Chitosan-Mediated Synthesis of Gold Nanoparticles on Patterned Poly(dimethylsiloxane) Surfaces

Abstract

Synthesis of gold nanoparticles on surfaces has been accomplished by the incubation of poly(dimethylsiloxane) (PDMS) films in tetrachloroauric(III) acid and chitosan solution at room temperature and 4 degrees C. One important point in the present study is that the synthesis selectively occurred on the PDMS surface. These observations are substantially different from the reaction in solution, in which no particles can be formed at room temperature. Computation of surface plasmon bands (SPBs) based on Mie theory suggests that the particles are partially coated by chitosan molecules, and the experimental results confirm the theoretical calculations. The proposed mechanism is that chitosan molecules adsorbed or printed on the PDMS surfaces act as reducing/stabilizing agents. Furthermore, PDMS films patterned with chitosan could induce localized synthesis of gold nanoparticles in regions capped with chitosan only. In this way, colloidal patterns were fabricated on the surfaces with high spatial selectivity simultaneously with the synthesis of the particles. Surface-induced fluorescence quenching was observed in the regions capped with gold nanoparticles as well.

Preparation of Nafion-Ru(bpy)32+-Chitosan/Gold Nanoparticles Composite Film and Its Electrochemiluminescence Application

“…33 Furthermore, the previous research works demonstrated that the CHIT had stronger adsorbing ability for AuCl4 -and could form more GNPs inside the CHIT film. 34 Based on these considerations, we investigated the possibility of preparing the Nafion-CHIT/GNPs composite film by the TEM and photography technique. As shown in Figs.…”

Toxicity and antibacterial assessment of chitosan-coated silver nanoparticles on human pathogens and macrophage cells

“…Chitosan, a positively charged polysaccharide biopolymer derived from chitin, exhibits a number of interesting biological properties such as antimicrobial activity, chelating and polycationic properties, biodegradability, biocompatibility, the ability to induce disease resistance in plants, and display of stimulating or inhibiting activities toward human cells. 24,25 For these reasons, chitosan has received great attention in the fields of medicine, food, chemicals, pharmaceuticals, and agriculture. [26][27][28][29] Although several independent studies have shown applications of nanoparticles in various fields, studies describing their impact on counteracting bacterial infections are limited.…”

In situ Synthesis of Metal Nanoparticle Embedded Free Standing Multifunctional PDMS Films

“…Gao and coworkers have reported chitosan assisted gold nanoparticle deposition on PDMS surfaces. [13] Chen and co-workers synthesized gold nanoparticle-PDMS composite films by immersing cured PDMS films in gold chloride solution. These films were used for enzyme immobilization and as a chemical reactor.…”