| Original Articles |
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Effect of Aspect Ratio Distribution on Localized Surface Plasmon Resonance Extinction Spectrum of Gold Nanorods |
| TAO Jun1, LU Yong-Hua1, ZHENG Rong-Sheng1, LIN Kai-Qun1, XIE Zhi-Guo1, LUO Zhao-Feng2, LI Sheng-Li1, WANG Pei1, MING Hai1 |
| Department of Physics, Anhui Key Laboratory of Optoelectronic Science and Technology, University of Science and Technology of China, Hefei 230026 |
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| Cite this article: |
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TAO Jun, LU Yong-Hua, ZHENG Rong-Sheng et al 2008 Chin. Phys. Lett. 25 4459-4462 |
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Abstract Gold nanorods with different aspect ratios are prepared in micells using a seeded growth method. Their extinction spectra are observed with an UV-visible spectrophotometer and analysed theoretically. It is known that there are two plasmon resonance peaks for gold nanorod corresponding to transverse and longitudinal plasmon resonance respectively. Moreover, the longitudinal plasmon resonance peak shifts to long wavelength when we increase the aspect ratio determined from TEM. Especially, we model the extinction spectrum using Gans' theory and compare it with our experimental result. Considering the aspect radios distribution of gold nanorods, it is found that longitudinal plasmon resonance peak will be wider than the nanorods with single aspect ratio, which is consistent with our experimental result. In addition, the effect of dielectric constant of surrounding medium is considered.
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| Keywords:
81.05.-t
81.07.-b
81.16.Be
78.20.Ci
78.67.Bf
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Received: 12 September 2008
Published: 27 November 2008
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| PACS: |
81.05.-t
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(Specific materials: fabrication, treatment, testing, and analysis)
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81.07.-b
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(Nanoscale materials and structures: fabrication and characterization)
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81.16.Be
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(Chemical synthesis methods)
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78.20.Ci
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(Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity))
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78.67.Bf
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(Nanocrystals, nanoparticles, and nanoclusters)
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[1] Huang Y, Duan X and Lieber C M 2001 Science. 291 630
[2] Law M, Sibuly D J, Johnson J C, Goldberger J, Saykally R Jand Yang P 2004 Science. 305 1269
[3] Katz E and Willner I 2004 Angew. Chem. Int. Ed.Engl. 43 6042
[4] Link S, Mohamed M, and El-Sayed M 1999 J. Phys.Chem. B 103 3073
[5] Jana N R, Gearheart L and Murphy C J 2001 J. Phys.Chem. B 105 4065
[6] Martin C R 1996 Chem. Mater. 8 1739
[7] Yu Y Y, Chang S S, Lee C L and Wang C R C 1997 J.Phys. Chem. B 101 6661
[8] Nikoobakht B and El-Sayed M A 2003 Chem. Mater. 15 1957
[9] Kim F, Song J H and Yang P 2002 J. Am. Chem. Soc. 124 14316
[10] Johnson P B and Christy R. W 1972 Phys. Rev. B 6 4370 |
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