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相对于单一金属纳米材料,二金属复合纳米材料具有更大的潜在应用价值.基于时域有限差分方法,研究了SiO2-Ag-Au和SiO2-Au-Ag二金属三层纳米管的消光光谱,并对其局域表面等离激元共振(Localized Surface Plasmon Resonance,LSPR)特性进行了分析.研究发现,内核尺寸变大将导致上述两种金属纳米管LSPR峰红移;内层金属及外层金属壳层厚度增大均会导致其LSPR峰蓝移.银壳厚度变化对纳米管LSPR的调制作用大于金壳厚度变化造成的影响.上述现象可以利用等离激元杂化理论及自由电子和振荡电子变化的竞争机制进行分析.The localized surface plasmon resonance (LSPR) properties of bimetallic gold and silver three-layered nanotubes such as SiO2-Ag-Au and SiO2-Au-Ag nanotubes have been investigated with the variations of Au or Ag shell thickness and size of the core by means of Finite Difference Time Domain (FDTD) method. With increase in the core size, it is found that the LSPR peaks show red-shift. We also observe with increasing the thickness of the Au or Ag shell that the LSPR peaks show blue-shift. Furthermore, the modulation of LSPR due to Ag shell is more significant compared with that due to Au shell. We have ascribed the variations of the LSPR peaks to the plasmon hybridization and the competition between the changes of conduction and oscillation electrons.
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Keywords:
- bimetallic nanotube /
- plasmon resonance /
- extinction spectra /
- Finite Difference Time Domain
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[5] Zhang H X, Gu Y, Gong Q H 2008 Chin. Phys. B 17 2567
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[7] Kelly K L, Coronado E, Zhao L L, Schatz G C 2003 J. Phys. Chem.B 107 668
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[9] Wei H, Hao F, Huang Y Z, WangWZ, Nordlander P, Xu H X 2008Nano Lett. 8 2497
[10] Brewer S H, Anthireya S J, Lappi S E, Drapcho D L, Franzen S2002 Langmuir 18 4460
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[18] Mock J J, Oldenburg S J, Smith D R, Schultz D A, Schultz S 2002Nano Lett. 2 465
[19] Hendren W R, Murphy A, Evans P, Connor D, Wurtz G A, ZayatsA V, Atkinson R, Pollard R J 2008 J. Phys. Condens. Matter 20362203
[20] Cong C, Wu D J, Liu X J 2011 Acta Phys. Sin. 60 046102 (in Chinese) [丛超, 吴大建, 刘晓峻 2011 60 046102]
[21] Wu D J, Liu X J, Li B 2011 J. Appl. Phys. 109, 083540
[22] Allain L R, Vo-Dinh T 2002 Anal. Chim. Acta 469 149
[23] Hirsch L R, Jackson J B, Lee A, Halas N J, West J L 2003 Anal.Chem. 75 2377
[24] Sershen S R, West J L 2000 J. Biomed. Mat. Res. 51 293
[25] O’Neal D P, Hirsch L R, Halas N J, Paynea J D, West J L 2004Cancer Lett. 209 171
[26] Lu L L, Wang H S, Zhou Y H, Xi S Q, Zhang H J, Hu J W, ZhaoB 2002 Chem. Commun. 2 144
[27] Bruzzone S, Arrighini G P, Guidotti C 2003 Mater. Sci. Eng. C23 965
[28] Zhu J 2005 Physica E 27 296
[29] Oldenburg S J, Hale G D, Radloff C, Halas N J 1999 Appl. Phys.Lett. 75 1063
[30] Grady N K, Halas N J, Nordlander P 2004 Chem. Phys. Lett. 399167.
[31] Prodan E, Radloof C, Halas N J, Nordlander P 2003 Science 302419
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[1] Krenn J R, Dereux A, Weeber J C, Bourillot E, Lacroute Y, Goudonnet J P 1999 Phys. Rev. Lett. 82 2590
[2] Maier S A, Brongersma M L, Kik P G, Meltzer S, Re-quicha A AG, Atwater H A 2001 Adv. Mater. 13 1501
[3] Quinten M, Leitner A, Krenn J R, Aussenegg F R 1998 Opt. Lett.23 1331
[4] Maier S A, Kik P G, Atwater H A, Meltzer S, Harel E, Koel B E, Requicha A A G 2003 Nat. Mater. 2 229
[5] Zhang H X, Gu Y, Gong Q H 2008 Chin. Phys. B 17 2567
[6] Kreibig U, Vollmer M 1995 Optical Properties of Metal Clusters(Berlin: Springer)
[7] Kelly K L, Coronado E, Zhao L L, Schatz G C 2003 J. Phys. Chem.B 107 668
[8] Mock J J, Hill R T, Degiron A, Zauscher S, Chilkoti A, Smith D R2008 Nano Lett. 8 2245
[9] Wei H, Hao F, Huang Y Z, WangWZ, Nordlander P, Xu H X 2008Nano Lett. 8 2497
[10] Brewer S H, Anthireya S J, Lappi S E, Drapcho D L, Franzen S2002 Langmuir 18 4460
[11] Prodan E, Nordlander P 2004 J. Chem. Phys. 120 5444
[12] Westcott S L, Jackson J B, Radloff C, Halas N J 2002 Phys. Rev.B 66 155431
[13] Wu D J, Liu X J 2008 Acta Phys. Sin. 57 5138 (in Chinese) [吴大建、刘晓峻 2008 textbf{ 57 5138]
[14] Wu D J, Liu X J 2010 Appl. Phys. Lett. 97 061904
[15] Zhu J, Bai S W, Zhao J W, Li J J 2009 Appl. Phys. A 97 431
[16] Leveque G, Martin O J F 2006 Opt. Express 14 9971
[17] Limmer S J, Chou T P, Cao G Z 2003 J. Phys. Chem. B 107 13313
[18] Mock J J, Oldenburg S J, Smith D R, Schultz D A, Schultz S 2002Nano Lett. 2 465
[19] Hendren W R, Murphy A, Evans P, Connor D, Wurtz G A, ZayatsA V, Atkinson R, Pollard R J 2008 J. Phys. Condens. Matter 20362203
[20] Cong C, Wu D J, Liu X J 2011 Acta Phys. Sin. 60 046102 (in Chinese) [丛超, 吴大建, 刘晓峻 2011 60 046102]
[21] Wu D J, Liu X J, Li B 2011 J. Appl. Phys. 109, 083540
[22] Allain L R, Vo-Dinh T 2002 Anal. Chim. Acta 469 149
[23] Hirsch L R, Jackson J B, Lee A, Halas N J, West J L 2003 Anal.Chem. 75 2377
[24] Sershen S R, West J L 2000 J. Biomed. Mat. Res. 51 293
[25] O’Neal D P, Hirsch L R, Halas N J, Paynea J D, West J L 2004Cancer Lett. 209 171
[26] Lu L L, Wang H S, Zhou Y H, Xi S Q, Zhang H J, Hu J W, ZhaoB 2002 Chem. Commun. 2 144
[27] Bruzzone S, Arrighini G P, Guidotti C 2003 Mater. Sci. Eng. C23 965
[28] Zhu J 2005 Physica E 27 296
[29] Oldenburg S J, Hale G D, Radloff C, Halas N J 1999 Appl. Phys.Lett. 75 1063
[30] Grady N K, Halas N J, Nordlander P 2004 Chem. Phys. Lett. 399167.
[31] Prodan E, Radloof C, Halas N J, Nordlander P 2003 Science 302419
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