Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 2, Issue 3, Pages 228-235Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jz101716h
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Funding
- National Science Foundation
- ACS Petroleum Research [48268-G6]
- NSF [CBET 0827725]
- ONR [N00014-0-1-118]
- Directorate For Engineering [0823921] Funding Source: National Science Foundation
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1004737] Funding Source: National Science Foundation
- Div Of Chem, Bioeng, Env, & Transp Sys
- Directorate For Engineering [0827725] Funding Source: National Science Foundation
- Div Of Electrical, Commun & Cyber Sys [0823921] Funding Source: National Science Foundation
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Ultrafast pump probe spectroscopy was used to characterize coherent vibrational oscillations of hollow gold nanospheres (HCNs) composed of a polycrystalline Au shell and a hollow, solvent filled interior. Different HCN samples show heavily damped radial breathing mode oscillations with a period ranging from 28 +/- 2 to 33 +/- 3 ps. We theoretically modeled the oscillation period of HCNs while varying both the shell thicknesses and creation of a hollow cavity was predicted to increase the oscillation period relative to solid gold nanoparticles, and this result was verified experimentally. Our theoretical predictions of oscillation period are significantly lower than the experimental measurements. We propose that this difference is due to the polycrystalline nature of HCNs that softens the vibration of the lattice compared with a single-crystalline shell. We compare our system to solid Au nanoparticles and Au nanoparticle aggregates and find a general trend of longer oscillation period with increasing particle polycrystallinity.
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