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Nanomaterials 2017, 7(9), 266; doi:10.3390/nano7090266

Growth Method-Dependent and Defect Density-Oriented Structural, Optical, Conductive, and Physical Properties of Solution-Grown ZnO Nanostructures

Division of Electronics and Electrical Engineering, Dongguk University-Seoul, Seoul 04620, Korea
Author to whom correspondence should be addressed.
Received: 1 August 2017 / Revised: 28 August 2017 / Accepted: 7 September 2017 / Published: 10 September 2017
(This article belongs to the Special Issue ZnO and TiO2 Based Nanostructures)
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It is time for industry to pay a serious heed to the application and quality-dependent research on the most important solution growth methods for ZnO, namely, aqueous chemical growth (ACG) and microwave-assisted growth (MAG) methods. This study proffers a critical analysis on how the defect density and formation behavior of ZnO nanostructures (ZNSs) are growth method-dependent. Both antithetical and facile methods are exploited to control the ZnO defect density and the growth mechanism. In this context, the growth of ZnO nanorods (ZNRs), nanoflowers, and nanotubes (ZNTs) are considered. The aforementioned growth methods directly stimulate the nanostructure crystal growth and, depending upon the defect density, ZNSs show different trends in structural, optical, etching, and conductive properties. The defect density of MAG ZNRs is the least because of an ample amount of thermal energy catered by high-power microwaves to the atoms to grow on appropriate crystallographic planes, which is not the case in faulty convective ACG ZNSs. Defect-centric etching of ZNRs into ZNTs is also probed and methodological constraints are proposed. ZNS optical properties are different in the visible region, which are quite peculiar, but outstanding for ZNRs. Hall effect measurements illustrate incongruent conductive trends in both samples. View Full-Text
Keywords: ZnO; defects; structural properties; convection; microwave; nanostructures; hydrothermal ZnO; defects; structural properties; convection; microwave; nanostructures; hydrothermal

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Rana, A.H.S.; Lee, J.Y.; Shahid, A.; Kim, H.-S. Growth Method-Dependent and Defect Density-Oriented Structural, Optical, Conductive, and Physical Properties of Solution-Grown ZnO Nanostructures. Nanomaterials 2017, 7, 266.

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