Jump to main content
Jump to site search
Access to RSC content Close the message box

Continue to access RSC content when you are not at your institution. Follow our step-by-step guide.


Issue 18, 2014
Previous Article Next Article

Optical properties of PbS nanocrystal quantum dots at ambient and elevated pressure

Author affiliations

Abstract

We investigated pressure-dependent changes in the optical properties of PbS nanocrystal quantum dots (NQD) by combining X-ray scattering and optical absorption spectroscopy in a diamond anvil cell. We discovered that the excitonic absorption peak vanishes as the NQD crystal structure reversibly undergoes the pressure-induced phase transition from rock-salt to orthorhombic structure. In the rock-salt phase, the pressure coefficient Image ID:c4cp00395k-t1.gif of PbS NQD is negative and decreases in magnitude with decreasing NQD size. The basic theoretical model based on literature values of the PbS bulk modulus significantly overestimated the change in pressure coefficient with NQD size. We present a model that includes the size-dependence of both the pressure coefficient and bulk modulus to describe the experimentally observed optical and structural trends.

Graphical abstract: Optical properties of PbS nanocrystal quantum dots at ambient and elevated pressure

Back to tab navigation

Supplementary files

Article information


Submitted
26 Jan 2014
Accepted
10 Mar 2014
First published
10 Mar 2014

Phys. Chem. Chem. Phys., 2014,16, 8515-8520
Article type
Paper
Author version available

Optical properties of PbS nanocrystal quantum dots at ambient and elevated pressure

K. Bian, B. T. Richards, H. Yang, W. Bassett, F. W. Wise, Z. Wang and T. Hanrath, Phys. Chem. Chem. Phys., 2014, 16, 8515
DOI: 10.1039/C4CP00395K

Social activity

Search articles by author

Spotlight

Advertisements