Carbon atoms in ethanol do not contribute equally to formation of single-walled carbon nanotubes.
نویسندگان
چکیده
We propose a unique experimental technique in which isotopically labeled ethanol, e.g., 12CH3-13CH2-OH, is used to trace the carbon atoms during the formation of single-walled carbon nanotubes (SWNTs) by chemical vapor deposition (CVD). The proportion of 13C is determined from Raman spectra of the obtained SWNTs, yielding the respective contribution of ethanol's two different carbon atoms to SWNT formation. Surprisingly, the carbon away from the hydroxyl group is preferably incorporated into the SWNT structure, and this preference is significantly affected by growth temperature, presence of secondary catalyst metal species such as Mo, and even by the substrate material. These experiments provide solid evidence confirming that the active carbon source is not limited to products of gas-phase decomposition such as ethylene and acetylene, but ethanol itself is arriving at and reacting with the metal catalyst particles. Furthermore, even the substrate or other catalytically inactive species directly influences the formation of SWNTs, possibly by changing the local environment around the catalyst or even the reaction pathway of SWNT formation. These unexpected effects, which are inaccessible by conventional techniques, paint a clearer picture regarding the decomposition and bond breaking process of the ethanol precursor during the entire CVD process and how this might influence the quality of the obtained SWNTs.
منابع مشابه
Radius Dependence of Hydrogen Storage Inside Single Walled Carbon Nanotubes in an Array
In this study, we have investigated radius dependence of hydrogen storage within armchair (n,n) single walled carbon nanotubes (SWCNT) in a square arrays. To this aim, we have employed equilibrium molecular dynamics (MD) simulation. Our simulations results reveal that radius of carbon nanotubes are an important and influent factor in hydrogen distribution inside carbon nanotubes and consequentl...
متن کاملMolecular Dynamics Investigation of The Elastic Constants and Moduli of Single Walled Carbon Nanotubes
Determination of the mechanical properties of carbon nanotubes is an essential step in their applications from macroscopic composites to nano-electro-mechanical systems. In this paper we report the results of a series of molecular dynamics simulations carried out to predict the elastic constants, i.e. the elements of the stiffness tensor, and the elastic moduli, namely the Young’s and shear mod...
متن کاملInvestigation of Solvent Effects on Interaction of Single-Strand DNA with Open-End of Single Walled Carbon Nanotubes Using QM and MM methods
The interaction of biomolecules with carbon nanotubes (CNTs) has generated a great deal ofinterest in the past few years. The interaction between B-form single-strand DNA (ssDNA) andsingle-walled carbon nanotubes (SWCNTs) is a subject of intense current interest; however thereare a relatively small number of papers in the literature dealing with interaction of DNA andSWCNTs. In this work we inv...
متن کاملInvestigation of hydralazine drug adsorption on functionalized single-walled carbon nanotubes by density functional theory (DFT) method
Background: In recent years, advances in nanotechnology presents opportunities to overcome limitations in targeted drug delivery. Nano drug carriers have the ability to change the pharmacokinetics of drugs and can improve efficacy and reduce side effects. The objective of the present work is to study the interaction of Hydralazine with functionalized carbon nanotubes by performing density funct...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید
ثبت ناماگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید
ورودعنوان ژورنال:
- ACS nano
دوره 7 4 شماره
صفحات -
تاریخ انتشار 2013