Extraordinary electron and phonon transport through metal-semiconductor hybrid nanocomposite: decoupling electrical and thermal conductivities for thermoelectric application Online publication date: Wed, 14-Jan-2015
by Tuhin Shuvra Basu; Mallar Ray
International Journal of Nanotechnology (IJNT), Vol. 11, No. 9/10/11, 2014
Abstract: We report a simple method involving mechanical attrition followed by hot press sintering to fabricate tablet samples consisting of silver nanoparticles (Ag NPs) dispersed in luminescent silicon nanocrystal (Si NC) matrix. A dramatic increase in current by almost six orders of magnitude is observed for this type of Si NC-Ag NP hybrid nanocomposite compared with bare Si NC-based tablets. Collective charge transport through such hybrid system exhibits unexpected and fascinating characteristics. On the other hand, a remarkable reduction in thermal conductivity by two orders of magnitude is observed in the Si NC-Ag NP nanocomposite compared with the bulk counterpart. This is due to the combined effect of reduction in thermal conductivity of individual NPs and enhanced phonon scattering at the interface. We have, therefore, successfully decoupled electrical and thermal conductivity, which is not possible in any bulk material. The huge increase in electrical conductivity with substantial reduction in thermal conductivity makes this hybrid system amenable for designing efficient thermoelectric with high thermoelectric figure of merit, which has remained a significant challenge.
Online publication date: Wed, 14-Jan-2015
Go to Inderscience Online Journals to access the Full Text of this article.
If you are not a subscriber and you just want to read the full contents of this article, buy online access here.Complimentary Subscribers, Editors or Members of the Editorial Board of the International Journal of Nanotechnology (IJNT):
Login with your Inderscience username and password:
Want to subscribe?
A subscription gives you complete access to all articles in the current issue, as well as to all articles in the previous three years (where applicable). See our Orders page to subscribe.
If you still need assistance, please email email@example.com