Adinda Mahdhury Salsabillah, Nurmala Ismawardani, Melani Fitri Anggraeni, Shiswi Pratiwi, Robi Kurniawan
ZnO Nanorod/Graphene was successfully synthesized on an ITO (Indium Tin Oxide) substrate using the hydrothermal method by varying the hydrothermal time of 1 hour, 3 hours, and 5 hours. This study was conducted to confirm the effect of hydrothermal time variations on the structure, morphology, and optical properties of ZnO Nanorod/graphene as a photodetection application. The characterizations used are X-ray diffraction (XRD), Fourier transforms infrared (FT-IR), scanning electron microscopy (SEM), UV-VIS spectrophotometry, and spectroscopic ellipsometry (SE). XRD results show ZnO NRs/Graphene has a wurtzite hexagonal phase with a dominant crystal orientation on the plane (002). Furthermore, the FTIR analysis confirmed the existence of the ZnO and graphene by Zn-O functional groups at wave numbers 598 cm cm–1 and C=C at 1670 cm–1. The results of the SEM analysis confirmed that hydrothermal time plays a role in the morphological modification of ZnO NRs/Graphene. The highest porosity value ZnO NRs/Graphene owned 67.04% with a hydrothermal time of 1 hour (ZGr 1hr). UV-Vis analysis explained that each sample had a bandgap whose width varied and whose values increased from 3.14 to 3.39 eV with the increase in the hydrothermal duration. Investigation of light absorption in the sample, analyzed by characterization of ellipsometric spectroscopy and obtained 5-hour ZnO NRs/Graphene samples showed the lowest oscillator amplitude compared to other samples, this indicates the higher absorption. ZnO/Graphene with a high crystal orientation accompanied by high optical absorption properties can be used as a strategy in optimizing performance in ZnO-based optoelectronic applications, which in theory can minimize the effects of defects which are a source of current leakage and low efficiency in optoelectronic devices. © 2025 American Institute of Physics Inc.. All rights reserved.
Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Negeri Malang, Jl. Semarang No. 5, Malang, 65145, Indonesia
