Structural transformations in CdSe nanocrystals are studied using high pressure x‐ray diffraction and high pressure optical absorption at room temperature. The nanocrystals undergo a wurtzite to rock salt transition analogous to that observed in bulk CdSe. Both the thermodynamics and the kinetics of the transformation, however, are significantly different in finite size. The nanocrystal phase transition pressures vary from 3.6 to 4.9 GPa for crystallites ranging from 21 to 10 Å in radius, respectively, in comparison to a value of 2.0 GPa for bulk CdSe. The size dependent data can be modeled using thermodynamics when surface energies are accounted for. Surface energies calculated in this way can be used to understand the dynamic microscopic path followed by atoms during the phase transition. X‐ray diffraction data also shows that unlike bulk CdSe, crystalline domain size is conserved upon multiple transition in the nanocrystals, indicating that the transition only nucleates once in each nanocrystal.
Skip Nav Destination
Article navigation
15 March 1995
Research Article|
March 15 1995
The wurtzite to rock salt structural transformation in CdSe nanocrystals under high pressure
Sarah H. Tolbert;
Sarah H. Tolbert
Materials Sciences Division, Lawrence Berkeley Laboratory
Department of Chemistry, University of California, Berkeley, California 94720
Search for other works by this author on:
A. P. Alivisatos
A. P. Alivisatos
Materials Sciences Division, Lawrence Berkeley Laboratory
Department of Chemistry, University of California, Berkeley, California 94720
Search for other works by this author on:
J. Chem. Phys. 102, 4642–4656 (1995)
Article history
Received:
September 22 1994
Accepted:
December 08 1994
Citation
Sarah H. Tolbert, A. P. Alivisatos; The wurtzite to rock salt structural transformation in CdSe nanocrystals under high pressure. J. Chem. Phys. 15 March 1995; 102 (11): 4642–4656. https://doi.org/10.1063/1.469512
Download citation file:
Sign in
Don't already have an account? Register
Sign In
You could not be signed in. Please check your credentials and make sure you have an active account and try again.
Sign in via your Institution
Sign in via your InstitutionPay-Per-View Access
$40.00
Citing articles via
CREST—A program for the exploration of low-energy molecular chemical space
Philipp Pracht, Stefan Grimme, et al.
GPAW: An open Python package for electronic structure calculations
Jens Jørgen Mortensen, Ask Hjorth Larsen, et al.
DeePMD-kit v2: A software package for deep potential models
Jinzhe Zeng, Duo Zhang, et al.