Comparative Study on Morphology, Structural and Optical Properties of Non-seeded and Seeded ZnO Nanorods R. M. Akhir, S. Z. Umbaidilah, N. A. Abdullah, I. Buniyamin, M. Rusop, and Z. Khusaimi Abstract Comparative analysis on morphological, structural, and optical between zinc oxide (ZnO) nanorods on unseeded and seeded glass substrates was estimated. Both samples were synthesized by simple solution immersion method and annealed at 500 °C for 1 h. The morphological, structural, and optical properties of the investigated ZnO nanorods were characterized using Field Emission Scanning Elec- tron Microscopy (FESEM), X-Ray diffraction (XRD) spectroscopy, and Ultraviolet- Visible Spectroscopy (UV-vis), respectively. Average diameter size of ZnO on seeded glass substrates calculated from FESEM was 90 nm, four-fold smaller from the sample on the non-seeded layer. The wurtzite ZnO showed rod arrays morphology. It was found out that the (002) peak is the most dominant, indicating that the ZnO grows preferentially along the c-axis. No other peaks are suggesting that no impu- rities other than pure ZnO were obtained. The optical band gaps of seeded glass substrates ZnO nanorods decreased to 3.48 eV. High crystalline of ZnO nanorods on seeded glass substrate was achieved and can be beneficial for optoelectronics application. Keywords Zinc oxide · Nanorods · Solution-immersion · FESEM · XRD · UV-Vis R. M. Akhir (B ) · S. Z. Umbaidilah · N. A. Abdullah · I. Buniyamin · M. Rusop · Z. Khusaimi Center for Functional Materials and Nanotechnology, Institute of Science, Universiti Teknologi MARA, 40450 Shah Alam, Selangor, Malaysia e-mail: rabiatul9581@uitm.edu.my R. M. Akhir · S. Z. Umbaidilah · N. A. Abdullah · Z. Khusaimi Faculty of Applied Sciences, Universiti Teknologi MARA, 40450 Shah Alam, Selangor, Malaysia M. Rusop NANO-Electronic Centre, Faculty of Electrical Engineering, Universiti Teknologi MARA, 40450 Shah Alam, Selangor, Malaysia © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2021 Recent Trends in Manufacturing and Materials Towards Industry 4.0, Lecture Notes in Mechanical Engineering, https://doi.org/10.1007/978-981-15-9505-9_84 961