Colloquium - Dr. Weilie Zhou

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Venue:CP 220

Three-Dimensional (3D) Nanowire Arrays: Fabricating Solar Cells and Highly Sensitive and Selective Chemical Sensors

Weilie Zhou Advanced Materials Research Institute, University of New Orleans, New Orleans, LA 70148

Devices built from three-dimensional (3D) nanoarchitectures offer a number of advantages over those based on thin-film technologies, such as collecting more solar energy to improve the efficiency, providing larger surface area to enhance the sensitivity of chemical sensors, etc. The talk will be focused on synthesis of II-VI semiconductive core/shell nanowire arrays with type II band gap alignment for photovoltaic application. Their structures, optical properties and transport measurements will be presented. On the other hand, 3D semiconductive metal oxide nanowire array with the giant surface area provides a perfect structure for 3D chemical sensor fabrication. By mimicking biological olfactory system, the 3D nanowire arrays demonstrate high sensitivity and selectivity for chemical sensor application. At the end, the 3D nanowire array for supercapacitors will be also discussed.

References 1. “Synthesis and Photovoltaic Effect of Vertically Aligned ZnO/ZnS Core/shell Nanowire Arrays” K. Wang, J. J. Chen, Z. M. Zeng, J. Tarr, Weilie Zhou, Y. Zhang, Y. F. Yan, C. S. Jiang, J. Pern, and A. Mascarenhas, Appl. Phys. Lett. 96, 123105 (2010). 2. “Direct Growth of ZnO/ZnSe Highly Mismatched Type II Core/Shell Nanowire Array on Transparent Conducting Oxide (TCO) Substrate for Potential Solar Cell Application” Kai Wang, Jiajun Chen, Weilie Zhou, Yong Zhang, John Pern, Yanfa Yan, Angelo Mascarenhas, Advanced Materials 20, 3248-3253 (2008). 3. “Growth of Monoclinic WO3 Nanowire Array for Highly Sensitive NO2 Detection”, Baobao Cao, Jiajun Chen, Xiaojun Tang and Weilie Zhou, J. Mater. Chem., 19, 2323–2327. (2009). 4. “Towards One Key to One Lock: Catalyst Modified Indium Oxide Nanoparticle Thin Film Sensor Array for Selective Gas Detection”, Kun Yao, Daniela Caruntu, Sarah Wozny, Rong Huang, Yumi H. Ikuhara, Baobao Cao, Charles J. O’Connor and Weilie Zhou, J. Mater. Chem., 22, 7308 (2012)