The transformation of ZnO submicron dumbbells into perfect hexagonal tubular structures using CBD: a post treatment route

Abstract

In this paper, we report the synthesis of dumbbell-shaped ZnO structures and their subsequent transformation into perfect hexagonal tubes by the extended chemical bath deposition (CBD) method, retaining all advantages such as reproducibility, simplicity, quickness and economical aspect. Well-dispersed sub-micron-sized dumbbell-shaped ZnO structures were synthesized on a SiO2/Si substrate by the CBD method. As an extension of the CBD process the synthesized ZnO dumbbells were exposed to the evaporate coming out of the chemical bath for a few minutes (simply by adjusting the height of the deposit so that it remained just above the solution) to convert them into hexagonal tubes via the dissolution process. The possible dissolution mechanism responsible for the observed conversion is discussed. The optical properties (photo-luminescence) recorded at low temperature on both the structures showed an intense, sharp excitonic peak located at ∼370 nm. The improved intensity and low FWHM of the UV peak observed in the hexagonal tubular structures assures high optical quality, and hence can be used for optoelectronic applications.

Ag nanoparticles on ZnO nanoplates as a hybrid SERS-active substrate for trace detection of methylene blue

“…37,38 ZnO nanostructures from pure to hybrid structures have been developed as SERS substrates due to their non-toxicity and biocompatibility. 10,15,16 In order to meet the demands of their applications, a wide range of morphologies of ZnO semiconductor nanostructures, including nanowire, 39,40 nanodome, 10 nanoplate, 41 nanorod, 42,43 nanoparticle, 25,44 dumbbell, 45 nanotube, 46,47 and hexagon, 30 have been developed. Semiconductor-based SERS substrates are generally less efficient than noble metal substrates.…”

Photocatalytic performance of ZnO carbon composites for the degradation of methyl orange dye

“…Presence of -OH and C=O groups on the surface of CS make it hydrophilic in nature [38]. Herewith we propose that Zn 2+ produced during synthesis of ZnO using an aqueous solution of Zn(CH 3 COO) 2 can get coupled with such active sites especially where -OH group is present due to the electrostatic interactions [32,35,[39][40][41]. The Zn 2+ ions coupled at the surface of CS further reacts with the OH − ion present in the reaction solution to produce Zn(OH) 2 at the CS surface.…”

“…The detailed experimental procedure regarding synthesis of CS is reported elsewhere [31]. With prior structural and optical characterization CS synthesized were used for producing Z-CS composites by adopting ecofriendly chemical bath route [32]. For Z-CS synthesis, CS (varying weight as 10, 50, 100 and 300 mg respectively) were well dispersed in 50 ml DI water.…”