Growth of ZnO nano-rods and its photoconductive characteristics on the photo-catalytic properties. (2019)

• Record Type: Journal Article
• Authors: Worasawat, Suchada; Tasaki, Katsuyoshi; Hatanaka, Yoshinori; Neo, Yoichiro; Mimura, Hidenori; Pecharapa, Wisanu
• Is Part Of: Materials today. Volume 17:Part 4(2019)
• Page Start: 1379
• Page End: 1385
• Publication Date: 2019
• Subjects: ZnO nano-rods -- photoconductivity -- photo-catalysis -- Oxygen atmosphere; Materials science -- Congresses -- Periodicals; 620.1
• DOI: 10.1016/j.matpr.2019.06.158
• Languages: English
• ISSNs: 2214-7853

Abstract

Abstract: Zinc oxide (ZnO) nano-rods has widely been investigated as a promising material for photo-catalysis, due to its high photocatalytic activity for the ambient gas molecules. Well-aligned ZnO nano-rods arrays were obtained by the two steps growth. Firstly, seeding layer deposition by RF magnetron sputtering, and secondly, nano-rods growth by hydrothermal processes were investigated. Moreover, after the samples were annealed at 450 °C, these samples were compared in crystalline characteristics and photo-electronic characteristics. The morphology of grown ZnO nano-rods were observed as the hexagonal nano-rods and XRD shows a (002) orientation in wurtzite crystals structure. Annealing processes shows a remarkable improvement of crystallinity. PL measurements showed a steep band edge emission and broad defect states emission and also fairly improvement in crystalline properties by the annealing process. The photoconductivity measurement could lead to investigate the photo-catalytic phenomena on the surface of ZnO nano-rods against the environmental gas molecules. The annealed samples showed a higher photo-conductivity and surface activity for the oxygen gas molecules comparing to the as grown samples.