Journal
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Volume 16, Issue 46, Pages 25601-25608Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4cp04017a
Keywords
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Funding
- National Natural Science Foundation of China (NSFC) [61275153, 61320106014, 11404177]
- Natural Science Foundation of Zhejiang [LY12A04002]
- International Collaboration Program of the Natural Science Foundation of Ningbo [2010D10018, 2012A610107]
- K. C. Wong Magna Foundation of Ningbo University, China
- Australian Research Council Laureate Fellowship program [FL100100099]
- Science and Industry Endowment Fund
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Hollow sea-urchin gold nanoparticles (HSU-GNPs) were successfully prepared through a novel one-step galvanic replacement strategy, and their corresponding optical properties was studied in detail. During the synthesis process, the sizes of the interior hollows of the HSU-GNPs could be changed by adjusting the amount of silver nitrate added into hydrogen tetrachloroaurate trihydrate solution. The absorption spectra of the HSU-GNPs showed that the localized surface plasmon resonance (LSPR) peaks were red-shifted with increasing size of the interior hollows in the HSU-GNPs. When the added amount of silver nitrate was up to 6 mu l, the LSPR peak of the synthesized HSU-GNP reached 726 nm as a maximum red-shift. Furthermore, the absorption spectra of the HSU-GNPs with different morphologies were theoretically simulated by the finite element method, which was consistent with the experimental results and explained the origin of the red-shift of the LSPR peaks. In addition, the surface-enhanced Raman scattering (SERS) of the sea urchin gold nanoparticles were also investigated using 4-mercaptobenzoic acid as a Raman reporter molecule. Both the experimental and calculated results showed that the HSU-GNPs had stronger SERS enhancement than the solid sea-urchin gold nanoparticles. In particular, the HSU-GNPs prepared by adding 6 mu l silver nitrate exhibited a maximum SERS enhancement factor, EF = 1.1 x 10(9), due to the LSPR peak at 726 nm which is near to the excitation wavelength, 785 nm. This feature is significant for designing a biosensor with a super-high sensitivity based on the morphology of the HSU-GNPs.
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