Issue 23, 2017

Charge carrier concentration dependence of ultrafast plasmonic relaxation in conducting metal oxide nanocrystals

Abstract

Electronically doped metal oxide nanocrystals exhibit tunable infrared localized surface plasmon resonances (LSPRs). Despite the many benefits of IR resonant LSPRs in solution processable nanocrystals, the ways in which the electronic structure of the host semiconductor material impact metal oxide LSPRs are still being investigated. Semiconductors provide an alternative dielectric environment than metallically bonded solids, such as noble metals, which can impact how these materials undergo electronic relaxation following photoexcitation. Understanding these differences is key to developing applications that take advantage of the unique optical and electronic properties offered by plasmonic metal oxide NCs. Here, we use the two-temperature model in conjunction with femtosecond transient absorption experiments to describe how the internal temperature of two representative metal oxide nanocrystal systems, cubic WO3−x and bixbyite Sn-doped In2O3, change following LSPR excitation. We find that the low free carrier concentrations of metal oxide NCs lead to less efficient heat generation as compared to metallic nanocrystals such as Ag. This suggests that metal oxide NCs may be ideal for applications wherein untoward heat generation may disrupt the application's overall performance, such as solar energy conversion and photonic gating.

Graphical abstract: Charge carrier concentration dependence of ultrafast plasmonic relaxation in conducting metal oxide nanocrystals

Supplementary files

Article information

Article type
Paper
Submitted
07 fev 2017
Accepted
09 mar 2017
First published
10 mar 2017

J. Mater. Chem. C, 2017,5, 5757-5763

Charge carrier concentration dependence of ultrafast plasmonic relaxation in conducting metal oxide nanocrystals

R. W. Johns, M. A. Blemker, M. S. Azzaro, S. Heo, E. L. Runnerstrom, D. J. Milliron and S. T. Roberts, J. Mater. Chem. C, 2017, 5, 5757 DOI: 10.1039/C7TC00600D

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements