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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
XRD patterns of (a) the WO3 nanospheres (ICDD Card No. 00-043-0679) and (b) WO3 nanorods (ICDD Card No. 01-072-0199) and 3D chemical structure for the (c) WO3 nanospheres and (d) WO3 nanorods.