Microwave irradiation assisted rapid growth of ZnO nanorods over metal coated/electrically conducting substrate

Brahma, S and Shivashankar, SA (2020) Microwave irradiation assisted rapid growth of ZnO nanorods over metal coated/electrically conducting substrate. In: Materials Letters, 264 .

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Abstract

In-spite of intense research in the growth of ZnO over the years, the direct crystallization of ZnO on a metal coated/electrically conducting substrate by a solution growth process has not been carried out. We report one pot, low temperature (�100 °C) and rapid growth (5 min) of ZnO nanorods over an electrically conducting substrate by using microwave irradiation assisted thin film deposition in a liquid medium without the use of any seed layer. High density (2 � 109/cm2), c-axis oriented, uniform and continuous ZnO nanorod films are grown over Cr/Si chromium coated Si(1 0 0) and ITO/glass (indium tin oxide coated glass) substrates whereas aluminium (Al) and gold (Au) coated Si yield non uniform film with mixed texture. Microwave irradiation for 5 min ensures strongly oriented growth of ZnO over Cr/Si and ITO/glass and mixed texture for semiconducting substrates (Si/Ge). The initial nucleation of ZnO nanorods may be due to the formation of thin amorphous oxide (Cr2O3) layer over Cr film, which subsequently changes to hydroxides (CrOH2, CrOH3) in contact with water.

Item Type:	Journal Article
Publication:	Materials Letters
Publisher:	Elsevier B.V.
Additional Information:	Copyright of this article belongs to Elsevier B.V.
Keywords:	Aluminum coatings; Coatings; Deposition; Germanium compounds; Gold coatings; II-VI semiconductors; Irradiation; ITO glass; Magnetic semiconductors; Microwave irradiation; Nanorods; Optical properties; Silicon compounds; Structure (composition); Substrates; Tellurium compounds; Temperature; Textures; Thin films; Tin oxides; Wide band gap semiconductors; Zinc oxide, Amorphous oxides; Conducting substrates; Indium tin oxide coated glass; Low temperatures; Semiconducting substrates; Solution growth; Thin-film depositions; ZnO nanorod arrays, Indium compounds
Department/Centre:	Division of Chemical Sciences > Materials Research Centre
Date Deposited:	13 Feb 2020 12:02
Last Modified:	13 Feb 2020 12:02
URI:	http://eprints.iisc.ac.in/id/eprint/64503

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