Bioconjugates of CdTe nanowires and Au nanoparticles: Plasmon-exciton interactions, luminescence enhancement, and collective effects

被引：350

作者：

Lee, J

Govorov, AO

Dulka, J

Kotov, NA ^{[1
]}

机构：

[1] Univ Michigan, Dept Chem Engn, Ann Arbor, MI 48109 USA

[2] Univ Michigan, Dept Mat Sci & Engn, Ann Arbor, MI 48109 USA

[3] Univ Michigan, Dept Biomed Engn, Ann Arbor, MI 48109 USA

[4] Ohio Univ, Dept Phys & Astron, Athens, OH 45701 USA

来源：

NANO LETTERS | 2004年 / 4卷 / 12期

关键词：

D O I：

10.1021/nl048669h

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Nanoscale superstructures made from CdTe nanowires (NWs) and metal nanoparticles (NPs) are prepared via bioconjugation reactions. Prototypical biomolecules, such as D-biotin and streptavidin pair, were utilized to connect NPs and NWs in solution. It was found that Au NPs form a dense shell around a CdTe NW. The superstructure demonstrated unusual optical effects related to the long-distance interaction of the semiconductor and noble metal nanocolloids. The NW-NP complex showed 5-fold enhancement of luminescence intensity and a blue shift of the emission peak as compared to unconjugated NW. The system was theoretically examined in a simple model of CdTe NW coaxially surrounded by an Au shell, which gives excellent agreement with experimental data. The combination of time-resolved luminescence and calculations demonstrated that increase of fluorescence intensity occurs due to stimulation of photon emission by an electromagnetic field generated around the Au NP. The process is reminiscent of SERS, although displaying smaller enhancement factors. Importantly, the luminescence enhancement should be treated as a collective response of Au-NPs, rather than a result of isolated NP-NW interactions.

引用

页码：2323 / 2330

页数：8

共 79 条

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