期刊
NANO LETTERS
卷 11, 期 2, 页码 348-354出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl1042006
关键词
Photoacoustic imaging; silica-coated gold nanorods; photoacoustic nanoamplifiers; medical and biological imaging; contrast agents
类别
资金
- National Institutes of Health [CA149740, EB008101]
- National Science Foundation [0821312]
- Division Of Chemistry
- Direct For Mathematical & Physical Scien [0821312] Funding Source: National Science Foundation
Photoacoustic signal generation by metal nanopartides relies on the efficient conversion of light to heat, its transfer to the environment, and the production of pressure transients. In this study we demonstrate that a dielectric shell has a strong influence on the amplitude of the generated photoacoustic signal and that silica-coated gold nanorods of the same optical density are capable of producing about 3-fold higher photoacoustic signals than nanorods without silica coating. Spectrophotometry measurements and finite difference time domain (FDTD) analysis of gold nanorods before and after silica coating showed only an insignificant change of the extinction and absorption cross sections, hence indicating that the enhancement is not attributable to changes in absorption cross section resulting from the silica coating. Several factors including the silica thickness, the gold/silica interface, and the surrounding solvent were varied to investigate their effect on the photoacoustic signal produced from silica-coated gold nanorods. The results suggest that the enhancement is caused by the reduction of the gold interfacial thermal resistance with the solvent due to the silica coating. The strong contrast enhancement in photoacoustic imaging, demonstrated using phantoms with silica-coated nanorods, shows that these hybrid particles acting as photoacoustic nanoamplifiers are high efficiency contrast agents for photoacoustic imaging or photoacoustic image-guided therapy.
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