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Al2O3介质薄膜与纳米Ag颗粒构成的复合结构，被应用于表面增强Raman散射探测实验中，其中Al2O3介质薄膜对纳米Ag颗粒的吸收谱及增强Raman散射光谱的影响被特别关注.该复合结构的光学特性表征出纳米Ag颗粒的偶极振荡特性.从光吸收谱中可以看到，其共振吸收谱随Al2O3介质薄膜厚度增加而在整个谱域上发生红移，表明纳米Ag颗粒的周围介电常数随Al2O3介质薄膜厚度的增加而增大.采用罗丹明6G作为探针原子，6个Raman特征峰的平均增益值作为表征表面增强Raman散射衬底增益程度的量度.实验结果表明,Al2O3介质薄膜层的引入提高了纳米Ag颗粒的衬底介电常数，并引起了散射共振的增强，从而使表面增强Raman散射强度提高.
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关键词:
- 纳米Ag薄膜 /
- 共振吸收 /
- 表面增强Raman散射 /
- 介电常数
Combined Ag nanoparticles with Al2O3 dielectric layer structure have been designed for molecular detection using surface enhanced Raman scattering. Optical absorption spectra studies reveal dipole plasmon resonance absorption property, which show regular red shift with the increasing of the thickness of Al2O3 layer. By use the combined structure as SERS substrates and rhodamine 6G as a test molecule, the results in this paper show that the scattering at 1064 nm increases with the thickness of Al2O3 dielectric layer which leads to the surrounding dielectric constant of Ag nanoparticles to increase.-
Keywords:
- silver nanoparticles /
- resonance absorption /
- surface enhanced Raman scattering /
- dielectric constant
[1] ［1］Mishra Y K, Mohapatra S, Singhal R, Avasthi D K, Agarwal D C, Ogale S B 2008 Appl. Phys. Lett. 92 043107
[2] ［2］Huang Q, Zhang X D, Wang S, Cao L R, Sun J, Geng W D, Xiong S Z, Zhao Y 2009 Acta Phys. Sin. 58 2731 (in Chinese) ［黄茜、张晓丹、王烁、曹丽冉、孙建、耿卫东、熊绍珍、赵颖 2009 58 2731］
[3] ［3］Xu G, Huang C M, Tazawa M, Jin P, Chen L H 2009 Opt. Comm. 282 896
[4] ［4］Wang T J, Lin W S 2006 Appl. Phys. Lett. 89 173903
[5] ［5］Haes A J, Zou S, Schatz G C, van Duyne R P 2004 J. Phys. Chem. B 108 109
[6] ［6］Nie S, Emory S R 1997 Science 275 1102
[7] ［7］Zhang Y, Gu C, Schwartzberg A M, Zhang J Z 2005 Appl. Phys. Lett. 87 123105
[8] ［8］Feldstein M J, Keating C D, Liau Y H, Natan M J, Scherer N F 1997 J. Am. Chem. Soc. 119 6638
[9] ［9］Sajan D, Joe I H, Jayakumar V S 2006 J. Raman Spectrosc. 37 508
[10] ］Wu Q S, Zhao Y, Zhang C B, Li F 2005 Acta Phys. Sin. 54 1452 (in Chinese) ［吴青松、赵岩、张彩碚、李峰 2005 54 1452
[11] ］Prokes S M, Alexson D A, Glembocki O J, Park H D, Rendell R W 2009 Appl. Phys. Lett. 94 093105
[12] ］Imura K, Okamoto H, Hossain M K, Kitajima M 2006 Nano Lett. 6 2173
[13] ］Fang J X, Yi Y, Ding B J, Song X P 2008 Appl. Phys. Lett. 92 131115
[14] ］Weimer W A, Dyer M J 2001 Appl. Phys. Lett. 79 3164
[15] ］Meier M, Wokaun A, Vo-Dinh T 1985 J. Phys. Chem. 89 1843
[16] ］Huang Q, Wang J, Cao L R, Sun J, Zhang X D, Geng W D, Xiong S Z, Zhao Y 2009 Acta Phys. Sin. 58 1980 (in Chinese) ［黄茜、王京、曹丽冉、孙建、张晓丹、耿卫东、熊绍珍、赵颖 2009 58 1980］
[17] ］Stair P C 2001 Curr. Opin. Solid St. M. 5 365
[18] ］Mie G 1908 Ann. Phys. 25 377
[19] ］Kelly K L, Coronado E, Zhao L L, Schatz G C 2003 J. Phys. Chem. B 107 668
[20] ］Link S, El-Sayed M A 1999 J. Phys. Chem. B 103 4212
[21] ］Xu G, Chen Y, Tazawa M, Jin P 2006 Appl. Phys. Lett. 88 043114
[22] ］Orendorff C J, Gole A, Sau T K, Murphy C J 2005 Anal. Chem. 77 3261
[23] ］Xu H 2004 Appl. Phys. Lett. 85 5980
[24] ］Prokes S M, Glembocki O J, Rendell R W, Ancona M G 2007 Appl. Phys. Lett. 90 093105
-
[1] ［1］Mishra Y K, Mohapatra S, Singhal R, Avasthi D K, Agarwal D C, Ogale S B 2008 Appl. Phys. Lett. 92 043107
[2] ［2］Huang Q, Zhang X D, Wang S, Cao L R, Sun J, Geng W D, Xiong S Z, Zhao Y 2009 Acta Phys. Sin. 58 2731 (in Chinese) ［黄茜、张晓丹、王烁、曹丽冉、孙建、耿卫东、熊绍珍、赵颖 2009 58 2731］
[3] ［3］Xu G, Huang C M, Tazawa M, Jin P, Chen L H 2009 Opt. Comm. 282 896
[4] ［4］Wang T J, Lin W S 2006 Appl. Phys. Lett. 89 173903
[5] ［5］Haes A J, Zou S, Schatz G C, van Duyne R P 2004 J. Phys. Chem. B 108 109
[6] ［6］Nie S, Emory S R 1997 Science 275 1102
[7] ［7］Zhang Y, Gu C, Schwartzberg A M, Zhang J Z 2005 Appl. Phys. Lett. 87 123105
[8] ［8］Feldstein M J, Keating C D, Liau Y H, Natan M J, Scherer N F 1997 J. Am. Chem. Soc. 119 6638
[9] ［9］Sajan D, Joe I H, Jayakumar V S 2006 J. Raman Spectrosc. 37 508
[10] ］Wu Q S, Zhao Y, Zhang C B, Li F 2005 Acta Phys. Sin. 54 1452 (in Chinese) ［吴青松、赵岩、张彩碚、李峰 2005 54 1452
[11] ］Prokes S M, Alexson D A, Glembocki O J, Park H D, Rendell R W 2009 Appl. Phys. Lett. 94 093105
[12] ］Imura K, Okamoto H, Hossain M K, Kitajima M 2006 Nano Lett. 6 2173
[13] ］Fang J X, Yi Y, Ding B J, Song X P 2008 Appl. Phys. Lett. 92 131115
[14] ］Weimer W A, Dyer M J 2001 Appl. Phys. Lett. 79 3164
[15] ］Meier M, Wokaun A, Vo-Dinh T 1985 J. Phys. Chem. 89 1843
[16] ］Huang Q, Wang J, Cao L R, Sun J, Zhang X D, Geng W D, Xiong S Z, Zhao Y 2009 Acta Phys. Sin. 58 1980 (in Chinese) ［黄茜、王京、曹丽冉、孙建、张晓丹、耿卫东、熊绍珍、赵颖 2009 58 1980］
[17] ］Stair P C 2001 Curr. Opin. Solid St. M. 5 365
[18] ］Mie G 1908 Ann. Phys. 25 377
[19] ］Kelly K L, Coronado E, Zhao L L, Schatz G C 2003 J. Phys. Chem. B 107 668
[20] ］Link S, El-Sayed M A 1999 J. Phys. Chem. B 103 4212
[21] ］Xu G, Chen Y, Tazawa M, Jin P 2006 Appl. Phys. Lett. 88 043114
[22] ］Orendorff C J, Gole A, Sau T K, Murphy C J 2005 Anal. Chem. 77 3261
[23] ］Xu H 2004 Appl. Phys. Lett. 85 5980
[24] ］Prokes S M, Glembocki O J, Rendell R W, Ancona M G 2007 Appl. Phys. Lett. 90 093105
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