Please use this identifier to cite or link to this item: https://doi.org/10.1063/1.3480558
Title: Integrating in situ high pressure small and wide angle synchrotron x-ray scattering for exploiting new physics of nanoparticle supercrystals
Authors: Wang, Z.
Chen, O.
Cao, C.Y.
Finkelstein, K.
Smilgies, D.-M.
Lu, X. 
Bassett, W.A.
Issue Date: Sep-2010
Citation: Wang, Z., Chen, O., Cao, C.Y., Finkelstein, K., Smilgies, D.-M., Lu, X., Bassett, W.A. (2010-09). Integrating in situ high pressure small and wide angle synchrotron x-ray scattering for exploiting new physics of nanoparticle supercrystals. Review of Scientific Instruments 81 (9) : -. ScholarBank@NUS Repository. https://doi.org/10.1063/1.3480558
Abstract: Combined small and wide angle synchrotron x-ray scattering (SAXS and WAXS) techniques have been developed for in situ high pressure samples, enabling exploration of the atomic structure and nanoscale superstructure phase relations. These studies can then be used to find connections between nanoparticle surfaces and internal atomic arrangements. We developed a four-axis control system for the detector, which we then employed for the study of two supercrystals assembled from 5 nm Fe3 O4 and 10 nm Au nanoparticles. We optimized the x-ray energy and the sample-to-detector distance to facilitate simultaneous collection of both SAXS and WAXS. We further performed in situ high pressure SAXS and WAXS on a cubic supercrystal assembled from 4 nm wurtzite-structure CdSe nanoparticles. While wurtzite-structure CdSe nanoparticles transform into a rocksalt structure at 6.2 GPa, the cubic superstructure develops into a lamellarlike mesostructure at 9.6 GPa. Nanoparticle coupling and interaction could be enhanced, thus reducing the compressibility of the interparticle spacing above ∼3 GPa. At ∼6.2 GPa, the wurtzite-to-rocksalt phase transformation results in a noticeable drop of interparticle spacing. Above 6.2 GPa, a combined effect from denser CdSe nanoparticle causes the interparticle spacing to expand. These findings could be related to a series of changes including the surface structure, electronic and mechanical properties, and strain distribution of CdSe under pressure. This technique opens the way for exploring the new physics of nanoparticles and self-assembled superlattices. © 2010 American Institute of Physics.
Source Title: Review of Scientific Instruments
URI: http://scholarbank.nus.edu.sg/handle/10635/89254
ISSN: 00346748
DOI: 10.1063/1.3480558
Appears in Collections:Staff Publications

Show full item record
Files in This Item:
There are no files associated with this item.

SCOPUSTM   
Citations

34
checked on Jul 14, 2018

WEB OF SCIENCETM
Citations

30
checked on Jun 19, 2018

Page view(s)

40
checked on May 18, 2018

Google ScholarTM

Check

Altmetric


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.