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Experimental Investigation of Nanosecond Laser Ablation of Carbon Nanotubes.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Experimental Investigation of Nanosecond Laser Ablation of Carbon Nanotubes./
作者:	Pachon, Oscar Fabian.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2021,
面頁冊數:	63 p.
附註:	Source: Masters Abstracts International, Volume: 83-06.
Contained By:	Masters Abstracts International83-06.
標題:	Materials science. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=28861807
ISBN:	9798759942948

Experimental Investigation of Nanosecond Laser Ablation of Carbon Nanotubes.
Pachon, Oscar Fabian.

Experimental Investigation of Nanosecond Laser Ablation of Carbon Nanotubes. - Ann Arbor : ProQuest Dissertations & Theses, 2021 - 63 p.

Source: Masters Abstracts International, Volume: 83-06.

Thesis (M.S.)--Saint Louis University, 2021.

This item must not be sold to any third party vendors.

Carbon is one of the most abundant elements present in the materials science field, whether applied to micro or micro-size industries. Its ability to combine with a wide variety of components has produced numerous compounds such as graphene, diamond, and graphite with a wide range of applications. Recent studies have led to the discovery of Carbon Nanostructures in this allotrope of carbons that have attracted huge interest in the scholarly world to expand their applications in areas such as electricity and medicine due to their unique physical and mechanical properties. The synthesis of these nanostructures has remained very complex, especially in cases where purity is a priority. Carbon monotubes (CNTS) are synthetic allotropes of carbon having a nanostructure and a diameter measured in nanometers. CNTs possess superior physical and chemical properties such as high electrical and thermal conductivity and high mechanical and elastic properties, making them a subject of much investigation and development in the last two decades. This paper aims to investigate the manufacturability of CNTs by growing them in the lab and their relevant properties changes using the laser ablation process. The Chemical Vapor Deposition (CVD) process was used to grow CNTs where the catalyst used for growth was Iron on a Silicon Substrate’s uses substrate samples of 5mm by 5mm averagely, Continuum Surelite Class III laser with 1064 nm wavelength of a single pulse mode is used to ablate the CNTs to assess property changes in CNTs resulting from laser-matter interactions.To investigate the influences on properties changes of CNTs, varied laser beam energy and beam diameter are used. The range of laser beam energy ranges from 0.063 J to 0.35 J while that of the beam diameter is adjusted using the optical lens, for which focal length is 150 mm. Scanning Electron Microscope ( SEM), which scans a focused electron beam over a surface to create an image, together with Raman Spectroscopy, was used to characterize the samples before and after laser ablation. Raman Spectrum was taken four to six times to demonstrate the population of both SWCNTs and MWCNTs before ablation for each of the 12 samples. The analysis revealed that when 0.153 J is used as the distance between the sample and lens is equal to the focal length of the lens, SEM imaging and Raman Spectrum revealed a burned circumference caused by a laser beam. The CNTs at a distance of 200 micrometers around are found to be broken down as well due to the heat propagation from the laser beam. The application of laser can reduce the electrical conductivity from a CNT network without damaging silicon substrate, which could expand the application of CNTs in the Electronics industry. These molecules were primarily seen in a spherical shape. However, until 1991, Iijima [1] of NEC observed a tubular shape in coaxial tubes of graphitic sheets, ranging from two shells to approximately 50.Characterization of CNTs is mainly carried out through a high-resolution electron microscope to distinguish between SCWNTs and MCTs and provide other important information. However, advancement in science has provided other avenues of characterizing of CNTs. Due to the low-resolution limitation present in a conventional microscope, scientists have developed ways of analyzing CNTs that will not destroy the sample. This paper focused on Raman Spectroscopy as the method of characterizing Raman Spectroscopy, Atomic Force Microscopy, X-ray photoemission spectroscopy of CNTs. At the sub-nanometre level, carbon nanostructures are classified using methods such as Transmission Electron Microscopy (TES), Atomic Forces Microscopy (AFM), and Scanning Electron Microscope (SME). SME was used in this research and discussed in detail due to its traceable standard magnification property.

ISBN: 9798759942948Subjects--Topical Terms:

557839
Materials science.
Subjects--Index Terms:

Carbon

Experimental Investigation of Nanosecond Laser Ablation of Carbon Nanotubes.
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500 $a Source: Masters Abstracts International, Volume: 83-06.
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506 $a This item must not be sold to any third party vendors.
520 $a Carbon is one of the most abundant elements present in the materials science field, whether applied to micro or micro-size industries. Its ability to combine with a wide variety of components has produced numerous compounds such as graphene, diamond, and graphite with a wide range of applications. Recent studies have led to the discovery of Carbon Nanostructures in this allotrope of carbons that have attracted huge interest in the scholarly world to expand their applications in areas such as electricity and medicine due to their unique physical and mechanical properties. The synthesis of these nanostructures has remained very complex, especially in cases where purity is a priority. Carbon monotubes (CNTS) are synthetic allotropes of carbon having a nanostructure and a diameter measured in nanometers. CNTs possess superior physical and chemical properties such as high electrical and thermal conductivity and high mechanical and elastic properties, making them a subject of much investigation and development in the last two decades. This paper aims to investigate the manufacturability of CNTs by growing them in the lab and their relevant properties changes using the laser ablation process. The Chemical Vapor Deposition (CVD) process was used to grow CNTs where the catalyst used for growth was Iron on a Silicon Substrate’s uses substrate samples of 5mm by 5mm averagely, Continuum Surelite Class III laser with 1064 nm wavelength of a single pulse mode is used to ablate the CNTs to assess property changes in CNTs resulting from laser-matter interactions.To investigate the influences on properties changes of CNTs, varied laser beam energy and beam diameter are used. The range of laser beam energy ranges from 0.063 J to 0.35 J while that of the beam diameter is adjusted using the optical lens, for which focal length is 150 mm. Scanning Electron Microscope ( SEM), which scans a focused electron beam over a surface to create an image, together with Raman Spectroscopy, was used to characterize the samples before and after laser ablation. Raman Spectrum was taken four to six times to demonstrate the population of both SWCNTs and MWCNTs before ablation for each of the 12 samples. The analysis revealed that when 0.153 J is used as the distance between the sample and lens is equal to the focal length of the lens, SEM imaging and Raman Spectrum revealed a burned circumference caused by a laser beam. The CNTs at a distance of 200 micrometers around are found to be broken down as well due to the heat propagation from the laser beam. The application of laser can reduce the electrical conductivity from a CNT network without damaging silicon substrate, which could expand the application of CNTs in the Electronics industry. These molecules were primarily seen in a spherical shape. However, until 1991, Iijima [1] of NEC observed a tubular shape in coaxial tubes of graphitic sheets, ranging from two shells to approximately 50.Characterization of CNTs is mainly carried out through a high-resolution electron microscope to distinguish between SCWNTs and MCTs and provide other important information. However, advancement in science has provided other avenues of characterizing of CNTs. Due to the low-resolution limitation present in a conventional microscope, scientists have developed ways of analyzing CNTs that will not destroy the sample. This paper focused on Raman Spectroscopy as the method of characterizing Raman Spectroscopy, Atomic Force Microscopy, X-ray photoemission spectroscopy of CNTs. At the sub-nanometre level, carbon nanostructures are classified using methods such as Transmission Electron Microscopy (TES), Atomic Forces Microscopy (AFM), and Scanning Electron Microscope (SME). SME was used in this research and discussed in detail due to its traceable standard magnification property.
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