One-step synthesis of Au–Ag alloy nanoparticles using soluble starch and their photocatalytic performance for 4-nitrophenol degradation

Sun, Li; Lv, Peng‐Cheng; Li, Haonan; Wang, Fa; Su, Wenxian; Zhang, Lixin

doi:10.1007/s10853-018-2763-9

Cited by 27 publications

(7 citation statements)

References 45 publications

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“…In the XPS spectra of AgAu/SiO 2 galvanic sample (Figure 3C), the peaks related to the Ag 3d 5/2 and 3d 3/2 spin orbit coupling doublet, shifts in −0.4 eV while for AgAu/SiO 2 one-pot sample (Figure 3E) this shift is around −0.3 eV. The shifted BE to lower values is consistent with the formation of a Ag alloyed structure which is, in the present case, with Au (Tyson et al, 1992;Sun et al, 2018). For the BE values of Au 4f 7/2 and 4f 5/2 doublet in the samples of alloyed NPs (Figures 3D,F), the shifts compared to Au in the Au/SiO2 sample are meaningless considering the precision of ±0.1 eV in determining the BE.…”

Section: Materials Synthesis and Characterizationsupporting

confidence: 78%

Mechanochemical Strategies for the Preparation of SiO2-Supported AgAu Nanoalloy Catalysts

2022

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Silver-gold nanoalloys were prepared from their metal salts precursors through bottom-up mechanochemical synthesis, using one-pot or galvanic replacement reaction strategies. The nanostructures were prepared over amorphous SiO2 as an inert supporting material, facilitating their stabilization without the use of any stabilizing agent. The nanomaterials were extensively characterized, confirming the formation of the bimetallic nanostructures. The nanoalloys were tested as catalysts in the hydrogenation of 2-nitroaniline and exhibited up to 4-fold the rate constant and up to 37% increased conversion compared to the respective single metal nanoparticles. Our approach is advantageous to produce nanoparticles with clean surfaces with available catalytic sites, directly in the solid-state and in an environmentally friendly manner.

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Section: Materials Synthesis and Characterizationsupporting

confidence: 78%

Mechanochemical Strategies for the Preparation of SiO2-Supported AgAu Nanoalloy Catalysts

2022

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“…In addition, it is necessary to understand the mechanisms of these synthetic routes to increase their efficiency. Several routes have been developed with the aim of using natural materials such as starch to coat, protect and stabilize AgNPs [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Original photochemical synthesis of Ag nanoparticles mediated by potato starch

et al. 2019

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In this contribution, we report an original photochemical method and its mechanism, in which Ag nanoparticles (AgNPs) are formed in the presence of starch. AgNO 3 /potato starch aqueous suspensions are irradiated (254 nm, 8 W) at room temperature and the Ag + /starch ratio can be varied to tune the size of AgNPs. The evolution of the AgNPs plasmon resonance band during the reaction is monitored by UV-Vis spectroscopy and evidences that AgNPs are formed in a two-stage process combining nucleation and growth, with the nucleation being controlled by the amount of added starch. Moreover, infrared and Raman spectra indicates that starch undergoes oxidation simultaneously to Ag + reduction, even though starch alone is not capable of reducing Ag + at an appreciable rate and UV irradiation is essential to produce sizeable amounts of AgNPs. Transmission electron microscopy reveals that AgNPs are nearly spherical with diameters ranging between 13 and 8 nm. The AgNPs/starch suspensions exhibit hydrodynamic diameters between 150 and 200 nm and zeta potentials very close to zero. Since AgNPs/starch suspensions are very stable over time, the colloidal stability is ensured by the steric hindrance imposed by starch rather than electrostatic repulsion.

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“…46,47 The gap value (about 6.0 eV) between the Ag 3d 5/2 and Ag 3d 7/2 states and that (about 3.7 eV) between the Au 4f 5/2 and Au 4f 7/2 states showed an acceptable fit with the values of zero-valent Ag and Au. 48,49 Hence, Ag and Au atoms in the surface of Au@AuAg NPs exist in the zero-valent state. In the high-resolution XPS analysis (Fig.…”

Section: Resultsmentioning

confidence: 99%

High-efficiency peroxidase mimics for fluorescence detection of H₂O₂ and l-cysteine

Zou

Yu-jie

et al. 2022

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One-step synthesis of Au–Ag alloy nanoparticles using soluble starch and their photocatalytic performance for 4-nitrophenol degradation

Cited by 27 publications

References 45 publications

Mechanochemical Strategies for the Preparation of SiO2-Supported AgAu Nanoalloy Catalysts

Mechanochemical Strategies for the Preparation of SiO2-Supported AgAu Nanoalloy Catalysts

Original photochemical synthesis of Ag nanoparticles mediated by potato starch

High-efficiency peroxidase mimics for fluorescence detection of H₂O₂ and l-cysteine

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One-step synthesis of Au–Ag alloy nanoparticles using soluble starch and their photocatalytic performance for 4-nitrophenol degradation

Cited by 27 publications

References 45 publications

Mechanochemical Strategies for the Preparation of SiO2-Supported AgAu Nanoalloy Catalysts

Mechanochemical Strategies for the Preparation of SiO2-Supported AgAu Nanoalloy Catalysts

Original photochemical synthesis of Ag nanoparticles mediated by potato starch

High-efficiency peroxidase mimics for fluorescence detection of H2O2 and l-cysteine

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High-efficiency peroxidase mimics for fluorescence detection of H₂O₂ and l-cysteine