Selective and Efficient Impregnation of Metal Nanoparticles on Cup-Stacked-Type Carbon Nanofibers

Abstract

We describe the efficient impregnation of Pt nanoparticles (OD < 3 nm) on cup-stacked-type carbon nanofibers. The method involves the dispersion of the fibers in H 2 PtCl 6 followed by low-temperature annealing. The Pt particle deposition is always homogeneous and can be controlled selectively on the outer or internal core using the hydrophobic nature of the material. Since the Pt particle activity on the fibers is high, this material could find applications as efficient catalysts and allied biological devices.

Transitional behaviour in the transformation from active end planes to stable loops caused by annealing

“…The characteristics of these edge sites, especially for the form of tubular-type carbon (carbon nanotubes) [4]- [13], make it possible to utilize them in the fabrication of absorbent materials [14], catalyst-supports [15,16], field emitters, gas storage components [17] and polymer composites [18,19]. It is well known that highly reactive edge sites are transformed into stable multi-loops when heat treated at higher temperatures [5,12,20,21].…”

Comparative study of herringbone and stacked-cup carbon nanofibers

“…It is generally accepted that carbon nanotubes consist of single or multiple graphene sheets rolled into concentric cylinders: thus giving rise to single wall carbon nanotubes (SWNTs) or multi-walled carbon nanotubes (MWNTs) [4,5]. Recently, we described a new type of carbon nanofiber, "stacked-cup carbon nanofiber", which exhibited a unique morphology of stacked, truncated conical graphene layers (cups) along the fiber length [6][7][8].Previously, three different geometries of carbon nanofibers (e.g., platelet, 1 …”

“…Even though both fibers have two important common aspects: (1) Aggregate (50-100µm) 6) Relatively loosely packed morphology Closely packed macro-morphology 7) Deposited carbon…”

Nano-Molar Level Hydrogen Peroxide Detection by Horseradish Peroxidase Adsorbed Cup-Stacked Carbon Nanotube Electrodes and Applications to l-Glutamate Detection

“…Previously, researchers reported that CNTs had been dispersed into water containing a variety of surfactants, 18 organic solvents attracted much attention as a superior functional nanosized material in semiconductors 21 and adsorbents. 22 CSCNTs consisted of many cup-shaped carbon units with a hollow open channel of 50 to 150 nm in diameter, 23 different from the structure of conventional multi-walled carbon nanotubes (MWCNTs) made up of some seamless cylinders as shown in Fig. 1.…”

“…Such a structure provides more hydrophilic edges thanks to the presence of functional groups containing oxygen (e.g., -COOH, -OH) than MWCNTs, which consisted largely of hydrophobic graphene sheets. 22 Thanks to these surface characteristics, CSCNTs can be readily suspended in polar solvents with the aid of ultrasonication. 21 Further, in our previous study, we revealed that CSCNTs could adsorb much more enzymes than MWCNTs and other carbon materials.…”