Issue 12, 2011

From metastable to stable: possible mechanisms for the evolution of W18O49nanostructures

Abstract

The evolution of nanoscale W18O49 from nanowires into nanosheets is investigated. FESEM and HRTEM images of self-synthesized W18O49 nanostructures obtained from sputter-deposited tungsten films after thermal annealing at various temperatures (550–900 °C) and times (0.5–3 h) are presented and discussed. W18O49 nanostructures obtained from annealed samples with sufficient thermal budgets exhibit Moiré fringes with various periodicities along the growth direction. Experimental results confirm that the evolution of nanostructures from nanowires into nanosheets can be attributed to two mechanisms. One is the formation of an amorphous buffer layer on the ([5 with combining macron]02) planes between two neighboring nanowires that facilitates twisting and/or rotation of the two wires and re-crystallization of the buffer layer. The other is the assembly of two neighboring nanowires into a quasi-single crystal by coherent their (010) planes, followed by the rolling of subgrain boundaries to form single-crystalline nanosheets.

Graphical abstract: From metastable to stable: possible mechanisms for the evolution of W18O49 nanostructures

Article information

Article type
Paper
Submitted
04 Dec 2010
Accepted
25 Mar 2011
First published
21 Apr 2011

CrystEngComm, 2011,13, 4145-4150

From metastable to stable: possible mechanisms for the evolution of W18O49 nanostructures

R. Ko, S. Wang, W. Hsu and Y. Lin, CrystEngComm, 2011, 13, 4145 DOI: 10.1039/C0CE00911C

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