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Induced Circular Dichroism of Gold in the Self-Assembled Polymeric Nanoparticles

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This study reports that the alkanethiol-capped golds loaded in the self-assembled polymeric nanoparticles exhibit the characteristic induced circular dichroism (ICD) in the near UV absorption region. The core–shell type polymeric nanoparticles composed of poly(-benzyl L-glutamate) (PBLG) as hydrophobic inner core and poly(ethylene oxide) (PEO) as hydrophilic outer shell were obtained by the diafiltration method after dissolving PBLG/PEO block copolymer in organic solvent. The circular dichroism (CD) of alkanethiol-capped gold nanoparticles as the guest was induced by the chiral PBLG as the host in self-assembled polymeric nanoparticles with Cotton effect in the range of 220–230 nm whose crossing point matched max in the UV region of alkanethiol-capped gold nanoparticles. Transmission electron microscopy and electrophoretic light scattering spectrophotometry were used to study the morphology and particle size of gold-loaded core–shell type polymeric nanoparticles, respectively. The results indicated that the PBLG chains in the block copolymer and alkanethiol-capped gold nanoparticles were associated together by hydrophobic interaction and chiral PBLG core in the self-assembled polymeric nanoparticles induced CD of the gold.
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Keywords: GOLD NANOPARTICLES; INDUCED CIRCULAR DICHROISM; SELF-ASSEMBLED POLYMERIC NANOPARTICLES

Document Type: Research Article

Publication date: 2010-05-01

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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