Preparation and characterization of different shapes of Au–Ag bimetallic nanocomposites for enhanced physicochemical properties

Green controllable synthesis of Au–Ag alloy nanoparticles using Chinese wolfberry fruit extract and their tunable photocatalytic activity

“…Generally, the SPR wavelength of Au-Ag alloy NPs, attributed to the interaction between free electrons on their surface and light, can be controlled by three key factors: the kind of the reductant, the Au 3+ /Ag + molar ratio in raw materials, and the synthesis time. [33][34][35] Up to now, based on green synthesis methods, it is difficult to exibly change the SPR wavelength of Au-Ag alloy NPs in one-pot when the Au 3+ /Ag + molar ratio in raw materials is xed. [17][18][19][20] To obtain eco-friendly Au-Ag alloy NPs, the wolerry fruit extract was used as reductant and surfactant.…”

Fabrication of monodispersed Au@Ag bimetallic nanorod-loaded nanofibrous membrane with fast thermo-responsiveness and its use as a smart free-standing SERS substrate

“…Application of Au@AgNRs/PNN composite nanobrous membrane for in situ SERS monitoring of its catalyzed reaction As reported recently, 31 Au@AgNRs possess high catalytic activity and selectivity for some reactions, so it is expected that a exible free-standing Au@AgNRs/PNN composite nanobrous membrane with macroscopic strength can be used for label-free in situ SERS monitoring of its catalyzed reaction. To validate this expectation, the reduction of 4-NTP to 4-aminothiophenol (4-ATP) by NaBH 4 in the presence of the membrane was selected as a model reaction, as schematically illustrated in Fig.…”

“…29,30 For example, the results obtained by Monga et al demonstrated that Au@AgNRs catalyze the selective formation of 3-nitroaniline in the reduction of 1,3-dinitrobenzene, compared to 1,3-phenylenediamine in the case of Au and Ag nanorods. 31 Herein, we report the fabrication of a monodispersed Au@AgNR-loaded thermo-responsive composite nanobrous membrane by electrospinning an aqueous solution containing poly(N-isopropylacrylamide-co-N-hydroxymethylacrylamide) and the nanorods, followed by heat treatment. Observations made using electron microscopy conrm that the Au@AgNRs are oriented along the axes of its constituent nanobers.…”

Anisotropic Overgrowth of Palladium on Gold Nanorods in the Presence of Salicylic Acid Family Additives

“…Heterometallic nanostructures exhibit new characteristics compared to their monometallic counterparts, making them useful in the fields of electronics, catalysis, and biomedical applications. − Especially of interest are gold nanoparticle (AuNP)-based hybrid heterometallic nanostructures. They show localized surface plasmon resonance (SPR) bands in the visible to the near-IR range, which makes them strong absorbers for light.…”