DNA-Wrapped Carbon Nanotubes: From Synthesis to Applications (original) (raw)
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Preprint, 2021
Carbon nanotubes (CNTs), composed of graphene/graphite sheets, have been used since the 1990s and become one of the most important materials owing to its massive applications in energy, environmental and life sciences. In general, there are two types of known CNTs such as single-walled CNTs (SWCNTs) and multi-walled CNTs (MWCNTs). They have broader and novel elds of application in the fabric and textile industries, wastewater treatment, energy storage, and also as structural reinforcement materials. CNTs are reported to synthesize by arc discharge, laser ablation and chemical vapor deposition (CVD) methods where CVD technique is found to be the most versatile and largely used method. In all the methods synthesized CNTs contain various degrees of impurities which are puri ed by oxidation treatment, ultra-sonication, magnetic puri cation, etc. CNTs have wide range of industrial applications due to their remarkable mechanical, thermal, electrical, chemical and biological properties. In this review, medical and biomedical applications of CNTs and CNTs-based composites are specially focused due to their signi cant applications in these elds along with their structure, classi cation, preparation and related properties. Besides, CNTs' toxicity and biosafety, especially on the human body, are also discussed in this review article.
2018
Carbon nanotubes (CNTs) are allotropes of carbon with a nanostructure that can have a length-to-diameter ratio greater than 1,000,000. These cylindrical carbon molecules have novel properties that make them potentially useful in many nanotechnology applications. Their unique surface area, stiffness, strength and resilience have led to much excitement in the field of pharmacy. Carbon nanotubes are categorized as single-walled carbon nanotubes (SWNTs) and multi-walled carbon nanotubes (MWNTs). Techniques have been developed to prepare nanotubes in sizeable quantities, such as: arc-discharge, laser-ablation, chemical vapor-deposition, silane-solution and flame-synthesis methods. The properties of CNTs are still being researched heavily and scientists have barely begun to tap the potential of these structures. They can pass through membranes, carrying therapeutic drugs, vaccines and nucleic acids deep into the cell to targets previously unreachable. Overall, recent studies regarding CNT...
Carbon Nanotubes: The Building Blocks of Nanotechnology Development
Carbon nanotubes' (CNTs) has become the building blocks of nano technology for energy system development, because of its astonished mechanical, energy storage and unique electronic properties. These ensure its relevancy for applications in enormous areas presently and in the future. Areas of applications include field emission devices, high-strength composition, sensors, nanobiomedicals, nanosystems, nano energy storage system and other related fields. This report reviewed CNTs' properties and how they are related to their physical and chemical structure. The design criteria for this material were critically reviewed which includes manufacture and cost savings. The growth of carbon nanotubes and manufacturing to its appropriate form such as purification, characterization and functionalization were comprehensively revised and reported. The current and future areas of applications of CNTs were identified; examples are nanoelectronics, scanning nanomicroscopy, biomedical sensors, nano energy storage system etc. This report is concluded with the progress made so far since CNTs were discovered and the potential challenges, potential solutions and it significant for meeting future energy needs among others.
Synthesis and purification of Carbon nanotubes
In this study, multi wall carbon nanotubes (MWCNTs) were synthesized by Chemical vapor deposition (CVD) method using two different catalysts (Fe nanoparticles) and (Ni nanoparticles) with two different substrates: Quartz and Alumina. Acetylene gas was used as a carbon source and Argon as a carrier gas at different temperatures and different times to study the effects of these parameters on CNTs yield. The produced MWCNTs were then purified by oxidation followed by chemical method involving treatment of MWCNTs with concentrated acids (H 2 SO 4 and HNO 3) to remove impurities. The MWCNTs were then functionalized by acidic treatment. The functionalized MWCNTs were then coated with Nickel using electroless plating method. Metal matrix composites (MMCs) were prepared by powder metallurgy method using Al/uncoated MWCNTs and Al/coated MWCNTs. The results show that the diameter range of prepared MWCNTs was (30-50) nm. The yield of CNTs using Ni nanoparticles as catalyst is higher than that of using Fe nanoparticles as catalyst. The coated CNTs have diameters ranging from 65-85 nm. The hardness of Al/coated CNTs composites is higher than that of Al/uncoated MWCNTs composites.