Study Of Gas Adsorption On As Produced And Modified Carbon Nanotubes
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Study Of Gas Adsorption On As Produced And Modified Carbon Nanotubes
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Author : Dinesh Singh Rawat
language : en
Publisher:
Release Date : 2010
Study Of Gas Adsorption On As Produced And Modified Carbon Nanotubes written by Dinesh Singh Rawat and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with categories.
Volumetric adsorption isotherm measurements were used to study the adsorption characteristics of ethane and butane on as-produced single-walled carbon nanotubes. Two adsorption substeps were obtained for each alkane molecule. However, the size of the high pressure substep was found to be gradually smearing with the increase in size of the adsorbed molecule. This phenomenon is interpreted as size entropy effect for linear molecules. Kinetics measurements of alkane adsorption on SWNTs were also conducted and their dependence on the molecular length was determined. Similar adsorption measurements were performed for Argon (Ar) on as-produced single-walled carbon nanotubes and nanotubes that were structurally modified using acid treatment. Enhancement of the sorptive capacity and the presence of two distinct kinetics of gas adsorption verified partial opening of single walled carbon nanotubes as a result of chemical treatment. Multiwalled carbon nanotubes were exposed to oxygen plasma treatment for varying time periods. Afterwards, adsorption measurements of Methane (CH 4) were conducted on untreated and oxygen plasma treated tubes. The presence of an additional substep, after exposing multiwalled carbon nanotubes to oxygen plasma for varying time periods, suggested progressive cleaning of nanotube surface.
Gas Adsorption On Suspended Carbon Nanotubes And Graphene
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Author : Boris Dzyubenko
language : en
Publisher:
Release Date : 2017
Gas Adsorption On Suspended Carbon Nanotubes And Graphene written by Boris Dzyubenko and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017 with categories.
Rare gas adsorption was studied on suspended individual single walled carbon nanotubes and graphene. The devices were fabricated as field effect transistors. Adsorption on graphene was studied through two-terminal conductance. On nanotube devices adsorption was studied through conductance while the coverage (density) of the adsorbates was determined from the mechanical resonance frequency shifts. The adsorbed atoms modified the conductance of the nanotube field effect transistors, in part through charge transfer from the adsorbates to the nanotube. By tracking the shifts of conductance as a function of gate voltage, G=G(Vg), and comparing these shifts with the periodicity of the Coulomb blockade oscillations we quantified the charge transfer to the nanotubes with high accuracy. For all studied gases (He, Ar, Kr, Xe, N2, CO, and O2) the charge transfer had a similar magnitude and was rather small, on the order of 10^-5 to 10^-3 electrons per adsorbed atom. The nanotube devices displayed two classes of adsorption behavior. On some devices the monolayers exhibited first-order phase transitions analogous to those that occur in adsorbed monolayers on graphite. On other devices phase transitions within the adsorbed monolayers were absent. We present evidence that a highly uniform layer of contaminants deposits on the surface of suspended nanotube devices either upon cooldown in the cryostat or at room temperature from air. These contaminants modify the adsorption behavior preventing the adsorbed monolayers from exhibiting the first order phase transitions expected to occur on a clean surface. A similar type of contamination leading to virtually identical effects occurs on suspended graphene. In the low coverage regions of isotherms on nanotubes we observe Henry's law behavior, demonstrating a high uniformity of the surface and allowing us to accurately determine the single particle binding energy to this surface. The determined binding energies were 776+-10 K for Ar, and 997+-37 K for Kr. In the second part of the dissertation we present the first measurements of adsorption on a pristine graphene surface, exposed through aggressive electric current annealing. On graphene the rare gas adsorbates form monolayers with phases analogous to those on graphite, but with phase transitions occurring at slightly higher pressures due to a reduction of binding energy. The condensations of monolayers with phases not commensurate with the graphene lattice resulted in a slight shift of the charge neutrality point of monolayer graphene corresponding to a change of carrier concentration on the order of 10^9 e/cm^2. Adsorption of N2 and CO, which formed a Root 3 X Root 3 commensurate solid monolayer, produced a dramatic reduction of the two-terminal conductance of graphene by as much as a factor of three. This effect is possibly connected with the opening of a band gap expected to occur in such structures. We observe hysteretic behavior in the adsorbed Root 3 X Root 3 commensurate monolayers on freestanding graphene, which is likely due to the interaction of two adsorbed monolayers on opposite surfaces of the graphene sheet.
Gas Adsorption On Suspended Carbon Nanotubes And Graphene
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Author : Boris Dzyubenko
language : en
Publisher: Boris Dzyubenko
Release Date : 2017-08-18
Gas Adsorption On Suspended Carbon Nanotubes And Graphene written by Boris Dzyubenko and has been published by Boris Dzyubenko this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017-08-18 with Science categories.
Rare gas adsorption was studied on suspended individual single walled carbon nanotubes and graphene. The devices were fabricated as field effect transistors. Adsorption of N2 and CO, which formed a Root 3 X Root 3 commensurate solid monolayer, produced a dramatic reduction of the two-terminal conductance of graphene by as much as a factor of three. This effect is possibly connected with the opening of a band gap expected to occur in such structures.
Carbon Nanomaterials For Gas Adsorption
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Author : Maria Letizia Terranova
language : en
Publisher: CRC Press
Release Date : 2012-11-27
Carbon Nanomaterials For Gas Adsorption written by Maria Letizia Terranova and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-11-27 with Technology & Engineering categories.
Research in adsorption of gases by carbon nanomaterials has experienced considerable growth in recent years, with increasing interest for practical applications. Many research groups are now producing or using such materials for gas adsorption, storage, purification, and sensing. This book provides a selected overview of some of the most interesting scientific results regarding the outstanding properties of carbon nanomaterials for gas adsorption and of interest both for basic research and technological applications. Topics receiving special attention in this book include storage of H, purification of H, storage of rare gases, adsorption of organic vapors, gas trapping and separation, and metrology of gas adsorption.
Adsorption Studies Of Simple Gases On As Produced Single Walled Carbon Nanotubes
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Author : Saikat Talapatra
language : en
Publisher:
Release Date : 2002
Adsorption Studies Of Simple Gases On As Produced Single Walled Carbon Nanotubes written by Saikat Talapatra and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002 with categories.
Syntheses And Applications Of Carbon Nanotubes And Their Composites
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Author : Satoru Suzuki
language : en
Publisher: BoD – Books on Demand
Release Date : 2013-05-09
Syntheses And Applications Of Carbon Nanotubes And Their Composites written by Satoru Suzuki and has been published by BoD – Books on Demand this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-05-09 with Science categories.
Carbon nanotubes are rolled up graphene sheets with a quasi-one-dimensional structure of nanometer-scale diameter. In these last twenty years, carbon nanotubes have attracted much attention from physicists, chemists, material scientists, and electronic device engineers, because of their excellent structural, electronic, optical, chemical and mechanical properties. More recently, demand for innovative industrial applications of carbon nanotubes is increasing. This book covers recent research topics regarding syntheses techniques of carbon nanotubes and nanotube-based composites, and their applications. The chapters in this book will be helpful to many students, engineers and researchers working in the field of carbon nanotubes.
Carbon Nanotubes For Energy And Environmental Applications
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Author : Soney C. George
language : en
Publisher: CRC Press
Release Date : 2022-10-27
Carbon Nanotubes For Energy And Environmental Applications written by Soney C. George and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022-10-27 with Science categories.
This new book, Carbon Nanotubes for Energy and Environmental Applications, covers the timely issue of green applications of carbon nanotubes. It covers the diverse usages of carbon nanotubes for the sensing of environmentally hazardous chemicals, for water purification, for the protection of the environment, and for new energy applications. The development of highly sensitive CNT-based gas sensors for air pollution monitoring, for green synthesis of carbon nanotubes, and for green energy applications are discussed in this volume. The diverse topics in the volume include nanodiamonds for energy storage, new lubricant additives that enhance energy efficiency, how carbon nanotubes can be applied in the food and agricultural sectors, the use of CNTs in water purification and desalination, carbon nanotubes-based electrochemical sensors for environmentally hazardous chemicals, and much more. This timely book addresses a need of the hour and will provide valuable for environmentally conscious industry professionals, faculty and students, and researchers in materials science, engineering, physics, and chemistry with interest in nanomaterials.
Purification And Gas Adsorption Studies Of Single Walled Carbon Nanotubes
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Author : Katherine E. H. Gilbert
language : en
Publisher:
Release Date : 2005
Purification And Gas Adsorption Studies Of Single Walled Carbon Nanotubes written by Katherine E. H. Gilbert and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with Carbon categories.
Theory Of Gas Adsorption In Carbon Nanostructures
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Author :
language : en
Publisher:
Release Date : 2003
Theory Of Gas Adsorption In Carbon Nanostructures written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with categories.
This report is a brief summary of the results of studies conducted by faculty, students, and postdoctoral fellows at Pennsylvania State University (Department of Physics) and the University of Pittsburgh (Department of Chemical and Petroleum Engineering) on gas adsorption in carbon nanostructures. The principal research methods employed in these studies were analytical or numerical theory and computer simulation. In addition, successful collaborations with experimental scientists at these institutions and elsewhere took place. The research focused on the prediction of the thermodynamic properties of gases adsorbed on nanotubes. Studies also were conducted on the spectroscopic properties and momentum distribution of hydrogen. In most cases, experimental data on gas adsorption were consistent with the predictions. In some cases, especially in the case of hydrogen, the data were particularly dependent on material preparation and the kind of experimental study of adsorption that was performed. The authors have developed sophisticated models that improve upon conventional assumptions about carbon nanotubes' electronic properties and their effects on adsorption. They also have investigated the consequences of polydisperse tube size distribution and dilation of the tube lattice in a nanotube bundle on adsorption. The report contains bibliographic references to the 27 research publications that were completed by this group of investigators during the course of this contract with the Army Research Office.
Gas Adsorption Studies On Vertically Aligned Carbon Nanotubes
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Author : Deepu Joseph Babu
language : en
Publisher:
Release Date : 2016
Gas Adsorption Studies On Vertically Aligned Carbon Nanotubes written by Deepu Joseph Babu and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with categories.