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Growth, structural and electrical properties of VO2/ZnO nanostructures

10th International Conference on Emerging Materials and Nanotechnology

July 27-29, 2017 Vancouver, Canada

Sang-Wook Han, In-Hui Hwang, Zhenlan Jin and Chang-In Park

Jeonbuk National University, Korea

ScientificTracks Abstracts: Res. Rev. J Mat. Sci

DOI: 10.4172/2321-6212-C1-002


VO2 is a typical metal-insulator-transition (MIT) material with the bandgap of ~0.7 eV and the Tc of ~ 70oC. VO2 is transparent and dark below and above the Tc, so that it can be applicable for smart windows by controlling the temperature. VO2 nanoparticles in a metallic phase block and scatter sunlight. The scattered sunlight by VO2 nanoparticles can be used in solar cells. We examined the local structural and electrical properties from VO2/ZnO nanostructures by using the simultaneous measurements of X-ray absorption fine structure (XAFS) and resistance. The structural and electrical properties of VO2 depend on the length of ZnO nanorods underneath VO2. Direct comparison of simultaneously-measured resistance and XAFS from the VO2 demonstrates that the transitions of structures, local density of the V 3d orbital states, and resistance occurred in sequence during heating, whereas the properties changed simultaneously during cooling. XAFS reveals a substantial increase of Debye-Waller factors, particularly, V-V pairs along the {111} direction in the metallic phase. XAFS results indicate that soft phonon above Tc plays a critical role in the collapse of a small band gap of VO2. The local structural and the electrical properties of VO2/ZnO nanorods are considerably sensitive to the interface of VO2/ZnO as well as the length of ZnO nanorods. The interface properties of VO2 hetero-structures should be considered for its applications to smart windows and solar cells.


Sang-Wook Han has published over 70 research papers in Solid State Physics, Nanoscience, and Nanotechnology and given over 30 invited lectures. His major research field is the micro-structural and chemical property characterizations of nanomaterials using X-ray absorption fine structure (XAFS) and nanomaterial applications including sensors, battery, and solar cells. helps to translate Spanish to English and English to Spanish for free. kullanarak 100'den fazla dil ciftinde hemen ceviriler yapabilirsiniz.ingilizce turkce ceviri helps to translate English to Spanish to English for free. ingilizce turkce ceviri, turkce ingilizce ceviri, ingilizce turkce cumle ceviri, ingililizceyi turkceye ceviri ve turkceyi ingilizceye ceviri gibi tum dillerde dogru ceviri hizmetleri sunuyor. kullanarak 100'den fazla dil ciftinde hemen ceviriler yapabilirsiniz.ingilizce turkce ceviri