Formation and mechanism of ultrahigh density platinum nanoparticles on vertically grown graphene sheets by metal-organic chemical supercritical fluid deposition

Mase, K.; Kondo, Hiroki; Kondo, Shingo; Hori, Masaru; Hiramatsu, Mineo; Kano, Hiroyuki

doi:10.1063/1.3583672

Cited by 25 publications

(30 citation statements)

References 25 publications

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“…These graphene edges and domain boundaries are chemically reactive and are modified easily with several types of surface termination, e.g., C-NH 2 , C-OH, and C-COOH. Furthermore, Pt nanoparticles were preferably deposited on the defects such as grain boundaries on the surface of graphite [24]. Therefore, the structure of CNWs can be suitable for the platform of the electrochemical and biosensing applications.…”

Section: Graphene -New Trends and Developmentsmentioning

confidence: 99%

“…On the other hand, the H 2 O 2 treatment induces the characteristic changes in their morphology with keeping the size of CNWs constant. The nanometer-scale asperities on the CNW surface increase the surface area, which would be useful as a platform for supporting metal nanoparticles and organopollutant degradation devices [24,41]. It is noted that such asperities could be reduced by O radical exposure after H 2 O 2 treatment, resulting in the reduction of the thickness of CNW sheets.…”

Section: Etching Of Carbon Nanowallsmentioning

confidence: 99%

“…As was illustrated in Figure 1, CNW film has many graphene edges on the top, and the CNW sheet itself is composed of nanodomains of a few tens of nanometers in size [46]. Pt nanoparticles were preferably deposited on the defects such as grain boundaries on the surface of graphite [24]. Therefore, the structure of CNWs can be suitable for the platform of the electrochemical and biosensing applications.…”

Section: Platform For Biosensingmentioning

confidence: 99%

“…Figure 1 shows a schematic illustration of CNWs, where few-layer graphenes composed of nanographite domains form a self-supported network of wall structures. The mazelike architecture of CNWs with large-surface-area graphene planes and a high density of graphene edges would be useful as platform for electrochemical applications as well as tissue engineering such as scaffold for cell culturing [18][19][20][21][22][23][24][25]. CNWs and related sheet nanostructures have been synthesized using several PECVD techniques, which are similar to those utilized for growing carbon nanotubes (CNTs) and diamond thin films.…”

Section: Introductionmentioning

confidence: 99%

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Nanoplatform Based on Vertical Nanographene

Hiramatsu¹,

Kondo²,

Hori³

2015

Graphene - New Trends and Developments

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Self-organized graphite sheet nanostructures composed of graphene have been studied intensively. Carbon nanowalls and related sheet nanostructures are layered graphenes with open boundaries. The sheets form a self-supported network of wall structures with thicknesses in the range from a few nanometers to a few tens of nanometers, and with a high aspect ratio. The large surface area and sharp edges of carbon nanowalls could prove useful for a number of different applications. Fabrication techniques of carbon nanowalls and possible applications using carbon nanowalls as nanoplatform in the area of electrochemistry and tissue engineering have been described. Radical injection technique was successfully applied to fabricate straight and large-size monolithic carbon nanosheet. The structure of carbon nanowalls was controlled by changing the total pressure and input power. In addition, the structure of carbon nanowalls was modified by O 2 plasma etching and H 2 O 2 treatment. Using carbon nanowalls as platform would be the most promising and important application. Carbon nanowalls were used as electrode to detect several biomolecules. In addition, carbon nanowalls were oxidized by the surface treatment using atmospheric pressure plasma, and proteins such as bovine serum albumin were immobilized on these surface. Moreover, carbon nanowalls were used as scaffold for cell culturing. The dependence of the cell culturing rates and morphological changes of HeLa cells on carbon nanowall scaffolds with different densities and wettability were systematically investigated. Nanoplatform based on vertical nanographene offers great promise for providing a new class of nanostructured electrodes for electrochemical sensing, biosensing and energy conversion applications.

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Section: Graphene -New Trends and Developmentsmentioning

confidence: 99%

Section: Etching Of Carbon Nanowallsmentioning

confidence: 99%

Section: Platform For Biosensingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Nanoplatform Based on Vertical Nanographene

Hiramatsu¹,

Kondo²,

Hori³

2015

Graphene - New Trends and Developments

Self Cite

View full text Add to dashboard Cite

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“…The synthesis of platinum nanoparticles/carbon nanocomposites using supercritical fluids, usually scCO 2 fluid, has been reported as an alternative technique 15–19, where the formation of nanoparticles down to several nanometers in diameter was the main concern. In order to obtain such a small particle size with a narrow dispersion reproducibly, it is important to understand the dependences of the particle size on deposition conditions in detail.…”

Section: Introductionmentioning

confidence: 99%

Effects of surface modification of carbon nanotube on platinum nanoparticle deposition using supercritical carbon dioxide fluid

Watanabe

Akimoto

Kondoh

2012

Physica Status Solidi (a)

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Platinum nanoparticles were fabricated on multiwalled carbon nanotubes (MWCNTs) by using supercritical fluid deposition. In this technique, deposition was carried out in a supercritical carbon dioxide fluid via hydrogen reduction of a dissolved platinum complex. The deposition temperature and deposition‐time dependences on the particle size and density were investigated. The obtained metallic nanoparticles/MWCNT nanocomposites were characterized by using transmission electron microscopy and scanning transmission electron microscopy. Crystalline pure platinum nanoparticles were clearly observed on the surfaces of MWCNTs. Most of the particles observed were smaller than 5 nm in diameter. The density of the particles increased with temperature between 393 and 423 K and decreased above 423 K. The nucleation of the nanoparticles took place within a deposition time of 60 min, and then agglomeration and coarsening occurred, resulting in an increase of the particle size. It was found that the surface topography of the carbon support greatly influences the platinum nucleation density. Indeed, when the MWCNTs were treated with hydrogen plasma prior to platinum deposition, the density of the nanoparticles markedly increased. The impact of the hydrogen plasma treatment on the particle‐size dependences was also investigated.

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Prospects of Supercritical Fluids in Realizing Graphene‐Based Functional Materials

2016

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Supercritical-fluids science and technology predate all the approaches that are currently established for graphene production by several decades in advanced materials design. However, it has only recently been proposed as a plausible approach for graphene processing. Since then, supercritical fluids have emerged into contention as an alternative to existing technologies because of their scalability and versatility in processing graphene materials, which include composites, aerogels, and foams. Here, an overview is presented of such materials prepared through supercritical fluids from an advanced materials science standpoint, with a discussion on their fundamental properties and technological applications. The benefits of supercritical-fluid processing over conventional liquid-phase processing are presented. The benefits include not only better performances for advanced applications but also environmental issues associated with the synthesis process. Nevertheless, the limitations of supercritical-fluid processing are also stressed, along with challenges that are still faced toward the achievement of the great expectations from graphene materials.

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Formation and mechanism of ultrahigh density platinum nanoparticles on vertically grown graphene sheets by metal-organic chemical supercritical fluid deposition

Cited by 25 publications

References 25 publications

Nanoplatform Based on Vertical Nanographene

Nanoplatform Based on Vertical Nanographene

Effects of surface modification of carbon nanotube on platinum nanoparticle deposition using supercritical carbon dioxide fluid

Prospects of Supercritical Fluids in Realizing Graphene‐Based Functional Materials

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