alexa Lasing And Transistor Properties Of A Single To Multiple Au:SnO2 Nanowire Devices Made By Chemical Vapor Deposition And Electron Beam Lithography Techniques
ISSN: 2169-0022

Journal of Material Sciences & Engineering
Open Access

OMICS International organises 3000+ Global Conferenceseries Events every year across USA, Europe & Asia with support from 1000 more scientific Societies and Publishes 700+ Open Access Journals which contains over 50000 eminent personalities, reputed scientists as editorial board members.

Open Access Journals gaining more Readers and Citations

700 Journals and 15,000,000 Readers Each Journal is getting 25,000+ Readers

This Readership is 10 times more when compared to other Subscription Journals (Source: Google Analytics)

Share This Page

Additional Info

Loading Please wait..

3rd International Conference and Exhibition on Materials Science & Engineering
October 06-08, 2014 Hilton San Antonio Airport, USA

Bonex W Mwakikunga, David Motaung, Gugu Mhlongo, Suprakas Sinha Ray, Irina Giebelhaus, Trilok Singh, Sanjay Mathur, Ching-Han Wu, Yi-Chang Li, Chi-Tin Lin, Yin-Wei Cheng and Chuan-Pu Liu
ScientificTracks Abstracts: J Material Sci Eng
DOI: 10.4172/2169-0022.S1.014
Tin dioxide nanowires (typical diameter ~40 nm and lengths~ 4μm) grown on Au patterned alumina substrates by chemical vapor deposition were isolated onto fresh SiO2/Si substrate. The isolation was accomplished by attracting single nanowires to a 200-nm glass tip under a microscope onto the Au/Ti patterned SiO2/Si substrates as well as TEM grids. TEM confirms that the nanowires are core-shell structures of [email protected]:SnO2. When excited by electrons in the cathodoluminescence mode of SEM, these nanowires emit sharp lines (FWHM~6 nm) centred at a wavelength of around 694 nm. The width of the lines and the absence of other emission wavelengths suggest that the nanowires are acting as nano-lasers. Simple lasing mechanisms are suggested. A single nanowire device with four Au/Ti contact along its length and Au/Ti gate electrode on its side shows Ohmic resistance (~109 Ω and resistivity of ~) on its four contacts although the current-voltage characteristics show steps which are symptomatic of quantized conductance confirming the quantized hopping of charge carriers characteristic of the nanoscale. The drain current decreases as the gate voltage is swept from -5V to +5V in a manner expected in lateral-gate FET but revealing both enhancement mode and depletion mode of MOSFET characteristics when drain-source polarities are reversed. The transconductance is still low but this is attributed to the large gate-channel distance. The talk will also review recent gas sensing activities with these and similar nano-structures and the issues of specificity/ selectivity centred around material band gaps and operating temperatures.
Bonex Mwakikunga completed his MSc and PhD on nanowires from the University of the Witwatersrand in Johannesburg, South Africa in 2009. His post-doctoral studies around the use of lasers to manufacture nanowires were undertaken at the Council for Scientific and Industrial Research (CSIR) in the division of National Laser Centre. He is currently leading an Advanced Materials for Device Applications (AMDA) group in the CSIR National Centre for Nano-Structured Materials. He has published more than 50 papers in reputed journals, three book chapters, graduated more than seven MSc and PhD students and has more than seven collaborating countries.
image PDF   |   image HTML

Relevant Topics

Peer Reviewed Journals
Make the best use of Scientific Research and information from our 700 + peer reviewed, Open Access Journals
International Conferences 2017-18
Meet Inspiring Speakers and Experts at our 3000+ Global Annual Meetings

Contact Us

© 2008-2017 OMICS International - Open Access Publisher. Best viewed in Mozilla Firefox | Google Chrome | Above IE 7.0 version