Catalytic Conversion of Graphene into Carbon Nanotubes <i>via</i> Gold Nanoclusters at Low Temperatures

Dervishi, Enkeleda; Bourdo, Shawn E.; Driver, Joshua A.; Watanabe, Fumiya; Biriş, Alexandru R.; Ghosh, Anindya; Berry, Brian C.; Saini, Viney; Biris, Alexandru S.

doi:10.1021/nn203836q

Cited by 24 publications

(24 citation statements)

References 68 publications

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“…26–28 For gold nano-particles, the noncovalent interactions (i.e., hydrogen bonding and electrostatic interactions) between COOH or OH groups of graphene oxide and COO − or NH 2 groups of glutathione ligands was the driving force for nanoparticle attachments to graphene oxide. 18,27–29 …”

Section: Resultsmentioning

confidence: 99%

“…The similar changes in the plasmon bands of gold nanorods, which are caused by the plasmon coupling between AuNRs adsorbed on the graphene oxide surface, have been previously observed by Liu et al 26 When the 3 nm gold nanoparticles were adsorbed onto the graphene oxide surface, the plasmon band of gold at 520 nm also underwent an extensive broadening with a slight red shift as a result of the plasmon coupling between surface-assembled gold nano-particles (Figure 1b). 29 …”

Section: Resultsmentioning

confidence: 99%

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Graphene Oxide-Promoted Reshaping and Coarsening of Gold Nanorods and Nanoparticles

Pan

Low

Weerasuriya

et al. 2015

ACS Appl. Mater. Interfaces

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This paper describes thermally induced reshaping and coarsening behaviors of gold nanorods and nanoparticles immobilized on the surface of graphene oxide. Cetyltrimethylammonium bromide-stabilized gold nanorods with an aspect ratio of ~3.5 (54:15 nm) and glutathione-capped gold nanoparticles with an average core size of ~3 nm were synthesized and self-assembled onto the surface of graphene oxide. The hybrid materials were then heated at different temperatures ranging from 50 to 300 °C. The effects of heat treatments were monitored using UV–vis spectroscopy and transmission electron microscopy (TEM). These results were directly compared with those of heat-treated free-standing gold nanorods and nanoparticles without graphene oxide to understand the heat-induced morphological changes of the nanohybrids. The obtained results showed that the gold nanorods would undergo a complete reshaping to spherical particles at the temperature of 50 °C when they are assembled on graphene oxide. In comparison, the complete reshaping of free-standing gold nanorods to spherical particles would ultimately require a heating of the samples at 200 °C. In addition, the spherical gold nanoparticles immobilized on graphene oxide would undergo a rapid coarsening at the temperature of 100–150 °C, which was lower than the temperature (150–200 °C) required for visible coarsening of free-standing gold nanoparticles. The results indicated that graphene oxide facilitates the reshaping and coarsening of gold nanorods and nanoparticles, respectively, during the heat treatments. The stripping and spillover of stabilizing ligands promoted by graphene oxide are proposed to be the main mechanism for the enhancements in the heat-induced transformations of nanohybrids.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Graphene Oxide-Promoted Reshaping and Coarsening of Gold Nanorods and Nanoparticles

Pan

Low

Weerasuriya

et al. 2015

ACS Appl. Mater. Interfaces

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“…To demonstrate other potential applications of super‐resolution PTM, we analyzed flakes of graphene with two to three layers decorated with 10–20‐nm spherical gold NPs at distances in the range of 20–60 nm ( Figure a) 34. Both unmodified and NP‐decorated graphene samples demonstrated high stability under the laser beam and withstood a laser fluence exceeding 5 J cm −2 (Figure S5, Supporting Information).…”

Section: Resultsmentioning

confidence: 99%

Super‐Resolution Nonlinear Photothermal Microscopy

Nedosekin

Galanzha

Dervishi

et al. 2013

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Super-resolution fluorescence microscopy enables imaging of fluorescent structures beyond the diffraction limit. However, this technique cannot be applied to weakly fluorescent cellular components or labels. As an alternative, photothermal microscopy based on nonradiative transformation of absorbed energy into heat has demonstrated imaging of nonfluorescent structures including single molecules and ~1-nm gold nanoparticles. However, previously photothermal imaging has been performed with a diffraction-limited resolution only. Herein, super-resolution, far-field photothermal microscopy based on nonlinear signal dependence on the laser energy is introduced. Among various nonlinear phenomena, including absorption saturation, multiphoton absorption, and signal temperature dependence, signal amplification by laser-induced nanobubbles around overheated nano-objects is explored. A Gaussian laser beam profile is used to demonstrate the image spatial sharpening for calibrated 260-nm metal strips, resolving of a plasmonic nanoassembly, visualization of 10-nm gold nanoparticles in graphene, and hemoglobin nanoclusters in live erythrocytes with resolution down to 50 nm. These nonlinear phenomena can be used for 3D imaging with improved lateral and axial resolution in most photothermal methods, including photoacoustic microscopy.

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“…451 HRG/Au hybrids catalyze the conversion of graphene into CNTs without applying additional hydrocarbons. 474 Here, graphene is assumed to enhanced the catalytic activity of the Au NPs, thereby facilitating the conversion of graphene into CNTs at 500 °C. It has been speculated that the Au NPs create small defects in the graphitic structure of the graphene layers, which initiate subsequently the formation of CNTs in the catalytic reaction.…”

Section: Conventional Catalysismentioning

confidence: 99%

Graphene based metal and metal oxide nanocomposites: synthesis, properties and their applications

et al. 2015

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Catalytic Conversion of Graphene into Carbon Nanotubes via Gold Nanoclusters at Low Temperatures

Cited by 24 publications

References 68 publications

Graphene Oxide-Promoted Reshaping and Coarsening of Gold Nanorods and Nanoparticles

Graphene Oxide-Promoted Reshaping and Coarsening of Gold Nanorods and Nanoparticles

Super‐Resolution Nonlinear Photothermal Microscopy

Graphene based metal and metal oxide nanocomposites: synthesis, properties and their applications

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