Effect of Carbon Fibers’ Surface Modification on the In Situ Growth of Carbon Nanotubes

2012 ◽  
Vol 512-515 ◽  
pp. 761-764
Author(s):  
Jian Bao Hu ◽  
Shao Ming Dong ◽  
Xiang Yu Zhang ◽  
Zhi Hui Hu ◽  
Bo Lu ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Surface Modification ◽  
Carbon Fibers ◽  
Photoelectron Spectroscopy ◽  
Metal Uptake ◽  
Chemical Properties ◽  
X Ray ◽  
Pretreatment Time ◽  
Physicochemical Methods

Surface modification of carbon fibers(CF) by physicochemical methods directs an attractive approach for improvement of metal uptake from solutions. We investigated pretreatment of carbon fibers by HNO3 with different time on absorption of catalysts, which is related to the coverage of carbon nanotubes (CNTs) grown on Carbon fibers. The effects of surface modifications on the properties of carbon fibers were studied by X-Ray photoelectron spectroscopy. The modifications bring about variation in the chemical properties. The modification increased a large number of surface functional groups such as hydroxyl and carbonyl. The HNO3 modification increases the catalysts absorption. The coverage of CNTs on CF increases with pretreatment time, which was studied by SEM.

Multiwalled Carbon Nanotubes Covered with Cobalt (II) Phthalocyanine by In Situ Synthesis and its Electrochemical Sensing Performance towards DA and UA

2014 ◽  
Vol 809-810 ◽  
pp. 43-52
Author(s):  
Hua Hua Wang ◽  
Nan Li ◽  
Kai Li ◽  
Yuan Bu ◽  
Wen Le Dai ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Multiwalled Carbon Nanotubes ◽  
Photoelectron Spectroscopy ◽  
Simultaneous Detection ◽  
Thick Layer ◽  
Electrochemical Sensing ◽  
Multiwalled Carbon ◽  
X Ray ◽  
Platinum Particles

Multiwalled carbon nanotubes (MWCNTs) as an excellent supporter covered with a thick layer of cobalt phthalocyanine (CoPc) were prepared by in-situ synthesis. Platinum particles were adopted to enhance the conductivity of CoPc-MWCNTs. The final nanocomposite Pt-CoPc-MWCNTs was characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and transmission electron microscopy (TEM). Strong aromatic π-π stacking between MWCNTs and CoPc made CoPc in-situ forming on MWCNTs. With homogeneous thickness of CoPc covered on the MWCNTs and Pt particles equally distributed, the nanocomposite was used as electrocatalyst. The electrochemical properties of the composite got researched by casting the dispersion of Pt-CoPc-MWCNTs on the glassy carbon electrode. Compared with other modified electrodes, Pt-CoPc-MWCNTs/GC electrode exhibited excellent electrochemical activity towards dopamine (DA) and uric acid (UA). Linear responses for DA and UA were obtained in the ranges of 5 to 170 μM and 5 to 100 μM, and limits of detection were 2.6 and 1.4 μM (S/N= 3), respectively. Simultaneous detection of DA and UA in the presence of ascorbic acid (AA) also displayed selective property, with no interference to each other.

Multi-wall carbon nanotubes with nitrogen-containing carbon coating

2013 ◽  
Vol 67 (8) ◽  
Author(s):  
Elena Tomšík ◽  
Zuzana Morávková ◽  
Jaroslav Stejskal ◽  
Miroslava Trchová ◽  
Petr Šálek ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Photoelectron Spectroscopy ◽  
Carbon Coating ◽  
Covalent Bonding ◽  
Inert Atmosphere ◽  
New Materials ◽  
X Ray ◽  
Multi Wall Carbon Nanotubes ◽  
Transmission Electron

AbstractPolyaniline coating was deposited on the surface of multi-wall carbon nanotubes of Russian and Taiwanese origin in situ during the polymerization of aniline. The deposited polyaniline film was subsequently carbonized under an inert atmosphere at various temperatures to produce coaxial coating of the carbon nanotubes with nitrogen-containing carbon. The new materials were investigated by infrared and Raman spectroscopies, which demonstrated the conversion of the polyaniline coating to a carbonized structure. X-ray photoelectron spectroscopy proved that the carbonized overlayer contains nitrogen atoms in various covalent bonding states. Transmission electron microscopy confirmed the coaxial structure of the composites. The Brunauer-Emmett-Teller method was used to estimate the specific surface area, the highest being 272 m2 g−1. The conductivity of 0.9–16 S cm−1 was measured by the four-point method, and it was only a little affected by the carbonization of the polyaniline coating.

The Nucleophilic Addition of In Situ Generated Calcium Thiolate of Benzonitrile to the Sidewall of Single-Walled Carbon Nanotubes: A New and Direct Approach for Thioamidation

2016 ◽  
Vol 69 (2) ◽  
pp. 198 ◽  
Author(s):  
Hossein Reza Darabi ◽  
Atefeh Roozkhosh ◽  
Kioumars Aghapoor
Keyword(s):  
Carbon Nanotubes ◽  
Photoelectron Spectroscopy ◽  
Nucleophilic Addition ◽  
Single Walled Carbon Nanotubes ◽  
Thioacetic Acid ◽  
Covalent Functionalization ◽  
X Ray ◽  
Single Walled Carbon ◽  
Walled Carbon Nanotubes

A new and efficient method for the thioamidation of single-walled carbon nanotubes (SWCNTs) has been introduced by direct addition of an intermediately generated nitrogen-based nucleophile. In this approach, there is a synergistic effect between benzonitrile, CaH2, and thioacetic acid leading to the formation of calcium thiolate which subsequently added to the sidewalls of the tubes. This finding was also confirmed when SWCNTs with benzonitrile moieties on their sidewalls were tested. The successful covalent functionalization of SWCNTs has been proven by thermogravimetric analysis, Raman, IR, and X-ray photoelectron spectroscopy techniques.

Highly active carbon nanotube–promoted Rh-Mn-Li/SiO2 catalysts for the synthesis of C2+ oxygenates from syngas

2021 ◽  
pp. 174751982098472
Author(s):  
Jun Yu ◽  
Ying Han ◽  
Guoqing Chen ◽  
Xiuzhen Xiao ◽  
Haifang Mao ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Photoelectron Spectroscopy ◽  
Co Hydrogenation ◽  
X Ray ◽  
Highly Active ◽  
Transmission Electron ◽  
Co Insertion ◽  
Temperature Programmed Surface Reaction ◽  
Temperature Programmed ◽  
Oxygenate Synthesis

The effect of carbon nanotubes on the catalytic properties of Rh-Mn-Li/SiO2 catalysts was investigated for CO hydrogenation. The catalysts were comprehensively characterized by means of X-ray power diffraction, N2 sorption, transmission electron microscope, H2–temperature-programmed reduction, CO–temperature-programmed desorption, temperature-programmed surface reaction, and X-ray photoelectron spectroscopy. The results showed that an appropriate amount of carbon nanotubes can be attached to the surface of the SiO2 sphere and can improve the Rh dispersion. Moderate Rh-Mn interaction can be obtained by doping with the appropriate amount of carbon nanotubes, which promotes the formation of strongly adsorbed CO and facilitates the progress of CO insertion, resulting in the increase in the selectivity of C2+ oxygenate synthesis.

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