Implementation of an IoT-based Dip Coating System for The Fabrication of ZnO Thin Film
Abstract
Md. Mahmudul Hasan, Md. Faruk Hossain* and Mariful Islam Prenon
An Internet of Things (IoT) based dip coating system was developed in this research to produce a uniform thin film. The dip-coater consisted of an IoT-based microcontroller (ESP32), a Nema 17 stepper motor, and certain low-cost recyclable elements. The range discovered for dipping and withdrawal speed was 1 to 100 mm/min without disturbances caused by vibrations. The total expenditure for the development of the dip coater based on IoT was below one hundred dollars. Thin films of ZnO (Zinc Oxide) were successfully deposited on glass substrates. Different dip coater performances were investigated and compared with the designed IoT-based dip coater. The dipping process was performed 5 times with the same concentrations of 1M to achieve the desired film thickness. X-ray diffraction (XRD) analysis revealed that ZnO possesses the hexagonal Wurtzite crystal structure. As for the inspection by SEM (Scanning Electron Microscope), it was observed that uniform layers were obtained. The chemical properties were also analyzed by EDS (Energy-dispersive X-ray Spectroscopy). Over 80% optical transmittance was demonstrated by the thin films in the wavelength ranging from 380 to 800 nm. For scientist’s incapable of purchasing expensive equipment that accomplishes the same goal and delivers the same outcomes, this inexpensive equipment supports scientific advancement. In the nanoscale range, the production of thin films with uniform thickness revealed the effectiveness of the dip-coater.