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Thin chitosan films as a platform for SPR sensing of ferric ions
Holly A McIlwee1, Caroline L Schauer, Vera G Praig
1Department of Materials Science and Engineering; Drexel University, 3141 Chestnut St.. Philadelphia, PA 19104, USA.
Abstract:
Homogeneous chitosan films of various thicknesses (10-65 nm) were deposited on thin gold films through spin coating. The resulting interfaces were characterized using surface plasmon resonance (SPR), AFM, profilometry and cyclic voltammetry. The strong chelating properties of chitosan films to Fe(3+) were investigated using cyclic voltammetry. Through SPR measurements, an affinity constant between chitosan and Fe(3+) of 9.49 x 10(5) M(-1) was determined with a detection limit as low as 250 ppb.
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