Studies on the control of ZnO nanostructures by wet chemical method and plausible mechanism

Amit Kumar Rana,Somaditya Sen,Niharika Saxena,Yogendra Kumar,Rajasree Das,Parasharam M Shirage

doi:10.1063/1.4930598

Amit Kumar Rana, Somaditya Sen + Show 4 more

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https://doi.org/10.1063/1.4930598

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Journal: AIP Advances	Publication Date: Sep 1, 2015
Citations: 20	License type: CC BY 3.0

Affiliation: Indian Institute of Technology Indore

Abstract

This research article provides a pathway of controlled growth of ZnO nano-rods, -flowers, -needles or -tubes without external chemical catalysis, via a simple wet chemical method by control of synthesis temperature. Morphological effects on structural and optical properties are studied by Ultraviolet-visible (UV-vis) spectroscopy shows slight enhancement in the band gap, with increasing synthesis temperature. Photoluminescence (PL) data indicates the existence of defect in the nanomaterials, which is more elaborately explained by schematic band diagram. A sharp and strong peak in Raman spectroscopy is observed at ∼438cm−1 is assigned to the E2high optical mode of the ZnO, indicating the wurtzite hexagonal phase with high crystallinity.

Highlights

Controlling the morphology of semiconducting nanostructures is the most important parameter for optical-electronic technological applications.[1]
We have focused on the variation of optical properties with the change in shape and size of ZnO nano structures
The film grown below 120◦C shows a more preferred orientation along (002) planes in comparison to powder samples where (101) planes have the strongest peak intensity.[13]

Summary

Introduction

Controlling the morphology of semiconducting nanostructures is the most important parameter for optical-electronic technological applications.[1]. A number of studies on the preparation technique of ZnO nanostructure are reported using wet chemical, electro-deposition, template assisted route, thermal evaporation, chemical vapor deposition (CVD) techniques, most of these techniques require sophisticated instruments to generate high temperature or high pressure. The true challenge lies in the synthesis conditions which control the crystal growth in a particular fashion to grow desired nanostructures prevention of cluster formation. This complex growth mechanism is mostly explained based on catalyst-driven mechanisms (solution-liquid solid[6,7] and vapor-solid-solid[8] growth) and vapor-liquid-solid (VLS)[9,10] mechanism. We have focused on the variation of optical properties with the change in shape and size of ZnO nano structures

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Results

Conclusion