Growth of aligned multi-walled carbon nanotubes: First in situ and time-resolved X-ray diffraction analysis

2011 ◽  
Vol 248 (11) ◽  
pp. 2449-2453 ◽  
Author(s):  
Périne Landois ◽  
Stéphan Rouziére ◽  
Mathieu Pinault ◽  
Dominique Porterat ◽  
Cristian Mocuta ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Diffraction Analysis ◽  
X Ray Diffraction ◽  
Time Resolved ◽  
X Ray ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

scholarly journals Organic–Inorganic Nanohybrid Electrochemical Sensors from Multi-Walled Carbon Nanotubes Decorated with Zinc Oxide Nanoparticles and In-Situ Wrapped with Poly(2-methacryloyloxyethyl ferrocenecarboxylate) for Detection of the Content of Food Additives

Nanomaterials ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 1388
Author(s):  
Jing-Wen Xu ◽  
Zhuo-Miao Cui ◽  
Zhan-Qing Liu ◽  
Feng Xu ◽  
Ya-Shao Chen ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Zinc Oxide ◽  
Electron Microscope ◽  
Zinc Oxide Nanoparticles ◽  
Electrochemical Sensors ◽  
Oxide Nanoparticles ◽  
X Ray ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

An electrochemical sensor for detection of the content of aspartame was developed by modifying a glassy carbon electrode (GCE) with multi-walled carbon nanotubes decorated with zinc oxide nanoparticles and in-situ wrapped with poly(2-methacryloyloxyethyl ferrocenecarboxylate) (MWCNTs@ZnO/PMAEFc). MWCNTs@ZnO/PMAEFc nanohybrids were prepared through reaction of zinc acetate dihydrate with LiOH·H2O, followed by reversible addition-fragmentation chain transfer polymerization of 2-methacryloyloxyethyl ferrocenecarboxylate, and were characterized by Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), Raman, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), atomic force microscope (AFM), scanning electron microscope (SEM), and transmission electron microscope (TEM) techniques. The electrochemical properties of the prepared nanohybrids with various composition ratios were examined by cyclic voltammetry (CV), and the trace additives in food and/or beverage was detected by using differential pulse voltammetry (DPV). The experimental results indicated that the prepared nanohybrids for fabrication of electrochemical modified electrodes possess active electroresponse, marked redox current, and good electrochemical reversibility, which could be mediated by changing the system formulations. The nanohybrid modified electrode sensors had a good peak current linear dependence on the analyte concentration with a wide detection range and a limit of detection as low as about 1.35 × 10−9 mol L−1, and the amount of aspartame was measured to be 35.36 and 40.20 µM in Coke zero, and Sprite zero, respectively. Therefore, the developed nanohybrids can potentially be used to fabricate novel electrochemical sensors for applications in the detection of beverage and food safety.

Preparation and Luminescence Property of Multi-Walled Carbon Nanotubes/Europium Doped Yttria Oxide Hybrids

2012 ◽  
Vol 535-537 ◽  
pp. 305-309
Author(s):  
T.G. Liu ◽  
C.S. Chen ◽  
X.D. Xie ◽  
C.Y. Qiu
Keyword(s):  
Carbon Nanotubes ◽  
Electron Microscope ◽  
Optical Property ◽  
Luminescence Spectroscopy ◽  
X Ray Diffraction ◽  
X Ray ◽  
Molar Ratios ◽  
Transmission Electron ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

In order to improve their optical property, multi-walled carbon nanotubes (MWNTs) were decorated with europium doped yttria oxide (Y2O3:Eu3+) nanoparticles by co-deposition method, and the products were examined by X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM) and luminescence spectroscopy. Experimental results illuminate that MWNTs can be decorated by the Y2O3:Eu3+ nanoparticles at annealed temperature of 600 and 750°C, respectively. The optical property of MWNTs/Y2O3:Eu3+ nanohybrids shows the most excellent when the MWNTs concentratin is 0.5 wt.% and the molar ratios of Eu to Y is 5:95.

Preparation and Structure of Amino-Modified Multi-Walled Carbon Nanotubes

2015 ◽  
Vol 1096 ◽  
pp. 441-445
Author(s):  
Yun Hua Li ◽  
Jun Fen Sun
Keyword(s):  
Carbon Nanotubes ◽  
Raman Spectroscopy ◽  
Elemental Analysis ◽  
Chemical Structure ◽  
Ethylene Diamine ◽  
X Ray Diffraction ◽  
X Ray ◽  
Multi Walled Carbon Nanotubes ◽  
Ft Ir ◽  
Walled Carbon Nanotubes

Carboxylic multi-walled carbon nanotubes (MWCNTs-COOH) were modified by using ethylene diamine (EDA) to prepare amino-modified multi-walled carbon nanotubes (MWCNTs-NH2). The chemical structure of MWCNTs-NH2 was characterized by FT-IR, Raman spectroscopy, X-ray diffraction (XRD) test, TG analysis and elemental analysis. The results show that MWCNTs-COOH was effectively modified by EDA. Key words: MWCNTs-COOH; ethylene diamine; chemical modification; elemental analysis

scholarly journals Chemical Synthesis, Functionalization and Characterization of Multiwalled Carbon Nanotubes

2020 ◽  
Vol 6 (3) ◽  
pp. 905-907
Author(s):  
S.S. Gautam ◽  
G.P. Satsangi ◽  
V.R. Satsangi
Keyword(s):  
Carbon Nanotubes ◽  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Fourier Transform Infrared Spectroscopy ◽  
X Ray Diffraction ◽  
X Ray ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes ◽  
Functionalized Mwcnts

This research work is attempted to synthesize, functionalize and to characterize multi walled carbon nanotubes (MWCNTs). The synthesis of multi walled carbon nanotubes was done by chemical vapor deposition (CVD) method. The characterization of MWCNTs was done by adopting the following techniques such as field emission scanning electron microscope, X-ray diffraction, Fourier-transform infrared spectroscopy. The crystalline quality of MWCNTs was confirmed from the analysis of X-ray diffraction pattern. FE-SEM image obtained for MWCNTs and functionalized MWCNTs and it has been seen that dimeter of most of the MWCNTs lies around 90 nm, where as, functionalized MWCNTs diameter is smaller i.e., around 35 nm only. Fourier-transform infrared spectroscopy study confirmed the presence of –COOH and H- bonded –OH in functionalized MWCNTs.

Fabrication and characterization of MWCNT/natural Azerbaijani bentonite electroconductive ceramic composites

2019 ◽  
Vol 53 (26-27) ◽  
pp. 3909-3923 ◽  
Author(s):  
Asgar Huseynov ◽  
Aydin Israfilov ◽  
Samira Mammadova ◽  
Sevda Abdullayeva ◽  
Sergey Sokolov ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Electrical Conductivity ◽  
Carbon Nanotube ◽  
Ceramic Composites ◽  
X Ray Diffraction ◽  
X Ray ◽  
Multi Walled Carbon Nanotube ◽  
Multi Walled Carbon Nanotubes ◽  
Bentonite Clays ◽  
Walled Carbon Nanotubes

Multi-walled carbon nanotubes have been synthesized by Aerosol-Chemical Vapor Deposition method. Carbon nanotubes firstly have been used as filler in affordable and prevalent natural Azerbaijani bentonite clays for fabrication electroconductive ceramic composites. In this paper, multi-walled carbon nanotubes/natural Azerbaijani bentonite ceramic composites were prepared by two-factor mechanical method and followed by calcination at 1050℃ in an inert atmosphere. The ceramic composites were characterized by scanning electron microscope, atomic force microscope, X-ray diffraction and thermogravimetric-differential-thermal analysis. X-ray diffraction analysis confirmed the presence of two principal components – multi-walled carbon nanotube and bentonite in composites. From the thermogravimetric-differential-thermal data, it was revealed that multi-walled carbon nanotube/ bentonite ceramic composites demonstrate thermo-oxidative stability up to 580–640℃. Scanning electron microscope images demonstrated a sufficiently high dispersibility of carbon nanotubes and satisfactory homogeneity in the composites. Experimental results demonstrated that by increasing the mass fraction of multi-walled carbon nanotubes from 1% to 8% in multi-walled carbon nanotube/bentonite ceramic composites, the electrical conductivity enhances substantially. The enhancement of electrical conductivity of the composites explained the mass fraction of multi-walled carbon nanotubes, as well as the uniform dispersion of multi-walled carbon nanotubes in the bentonite clays. Compared with other 8% multi-walled carbon nanotubes/bentonite ceramic composites, the electrical conductivity of heptane-multi-walled carbon nanotube/Gobu bentonite (σ = 397 S·m−1) and heptane-multi-walled carbon nanotubes/Atyali (σ = 305 S·m−1) composites is 2–5 times higher than the conductivity of composites obtained with cyclohexane carbon nanotubes- cyclohexane-multi-walled carbon nanotube/Atyali (σ = 78 S·m−1), cyclohexane-multi-walled carbon nanotube/Gobu (σ = 111,5 S·m−1). These results can be explained with the structure, the number of layers, purity and diameter distribution, as well as the type and amount of defects in internal and external layers of Hep-multi-walled carbon nanotubes which cause better dispersion in bentonite clays. Due to the high conductivity and high temperature stability, these composites can be used as promising material for fabrication heating elements, electrodes, substrates for microelectronic devices, etc.

MECHANICAL OXIDATION OF MULTI-WALLED CARBON NANOTUBES AS A REPLACEMENT OF ACID OXIDATION METHOD

NANO ◽  
2014 ◽  
Vol 09 (08) ◽  
pp. 1450091
Author(s):  
PRIYANKA PANDEY ◽  
SMITA MOHANTY ◽  
SANJAY K. NAYAK
Keyword(s):  
Carbon Nanotubes ◽  
Acid Treatment ◽  
Xrd Analysis ◽  
Treatment Method ◽  
Acid Oxidation ◽  
X Ray Diffraction ◽  
Oxidation Method ◽  
X Ray ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

In the present study, a candid approach using mechanical oxidation, for modification of multi-walled carbon nanotubes (CNTs) has been utilized, and its advantages over conventional acid oxidation methods have been established. Higher concentration of acidic groups was found in case of mechanically oxidized CNTs (i.e., McCNT) as compared to acid oxidized CNT (i.e., ACNT). Raman spectrum exhibited greater degree of transformation of sp2 carbon into sp3 carbon. X-ray diffraction (XRD) analysis revealed maintained crystalline organization in McCNT. The major finding of the study was that, the mechanical oxidation method can be used easily to replace the conventional acid treatment method. This is because in the mechanical oxidation crystalline organization of CNTs can be maintained, relatively higher number of acid groups can be incorporated, no loss to the mass of CNTs is allowed etc.

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