Nano Archive

Metal-enhanced fluorescence of colloidal nanocrystals with nanoscale control

Pompa, P. P. and Martiradonna, L and Della Torre, A and Della Sala, F and Manna, L and De Vittorio, M and Calabi, F and Cingolani, R and Rinaldi, R (2006) Metal-enhanced fluorescence of colloidal nanocrystals with nanoscale control. NATURE NANOTECHNOLOGY, 1 (2). pp. 126-130.

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Engineering the spectral properties of fluorophores, such as the enhancement of luminescence intensity, can be achieved through coupling with surface plasmons in metallic nanostructures(1-11). This process, referred to as metal-enhanced fluorescence, offers promise for a range of applications, including LEDs, sensor technology, microarrays and single-molecule studies. It becomes even more appealing when applied to colloidal semiconductor nanocrystals, which exhibit size-dependent optical properties, have high photochemical stability, and are characterized by broad excitation spectra and narrow emission bands(12). Other approaches have relied upon the coupling of fluorophores ( typically organic dyes) to random distributions of metallic nanoparticles or nanoscale roughness in metallic films(1-4,6,8). Here, we develop a new strategy based on the highly reproducible fabrication of ordered arrays of gold nanostructures coupled to CdSe/ZnS nanocrystals dispersed in a polymer blend. We demonstrate the possibility of obtaining precise control and a high spatial selectivity of the fluorescence enhancement process.

Item Type:Article
Subjects:Material Science > Nanochemistry
ID Code:2214
Deposited By:Anuj Seth
Deposited On:06 Jan 2009 16:45
Last Modified:08 May 2009 10:28

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