Journal of Nanomedicine & Nanotechnology

Flexible transparent devices using carbon nanotubes

3^rd International Conference on Nanotek & Expo

December 02-04, 2013 Hampton Inn Tropicana, Las Vegas, NV, USA

Nuria Ferrer-Anglada

Accepted Abstracts: J Nanomed Nanotechnol

Abstract:

Flexible conducting thin films are useful in flexible electronic devices for different applications as sensors, transistors or flexible electrodes. We prepare thin single walled carbon nanotube networks on a transparlent and flexible substrate with different densities. We measure the electric impedance at different frequencies Z (f) in the frequency range from 40 Hz to 20 GHz. We measure the optical absorption and electrical conductivity in order to optimize the conditions for obtaining optimum performance films with both high electrical conductivity and transparency. We observe a square resistance from 8,5 to 1 kOhm for samples showing 85% to 65% optical transmittance respectively. For some applications we need flexibility and not transparency: for this purpose we deposit a thick film of single walled carbon nanotubes on a flexible silicone substrate by spray, from an aqueous suspension of carbon nanotubes in a surfactant (SDS), obtaining a flexible conducting electrode, showing an electrical resistance as low as 200 Ohm/square. On stretching up to 10% and 20% the electrical resistance increases slightly, recovering the initial value for small elongations. We analyze the stretched and non stretched samples by Raman spectroscopy and observe that Raman spectra breathing mode is highly sensitive to stretching. The high energy Raman modes do not change, which indicates that no defects are introduced when stretching. Using this method, conducting flexible films, that could be transparent, can be deposited on any kind and shape of surface. In particular they can be used as a support for selective sensors.

Biography :

Nuria Ferrer-Anglada did Doctor in Physics from the University of Barcelona (Spain) and Doctor in Solid State Physics from the University Paul Sabatier (Toulouse, France), and did different post doctoral studies at the University of London Queen Mary College (U.K.) and Max Planck Institute of Stuttgart (D). She is Professor of Physics at the Polytechnic University of Catalonia (UPC) in Barcelona, teaching physics at the Telecommunications Engineering High School. She has published more than 35 papers in reputed indexed journals