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Issue 6, 2015
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Nanoscale interface engineering in ZnO twin nanorods for proposed phonon tunnel devices

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Abstract

Zinc oxide twin nanorods, with two identical crystalline sections connected by an amorphous layer, were reproducibly grown using a simple one-step hydrothermal technique. The thickness of the amorphous layer between the crystalline segments was tunable with growth parameters, as confirmed by high resolution transmission electron microscopy. The photoluminescence spectra of these twin nanorods exhibit strong near band edge emission in the UV range, with convoluted phonon sidebands. De-convolution analyses of these spectra showed that the amorphous interlayers act as effective phonon barriers beyond a certain thickness. Such oriented grown individual crystalline–amorphous–crystalline structures may be a suitable test system for fundamental studies of phonon tunneling in the nanostructure. While physical vapor deposition techniques are seriously constrained in realizing crystalline–amorphous–crystalline structures, our results show the viability of engineering embedded interfaces via chemical routes.

Graphical abstract: Nanoscale interface engineering in ZnO twin nanorods for proposed phonon tunnel devices

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Article information


Submitted
18 Nov 2014
Accepted
23 Dec 2014
First published
24 Dec 2014

Phys. Chem. Chem. Phys., 2015,17, 4277-4282
Article type
Paper
Author version available

Nanoscale interface engineering in ZnO twin nanorods for proposed phonon tunnel devices

A. Singh, K. Senapati, B. Satpati, M. Kumar and P. K. Sahoo, Phys. Chem. Chem. Phys., 2015, 17, 4277
DOI: 10.1039/C4CP05369A

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