A novel method for fabrication of Fe catalyst used for the synthesis of carbon nanotubes

Abstract

Carbon nanotubes (CNTs) have been grown by decomposition of propane over a nanocamposite catalyst by chemical vapour deposition (CVD). The catalyst was prepared from an aluminum/iron oxide/graphite mixture milled in a high-energy ball-milling equipment. Scanning and transmission electron microscopies, Raman spectroscopy and X-ray diffraction measurements have been carried out in order to investigate the catalyst and synthesized CNTs. The results show that iron nanoparticles are produced in an alumina and ball-milled graphite matrix. This produced nanocomposite is used as a catalyst to synthesize CNTs via CVD successfully. The yield of CNTs formation was greatly influenced by the milling time and deposition temperature.

High Entropy Oxides—A Cost-Effective Catalyst for the Growth of High Yield Carbon Nanotubes and Their Energy Applications

“…There are many approaches, namely, infiltration, hydrothermal, coprecipitation, and vapor growth in which metal/metal oxide nanoparticles can be coupled with CNTs to form nanocomposites. , However, in the present work, we present a unique strategy of synthesizing HEO (Ni-, Fe-, Co-, Cr-, and Al-based) nanoparticles using a very simple and efficient sol–gel autocombustion technique and then using these as-synthesized HEO nanoparticles as the cost-effective catalyst for the growth of CNTs to form the HEO–CNT nanocomposite in two steps. CNTs were grown by chemical vapor deposition (CVD) technique in an inert atmosphere with exceptionally high yield as compared to the previous reports, , and further as-grown CNTs (HEO–CNT nanocomposite) without any purification were used as the potential electrode material for application in ECs. Herein, HEO nanoparticles demonstrate double role: (1) they act as a cost-effective catalyst for the growth of high yield CNTs and (2) they impart high strength and electrochemical redox activity to the HEO–CNT nanocomposite for energy applications.…”

Biosynthesis of iron nanoparticles using Ageratum conyzoides extracts, their antimicrobial and photocatalytic activity

“…Many biological systems such as plants [35], algae [16], diatoms [48], bacteria [29], yeast [26], fungi [43], and human cells [3] have been used to synthesize metal nanoparticles via the reductive capacities of the metabolites found in these organisms. For iron nanoparticles, several physical and chemical methods including mechanical milling [22], sodium borohydride reduction [8,59], solvothermal method [7], and carbothermal synthesis [51] have been employed for their preparation [32]. Iron nanoparticles synthesized by these methods rapidly agglomerate to form clusters due to interparticle Van der Waals and magnetic forces and may further undergo rapid oxidation in the presence of oxidants thereby limiting their reactivity [19,53].…”

Green synthesis, characterization of biomaterial-supported zero-valent iron nanoparticles for contaminated water treatment

“…Several physical and chemical production methods including mechanical milling (Karimi et al 2014), sodium borohydride (Satapanajaru et al 2008;Madhavi et al 2014), ethylene glycol (Raveendran et al 2003), solvothermal method (Basavaraju et al 2011), and carbothermal synthesis (Allabaksh et al 2010) have been employed for the preparation of ZVIN. But ZVIN, synthesized by above conventional methods, agglomerate rapidly in clusters due to Van der Waals and magnetic forces (Qiangu et al 2013).…”