Facile Synthesis of Uniform Raspberry-Like Gold Nanoparticles for High Performance Surface Enhanced Raman Scattering

Rong, Yun; Zhang, Lei; Liu, Zhenzhong; Dai, Liyi; Huang, Youju; Chen, Tao

doi:10.1166/jnn.2016.11723

Cited by 7 publications

(3 citation statements)

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“…Subsequently, small Cu nanocrystals begin to emerge as the redox reaction proceeds, while the oxidation product dehydroascorbic acid is adsorbed onto Cu through coordination bonds, giving negatively charged Cu nanocrystals due to ionization of the multi-hydroxyl structure, and the zeta potential of copper particles which were coated by the oxidation product of L-ascorbic acid is −11.8 mV (figure S5). Finally, electrostatic interactions between the PVP chains and the Cu crystal nucleus result in orderly aggregation of the newly-formed Cu nanocrystals on the surface of Cu 2 O, and this is followed by further crystal growth through Ostwald ripening, giving a straw-like Cu building block [37,38]. The reaction proceeded until the Cu 2 O template was completely consumed, leading to the formation of the hollow hierarchical Cu architecture.…”

Section: Growth Mechanism Of the Hierarchical Cu Architecturementioning

confidence: 99%

Facile and scalable fabrication of self-assembled Cu architecture with superior antioxidative properties and improved sinterability as a conductive ink for flexible electronics

Zhu

et al. 2019

Nanotechnology

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The inherent susceptibility to oxidation and poor sinterability significantly limit the practical application of Cu-based conductive inks. Most methodologies employed for the inks like organic polymer coatings and inorganic metal deposition are generally ineffective. Herein, we report the design of a novel hierarchical Cu architecture to simultaneously improve the antioxidative and sinterability via a self-passivation mechanism and loose interior structures. The hierarchical Cu architecture was prepared using copper hydroxide, L-ascorbic acid, and polyvinylpyrrolidone in aqueous solution; 40 g Cu were prepared in a scale-up experiment. A possible growth mechanism is proposed, involving the Cu2O-templated and mediated nucleation and growth of Cu nanocrystals, followed by the PVP-directed electrostatic self-assembly of Cu nanocrystals. The synthesized Cu shows high oxidation resistance after stored in ambient environment for 90 d by self-passivation, wherein the dense oxidized external layer prevented further oxidation of Cu, unlike other antioxidative strategies. In addition, the structure became 2D flake after a simple ball-milling for 10 min of 2000r, thus forming a good conductive network at the temperature of 180 °C. Importantly, no obvious decline in the electrical performance after severe surface oxidation. Although the structure cannot offer excellent conductive performance, but it proposes a new solution for the balance of antioxidative capabilities and good sinterability in Cu nanomaterials, thus facilitating greater utilization of Cu-based conductive inks for emerging flexible electronic applications.

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Section: Growth Mechanism Of the Hierarchical Cu Architecturementioning

confidence: 99%

Facile and scalable fabrication of self-assembled Cu architecture with superior antioxidative properties and improved sinterability as a conductive ink for flexible electronics

Zhu

et al. 2019

Nanotechnology

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“…However, the lattice constants of gold and silver are almost the same (suitability: 0.1%) [21]. Etching, dealloying corrosion kirkendall effect and pitting processes have been widely studied in high lattice match Au-Ag nanoalloys materials [22][23][24]. All Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.…”

Section: Introductionmentioning

confidence: 99%

Rational construction of Au–Ag bimetallic island-shaped nanoplates for electrocatalysis

Zhao

Liu

Xu³

et al. 2020

Mater. Res. Express

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Active electrocatalysts are the key to water splitting for hydrogen production through the electrolysis. In this paper, 50 nm silver nanoplates were used as templates for synthesis of Au-Ag island-shaped nanoplates by controlling the surface chemistry. The guiding mechanism of polyvinylpyrrolidone (PVP, Mw=40 000) to Au-Ag island-shaped nanoplates crystal was also further investigated. It is found that the surface energy of Ag nanoplates between (100) and (111) crystal planes can be regulated by varying the amount of PVP in the system. Then a uniform Au-Ag triangular island nanostructure was obtained. Compared with the Ag nanoplates catalysts, the Au-Ag island nanoplates catalysts show the superior catalytic performances in hydrogen evolution electrocatalysis (HER). These results demonstrate a new surface chemistry modification by PVP and a galvanic displacement reaction for designing the active electrocatalysts. More importantly, the Au-Ag island-shaped nanoplates show an unconventional growth mode of preserving the original Ag nano-triangular crystal structure. The enhanced performance in electrocatalysis can be mainly attributed to Au-Ag alloy structure, which allows the appearance of synergistic effects. The present work demonstrates the crucial roles of surface chemistry in catalysts synthesis, which may guide the design of active bimetallic catalysts.

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“…For tuning the size of the gold nanoparticles we use electroless deposition for different durations. Rough particles with sizes up to 120 nm in diameter are achieved in quasi-hexagonally ordered arrays, resulting in a high density of hotspots as has been shown for similar raspberry-like nanostructures [ 21 – 22 ].…”

Section: Introductionmentioning

confidence: 99%

Self-assembled quasi-hexagonal arrays of gold nanoparticles with small gaps for surface-enhanced Raman spectroscopy

Gürdal

Dickreuter

Noureddine

et al. 2018

Beilstein J. Nanotechnol.

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The fabrication and optical characterization of self-assembled arrangements of rough gold nanoparticles with a high area coverage and narrow gaps for surface-enhanced Raman spectroscopy (SERS) are reported. A combination of micellar nanolithography and electroless deposition (ED) enables the tuning of the spacing and size of the noble metal nanoparticles. Long-range ordered quasi-hexagonal arrays of gold nanoparticles on silicon substrates with a variation of the particle sizes from about 20 nm to 120 nm are demonstrated. By increasing the particle sizes for the homogeneously spaced particles, a large number of narrow gaps is created, which together with the rough surface of the particles induces a high density of intense hotspots. This makes the surfaces interesting for future applications in near-field-enhanced bio-analytics of molecules. SERS was demonstrated by measuring Raman spectra of 4-MBA on the gold nanoparticles. It was verified that a smaller inter-particle distance leads to an increased SERS signal.

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Facile Synthesis of Uniform Raspberry-Like Gold Nanoparticles for High Performance Surface Enhanced Raman Scattering

Cited by 7 publications

References 0 publications

Facile and scalable fabrication of self-assembled Cu architecture with superior antioxidative properties and improved sinterability as a conductive ink for flexible electronics

Facile and scalable fabrication of self-assembled Cu architecture with superior antioxidative properties and improved sinterability as a conductive ink for flexible electronics

Rational construction of Au–Ag bimetallic island-shaped nanoplates for electrocatalysis

Self-assembled quasi-hexagonal arrays of gold nanoparticles with small gaps for surface-enhanced Raman spectroscopy

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