Growth and Characterization of Au-Catalyzed SnO2 Nanowires by Resistive Thermal Evaporation: Methanol Sensing
R. Rakesh Kumar*, K. Narasimha Rao, K. Rajanna
Indian Institute of Science
Myself I am Rakesh Kumar Rajaboina, Presently, I'm a Research Associate working with Dr. K. Narasimha Rao and Prof. K. Rajanna at the Department of Instrumentation and Applied Physics, Indian Institute of Science,
My thesis work on “Growth and characterization of semiconductor and metal oxide nanowires by simple evaporation methods. I have finished my masters from M. Sc (Physics) (May - 2008) from Dept. of Physics, Osmania University, Hyderabad, India. My Research Interests includes Growth of nanowires by simple electron beam and thermal evaporation methods, Understanding the growth of nanostructures by vapor transport method, Application of nanostructured materials for sensors and solar cells and rechargeable Li – ion battery applications and Fabrication of nanoscale devices based on nanostructured materials.
Crystalline SnO2 NWs were grown by simple resitive thermal evaporation at a low substrate temperature of 450 °C. Growth of the NWs carried via Au Assisted VLS mechanism. Nanowires were grown uniformly throughout the substrate and were vertical with respect to the substrate with an average length and diameter of 2-2.5 µm and 30-80 nm, respectively. XRD and TEM studies confirm the crystalline nature of the NWs. The EDS measurements on the NWs confirms the formation of SnO2 (Sn (31): O (68) At%). SnO2 NWs films showed good response to methanol at an operating temperature of 450 °C. The operating temperature can be further reduced by controlling the structure of NWs by using different catalyst for the growth of SnO2 NWs and by volumetric doping of these NWs with catalysts such as Au, Pd, and Pt in to the NWs.