Size-dependent lattice dynamics of atomically precise cadmium selenide quantum dots
- Columbia Univ., New York, NY (United States)
- Columbia Univ., New York, NY (United States); Brookhaven National Lab. (BNL), Upton, NY (United States)
- American Physical Society, Ridge, NY (United States)
- Argonne National Lab. (ANL), Argonne, IL (United States); Miami Univ., Oxford, OH (United States)
- Argonne National Lab. (ANL), Argonne, IL (United States)
Material properties depend sensitively on the atomic arrangements and atomic bonding, but these are notoriously difficult to measure in nanosized atomic clusters due to the small size of the objects and the challenge of obtaining bulk samples of identical clusters. Here we have combined the recent ability to make gram quantities of identical semiconductor quantum-dot nanoparticles with the ability to measure lattice dynamics on small sample quantities of hydrogenated materials using high energy resolution inelastic x-ray scattering (HERIX), to measure the size-dependence of the phonon density of states (PDOS) in CdSe quantum dots. The fact that we have atomically precise structural models for these nanoparticles allows the calculation of the PDOS using Density Functional Theory (DFT), providing both experimental and theoretical confirmations of the important role that the inertia of the surface capping species plays on determining the lattice dynamics.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States); Brookhaven National Laboratory (BNL), Upton, NY (United States)
- Sponsoring Organization:
- USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
- Grant/Contract Number:
- AC02-05CH11231; AC02-06CH11357; SC0012704
- OSTI ID:
- 1489740
- Report Number(s):
- BNL--210839-2019-JAAM
- Journal Information:
- Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 2 Vol. 122; ISSN 0031-9007
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Similar Records
On the size and temperature dependence of the energy gap in cadmium-selenide quantum dots embedded in fluorophosphate glasses
Effect of cadmium-selenide quantum dots on the conductivity and photoconductivity of nanocrystalline indium oxide