Silver nanoplates prepared by modified galvanic displacement for surface-enhanced Raman spectroscopy

Lai, Yongchao; Pan, Wenxiao; Zhang, Dongju; Zhan, Jinhua

doi:10.1039/c0nr01030h

Cited by 66 publications

(48 citation statements)

References 26 publications

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“…In addition, Lai et al . demonstrated that Ag nanoplates were formed when Ag displacement on a Cu foil substrate was performed with the addition of NA …”

Section: Introductionmentioning

confidence: 99%

Ag Displacement on Cu Foam with Additives for Electrochemical Reduction of Carbon Dioxide to Carbon Monoxide

Lee

Ahn

2017

Bulletin Korean Chem Soc

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For electrochemical reduction of carbon dioxide to carbon monoxide, an Ag catalyst supported by Cu foam was prepared electrochemically by bubble-templated Cu electrodeposition and subsequent Ag galvanic displacement. The morphology and crystal structure of the displaced Ag on the Cu foam varied significantly depending on the type of additive. Electrochemical analysis revealed variations in the electrochemical surface area and different Ag and Cu surface compositions depending on the type of additive used in the Ag galvanic displacement step. Among the prepared Ag/Cu foams, the foam having the highest Ag(220)/Ag(111) ratio exhibited the highest CO Faradaic efficiency at a certain constant potential. In the potential range between −0.46 and −0.96 V RHE , the Ag(220)/Ag(111) ratio significantly affected the normalized CO partial current, showing the importance of control of a certain facet in the Ag crystal structure by the additives.

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“…In addition, Lai et al . demonstrated that Ag nanoplates were formed when Ag displacement on a Cu foil substrate was performed with the addition of NA …”

Section: Introductionmentioning

confidence: 99%

Ag Displacement on Cu Foam with Additives for Electrochemical Reduction of Carbon Dioxide to Carbon Monoxide

Lee

Ahn

2017

Bulletin Korean Chem Soc

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“…因此许多研究已经致力于在纳米材料结构的表面上获得更多、更均匀的 SERS 活性"热点"来提高其检测灵敏度 [16～19] . 与其他金属纳米材料相比, 银纳米材料具有形貌易调控以及较强的表面等离子共振效应 (SPR)特性等特点, 因而可作为良好的 SERS 活性基底 [20] . 例如 Chen 等 [21] 利用溶剂热法成功的获得了银纳米颗粒修饰的银纳米线结构, 对三聚氰胺的 SERS 检测表明这种结构的 SERS 基底具有很高灵敏度和较好的重现性.…”

Section: 近年来由于表面增强拉曼光谱(Surface-enhancedunclassified

Fabrication of Silver Nanowires with Corrugated-Surface and Its SERS Performance

Chen¹,

Aiwu²,

Gao³

et al. 2014

Acta Chim. Sinica

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In order to create the effective number of surface-enhanced Raman scattering (SERS) active "hot spots" on the one-dimensional nanostructure surfaces for ensuring the maximum enhancement of SERS signal, smooth silver nanowires (Ag NWs) were firstly synthesized by the conventional polyol method, and then the smooth silver nanowires were subjected to chemical etching by the Fe(NO 3 ) 3 aqueous solution at room temperature to obtain corrugated silver nanowires. This corrugated silver nanowires were systematically characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) microscopy, Ultraviolet-visible (UV-vis) extinction spectroscopy and surface enhanced Raman spectroscopy (SERS). The SEM image of smooth silver nanowires shows that had a diameter of ca. 120 nm and lengths of about tens of micrometers, while the average thickness of corrugated nanowires was only about 100 nm. The XRD patterns for both smooth and corrugated silver nanowires indicate that the fcc structure was preserved after chemical etching. From the measurement of UV-vis spectra we can see that after the smooth silver nanowires were subjected to chemical etching, only one broad surface plasmon peak was observed at ca. 386 nm while two significant peaks were observed at 353 and 392 nm for the smooth silver nanowires. The slight blue-shift of this peak from 392 to 386 nm could be contributed by the decrease in diameter of silver nanowires, whereas the broadening of the plasmon peak was probably a result of increased surface roughness. The SEM images showed that the surface roughness of silver nanowires was dependent on the amount of Fe(NO 3 ) 3 , by increasing the amount of Fe(NO 3 ) 3 added into the silver nanowires solution, the surface of silver nanowires become more and more rough. However, as the excess amount of etchant added, most silver nanowires would broke off into shorter rods, and even spherical particles. Raman analyses of crystal violet (CV) indicated that the SERS intensity changes depending on the surface roughness of etched silver nanowires, and the silver nanowires with corrugated surfaces exhibited higher enhancement of SERS signal than the smooth silver nanowires. In addition, the SERS detection of CV and 4-mercaptopyridine (4-Mpy) molecules exhibited high detection sensitivity and the detection concentration were as low as 10 -10 and 10 -9 mol/L, respectively, which means that the corrugated silver nanowires could be an efficient SERS active substrate.

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“…The presence of larger catalytic sites in the reaction mixture increases the effective collision frequency, and hence the rate of reaction is also increased. In order to investigate the effect of amount of reducing agent on the reduction rate, different amounts of NaBH 4 were used by assuming all other parameters constants. To assess the effect of NaBH 4 on the reduction rate, different amounts of NaBH 4 (0.1-0.5 M) were used in reduction of 4-NP.…”

Section: The Catalytic Activity Of P(aa)-ag Toward the Oxidation Rementioning

confidence: 99%

“…Silver nanoparticles, NPs, are versatile building blocks with strong surface plasmon resonance, high electrical, optical and high surface-to-volume ratio [1,2] that makes them an interesting subject in electronics, [3] surface enhanced Raman spectroscopy, [4] sensing, [5] and catalysis. [6] However, the aggregation of these nanoparticles due to their high surface charge and surface to volume ratio, decreases their surface area, [7] which results in a decrease in their catalytic activity.…”

Section: Introductionmentioning

confidence: 99%

Ag‐nanoparticle embedded p(AA) hydrogel as an efficient green heterogeneous Nano‐catalyst for oxidation and reduction of organic compounds

Ghorbanloo

Heydari

Yahiro

2017

Applied Organom Chemis

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P(AA)‐Ag heterogeneous catalyst system comprised of Ag nanoparticles embedded within hydrogel matrices has been described for the selective aerobic oxidation of alcohols and reduction of nitro phenols in water. P(AA)‐Ag nanocomposite was characterized by Fourier transform infrared (FT‐IR), scanning electron microscopy (SEM), transmission electron microscopy (TEM), thermal gravimetric analysis (TGA), X‐Ray photoelectron spectroscopy (XPS) and inductively coupled plasma atomic emission spectrometer (ICP). Catalytic activity of p(AA)‐Ag catalyst was investigated in the aerobic oxidation of primary alcohols and reduction of nitro compounds by emphasizing the effect of different parameters such as temperature, catalyst amount, substituent effect, etc. The catalyst was easily recovered from the reaction medium and it could be re‐used for other three runs without significant loss of activity.

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Silver nanoplates prepared by modified galvanic displacement for surface-enhanced Raman spectroscopy

Cited by 66 publications

References 26 publications

Ag Displacement on Cu Foam with Additives for Electrochemical Reduction of Carbon Dioxide to Carbon Monoxide

Ag Displacement on Cu Foam with Additives for Electrochemical Reduction of Carbon Dioxide to Carbon Monoxide

Fabrication of Silver Nanowires with Corrugated-Surface and Its SERS Performance

Ag‐nanoparticle embedded p(AA) hydrogel as an efficient green heterogeneous Nano‐catalyst for oxidation and reduction of organic compounds

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