Characterization Of Carbon Nanotubes Using Raman Excitation Profiles
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Sulfur‑modified cobalt catalysts for the chirality‑selective
catalyst has a good selectivity to (9,8) nanotubes, the carbon yield without decreasing compared to original Co/SiO 2 catalyst. The characterization results of the atalysts c show that the formation of Co 9 S 8 nanoparticles during sulfidation plays a critical role in modulating the chirality selectivity of the catalyst.
Raman excitation profiles of metallic single-walled carbon
May 30, 2019 Plasmons in isolated single-walled carbon nanotubes Ricardo Perez and William Que-Characterizing carbon nanotube samples with resonance Raman scattering A Jorio, M A Pimenta, A G Souza Filho et al.-Recent citations Influence of electron-phonon coupling on the low-temperature phases of metallic single-wall carbon nanotubes Junichi Okamoto et al-
NANO EXPRESS Open Access Junction investigation of graphene
Raman spectroscopy is a nondestructive optical technique, has been successfully used to characterize graphene and other carbon-based materials [12,13]. Furthermore, it was shown that the Raman spectrum of graphene provides useful informa-tion about its crystallinity and the number of layers present within the sample . The typical Raman spec-
Excitonic and Vibrational Properties of Single-Walled
size, shape, and topology. Carbon nanotubes are one of the brightest examples of such materials. Single-walled carbon nanotubes (SWCNTs) can be considered as quasi-one-dimen-sional derivatives of bulk graphite; whereby one-atom-thick layers are rolled into long rigid cylinders a few nanometers in diameter.
ABNORMAL ANTI-STOKES RAMAN SPECTRA OF SINGLE WALLED CARBON
to the RBM , very sensitive to the excitation wavelength, play a crucial role in the characterization of SWNTs. In particular, by using the equation Ω (cm-1) = 223.75/d (nm), the peak position (Ω cm-1) of RBM, provides an efficient method to determine the diameters of the tubes [1,2]. The Raman signature of bundled
Selective Interaction of a Water Soluble Naphthalenediimide
ent wavenumbers, speciﬁcally 220 cm 1 (633 nm excitation, Fig-ure 3b Figure S11), 185 cm 1 (532 nm excitation, Figure S7 S8) and 258 cm 1 (785 nm excitation, Figure S12-S13), at which the ef-fect of change in intensity due to debundling is low. In the case of [email protected], the Raman spectra generally shows an increase in
Growth of diameter-modulated single-walled carbon nanotubes
The diameter of individual single-walled carbon nanotubes (SWNTs) was successfully modulated along their axes by instant temperature control in a laser-assisted chemical vapor deposition (LCVD) process. SWNTs were grown using different temperature profiles to investigate the effects of temperature variation on their growth.
FluoroMax-4 Series - Horiba
measurements using a microscope. With the industry s most extensive list of accessories, the FluoroMax series offers unparalleled flexibility to meet all of your lab s experimental needs. The FluoroMax Series, from the most trusted name in fluorescence, offers unmatched sensitivity and unparalleled flexibility for all. your lab's
Raman Spectroscopy - Philips
Mar 02, 2019 studies using Raman spectroscopy is the characterization of carbon phases. The technique is able to distinguish the different (semi-)crystalline forms of carbon such as diamond, graphite and carbon nanotubes (fig. 4). For example, the effect of wear on a diamond-like carbon layer (DLC) as used in computer hard disks
n m) Structural Assignments and Chirality Dependence in
Single-wall carbon nanotubes (SWNTs) have been the focus of intense research1,2 since their discovery in 1991.3,4 Raman scattering has been proven to be valuable as a remote, contactless method of sample characterization and as a method for studying the one-dimensional (1D) electronic and vibrational properties
advent of fullerenes (0D), followed in chronological order by carbon nanotubes (1D), carbon nanohorns, and, most recently, by graphene (2D). These species are now poised for use in catalysis. Expanding global needs for energy have led to a significant effort to develop alternatives to fossil fuels.
In-Situ Raman Scattering Studies of Alkali-Doped Single Wall
Electrochemical doping and in -situ Raman scattering were used to study charge transfer in K - and Li -doped single wall carbon nanotubes (SWNT) as a function of alkali concentration. An 8 cm-1 downshift was observed for the tangential phonon mode of SWNT doped to stoichiometries of KC 24 and Li 1.25 C6. The shift in both systems is
Efficient Spectrofluorimetric Analysis of Single-Walled
Excitation Profiles. Each excitation factor σ rel (ν exc i) n,m is the absorption cross section of an (n,m) species at the frequency of the ith excitation laser, relative to its E 22 peak value. This equals the relative emission intensity for off-resonance versus resonant excitation of that species, assuming that the fluorescence quan-
Low Temperature Growth of SWNTs on a Nickel Catalyst by
2.2.6 Raman characterization All Raman measurements were performed on as- produced carbon nanotubes using a HORIBA Jobin Yvon LabRAM 300 spectrometer with an excitation wavelength of 633 nm (He Ne) or 514 nm (Ar ion) lasers. Laser power was kept below 0.02 mW (50× objective, ~2 µm spot size) for all Raman measure-
Electronic Supplementary Information via short
of the SWCNT-COOH was recorded using a T64000 triple Raman spectrometer (Horiba Jobin Yvon, Italy) at room temperature, the Ar +-laser (514.5 nm) was used, and the power of laser beam was 2-3 mW. D (1230 cm −1) and G (1500−1550 cm −1) bands and the radial breathing mode bands (155 and 170 cm −1) are observed in the Raman spectrum of
4.0 Production and Characterization of Carbon Nanoballs and
Figure 4.4 reveals the Raman spectroscopy of CNPs produced. The sample excitation was performed using 6mW of 514.5 nm light with a 1µm spot size. The integration time for the spectra collection was 2 minutes per acquisition. It is observed from Figure 4.4 that the G peak splitting profiles and D-peak splitting
Diameter-controlled growth of aligned single-walled carbon
1.3 Characterization Scanning electron microscopy (SEM, Nova Nano 430, FEI, Japan) was operated at 1 kV. Raman spectra were collected on a Jobin Yvon LabRam Aramis micro-Raman spectrome-ter with excitation wavelength of 632.8 or 532 nm with a spot size of 1 m, using a 100× air objective. The laser en-μ
Surface-Enhanced Raman Scattering from small numbers of
Scattering from small numbers of single-walled carbon nanotubes and oxidised single-walled carbon nanotubes, Chemical Physics Letters (2012), doi: 10.1016/j.cplett.2012.02.052 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript.
Digital Isotope Coding to Trace Growth Process of Individual
microscopy (TEM)26 28, scanning electron microscopy (SEM)29 14and Raman spectroscopy revealed the detailed growth behaviors of individual SWCNTs. These studies employed extreme growth conditions due to the nature of the in situ measurement, often resulting in defective or short carbon nanotubes (CNTs). Also, the limited number of CNTs that can be
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Keywords: Catalytic Chemical Vapor Deposition, Carbon Nanotubes, Thermodynamic Analysis, Chromatography. [email protected] irtroduction Since their discovery by Iij: ima , the carbon nanotubes were intensively studied because of their very interesting electrical, mechanical, and optical properties. A large number of
Multiwall BCN/C Nanotube Junction and Its Rectification Behavior
Jul 09, 2007 Raman characterization A micro-Raman spectroscopy with 514 nm laser excitation was used to further study the growth model. The size of the illumination spot is about 1 µ m2. As described in the text, the pure carbon nanotubes were grown first, and then the BCN nanotubes. Raman spectra were collected on the wall of the nanotube arrays.
SILICON CARBIDE NANOWIRES AND COMPOSITES OBTAINED FROM CARBON
OBTAINED FROM CARBON NANOTUBES By YUEJIAN WANG Bachelor of Engineering, 1996 Tsinghua University Beijing, P. R. China Master of Science, 2002 Stephen F. Austin State University Nacogdoches, TX Submitted to the Graduate Faculty of the College of Science and Engineering Texas Christian University In partial fulfillment of the requirements
2011B Accepted CINT User Proposals
Studies of Exciton-Phonon Coupling Behavior in Armchair Single-Walled Carbon Nanotubes and Double-Walled Carbon Nanotubes Using Raman Scattering Excitation Profiles; Junichiro Kono, Rice University: Steve Doorn Subwavelength Tunable Semiconductor Plasmon Terahertz Detectors; Eric Shaner, Sandia National Laboratory: John Reno
Luminescence Properties of Individual Empty and Water-filled
nanotubes,14 Fractions containing exclusively empty nanotubes and fractions containing a majority of filled tubes with a small proportion of empty nanotubes (less than 10%) were obtained. The ratio of empty/filled tubes in the different fractions was obtained by resonant Raman scattering (see Supporting Information Figures S1-S2).
Work function engineering of ZnO electrodes by using p-type
mat) of nanotubes [30,31]. Raman characterization of doped nanotubes shows features in some bands that allow the amount of disorder to be quantiﬁed, in both nitrogen-doped  and boron-doped [33,34] nanotubes. In this paper we report a detailed characterization of doped carbon nanotubes by atomic force microscopy (AFM), including scanning
carbon nanotubes. I am especially interested in simulations in which molecular Characterization of carbon nanotubes using Raman excitation profiles
The State of HiPco Single-Walled Carbon Nanotubes in 2019
Raman spectra were collected using a Renishaw inViaŠ Raman microscope (Wotton-under-Edge, UK) equipped with 514, 633, and 785 nm lasers and a Leica (Leica Microsystems, Bu alo Grove, IL, USA) PL Fluortar L50 0.55 long working distance objective lens. Raman laser excitation powers were
ence of silica precursor on th e cobalt incorporation on m
Raman spectra of nanotubes were recorded in a Horiba Laser Raman Spectrophotometer model LabRAM HR with an excitation radiation at 736 cm-1. CHARACTERIZATION The nitrogen adsorption-desorption studies were carried out at -196 ºC in a Micromeritics ASAP 2010 to examine the mesoporous properties of the catalysts. The catalysts were
Supporting Information for: Reproducible Layer-by-Layer
Raman spectra and film transparency measurements were carried out using Raman spectroscopy (with excitation wavelength of 632.8 nm) and UV-vis-near-IR 20 spectrophotometer (Perkin Elmer Lambda 750), respectively.
Huttunen, M.J.; Herranen, Olli; Johansson, A.; Jiang, H
Raman excitation profiles of metallic single-walled carbon nanotubes Božidar Nikoli In situ spectroscopy of ligand exchange reactions at the surface of colloidal gold and silver nanoparticles Rebecca Dinkel, Wolfgang Peukert and Björn Braunschweig The imaging and mapping of biological structures G Filippidis, C Kouloumentas, D Kapsokalyvas et al.
Tutorial on Physical Properties and Characterization of
Raman lineshape can distinguish metallic and semiconducting nanotubes Kataura plots relate the E ii to (n,m) tubes Resonant Raman scattering in carbon nanotubes M. A. Pimenta et al. Phys. Rev. B, 58, R16016, (1998) A. M. Rao et al., Science 275 (1997) 187
Table of Contents
substrate located 1.5 cm away from the burner nozzle and are analyzed using TEM, SEM with EDS, and Raman spectroscopy to ascertain the presence of nanotubes. Different carbon structures including carbon nanofibers, MWNTs, and SWNTs are generated using this technique. The presence of MWNTs is observed under TEM, while nanofibers are viewed under
2010A Accepted CINT User Proposals
Study of exciton-phonon coupling behavior in armchair single-walled carbon nanotubes and double-walled carbon nanotubes using raman scattering excitation profiles, Junichiro Kono, Rice University; Lead CINT Scientist: Stephen Doorn Charge and spin pump in strongly correlated one-dimensional GaAs systems, Jian Huang,
ELECTRONIC PROPERTIES OF SYNTHETIC NANOSTRUCTURES
STM Investigation of Irradiated Carbon Nanotubes 149 Z. Osvath, G. Vertesy, G. Peto, I. Szabo, J. Gyulai, W. Maser, and L. P. Biro A Resonant Raman Study of SWNTs under Electrochemical Doping 153 P. M Rafailov, M. Stoll, J. Maultzsch, and C. Thomsen Raman on Carbon Nanotubes Using a Tunable Laser and Comparison with Photoluminescence 157
On-chip optical trapping and Raman spectroscopy using a
carbon nanotubes , Appl. Phys. Lett. 102 Today s strong interest in characterization of biological samples with optical methods has Raman excitation and signal collection [14
Characterization of carbon nanotubes by Raman spectroscopy
Characterization of carbon nanotubes by the Raman spectroscopy 435 is observable for defect-free sp2 carbons. These bands show a dependence on the chi-rality and diameter of nanotubes  and on laser excitation energy .
A Low-Energy Electron Beam Does Not Damage Single- Walled
Single-walled carbon nanotubes (SWNTs)1-2 and single-layer graphene3 were synthesized using chemical vapor deposition (CVD). For the characterization of SWNTs, the following analyses were carried out. The SWNTs were characterized by Raman spectroscopy (WITec Alpha300R) using a 532-nm laser excitation source operated at 2 mW.
Spectroscopic signatures of topological and diatom-vacancy
Carbon nanotube characterization relies extensively on Raman spectroscopy,10 and it is very appealing to apply optical methods to distinguish between defect types of CNTs. The D-band in the Raman spectra of sp2 carbons is a signature of defects in the graphene lattice11 and is often used to character-ize defective CNTs.