Synthesis and Characterization of SiO2@CNTs Microparticles: Evaluation of Microwave-Induced Heat Production

This study was focused on the growth of multi-walled carbon nanotubes (MWCNTs) on iron chloride-functionalized silica microspheres. In addition, the microwave absorption potential and the subsequent heat production of the resulting structures were monitored by means of infrared thermometry and compared with pristine commercially available MWCNTs. The functionalized silica microparticle substrates produced MWCNTs without any amorphous carbon but with increased structural defects, whereas their heat production performance as microwave absorbents was comparable to that of the pristine MWCNTs. Two-minute microwave irradiation of the SiO2@CNTs structures resulted in an increase in the material’s temperature from ambient temperature up to 173 °C. This research puts forward a new idea of charge modulation of MWCNTs and sheds light on an investigation for the development of bifunctional materials with improved properties with respect to efficient microwave absorbance.

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Effects of structural defects on strength and fracture properties of multi-walled carbon nanotubes

Transactions of the JSME (in Japanese) ◽

10.1299/transjsme.16-00283 ◽

2017 ◽

Vol 83 (847) ◽

pp. 16-00283-16-00283 ◽

Cited By ~ 4

Author(s):

Itaru TAMAKI ◽

Keiichi SHIRASU ◽

Takamichi MIYAZAKI ◽

Go YAMAMOTO ◽

Raman BEKAREVICH ◽

...

Keyword(s):

Carbon Nanotubes ◽

Structural Defects ◽

Fracture Properties ◽

Multi Walled Carbon Nanotubes ◽

Walled Carbon Nanotubes

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Defect-induced vibrational response of multi-walled carbon nanotubes using resonance Raman spectroscopy

Journal of Materials Research ◽

10.1557/jmr.2005.0414 ◽

2005 ◽

Vol 20 (12) ◽

pp. 3368-3373 ◽

Cited By ~ 44

Author(s):

S.A. Curran ◽

J.A. Talla ◽

D. Zhang ◽

D.L. Carroll

Keyword(s):

Carbon Nanotubes ◽

Raman Spectroscopy ◽

Acid Treatment ◽

Defect Formation ◽

Double Resonance ◽

Resonance Raman ◽

The Body ◽

Structural Defects ◽

Multi Walled Carbon Nanotubes ◽

Walled Carbon Nanotubes

We systematically introduced defects onto the body of multi-walled carbon nanotubes through an acid treatment, and the evolution of these defects was examined by Raman spectroscopy using different excitation wavelengths. The D and D′ modes are most prominent and responsive to defect formation caused by acid treatment and exhibit dispersive behavior upon changing the excitation wavelengths as expected from the double resonance Raman (DRR) mechanism. Several weaker Raman resonances including D″ and L1 (L2) + D′ modes were also observed at the lower excitation wavelengths (633 and 785 nm). In addition, specific structural defects including the typical pentagon-heptagon structure (Stone–Wales defects) were identified by Raman spectroscopy. In a closer analysis we also observed Haeckelite structures, specifically Ag mode response in R5,7 and O5,6,7.

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STM/STS investigation of carbon nanotubes deposited on Bi2Te3 surface

Open Physics ◽

10.2478/s11534-009-0006-z ◽

2009 ◽

Vol 7 (2) ◽

Cited By ~ 2

Author(s):

Maciej Bazarnik ◽

Maciej Cegiel ◽

Piotr Biskupski ◽

Monika Jazdzewska ◽

SÅ‚awomir Mielcarek ◽

...

Keyword(s):

Carbon Nanotubes ◽

Electronic Structure ◽

Scanning Tunneling Microscopy ◽

Structural Defects ◽

Scanning Tunneling ◽

Narrow Gap ◽

Tunneling Microscopy ◽

Multi Walled Carbon Nanotubes ◽

Walled Carbon Nanotubes ◽

Walled Cnts

AbstractThis paper reports our scanning tunneling microscopy and spectroscopy (STM/STS) study of double-walled and multi-walled carbon nanotubes (CNTs) of different diameter deposited on Bi2Te3 (narrow gap semiconductor). The approximate diameter of the studied double-walled and multi-walled CNTs was 2 nm and 8 nm, respectively. Crystalline Bi2Te3 was used as a substrate to enhance the contrast between the CNTs and the substrate in the STS measurements performed to examine peculiarities of CNT morphology, such as junctions, ends or structural defects, in terms of their electronic structure.

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Synthesis of Dihydromyricetin Coated Multi-Walled Carbon Nanotubes (MWCNTs) and Antibacterial Activities

Journal of Nanoscience and Nanotechnology ◽

10.1166/jnn.2020.18002 ◽

2020 ◽

Vol 20 (10) ◽

pp. 6148-6154

Author(s):

Dan Liu ◽

Jun Luo ◽

Hao Wang ◽

Lijun Ding ◽

Xin-An Zeng

Keyword(s):

Carbon Nanotubes ◽

Pathogenic Bacteria ◽

Antimicrobial Property ◽

Antibacterial Activities ◽

Gravimetric Analysis ◽

Pristine Mwcnts ◽

Antimicrobial Material ◽

Ir Transmission ◽

Multi Walled Carbon Nanotubes ◽

Walled Carbon Nanotubes

The weak antimicrobial property of multi-walled carbon nanotubes (MWCNTs) hampers their use as an antimicrobial material. In the report, Dihydromyricetin (DMY) coated multi-walled carbon nanotubes (MWCNTs-DMY) were prepared with poly(ethylene glycol) (PEG1000) as a linker and evaluated for inactivating pathogenic bacteria. UV-visible spectra, FT-IR, transmission electron microscopy (TEM), and thermal gravimetric analysis (TGA) were used to characterize the MWCNTs-DMY. It has been shown that PEG and DMY are covalently attached to MWCNTs with excellent stability. Vibrio parahaemolyticus was employed as the target bacterium. Comparing with the raw and the functionalized MWCNTs (r-MWCNTs and f-MWCNTs), MWCNTs-DMY exhibited stronger antibacterial ability. The MWCNTs-DMY composite showed up to 10-fold higher antimicrobial property than pristine MWCNTs. The deposited DMY was suggested to play an important role in the bactericidal action of MWCNTs-DMY. The results of this study demonstrated that MWCNTs-DMY composite can serve as an effective and economical antimicrobial material.

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Study on Effect of Acid and Heat Treatments of Multi-Walled Carbon Nanotubes on Benzene Detection

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1103.105 ◽

2015 ◽

Vol 1103 ◽

pp. 105-111 ◽

Cited By ~ 1

Author(s):

Thanattha Chobsilp ◽

Winadda Wongwiriyapan ◽

Chaisak Issro ◽

Worawut Muangrat ◽

Weerawut Chaiwat ◽

...

Keyword(s):

Carbon Nanotubes ◽

Spin Coating ◽

Room Temperature ◽

Heat Treatments ◽

Benzene Vapor ◽

Pristine Mwcnts ◽

Heat Treated ◽

Multi Walled Carbon Nanotubes ◽

The Difference ◽

Walled Carbon Nanotubes

Effect of acid and heat treatments of multi-walled carbon nanotubes (MWCNTs) on benzene detection was investigated. For acid treatment, MWCNTs were treated by hydrochloric acid (HCl) for 1 h meanwhile other batches of MWCNTs were treated by heating under air ambient at 500°C for 1 h. Pristine, HCl-treated and heat-treated MWCNTs were separately coated with ethyl cellulose (EC) by spin-coating prior to fabrication of three different sensors named as EC/pristine MWCNTs, EC/HCl-MWCNTs and EC/heat-MWCNTs sensors, respectively. Each fabricated sensor was exposed to benzene vapor at room temperature for testing its sensing performance based on an increase in its electrical resistance which was sensitive to benzene vapor. Response of the sensors fabricated from EC/HCl-MWCNTs and EC/heat-MWCNTs were 3.66 and 1.92 times higher than that of EC/pristine MWCNTs, respectively. Sensitivity of all sensors would be attributed to swelling of EC, resulting in loosening of MWCNT network after benzene vapor exposure. In addition, the difference of sensing response of the EC/pristine MWCNTs when compared with those of EC/HCl-MWCNTs and EC/heat-MWCNTs would be ascribed to different crystallinity and functionalization of MWCNTs sidewalls, suggesting that acid and heat treatments of MWCNTs would be promising techniques for improvement of benzene detection.

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Inducing structural defects in multi-walled carbon nanotubes by biological oxidation

Materials Today Proceedings ◽

10.1016/j.matpr.2017.07.228 ◽

2017 ◽

Vol 4 (8) ◽

pp. 8788-8791

Author(s):

R.S. Chouhan ◽

V. Ozguz ◽

A. Qureshi ◽

J.H. Niazi

Keyword(s):

Carbon Nanotubes ◽

Structural Defects ◽

Biological Oxidation ◽

Multi Walled Carbon Nanotubes ◽

Walled Carbon Nanotubes

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Synthesis and Characterization of Functionalized Multi-Walled Carbon Nanotubes

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.307.377 ◽

2013 ◽

Vol 307 ◽

pp. 377-380 ◽

Cited By ~ 1

Author(s):

Shiuh Chuan Her ◽

Chun Yu Lai

Keyword(s):

Carbon Nanotubes ◽

Nitric Acid ◽

Volume Ratio ◽

Synthesis And Characterization ◽

Pristine Mwcnts ◽

Multi Walled Carbon Nanotubes ◽

Emission Microscopy ◽

Walled Carbon Nanotubes ◽

Functionalized Mwcnts

Multi-walled carbon nanotubes (MWCNT) were dispersed in a mixture of sulfuric and nitric acid with volume ratio of 3:1. Carboxylic acid-functionalized MWCNTS (MWCNT-COOH) were obtained by oxidation pristine MWCNTs via sonication in sulfuric-nitric acid. Epoxy-based nanocomposites reinforced with MWCNTs with and without functionalization were prepared. Chemical functionalization of MWCNTs by oxidation (MWCNT-COOH) was confirmed by FTIR. The properties of nanocomposites were characterized using scanning emission microscopy (SEM). Experimental results showed that functionalization of MWCNTs improved the dispersion of MWCNTs in epoxy matrix compared to those containing MWCNTs without functionalization.

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MWCNT Decorated Rich N-Doped Porous Carbon with Tunable Porosity for CO2 Capture

Molecules ◽

10.3390/molecules26113451 ◽

2021 ◽

Vol 26 (11) ◽

pp. 3451

Author(s):

Yuanjie Xiong ◽

Yuan Wang ◽

Housheng Jiang ◽

Shaojun Yuan

Keyword(s):

Co2 Capture ◽

Porous Carbon ◽

High Surface ◽

High Surface Area ◽

Chemical Oxidation ◽

Co2 Uptake ◽

In Situ Chemical Oxidation ◽

Pristine Mwcnts ◽

Multi Walled Carbon Nanotubes ◽

Walled Carbon Nanotubes

Designing of porous carbon system for CO2 uptake has attracted a plenty of interest due to the ever-increasing concerns about climate change and global warming. Herein, a novel N rich porous carbon is prepared by in-situ chemical oxidation polyaniline (PANI) on a surface of multi-walled carbon nanotubes (MWCNTs), and then activated with KOH. The porosity of such carbon materials can be tuned by rational introduction of MWCNTs, adjusting the amount of KOH, and controlling the pyrolysis temperature. The obtained M/P-0.1-600-2 adsorbent possesses a high surface area of 1017 m2 g−1 and a high N content of 3.11 at%. Such M/P-0.1-600-2 adsorbent delivers an enhanced CO2 capture capability of 2.63 mmol g−1 at 298.15 K and five bars, which is 14 times higher than that of pristine MWCNTs (0.18 mmol g−1). In addition, such M/P-0.1-600-2 adsorbent performs with a good stability, with almost no decay in a successive five adsorption-desorption cycles.

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