In situ deposition of gold nanostructures with well-defined shapes on unfunctionalized reduced graphene oxide through chemical reduction of a dry gold precursor with ethylene glycol vapor

Cho, Swee Jen; Suri, Anil; Mei, Xiaoguang; Ouyang, Jianyong

doi:10.1039/c2ra21854b

Cited by 12 publications

(11 citation statements)

References 63 publications

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“…However, it is possible to direct the growing film toward more exotic morphologies, for example by the addition of catalysts to the substrate to template nanowire − or nanotube growth. , Vapor–liquid–solid (VLS)-type growth with gold as the eutectic partner has also been employed to grow nanowires, rods, and more complex structures. − While these methods have been heavily researched, the ability to synthesize specific shapes of gold metal nanocrystals by CVD has only been reported a few times. Methods used mainly involve pyrolysis of chloroauric acid , or surface templating. , …”

Section: Introductionmentioning

confidence: 99%

Surfactant Directed Growth of Gold Metal Nanoplates by Chemical Vapor Deposition

et al. 2015

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Surface-supported, low-dimensional gold nanostructures are of interest for plasmonic applications. Low dimensional nanostructures are readily accessible by solution-phase growth, where shape control through the addition of growthdirecting surfactants is well established. Yet, shape control in chemical vapour deposition (CVD) has not been well explored, and metallic gold films are typically limited to nanoparticulate or thin film morphologies. This article describes the self-seeded growth of high aspect ratio gold plates and wires by CVD. A directed growth mechanism is proposed, where growth is directed by the coordinating N-heterocyclic carbene (NHC) and phosphine ligands originating from the thermal decomposition of the two gas-phase precursors, [Au(HMDS)(NHC)] (HMDS = hexamethyldisilazide, NHC = 1,3-diisopropyl-imidazolidin-2-ylidene) and [Au(HMDS)(PMe 3 )]. These ligands acted as transient surfactants for plate growth between 370 and 460°C and at high precursor flux. Energy dispersive X-ray spectroscopy (EDS) and X-ray photoelectron spectroscopy (XPS) evidence indicates that hydroxyl terminated substrate surfaces are passivated with trimethylsilyl (TMS) moieties originating from the HMDS ligand in both precursors, which promoted island type growth and directed precursor decomposition to occur on gold surfaces. Secondary nucleation is observed on all gold structures, and is a crucial component to gas-phase surfactant-mediated CVD growth. This work identifies the potential to use precursor-bound coordinative ligands or gas-phase surfactants to direct growth of metal nanocrystals by CVD.

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Section: Introductionmentioning

confidence: 99%

Surfactant Directed Growth of Gold Metal Nanoplates by Chemical Vapor Deposition

et al. 2015

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“…Considering the 2D planar characteristic of GO, the formation of Au 2D nanostructures was likely to be templated by GO. According to some references, Au NS/GO composites were prepared by immobilization of the Au precursor or the reducing agent on the GO surface − so that Au could grow toward 2D nanostructures by taking GO as the template. In these cases, through anchoring one of the reaction species on the GO planes, the free growth of Au in the directions other than along the GO plane was prevented, so that GO could play the role of the template to induce the 2D growth of Au.…”

Section: Results and Discussionmentioning

confidence: 99%

“…The electrical conductivity of composites can be greatly improved after GO is reduced to rGO . Moreover, studies revealed that GO contributes to improving surface-enhanced Raman spectroscopy (SERS) activity through chemical enhancement for Au–GO composites. , To date, there are several strategies to produce anisotropic Au nanostructures on graphene derivatives. ,− Huang et al reported an in situ synthesis of ultrathin Au nanowires (NWs) on GO sheets by using 1-amino-9-octadecene adsorbed on the GO surface as the reducing agent for AuCl 4 – as well as the 1D structure-directing agent . Zhang et al fabricated Au nanoplate/GO composites using tannic acid as the reducing agent for Au precursor and the immobilizing agent on GO surfaces .…”

Section: Introductionmentioning

confidence: 99%

Simultaneous Synthesis of One-and Two-Dimensional Gold Nanostructures/Reduced Graphene Oxide Composites in the Redox-Active Ionic Liquid/Water Interfacial System

2020

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“…In addition, the agglomeration of Au NSs can also lower the efficiency of catalytic reactions [32,33,34]. Recently, vapor-phase synthesis of Au NSs has emerged as a promising synthesis technique because vapor-phase synthetic methods can produce surfactant-free, single-crystalline, ultraclean, ultraflat, and morphology-tunable Au NSs [35,36,37,38,39]. Although the Au NSs synthesized in a vapor phase exhibit excellent physicochemical properties, they have rarely been applied to electrocatalytic reactions because vapor-phase-grown Au NSs are mainly deposited on nonconductive and temperature-stable substrates.…”

Section: Introductionmentioning

confidence: 99%

Low-Temperature Vapor-Phase Synthesis of Single-Crystalline Gold Nanostructures: Toward Exceptional Electrocatalytic Activity for Methanol Oxidation Reaction

et al. 2019

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Au nanostructures (Au NSs) have been considered promising materials for applications in fuel cell catalysis, electrochemistry, and plasmonics. For the fabrication of high-performance Au NS-based electronic or electrochemical devices, Au NSs should have clean surfaces and be directly supported on a substrate without any mediating molecules. Herein, we report the vapor-phase synthesis of Au NSs on a fluorine-doped tin oxide (FTO) substrate at 120 °C and their application to the electrocatalytic methanol oxidation reaction (MOR). By employing AuCl as a precursor, the synthesis temperature for Au NSs was reduced to under 200 °C, enabling the direct synthesis of Au NSs on an FTO substrate in the vapor phase. Considering that previously reported vapor-phase synthesis of Au NSs requires a high temperature over 1000 °C, this proposed synthetic method is remarkably simple and practical. Moreover, we could selectively synthesize Au nanoparticles (NPs) and nanoplates by adjusting the location of the substrate, and the size of the Au NPs was controllable by changing the reaction temperature. The synthesized Au NSs are a single-crystalline material with clean surfaces that achieved a high methanol oxidation current density of 14.65 mA/cm2 when intimately supported by an FTO substrate. We anticipate that this novel synthetic method can widen the applicability of vapor-phase synthesized Au NSs for electronic and electrochemical devices.

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In situ deposition of gold nanostructures with well-defined shapes on unfunctionalized reduced graphene oxide through chemical reduction of a dry gold precursor with ethylene glycol vapor

Cited by 12 publications

References 63 publications

Surfactant Directed Growth of Gold Metal Nanoplates by Chemical Vapor Deposition

Surfactant Directed Growth of Gold Metal Nanoplates by Chemical Vapor Deposition

Simultaneous Synthesis of One-and Two-Dimensional Gold Nanostructures/Reduced Graphene Oxide Composites in the Redox-Active Ionic Liquid/Water Interfacial System

Low-Temperature Vapor-Phase Synthesis of Single-Crystalline Gold Nanostructures: Toward Exceptional Electrocatalytic Activity for Methanol Oxidation Reaction

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