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Ultrafast laser studies of the photothermal properties of gold nanocages
被引:91
作者:
Hu, M
Petrova, H
Chen, JY
McLellan, JM
Siekkinen, AR
Marquez, M
Li, XD
Xia, YN
[1
]
Hartland, GV
机构:
[1] Univ Washington, Dept Chem, Seattle, WA 98195 USA
[2] Philip Morris Inc, Res Ctr, INEST Grp, Richmond, VA 23234 USA
[3] Univ Notre Dame, Dept Chem & Biochem, Notre Dame, IN 46556 USA
[4] NIST, NCTCN Ctr, Phys & Chem Properties Div, Gaithersburg, MD 20899 USA
[5] Univ Washington, Dept Bioengn, Seattle, WA 98195 USA
关键词:
D O I:
10.1021/jp0571628
中图分类号:
O64 [物理化学(理论化学)、化学物理学];
学科分类号:
070304 ;
081704 ;
摘要:
An nanocages were synthesized via a galvanic replacement reaction. The extinction peak of these hollow structured particles is shifted into the near-IR compared with the Ag nanocube templates. Energy transfer from the An nanocages into the surrounding environment (water) as well as the coherently excited vibrational modes of the nanocages were studied by femtosecond pump-probe spectroscopy. The time scale for energy relaxation was found to increase with the size of the particles, with the relaxation time being independent of the laser intensity. The time scales for relaxation are comparable to those for solid spherical gold particles and are consistent with energy relaxation being controlled by heat dissipation in the solvent. The period of the coherently excited vibrational mode is proportional to the dimensions of the nanocages. Intensity-dependent measurements show that in solution the nanocages maintain their integrity up to lattice temperatures of I 1100 +/- 100 K.
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页码:1520 / 1524
页数:5
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