Preparation of nanosized gold particles in a biopolymer using UV photoactivation

Carboxymethylagarose-AuNPs generated through green route for selective detection of Hg2+ in aqueous medium with a blue shift

“…1 shows the UV spectra of the CMA and CMA-AuNPs. The LSPR absorption maximum observed at 523 nm confirmed the formation of CMA-AuNPs (Radhakumary & Sreenivasan, 2011).The size of CMA-AuNPs obtained in the present study ranges from 5 to 7 nm and exhibited an absorption maximum at 523 nm and was in good agreement with those reported in literature (Huang & Yang, 2004b;Pal, Esumi, & Pal, 2005;Watthanaphanit, Panomsuwan, & Saito, 2014). To investigate the interaction of different metal ions with CMA-AuNPs, 100 ppm aqueous solutions of metal ions (e.g.…”

Controlled spontaneous generation of gold nanoparticles assisted by dual reducing and capping agents

“…Following the Turkevich method few other sodium carboxylates have been investigated. Sodium alginate, which is a linear polysaccharide composed of β-D-mannuronic acid and α-L-guluronic acid, was recently studied [130]. In this particular case, Au-NPs with sizes ranging from 2 to 30 nm were obtained under UV photoactivation of this biopolymer used as stabilizing and reducing agent.…”

“…If particles of small size were obtained, a limited number of bigger particles per nanogel were also observed (ten particles/nanogel). Biopolymers such as sodium alginate [130] or gum Arabic [168], which is a natural and harmless polysaccharide derived from acacia trees, proved to be cost-effective and reproducible alternatives to the chemical synthesis by producing Au-NPs of high stability over the time. Gellan gum, which is a linear anionic heteropolysaccharide widely used in food as gelling agent, also produced highly stable Au-NPs [169].…”

Preparation of Au and Au–Pt nanoparticles within PMMA matrix using UV and X-ray irradiation

“…In this regard, Faupel et al prepared Ni, Cu, Ag, and Au nanoparticles on polymers (polyimide, polystyrene, Teflon, PMDA-ODA) with different compositions [16][17][18][19]. Synthesis of metallic nanoparticles within polymeric media using photochemical means is an attractive route due to the relative simplicity of the technique and the possibility to combine with widely used lithographic methods [20][21][22][23][24][25]. However, in all of these synthesis methods elevated temperature(s) and/or certain photo-sensitizers were needed.…”