CaltechAUTHORS
  A Caltech Library Service

Composition Modulation of Ag_2Te Nanowires for Tunable Electrical and Thermal Properties

Yang, Haoran and Bahk, Je-Hyeong and Day, Tristan and Mohammed, Amr M. S. and Min, Bokki and Snyder, G. Jeffrey and Shakouri, Ali and Wu, Yue (2014) Composition Modulation of Ag_2Te Nanowires for Tunable Electrical and Thermal Properties. Nano Letters, 14 (9). pp. 5398-5404. ISSN 1530-6984. http://resolver.caltech.edu/CaltechAUTHORS:20141020-085723292

[img]
Preview
PDF - Supplemental Material
See Usage Policy.

490Kb

Use this Persistent URL to link to this item: http://resolver.caltech.edu/CaltechAUTHORS:20141020-085723292

Abstract

In this article, we demonstrated that composition modulation of Ag_2Te nanowires can be achieved during the self-templated transformation of Te nanowires into Ag_2Te nanowires during solution phase synthesis, which provides a mean to tune the carrier density of the Ag_2Te nanowires. Both nearly stoichiometric and Ag-rich nanowires have been synthesized, which give rise to p-type and n-type Ag_2Te nanocomposites after hot press, respectively. The electrical and thermal properties of the two kinds of samples have been measured. Theoretical modeling based on the near-equilibrium Boltzmann transport equations has been used to understand the experimental results. We found that ZT of the heavily doped n-type sample reaches 0.55 at 400 K, which is the highest ZT value reported for Ag_2Te at the same temperature mainly due to the reduced thermal conductivity by the nanostructures. Theoretical analysis on the carrier transport shows that the power factor is also very well optimized in the doped Ag_2Te sample considering the reduced carrier mobility by the nanostructures.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1021/nl502551cDOIArticle
http://pubs.acs.org/doi/abs/10.1021/nl502551cPublisherArticle
http://pubs.acs.org/doi/suppl/10.1021/nl502551cRelated ItemSupporting Information
ORCID:
AuthorORCID
Snyder, G. Jeffrey0000-0003-1414-8682
Alternate Title:Composition Modulation of Ag2Te Nanowires for Tunable Electrical and Thermal Properties
Additional Information:© 2014 American Chemical Society. Received: July 7, 2014. Revised: August 12, 2014. Published: August 26, 2014. This work is supported by the U.S. Air Force Office of Scientific Research (Award Number FA9550-12-1-0061). The electrical property measurement system is funded by DARPA/Army Research Office under the contract no. W911NF0810347.
Funders:
Funding AgencyGrant Number
Air Force Office of Scientific Research (AFOSR)FA9550-12-1-0061
Army Research Office (ARO)W911NF0810347
Defense Advanced Research Projects Agency (DARPA)UNSPECIFIED
Subject Keywords:Thermoelectric; nanowires; silver telluride; Ag_2Te; nanocomposites
Record Number:CaltechAUTHORS:20141020-085723292
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20141020-085723292
Official Citation:Composition Modulation of Ag2Te Nanowires for Tunable Electrical and Thermal Properties Haoran Yang, Je-Hyeong Bahk, Tristan Day, Amr M. S. Mohammed, Bokki Min, G. Jeffrey Snyder, Ali Shakouri, and Yue Wu Nano Letters 2014 14 (9), 5398-5404
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:50529
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:20 Oct 2014 18:43
Last Modified:18 Nov 2016 17:17

Repository Staff Only: item control page