Single-molecule surface-enhanced Raman spectroscopy from a molecularly-bridged silver nanoparticle dimer

被引：52

作者：

Vlckova, Blanka ^{[1
]}

Moskovits, Martin ^{[2
]}

Pavel, Ioana ^{[2
]}

Siskova, Karolina ^{[1
]}

Sladkova, Magdalena ^{[1
]}

Slouf, Miroslav ^{[3
]}

机构：

[1] Charles Univ Prague, Dept Phys & Macromol Chem, Prague 12840 2, Czech Republic

[2] Univ Calif Santa Barbara, Dept Chem & Biochem, Santa Barbara, CA 93106 USA

[3] Acad Sci Czech Republ, Inst Macromol Chem, CR-16206 Prague 6, Czech Republic

来源：

CHEMICAL PHYSICS LETTERS | 2008年 / 455卷 / 4-6期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1016/j.cplett.2008.02.078

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Silver nanoparticle dimers were produced and immobilized on a functionalized TEM finder grid, by sequential assembly using bifunctional molecular linker 4,4'-diaminoazobenzene. SERS spectra recorded were ascribed to the specific dimer by TEM-imaging. Temporal fluctuations (blinking) of SERS signal demonstrate observation of single-molecule Raman. By linker-mediated assembly at small linker to nanoparticle ratios, electromagnetic hot spots are created with one or very few molecular linkers localized in them. Observed recurrence times are consistent with known surface diffusion constants, suggesting that single molecule dynamics causing the blinking might arise from breaking of linker bond to one of the nanoparticles, linker diffusion over the other nanoparticle and return to the hot spot. (C) 2008 Elsevier B.V. All rights reserved.

引用

页码：131 / 134

页数：4

共 23 条

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