Supramolecular Catalysts for the Gas-phase Synthesis of Single-walled Carbon Nanotubes

Abstract

Reversed micelles containing metallic ions have been used as precursors of novel catalysts for the gas-phase synthesis of single-walled carbon nanotubes (SWNTs). This technique possesses the following advantages: (i) excellent solubility in organic solvents, which are used as reactants and (ii) facile preparation of multicomponent catalysts enabling systematic screening of catalyst compositions for the synthesis of SWNTs. In this study, we report the results of the screening study on the catalytic behavior of Fe-Mo binary catalysts during the synthesis of SWNTs. The results suggested that the catalytic ability was closely related to the strain of the crystal structure of Fe-Mo catalysts formed in the reaction and/or the phase transition caused by dissolution of the Mo atoms. The addition of lithium to the Fe-Mo binary catalysts has revealed an increase in the yield of SWNTs.

High yield synthesis and characterization of the structural and magnetic properties of crystalline ErCl3 nanowires in single-walled carbon nanotube templates

“…SWCNTs were synthesized by the so-called extended direct injection pyrolytic synthesis (e-DIPS) [19], and the raw products were annealed at 1200 ˚C for 24 hours in order to remove any remaining Fe catalyst nanoparticles and amorphous carbon impurities. Figure 1 shows the thermal gravimetric analysis (TGA) trace of the purified SWCNTs.…”

“…The method can be more generally applied to fabricate various low-dimensional metal complex nanowires and characterize their structural and magnetic properties. This will open up new fi elds in the science and technology of carbon nanotubes and related low-dimensional nanomaterials.SWCNTs were synthesized by the so-called extended direct injection pyrolytic synthesis (e-DIPS) [19], and the raw products were annealed at 1200 ˚C for 24 hours in order to remove any remaining Fe catalyst nanoparticles and amorphous carbon impurities. Figure 1 shows the thermal gravimetric analysis (TGA) trace of the purified SWCNTs.…”

Flame Synthesis of Carbon Nanotube through a Diesel Engine Using Normal Dodecane/Ethanol Mixing Fuel as a Feedstock

“…Sulfur is known to enhance the growth of carbon nanomaterials presumably due to a reduction of melting temperature (Tibbetts et al, 1994) and/or low surface free energy (Wei et al, 2007;Zhang et al, 2014). Several studies indicate that the influence of molybdenum addition is stabilization of nanoparticles and carbon supplier (Alvarez et al, 2001;Saito et al, 2006). In practice, we could successfully form CNT in the presence of sulfur and molybdenum (Suzuki and Mori, 2017).…”

Techniques of aligning carbon nanotubes

“…Co/Mo catalyst-assisted chemical vapor deposition (CoMoCAT) [24], other varieties of chemical vapor deposition (CVD) [25][26][27], arc discharge [28,32], laser ablation (LA, also known as pulsed laser vaporization PLV) [30,32], flame synthesis [1], and direct injection pyrolytic synthesis (DIPS) [29,31,32].…”