Electrochemical synthesis of gold nanocubes

Huang, Chien Jung; Wang, Yeong-Her; Chiu, Pin Hsiang; Shih, Ming Chang; Meen, Teen Hang

doi:10.1016/j.matlet.2005.12.045

Cited by 66 publications

(48 citation statements)

References 17 publications

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“…[5][6][7] In general, the chemical synthesis route is more developed than the electrochemical one, as it allows better control of the final type of NPs. 5,8,9 However, a number of studies have shown that it is also possible to control Au NPs morphology using electrochemistry, [10][11][12][13][14][15][16] although a lot of them use a gold sacrificial anode like source of gold ions. [13][14][15] Electrochemical synthesis offers important advantages such as the production of NPs with high purity.…”

Section: Introductionmentioning

confidence: 99%

“…5,8,9 However, a number of studies have shown that it is also possible to control Au NPs morphology using electrochemistry, [10][11][12][13][14][15][16] although a lot of them use a gold sacrificial anode like source of gold ions. [13][14][15] Electrochemical synthesis offers important advantages such as the production of NPs with high purity. 3 With chemical synthesis is possible to obtain well-defined NPs controlling the ratio between the reductive agent, gold precursor and protective agent.…”

Section: Introductionmentioning

confidence: 99%

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Spectroelectrochemical synthesis of gold nanoparticles using cyclic voltammetry in the presence of a protective agent

et al. 2014

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Modification of electrodes with metal nanoparticles (NPs) is attracting intense interest because the widespread applications of these electrodes as sensors in electroanalysis. In the present study, we have analysed the electrodeposition of gold nanoparticles (Au NPs) on a platinum electrode in presence of polyvinylpyrrolidone using UV/Vis spectroelectrochemistry, which allows us to obtain in-situ evidences on the kind of nanoparticles deposited on the electrode. Under the selected experimental conditions, it has been possible to understand the reaction pathway for the synthesis of Au NPs in a voltammetry experiment. We establish that generation of NPs of a specific size is dramatically favoured during the different oxidation and reduction processes. Experiments with and without protective agent revealed that NPs generation is favoured since the first cycle when a protective agent is present in solution. IntroductionSynthesis of noble-metal nanoparticles (NPs) has received significant attention in recent years. [1][2][3][4] The ability to generate NPs with controlled size and shape is very important to advance in many areas of science and technology. In fact, scientists are beginning to understand the complex physics that leads to the generation of NPs with controlled size and shape. [5][6][7] In general, the chemical synthesis route is more developed than the electrochemical one, as it allows better control of the final type of NPs. 5,8,9 However, a number of studies have shown that it is also possible to control Au NPs morphology using electrochemistry, 10-16 although a lot of them use a gold sacrificial anode like source of gold ions.13-15 Electrochemical synthesis offers important advantages such as the production of NPs with high purity. 3 With chemical synthesis is possible to obtain well-defined NPs controlling the ratio between the reductive agent, gold precursor and protective agent. 5,8,9 On the other hand, electrochemical synthesis is very interesting to understand the mechanism of NPs generation because it is possible to control easily the potential at which the reaction takes place.In the case of the electrochemical synthesis, the reaction mechanism can be better understood when in-situ characterization techniques are coupled to electrochemistry to provide more information about the process that is taking place. [17][18][19][20][21] Here electrochemistry is combined with UV/Vis absorption spectroscopy to follow the formation of Au NPs. UV/Vis spectroelectrochemistry provides mechanistic information on Au NPs synthesis because the electrochemical process can be easily followed by observing gold characteristic plasmon band. 2,22 Recently, we have demonstrated that a multipulse technique yields monodisperse spherical Au NPs. 19This method was based on the application of several consecutive oxidation/reduction steps. In order to understand better the electrochemical process, here we have developed a new synthesis route based on cyclic voltammetry, where reduction and oxidation potentials are alternated d...

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Spectroelectrochemical synthesis of gold nanoparticles using cyclic voltammetry in the presence of a protective agent

et al. 2014

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“…Gold nanowires and nanosheets have been synthesised through chemical reduction method in bulk block copolymer matrix under mild conditions by Kim et al [9]. Besides these, nanotriangles [10][11][12], nanoprisms [13], nanooctahedra [14], nanotubes [15], nanopyramids [16], nanocubes [17], nanotripods [18], nanoicosahedra [19], etc. are some of the interesting shapes of gold nanoparticles that have been prepared using the chemical reduction method.…”

Section: Introductionmentioning

confidence: 99%

“…Various toxic organic surfactants or solvents are being used as surface passivator during the synthesis of gold nanoparticles either through conventional solution phase chemical reduction [20] or electrochemical [17,21] reduction methods. These organic surface passivators cause pollution and environmental hazards.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of gold nanoparticles of variable morphologies using aqueous leaf extracts ofCocculus hirsutus

Bar

Bhui

Sahoo

et al. 2012

Journal of Experimental Nanoscience

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Spherical, triangular (prismatic) and square plate shaped gold nanoparticles have been synthesised from HAuCl 4 Á 3H 2 O solution using the aqueous leaf extract of Cocculus hirsutus. Nanoparticles are characterised using higher resolution transmission electron microscope, X-ray diffraction and UV-Vis absorption spectroscopic study. FT-IR analysis reveals that the gold nanostructures are mostly stabilised by the carbonyl and amide groups present in the active component of C. hirsutus leaf extract. Formation of gold nanostructures of variable morphologies has been explained due to slow reduction of gold ions by the mild reducing ascorbic acid present within the extract and this controlled reduction assists the preferential deposition of Au atom on different lesserprotected faces of initially grown gold nanostructure.

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“…Furthermore, the optical properties of these nanostructures can readily be tailored by controlling their size, shape, composition, and/or interior (hollow vs. solid) [8][9][10][11]. For solid gold nanostructures, chemical reduction or thermal decomposition routes have been used to achieve many different shapes, including nanowires [12], nanorods [13][14][15], nanospheres [16], nanoplates [17][18][19], and nanocubes [20][21][22], among others [23][24][25]. Recently, the galvanic replacement reaction has been demonstrated as a remarkably simple and versatile route to gold hollow nanostructures with tunable LSPR properties [26].…”

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confidence: 99%

Gold Nanocages: A Multifunctional Platform for Molecular Optical Imaging and Photothermal Treatment

Cobley

Chen

et al. 2011

Nanoplatform‐Based Molecular Imaging

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Gold nanocages are single-crystalline, hollow structures with porous walls. They are commonly prepared using the galvanic replacement reaction between silver nanocubes and a gold salt precursor. By controlling the amount of gold precursor added, we can tune localized surface plasmon resonance peaks of the resultant gold nanocages into the near-infrared, where the attenuation of light by blood and soft tissue is negligibly low. Calculations based on the discrete dipole approximation method indicate that both the absorption and scattering cross sections of gold nanocages can be up to five orders in magnitude stronger than molecular dyes. In addition, gold nanocages are biocompatible and their surface can easily be modified through the gold-thiolate monolayer chemistry. All these tributes make gold nanocages a novel class of molecular agents for optical bioimaging and photothermal treatment. In this chapter, we present some recent advances in the synthesis and utilization of gold nanocages. Specifically, it will be shown that the optical properties of gold nanocages can be tailored for use as molecular contrast agents in both optical and spectroscopic coherence tomography (OCT and SOCT, respectively), as well as photoacoustic tomography (PAT). Our studies suggest strong enhancement in contrast when gold nanocages were added to tissue phantom for OCT and SOCT. For PAT imaging, we demonstrated that gold nanocages could enhance the optical absorption of vasculature by up to 81%. Additionally, the nanocages were used as tracers for noninvasively mapping the location of sentinel lymph nodes for breast cancer staging. Lastly, when nanocages were modified with tumor-targeting ligands, they were effective in the photothermal ablation of cancer cells.

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Electrochemical synthesis of gold nanocubes

Cited by 66 publications

References 17 publications

Spectroelectrochemical synthesis of gold nanoparticles using cyclic voltammetry in the presence of a protective agent

Spectroelectrochemical synthesis of gold nanoparticles using cyclic voltammetry in the presence of a protective agent

Synthesis of gold nanoparticles of variable morphologies using aqueous leaf extracts ofCocculus hirsutus

Gold Nanocages: A Multifunctional Platform for Molecular Optical Imaging and Photothermal Treatment

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