Synthesis, Characterization and Magnetic Properties of Defective Nitrogen-Doped Multiwall Carbon Nanotubes Encapsulating Ferromagnetic Nanoparticles

Nitrogen-doped multi-walled carbon nanotubes (CNxMWNTs) with multiple morphological defects were produced using a modified chemical vapor deposition (CVD) method. In a typical CNxMWNTs synthesis by CVD, an acetone trap is used to catch organic by-products from pyrolysis. In the present work, an aqueous solution of NaCl (26.82 wt%) was used in the trap, instead of acetone. Carbon nanotubes with sharp tips and lumps were found in the products. Scanning electron microscopy (SEM) and high resolution transmission electron microscopy showed the formation of nanoparticles of different shapes inside the nanotubes. The electronic and magnetic properties were studied using a physical properties measurement Evercool system (PPMS). With this simple change in the CVD-trap, it is possible to control the morphology of carbon nanotubes and metallic nanoparticles. Differences in gas flow are proposed as a possible mechanism to produce these changes in both nanoparticles and CNxMWNTs.

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Electron Microscopy and Raman Characterization of Multi-Walled Carbon Nanotubes Grown by Chemical Vapor Deposition

Microscopy and Microanalysis ◽

10.1017/s1431927608086984 ◽

2008 ◽

Vol 14 (S2) ◽

pp. 304-305

Author(s):

M Ellis ◽

T Jutarosaga ◽

S Smith ◽

Y Wei ◽

S Seraphin

Keyword(s):

Electron Microscopy ◽

Carbon Nanotubes ◽

Chemical Vapor Deposition ◽

New Mexico ◽

Vapor Deposition ◽

Chemical Vapor ◽

Multi Walled Carbon Nanotubes ◽

Walled Carbon Nanotubes ◽

Raman Characterization

Extended abstract of a paper presented at Microscopy and Microanalysis 2008 in Albuquerque, New Mexico, USA, August 3 – August 7, 2008

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The Effect of Inoculum in the Preparation of Fermented Tapioca for Nanotechnology Applications Based on FT-IR Studies

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.667.534 ◽

2013 ◽

Vol 667 ◽

pp. 534-537

Author(s):

M.Z. Nuraini ◽

S. Aishah ◽

S.F. Nik ◽

Mohamad Rusop

Keyword(s):

Carbon Nanotubes ◽

Gas Flow ◽

Deposition Time ◽

Chemical Vapor ◽

Deposition Process ◽

Ir Studies ◽

Multi Walled Carbon Nanotubes ◽

Ft Ir ◽

Walled Carbon Nanotubes ◽

Ft Ir Spectroscopy

Fermented tapioca which is a new starting material was used as a carbon precursor. Carbon nanotubes (CNTs) were deposited on silicon wafer (Si) by Thermal Chemical Vapor Deposition (TCVD). The gas flow of Argon (Ar) was constant at 70 bubbles per minute and 20 minutes of deposition time. Before the deposition process, silicon was coated with Nickel using spin coater. Various parameters such as amount of inoculums have been studied. Chemical functional groups of carbon nanotubes were characterized using FT-IR Spectroscopy. The FT-IR result shows peaks attributed to multi–walled carbon nanotubes (MWCNT) vibration modes.

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Field emission property of vertically aligned nitrogen-doped multi-walled carbon nanotubes produced by chemical vapor deposition

Materials Today Proceedings ◽

10.1016/j.matpr.2018.04.039 ◽

2018 ◽

Vol 5 (7) ◽

pp. 14965-14969 ◽

Cited By ~ 1

Author(s):

Pongpanot Rindhatayathon ◽

Worawut Muangrat ◽

Mati Horprathum ◽

Suphakan Kijamnajsuk ◽

Wolfgang Pfeiler ◽

...

Keyword(s):

Carbon Nanotubes ◽

Chemical Vapor Deposition ◽

Field Emission ◽

Vapor Deposition ◽

Chemical Vapor ◽

Field Emission Property ◽

Nitrogen Doped ◽

Multi Walled Carbon Nanotubes ◽

Vertically Aligned ◽

Walled Carbon Nanotubes

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Simultaneous Analysis of Hydroquinone, Arbutin, and Ascorbyl Glucoside Using a Nanocomposite of Ag@AgCl Nanoparticles, Ag2S Nanoparticles, Multiwall Carbon Nanotubes, and Chitosan

Nanomaterials ◽

10.3390/nano10081583 ◽

2020 ◽

Vol 10 (8) ◽

pp. 1583

Author(s):

Nutthaya Butwong ◽

Thidarat Kunawong ◽

John H. T. Luong

Keyword(s):

Electron Microscopy ◽

Carbon Nanotubes ◽

High Performance ◽

Multiwall Carbon Nanotubes ◽

High Performance Liquid Chromatographic ◽

Hplc Method ◽

Simultaneous Analysis ◽

Measured Concentration ◽

Multi Walled Carbon Nanotubes ◽

Ag2s Nanoparticles

A nanocomposite comprising Ag nanoparticles on AgCl/Ag2S nanoparticles was decorated on multi-walled carbon nanotubes and used to modify a glassy carbon electrode. Chitosan was also formulated in the nanocomposite to stabilize Ag2S nanoparticles and interact strongly with the glucose moiety of arbutin (AR) and ascorbyl glucoside (AA2G), two important ingredients in whitening lotion products. The modified electrode was characterized by Fourier transform infrared spectroscopy (FTIR), transmission electron microscopy (TEM), and scanning electron microscopy (SEM) and cyclic voltammetry and used for the simultaneous analysis of hydroquinone (HQ), AR, and AA2G. The electrode showed excellent electrocatalysis towards the analytes by shifting the anodic peak potential to a negative direction with ≈5-fold higher current. The sensor displayed a linearity of 0.91–27.2 μM for HQ, 0.73–14.7 μM for AR, and 1.18–11.8 μM for AA2G, without cross-interference. A detection limit was 0.4 μM for HQ, 0.1 μM for AR, and 0.25 μM for AA2G. The sensor was applied to determine HQ, AR, and AA2G spiked in the whitening lotion sample with excellent recovery. The measured concentration of each analyte was comparable to that of the high performance liquid chromatographic (HPLC) method.

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Nitrogen-Doped Carbon Nanotubes and Graphene Nanohybrid for Oxygen Reduction Reaction in Acidic, Alkaline and Neutral Solutions

Journal of Nano Research ◽

10.4028/www.scientific.net/jnanor.30.50 ◽

2015 ◽

Vol 30 ◽

pp. 50-58 ◽

Cited By ~ 6

Author(s):

Ji Yue Liu ◽

Zan Wang ◽

Jing Yan Chen ◽

Xin Wang

Keyword(s):

Electron Microscopy ◽

Carbon Nanotubes ◽

Oxygen Reduction Reaction ◽

Oxygen Reduction ◽

Chemical Vapor ◽

Electrochemical Measurement ◽

Reduction Reaction ◽

Neutral Medium ◽

Nitrogen Doped ◽

Nitrogen Doped Carbon

Nitrogen-doped carbon nanotubes (N-CNTs) have beenprepared on FeNi catalyst by plasma-enhanced chemical vapor deposition in amixture of N2, O2, and CH4. On the opened topof CNT, multi-layer graphene grown self-assembly was observed by transmissionelectron microscopy and high resolution transmission electron microscopy. Thenanohybrid film analyzed by scanning electron microscopy exhibited a porous and3D morphology and pyridinic and graphitic nitrogen structure confirmed by x-rayphotoelectron spectroscopy. Electrochemical measurement indicated that the filmfacilitated about three-electron transferpathway for oxygen reduction reaction in neutral medium and two-electronreductions in both alkaline and acidic solutions.

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Magnetic properties of aligned iron containing nitrogen-doped multi-walled carbon nanotubes

Materials Chemistry and Physics ◽

10.1016/j.matchemphys.2018.02.003 ◽

2018 ◽

Vol 209 ◽

pp. 280-290 ◽

Cited By ~ 3

Author(s):

Ibrahim B. Usman ◽

Boitumelo Matsoso ◽

Kamalakannan Ranganathan ◽

Deena Naidoo ◽

Neil J. Coville ◽

...

Keyword(s):

Carbon Nanotubes ◽

Magnetic Properties ◽

Nitrogen Doped ◽

Multi Walled Carbon Nanotubes ◽

Walled Carbon Nanotubes

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Study of vertically aligned multi-walled carbon nanotubes array for an absolutely black body

Perspektivnye Materialy ◽

10.30791/1028-978x-2021-4-19-25 ◽

2021 ◽

Vol 4 ◽

pp. 19-25

Author(s):

T. N. Smetyukhova ◽

◽

E. A. Vysotina ◽

D. O. Monakhov ◽

S. K. Sigalayev ◽

...

Keyword(s):

Carbon Nanotubes ◽

Absorption Coefficient ◽

Gas Flow ◽

Chemical Vapor ◽

Black Body ◽

Small Mass ◽

Multi Walled Carbon Nanotubes ◽

High Absorption Coefficient ◽

Absolutely Black Body ◽

Walled Carbon Nanotubes

An array of vertically oriented multi-walled carbon nanotubes (VOMWCNT), obtained by chemical vapor deposition (CVD) on a silicon substrate without preliminary catalyst deposition, has been comprehensively investigated. The synthesis was carried out for 30 minutes in the reactor of a carbon nanotube synthesis unit under conditions of decomposition of the reaction mixture (ferrocene in heptane) at a temperature of 800 °C at a carrier gas flow rate of 200 ml/min. The structure and geometric characteristics of the array’s carbon nanotubes were determined using scanning and transmission electron microscopy and Raman spectroscopy. The spectral coefficient of diffuse reflection (SDR) into the hemisphere in the wavelength range from 5,0 to 15,0 μm was determined. From the obtained experimental data, it was found that the emissivity (absorption coefficient) of an array of carbon nanotubes with a height of (230 – 250) μm is 0,98 – 0,99 in the spectral range from 5,0 to 13,7 μm and 0,975 – 0,995 in the range from 13,7 to 15,0 μm. Such a VOMWCNT array can be used to develop an absolutely black body with a high absorption coefficient and small mass and size characteristics, which is used for calibrating spacecraft’s infrared spectrometers.

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Pyrrolic nitrogen-doped multiwall carbon nanotubes using ball-milled slag-SiC mixtures as a catalyst by aerosol assisted chemical vapor deposition

Materials Research Express ◽

10.1088/2053-1591/ab6ace ◽

2020 ◽

Author(s):

Sofía Magdalena Vega-Diaz ◽

Viviana Jehová González ◽

Aaron Morelos-Gomez ◽

Ferdinando Tristán-López ◽

Gladis Judith Labrada-Delgado ◽

...

Keyword(s):

Carbon Nanotubes ◽

Chemical Vapor Deposition ◽

Vapor Deposition ◽

Multiwall Carbon Nanotubes ◽

Chemical Vapor ◽

Nitrogen Doped ◽

Multiwall Carbon

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Reinforcing Effects of Poly(D-Lactide)-g-Multiwall Carbon Nanotubes on Polylactide Nanocomposites

Journal of Nanoscience and Nanotechnology ◽

10.1166/jnn.2015.11280 ◽

2015 ◽

Vol 15 (10) ◽

pp. 8086-8092 ◽

Cited By ~ 3

Author(s):

Jeong Hee Yang ◽

Jae Yun Lee ◽

In-Joo Chin

Keyword(s):

Electron Microscopy ◽

Mechanical Properties ◽

Carbon Nanotubes ◽

Testing Machine ◽

Multiwall Carbon Nanotubes ◽

Hydroxyl Groups ◽

Scanning Calorimetry ◽

Transmission Electron ◽

Multi Walled Carbon Nanotubes ◽

Walled Carbon Nanotubes

Polylactide (PLA) nanocomposites with multi-walled carbon nanotubes (MWNTs) grafted with poly(L-lactide) or poly(D-lactide) were prepared by solution casting, and their thermal and mechanical properties were evaluated. MWNTs containing hydroxyl groups were treated by ring-opening polymerization of either L-lactide or D-lactide. Fourier transform infrared spectroscopy confirmed that the MWNT surfaces had been modified by the PLLA or PDLA chains. The thermal properties were measured by differential scanning calorimetry and thermogravimetric analysis. The mechanical properties were examined using a universal testing machine. The morphology of the fractured surfaces of the PLA nanocomposites was observed by scanning electron microscopy and transmission electron microscopy. PDLA-g-MWNTs were dispersed more uniformly compared to PLLA-g-MWNTs in the PLA matrix. The incorporation of PDLA-g-MWNTs greatly improved the tensile strength of the nanocomposites regardless of the contents. Thermal analysis revealed different characteristics at specific composites depending on the type of modification.

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