Controllable growth of well-aligned ZnO nanorod arrays by low-temperature wet chemical bath deposition method

• Published in: Applied surface science Vol. 256; no. 6; pp. 1698 - 1702
• Main Authors: Li, Qingwei, Bian, Jiming, Sun, Jingchang, Wang, Jingwei, Luo, Yingmin, Sun, Kaitong, Yu, Dongqi
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 2010; Elsevier
• Subjects: Chemical bath deposition; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Condensed matter: structure, mechanical and thermal properties; Cross-disciplinary physics: materials science; rheology; Exact sciences and technology; Nanorod arrays; Photoluminescence; Physics; ZnO; Nanorod arrays; ZnO; Chemical bath deposition; Photoluminescence; Inorganic compounds; Transition element compounds; Zinc oxide; Arrays; Nanostructured materials
• ISSN: 0169-4332; 1873-5584
• DOI: 10.1016/j.apsusc.2009.09.097

Well-aligned ZnO nanorod arrays were synthesized by low-temperature wet chemical bath deposition (CBD) method on Si substrate under different conditions. Results illustrated that dense ZnO nanorods with hexagonal wurtzite structure were vertically well-aligned and uniformly distributed on the substrate. The effects of precursor concentration, growth temperature and time on nanorods morphology were investigated systematically. The mechanism for the effect of preparation parameters was elucidated based on the chemical process of CBD and basic nucleation theory. It is demonstrated that the controllable growth of well-aligned ZnO nanorods can be realized by readily adjusting the preparation parameters. Strong near-band edge ultraviolet (UV) emission were observed in room temperature photoluminescence (PL) spectra for the samples prepared under optimized parameters, yet the usually observed defect related deep level emissions were nearly undetectable, indicating high optical quality ZnO nanorod arrays could be achieved via this easy process chemical approach at low temperature.