Synthesis of carbon nanotubes using green plant extract as catalyst: unconventional concept and its realization

Abstract

Green catalyst derived from plants, a cheap and abundant natural source, is used for the synthesis of multiwalled carbon nanotubes (MWNTs). The concept is unconventional and practically realized into existence by simple CVD growth while keeping away the potential hazards caused by metal catalyst on environment and living organisms. The notable points to mention of such growth are: (1) grown CNTs are free from toxic metal catalyst, (2) low growth temperature (575°C) required and produced high yield vis-à-vis any other catalyst used so far reported, and (3) no need of expensive and complex systems for its synthesis. Besides, growth of SWNT as well as carbon nano-belts with hollow rectangular cross-section is observed when growth temperature increased to 800°C, specifically, for the wall-nut extract. The samples were characterized by microscopic and spectroscopic analysis and the results verified our study. The present work provides innovative technique and may open up new avenues for CNTs synthesis and its applications.

Antimicrobial activity of functionalized single‐walled carbon nanotube with herbal extract of Hempedu bumi

“…The andrographolide group was found to be the major component of H bumi , while another peak at 714.3 cm −1 reflected the alkane group and peaks at 1639.24 cm −1 and 2135.1 cm −1 likely belonged to the alkene group . In the past, carbon nanotube‐assisted herbal extracts towards the biologically important applications have been demonstrated . The present study has been added as additional evidence, by showing the potential SWNT‐mediated antimicrobial activity.…”

Greener synthesis of chemical compounds and materials

“…There are several reports on the growth of carbon nanotubes (CNTs) using plant extracts as catalysts; however, high temperatures are requiring for their formation. Thus, CNTs were grown using rose ( Rosa ), garden grass ( Cynodon dactylon ), walnut ( Juglans regia ) and neem ( Azadirachta indica ) plant extracts in methanol, loaded in a Si sample, as catalysts by chemical vapour deposition (CVD) of acetylene gas at 575°C; meanwhile, carbon nanobelts and SWCNTs were obtained at 800°C (not in cases of all extracts) [146]. The products did not contain toxic metals; this is a great advantage of this greener method.…”

Prospective of biosynthesized L.satiVum oil/PEG/Ag-MgO bionanocomposite film for its antibacterial and anticancer potential

“…AgNPs has expressed fascinating biological properties and at very low dose it is lethal to pathogens, but safe to human beings ( Reddy et al, 2015 ). Several approaches have been applied to prepare metal/metal oxide nonanocomposites with different morphologies such as bimetallic alloys ( Navya et al, 2019 ), core-shells ( Chiozzi and Rossi, 2020 ), nanosheets ( Pazmiño-Durán et al, 2001 ), nano-rattle ( Wu et al, 2011 ), nanotubes ( Tripathi et al, 2017 ) and yolk-shell ( Moon, 2020 ) etc. The fabrication of these nanostructures involves various physiochemical procedures that have been generated hazardous byproducts, rigorous energy and harsh environmental conditions.…”