO nanorods which served as forward scattering measurement. The setup was placed in a controlled chamber which humidity was increased from 30% to 90% of RH levels and the measurement were done on all samples with different growth durations. It was found that the ZnO characteristics towards humidity levels was dominated by backward scattering across all samples of 3 h, 6 h and 6 h of growth times. The maximum reduction of 240 mV was observed on the backward scattering by sample with growth time of 9 h with sensitivity of 3.3 mV/% for the measurement of relative humidity from 30% to 90%.

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