Particle‐Arrayed Silver Mesocubes Synthesized via Reducing Silver Oxide Mesocrystals for Surface‐Enhanced Raman Spectroscopy

Yang, Zhongbo; Zhang, Lei; You, Hongjun; Li, Zhiyuan; Fang, Jixiang

doi:10.1002/ppsc.201300290

Cited by 24 publications

(25 citation statements)

References 55 publications

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“…Although high‐energy methods are able to construct large‐scale, high‐strength objects, they are not feasible for micro/nanoscale fabrication due to their precision limitation and the requirement for high‐energy source. Significant effort has been devoted to exploring methods for low‐temperature fabrication of metal nanostructures . Fluid‐interface‐assisted fabrication still remains as one of the few, if not the only, available methods to fabricate multi‐scale well‐designed structures out of metal particles .…”

mentioning

confidence: 99%

Thin, Porous, and Conductive Networks of Metal Nanoparticles through Electrochemical Welding on a Liquid Metal Template

Tang

Zhao

et al. 2018

Adv Materials Inter

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interfacial forces, [6][7][8] surface modifications, [9,10] as well as well-controlled external fields [11][12][13][14][15] have been adopted, which yield vast types of complex yet delicate particle structures with outstanding functionalities. By virtue of interfacial forces, fluid-interface-assisted self-assembly (or self-organization) has been proven to be a simple yet powerful method. [6,7,11,[16][17][18][19][20][21][22][23] Although self-assembled particle structures are stable at the confining template, losing interfacial confinements causes immediate breakdown because the particles are not physically connected. For limited types of particles, for instance polymeric particles, a sintering process at elevated temperature has been performed for stabilization purpose. [17][18][19][20] Metal particles represent another important group of particle materials that offer numerous editable properties stemming from both the diversity of metals and their hierarchical size effects. High-melting-point metal particles can only be molded at exceedingly high temperatures through methods such as laser or electron-beam-assisted additive manufacturing [24] and liquid phase sintering. [25] Although highenergy methods are able to construct large-scale, high-strength objects, they are not feasible for micro/nanoscale fabrication due to their precision limitation and the requirement for highenergy source. Significant effort has been devoted to exploring methods for low-temperature fabrication of metal nanostructures. [26][27][28][29][30][31] Fluid-interface-assisted fabrication still remains as one of the few, if not the only, available methods to fabricate multi-scale well-designed structures out of metal particles. [32][33][34][35] Unfortunately, interfacial metal particles cannot be sintered under moderate temperature range due to their intrinsic highmelting metallic nature.To address this challenge, here we propose a particle cross-linking strategy that can stabilize interfacial metal particle structures at room temperature. We show that discrete copper nanoparticles (Cu NPs) can be cross-linked to form continuous porous phases at a liquid metal (LM)-electrolyte template, which is electrochemically reducing. In reminiscence of the high-energy metallurgical welding, we call this in-solution particle cross-linking process "electrochemical welding". We conduct surface composition analyses to clarify the underlying mechanisms. We also characterize the mechanical properties and the electrical properties Manipulating particles using a fluid interface has both fundamental implications and technological promises. However, the stabilization of interfacial particle structures remains challenging. This study proposes a room-temperature particle cross-linking strategy achieved by introducing a surface transition process to metal particles confined at a liquid metal-electrolyte template, which is electrochemically reducing. The method enables cross-linking Cu nanoparticles into nanoporous networks of micrometric thickness. It is shown that...

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mentioning

confidence: 99%

Thin, Porous, and Conductive Networks of Metal Nanoparticles through Electrochemical Welding on a Liquid Metal Template

Tang

Zhao

et al. 2018

Adv Materials Inter

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“…The EF was found to be ≈1–5 × 10 5 for 10 −7 and 10 −6 M concentrations, while for lower concentrations, it changed drastically. These values are lower than the EF of 10 9 reported for 10 −9 –10 −12 M aliquots of crystalline violet deposited on mesoporous silver mesocrystals enhanced with a 633 nm He–Ne laser [ 23 ].…”

Section: Resultsmentioning

confidence: 62%

“…Such analyses require specific SERS substrates with a high surface area, hierarchical surface structure and the presence of multiple plasmon bands (“polycolor” plasmons) in the visible range. For this, some prospective but technically complicated approaches were proposed elsewhere [ 20 – 22 ] while synthesis of mesoporous materials could be an alternative and easier solution [ 23 ]. Porous silver or gold materials of large specific surface area could be regarded as new metal plasmonic systems with complex architecture [ 24 ].…”

Section: Introductionmentioning

confidence: 99%

Facile chemical routes to mesoporous silver substrates for SERS analysis

Tastekova

Polyakov

Goldt

et al. 2018

Beilstein J. Nanotechnol.

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Mesoporous silver nanoparticles were easily synthesized through the bulk reduction of crystalline silver(I) oxide and used for the preparation of highly porous surface-enhanced Raman scattering (SERS)-active substrates. An analogous procedure was successfully performed for the production of mesoporous silver films by chemical reduction of oxidized silver films. The sponge-like silver blocks with high surface area and the in-situ-prepared mesoporous silver films are efficient as both analyte adsorbents and Raman signal enhancement mediators. The efficiency of silver reduction was characterized by X-ray diffraction and X-ray photoelectron spectroscopy. The developed substrates were applied for SERS detection of rhodamine 6G (enhancement factor of about 1–5 × 105) and an anti-ischemic mildronate drug (meldonium; enhancement factor of ≈102) that is known for its ability to increase the endurance performance of athletes.

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“…Their proposed formation pathway includes nano-sized primary particles that go through mesoscale assembly with crystallographic coorientation to produce mesocrystals 30 . Fang et al proposed this mechanism for the formation of a variety of silver crystal morphologies, such as plate-like structures 31 , dendrites 32 , spherulites 33 , mesocages 34 and mesocubes 35 by either aqueous crystallization or a sacrificial template method.…”

Section: Introductionmentioning

confidence: 99%

Precipitation of silver particles with controlled morphologies from aqueous solutions

2020

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Particle‐Arrayed Silver Mesocubes Synthesized via Reducing Silver Oxide Mesocrystals for Surface‐Enhanced Raman Spectroscopy

Cited by 24 publications

References 55 publications

Thin, Porous, and Conductive Networks of Metal Nanoparticles through Electrochemical Welding on a Liquid Metal Template

Thin, Porous, and Conductive Networks of Metal Nanoparticles through Electrochemical Welding on a Liquid Metal Template

Facile chemical routes to mesoporous silver substrates for SERS analysis

Precipitation of silver particles with controlled morphologies from aqueous solutions

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