Hierarchical Assembly of ZnO Nanostructures on SnO₂ Backbone Nanowires: Low-Temperature Hydrothermal Preparation and Optical Properties

Abstract

Hierarchical nanostructures with SnO(2) backbones and ZnO branches are successfully prepared in a large scale by combining the vapor transport and deposition process (for SnO(2) nanowires) and a hydrothermal growth (for ZnO). The ZnO nanorods grow epitaxially on the SnO(2) nanowire side faces mainly with a four-fold symmetry. The number density and morphology of the secondary ZnO can be tailored by changing the precursor concentration, reaction time, and by adding surfactants. Photoluminescence (PL) properties are studied as a function of temperature and pumping power. Such hybrid SnO(2)-ZnO nanostructures show an enhanced near-band gap emission compared with the primary SnO(2) nanowires. Under the optical excitation, a UV random lasing is observed which originates from the hierarchically assembled ZnO branches. These three-dimensional nanostructures may have application potentials as chemical sensors, battery electrodes, and optoelectronic devices.

Hydrothermally Synthesis Nanostructure ZnO Thin Film for Photocatalysis Application

“…Raman scattering can give evidence about the crystal structure on the scale of a few lattice constants. Therefore, Raman spectroscopic technique is one of the useful methods to achievement deep into the nanostructure structural [33]. The sharp peak at 438 cm -1 corresponding to E 2 (low) and E 2 (high) are characteristic of hexagonal wurtzite structure of high crystalline quality (Fig.5).…”

Brush-like SnO2/ZnO hierarchical nanostructure: Synthesis, characterization and application in UV photoresponse

“…Some reasons were proposed to explain such phenomenon: First, the ZnO nanorods may compensate the defects on the surface of the SnO 2 nanowire. 32 Second, SnO 2 is surrounded by ZnO nanorod, the excitation light was almost absorbed by the ZnO nanorods. Third, the PL from the SnO 2 nanowires is much weaker than that from ZnO nanorods, so the PL peak from the SnO 2 can not emerge out.…”

“…[26][27][28][29][30][31] Because of similar bandgap and optoeletronics functions of ZnO and SnO 2 , hybrid ZnO/SnO 2 threedimensional hierarchical nanostructures were fabricated and investigated. [32][33][34] Cheng et al reported hierarchical nanostructures composed by SnO 2 backbones and ZnO branches, random lasing was observed from the ZnO branches where the multiscattering was easy to be generated. 32 Liu et al reported flower-like hierarchical structures with ZnO backbones and SnO 2 branches using chemical method.…”

“…[32][33][34] Cheng et al reported hierarchical nanostructures composed by SnO 2 backbones and ZnO branches, random lasing was observed from the ZnO branches where the multiscattering was easy to be generated. 32 Liu et al reported flower-like hierarchical structures with ZnO backbones and SnO 2 branches using chemical method. 34 Due to the high surface-volume ratio, the hierarchical 3-D nanostructures can show better optical property and sensing ability than the tradional 1-D nanostructure.…”

Recent Development of Advanced Electrode Materials by Atomic Layer Deposition for Electrochemical Energy Storage

“…Another advantage of ALD is its relatively low deposition temperature. Compared with conventional CVD techniques that are often conducted in the temperature range of 600–1050 °C,7 ALD can be run in temperatures below 300 °C. In addition, some materials can be effectively deposited below 100 °C or even at room temperature 8.…”