Origin of symmetry breaking in the seed-mediated growth of bi-metal nano-heterostructures

Du, Guifen; Pei, Jun; Jiang, Zhiyuan; Chen, Qiaoli; Cao, Zhenming; Kuang, Qin; Xie, Zhaoxiong; Zheng, Lan‐Sun

doi:10.1016/j.scib.2018.05.035

Cited by 12 publications

(4 citation statements)

References 66 publications

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“…Recently, because of the synergetic functions between different kinds of noble metals, varying bimetal nanoparticles have been prepared for SERS. − To prepare bimetal nanostructures with various shapes and sizes, seed-mediated method, deposition–precipitation, galvanic replacement, coprecipitation, and templated growth have all been implemented previously. For instance, by simultaneous reduction of HAuCl 4 and H 2 PdCl 4 with ascorbic acid, gold–palladium alloy in a neuron-like shape was prepared under the stabilizing and structure-directing influence of N -methylimidazole .…”

Section: Introductionmentioning

confidence: 99%

Green and Controllable Synthesis of Au–Ag Bimetal Nanoparticles by Xylan for Surface-Enhanced Raman Scattering

Cai

Liu

et al. 2019

ACS Sustainable Chem. Eng.

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In surface-enhanced Raman scattering, Ag nanoparticles are broadly employed. However, their lack of oxidation resistance means that their performance diminishes and is difficult to repeat. In this study, with addition of xylan, Au–Ag core–shell and alloy nanoparticles were prepared. Besides functioning as a reducing and stabilizing agent for Au–Ag bimetal nanoparticles, xylan protected them from oxidation and aggregation and created hot spots between interconnected nanoparticles. By seed-mediated methods, Au–Ag hollow alloy and Au@Ag core–shell nanoparticles with different shell thicknesses were prepared. More spherical and larger core–shell nanoparticles were prepared by an optimized dosage of xylan without the generation of excess Ag nanoparticles. Furthermore, the Au@Ag nanoparticles showed enhanced stability against oxidation and corrosion by H2O2 with the packing of xylan. The Raman enhancement performance of xylan-capped Au@Ag nanoparticles with optimized shell thickness to 4-mercaptobenzoic acid was better than that of Au–Ag alloy, neat Au and Ag nanoparticles. The Au@Ag nanoparticles could detect 4-mercaptobenzoic acid with a greater sensitivity and its limit of detection was 1 nM. Moreover, xylan-capped Au@Ag nanoparticles could detect food contaminant like Sudan I with a limit of detection as low as 0.126 ppm. Therefore, this work not only offers a new method for high-value utilization of xylan but also presents a simple, green, and ultrasensitive surface detection technique for the assessment of food/environmental safety.

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Section: Introductionmentioning

confidence: 99%

Green and Controllable Synthesis of Au–Ag Bimetal Nanoparticles by Xylan for Surface-Enhanced Raman Scattering

Cai

Liu

et al. 2019

ACS Sustainable Chem. Eng.

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“…The metal seeds can be utilized or collected in the initial reaction medium before being distributed to another medium. [28,29] It is worth pointing out, however, that the specific function performed by the seeds in those early researches was rather ambiguous. It was not until a few years later that scientists realized there was a direct connection between the crystallinity or internal structure of a seed and the prospective of a metal NP.…”

Section: The Influence Of Seedsmentioning

confidence: 99%

Recent Advances of Seed‐Mediated Growth of Metal Nanoparticles: from Growth to Applications

et al. 2023

Advanced Materials

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Unprecedented advances in metal nanoparticle synthesis have paved the way for broad applications in sensing, imaging, catalysis, diagnosis and therapy by tuning optical properties, enhancing catalytic performance, and improving chemical and biological properties of metal nanoparticles. The central guiding concept for regulating the size and morphology of metal nanoparticles has been identified as the precise manipulation of nucleation and subsequent growth, often known as seed‐mediated growth methods. However, since the growth process is sensitive not only to the metal seeds but also to capping agents, metal precursors, growth solution, growth/incubation time, reductant and other influencing factors, the precise control of metal nanoparticle morphology is multifactorial. Further, multiple reaction parameters are entangled with each other, so it is necessary to clarify the mechanism by which each factor precisely regulates the morphology of metal nanoparticles. In this review, to exploit the generality and extendibility of metal nanoparticle synthesis, we systematically summarized the mechanism of growth influencing factors in seed‐mediated growth methods. Second, we focus on a variety of critical properties and applications enabled by grown metal nanoparticles. Finally, we review the current progress and offer insights on the challenges, opportunities, and future directions for the growth and applications of grown metal nanoparticles.This article is protected by copyright. All rights reserved

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“…However, a few studies on NiZn alloys focus on their MOR performance. In addition, enormous reported studies indicate that the electrocatalytic properties greatly depend on the morphology and structure of catalysts. − It is noted that catalysts with well-defined structures, such as one-dimensional (1D) nanowires, two-dimensional (2D) nanosheets, and three-dimensional (3D) foams, could efficiently boost electrocatalytic performances because they possess abundant favorable active reaction sites and high structural stability and can facilitate the mass diffusion/transport of reactants in solution as well as transfer of electrons. − Thus, developing well-defined bimetallic NiZn alloys to boost the MOR performance is highly desired, although a gap still remains.…”

Section: Introductionmentioning

confidence: 99%

Rational Design of NiZn_x@CuO Nanoarray Architectures for Electrocatalytic Oxidation of Methanol

Han

Yang

et al. 2023

ACS Appl. Mater. Interfaces

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Methanol oxidation reaction (MOR) in anodes is one of the significant aspects of direct methanol fuel cells (DMFCs), which also plays a critical role in achieving a carbon-neutral economy. Designing and developing efficient, cost-effective, and durable non-Pt group metal-based methanol oxidation catalysts are highly desired, but a gap still remains. Herein, we report well-defined hierarchical NiZn x @CuO nanoarray architectures as active electrocatalysts for MOR, synthesized by combining thermal oxidation treatment and magnetron sputtering deposition through a brass mesh precursor. After systematically evaluating the electrocatalytic performance of NiZn x @CuO nanoarray catalysts with different preparation conditions, we found that the NiZn1000@CuO (thermally oxidized at 500 °C for 2 h, nominal thickness of the NiZn alloy film is 1000 nm) electrode delivers a high current density of 449.3 mA cm–2 at 0.8 V for MOR in alkaline media as well as excellent operation stability (92% retention after 12 h). These outstanding MOR performances can be attributed to the hierarchical well-defined structure that can not only render abundant active sites and a synergistic effect to enhance the electrocatalytic activity but also can effectively facilitate mass and electron transport. More importantly, we found that partial Zn atoms could leach from the NiZn alloy, resulting in rough surface nanorods, which would further increase the specific surface area. These results indicate that the NiZn1000@CuO nanoarray architecture could be a promising Pt group metal alternative as an efficient, cost-effective, and durable anode catalyst for DMFCs.

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Origin of symmetry breaking in the seed-mediated growth of bi-metal nano-heterostructures

Cited by 12 publications

References 66 publications

Green and Controllable Synthesis of Au–Ag Bimetal Nanoparticles by Xylan for Surface-Enhanced Raman Scattering

Green and Controllable Synthesis of Au–Ag Bimetal Nanoparticles by Xylan for Surface-Enhanced Raman Scattering

Recent Advances of Seed‐Mediated Growth of Metal Nanoparticles: from Growth to Applications

Rational Design of NiZn_x@CuO Nanoarray Architectures for Electrocatalytic Oxidation of Methanol

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Origin of symmetry breaking in the seed-mediated growth of bi-metal nano-heterostructures

Cited by 12 publications

References 66 publications

Green and Controllable Synthesis of Au–Ag Bimetal Nanoparticles by Xylan for Surface-Enhanced Raman Scattering

Green and Controllable Synthesis of Au–Ag Bimetal Nanoparticles by Xylan for Surface-Enhanced Raman Scattering

Recent Advances of Seed‐Mediated Growth of Metal Nanoparticles: from Growth to Applications

Rational Design of NiZnx@CuO Nanoarray Architectures for Electrocatalytic Oxidation of Methanol

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Product

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Rational Design of NiZn_x@CuO Nanoarray Architectures for Electrocatalytic Oxidation of Methanol