Nano Archive

Fluorescent superlattices of gold nanoparticles: A new class of functional materials

Shibu, Edakkattuparambil Sidharth and Habeeb Muhammed, Madathumpady Abubaker and Kimura, Keisaku and Pradeep, Thalappil (2008) Fluorescent superlattices of gold nanoparticles: A new class of functional materials. Nano Research, 2 (3). pp. 220-234.


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Fluorescent three-dimensional (3-D) superlattices of dansyl glutathione protected gold nanoparticles, with potential applications in molecular detection, have been synthesized at an air/water interface by controlling the pH of the nanoparticle suspension. The number of fluorophores per nanoparticle was calculated to be ∼127. Morphologies of the superlattice crystals were examined using scanning electron microscopy (SEM). Most of the crystals observed were triangular in shape. High-resolution transmission electron microscopy (HRTEM) and small angle X-ray scattering (SAXS) were used to study the packing of nanoparticles in these crystals. Both these studies showed that the nanoparticles were arranged in a face-centered cubic (fcc) pattern with a particle-particle distance (center-center) of ∼10.5 nm. Evolution of the crystal morphologies with time was also examined. The fluorescence properties of these triangles were studied using confocal fluorescence imaging and confocal Raman mapping, which were in good agreement with the morphologies observed by SEM. The superlattice exhibits near-infrared (NIR) absorption in the range 1100–2500 nm. Easy synthesis of such functional nanoparticle-based solids makes it possible to use them in novel applications. We utilized the fluorescence of dansyl glutathione gold superlattice crystals for the selective detection of bovine serum albumin (BSA), the major protein constituent of blood plasma, based on the selective binding of the naphthalene ring of the dansyl moiety with site I of BSA.

Item Type:Article
Uncontrolled Keywords:Periodic self-assembly, dansyl glutathione, fl uorescent superlattice, confocal fl uorescence imaging, selective binding
Subjects:Material Science > Functional and hybrid materials
ID Code:4257
Deposited By:Prof. Alexey Ivanov
Deposited On:16 Mar 2009 09:42
Last Modified:12 Aug 2009 12:26

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