Low temperature one-step synthesis of cobalt nanowires encapsulated in carbon

Abstract

The one-step method of carbon nanotubes filled with continuous cobalt nanowires (CoF-CNT) synthesis is presented. Co/ZSM-5 (8 wt% Co) was used as catalyst for CoF-CNT production by methane decomposition at the temperature of 400°C and 800°C at atmospheric pressure in a conventional gas-flow system. The average diameter of the CoF-CNT is about 25 and 40 nm for products obtained at 400°C and at 800°C, respectively. The average size of coherently scattering domains along the normal to graphite layers L c , the interlayer spacing d 002 , the graphitization degree of carbon, and the relative intensities of the G and D bands in Raman spectroscopy were determined to characterize the quality of carbon. It was proved that cobalt-filled carbon nanotubes can be produced by a simple method. The results of XRD, FE-SEM, and TEM show that CoF-CNT can be obtained even at 400°C by catalytic decomposition of methane. On the basis of XRD, TEM, Raman spectroscopy was found that at a temperature of 800°C, a better quality of carbon was produced.

One-step synthesis of spontaneously graphitized nanocarbon using cobalt-nanoparticles

“…Thus, the similar catalytic ability in the low-temperature graphitization may be expected for Co NPs [19][20][21]. In addition, C film containing Co NPs (referred to a Co-C film hereafter) attracts the great interest for various applications such as magnetic data storage and magnetic resonance imaging [22]. In what follows, we will deal with the spontaneous graphitization at RT by simple one-step syntheses of Co-C films for the first time, leading to a strategy to achieve the ultra-low temperature graphene growth.…”

Effective utilization and characterization of carbon derived from non-biodegradable waste based electrical switches for supercapacitor applications: A green approach

“…The diffraction peak obtained at 2θ = 27.15° (002) corresponds to the carbon[JCPDS No. 08-0415]formed from the plastic waste [32]. In view of the fact that, during the manufacture of electrical switches from bakelite, various additives were added to obtain the required 220), (311) re ections of the face-centered cubic structure of metallic silver with the standard JCPDS card No.…”

Rapid Carbon Formation from Spontaneous Reaction of Ferrocene and Liquid Bromine at Ambient Conditions

“…These peaks were ascribed to hematite [14]. The XRD pattern of the ferrocene-derived carbon exhibited a broad reflection at d 002 = 3.4 Å (Figure 3, top), signaling the formation of amorphous carbon [12]. Raman spectroscopy gave the characteristic D (1378 cm −1 ) and G (1580 cm −1 ) bands with an intensity ratio of I D /I G~0 .8 (Figure 3, bottom), thus also signaling the formation of amorphous carbon [13].…”