Highly Fluorescent Noble-Metal Quantum Dots

Annual Review of Physical Chemistry - Tập 58 Số 1 - Trang 409-431 - 2007
Jie Zheng1, Philip R. Nicovich1, Robert M. Dickson1
1School of Chemistry and Biochemistry, and The Petit Institute of Bioengineering and Bioscience, Georgia Institute of Technology, Atlanta, Georgia 30332–0400;, ,

Tóm tắt

Highly fluorescent, water-soluble, few-atom noble-metal quantum dots have been created that behave as multielectron artificial atoms with discrete, size-tunable electronic transitions throughout the visible and near infrared. These molecular metals exhibit highly polarizable transitions and scale in size according to the simple relation EFermi/N1/3, predicted by the free-electron model of metallic behavior. This simple scaling indicates that fluorescence arises from intraband transitions of free electrons, and these conduction-electron transitions are the low-number limit of the plasmon—the collective dipole oscillations occurring when a continuous density of states is reached. Providing the missing link between atomic and nanoparticle behavior in noble metals, these emissive, water-soluble Au nanoclusters open new opportunities for biological labels, energy-transfer pairs, and light-emitting sources in nanoscale optoelectronics.

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Annual Review of Physical Chemistry

Tập 58 Số 1

409-431

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