| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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The Morphological Change of Silver Nanoparticles in Water |
| WANG Peng, WANG Rong-Yao**, JIN Jing-Yang, XU Le, SHI Qing-Fan** |
School of Physics, and Key Laboratory of Cluster Science of Ministry of Education, Beijing Institute of Technology, Beijing 100081
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| Cite this article: |
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WANG Peng, WANG Rong-Yao, JIN Jing-Yang et al 2012 Chin. Phys. Lett. 29 017805 |
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Abstract The solvent-induced morphological change of silver nanoparticles is studied with a combination of optical spectroscopy and atomic force microscopy (AFM). By using the local surface plasmon resonance (LSPR) spectroscopy arising from Ag nanoparticles, an in-situ investigation of the spectral changes is carried out before, during and after exposure of Ag island films to water. Combining with the morphological observations by AFM, we sort out the morphological and dielectric contributions to the water-induced LSPR changes. Our results demonstrate that a slight morphological change induced by water contact can result in an apparent blue shift of the LSPR spectral maximum. Furthermore, it is found that this structural change leads to a higher sensitivity of the Ag island films in response to the change in the external dielectric environment. This solvent-induced morphological change, and consequently the modification of the LSPR of the metal nanoparticles, may have significant impact in the applications of solvent-involved plasmon sensors, such as chemical/biological sensing and single-molecule spectroscopy.
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| Keywords:
78.67.Bf
73.20.Mf
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Received: 30 June 2011
Published: 07 February 2012
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| PACS: |
78.67.Bf
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(Nanocrystals, nanoparticles, and nanoclusters)
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73.20.Mf
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(Collective excitations (including excitons, polarons, plasmons and other charge-density excitations))
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