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Localized Surface Plasmon Resonance of Gold Nanoparticle-Modified Chitosan Films for Heavy-Metal Ions Sensing

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Gold nanoparticles (Au NPs) were entrapped within, and in between, a cross-linked thin chitosan film, casted onto a glass substrate. The glass/chitosan/Au NPs interface was formed by casting Au NPs-chitosan solutions onto flat glass supports, followed by exposure to Au NPs in solution and repeating the casting procedure for the desired number of layers. The optical properties of the resulting interfaces and their ability to sense various heavy metal ions, such as Fe3+ and Cu2+, were investigated utilizing the phenomenon of localized surface plasmon resonance (LSPR) visualized by UV/V is absorption spectroscopy. The interfaces investigated showed different optical behavior to the presence of the different metal ions. An increase of the LSRP absorption maximum at max = 517 nm was observed upon Fe3+ binding with a detection limit of 0.5 M and a linear range up to ∼2 M. Due to a lower binding capability of Cu2+, the detection limit is 0.5 mM with a linear range up to ∼5 mM.
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Keywords: CHITOSAN FILM; GOLD NANOPARTICLES (AU NPS); HEAVY METAL IONS DETECTION; LOCALIZED SURFACE PLASMON RESONANCE SPECTROSCOPY (LSPR)

Document Type: Research Article

Publication date: 01 January 2009

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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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