Effect of different acid oxidation on morphology, dispersion and optical band-gap of multi-walled carbon nanotubes

2016 ◽  
Vol 24 (5) ◽  
pp. 332-338 ◽  
Author(s):  
Anup Kumar Sharma ◽  
Ritu Sharma ◽  
Ramesh Prajapati ◽  
Santosh Chaudhary
Keyword(s):  
Carbon Nanotubes ◽  
Band Gap ◽  
Optical Band Gap ◽  
Acid Oxidation ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

scholarly journals Self-Photoluminescence of Unzipped Multi-Walled Carbon Nanotubes

Nanomaterials ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 1632
Author(s):  
Mengyao Chen ◽  
Xiaohua Qi ◽  
Wenna Zhang ◽  
Na Yang ◽  
Di Yang ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Band Gap ◽  
Hummers Method ◽  
Light Region ◽  
Munk Function ◽  
Pristine Cnts ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes ◽  
Modified Hummers Method ◽  
Etching Effect

Unzipping of carbon nanotubes (CNTs) has been widely explored to obtain new nanocarbon structures with promising properties. In this work, we report that unzipping of CNTs according to the well-established modified Hummers method produces unzipped CNTs (uCNTs) that exhibit self-photoluminescence that depends on the diameter of pristine CNTs. The uCNTs were characterized using FTIR spectroscopy, XRD, XPS, and Raman spectroscopy indicating that unzipping is accompanied by the introduction of defects and oxygen-containing functional groups. The morphology of CNTs and uCNTs was determined by TEM showing longitude unzipping of CNTs. Our study shows that increasing the diameter of pristine CNTs results in decreasing the edge etching effect and decreasing the functionality of uCNTs. Based on the UV-Vis spectra, the band gap of uCNTs was calculated using the Kubelka–Munk function. The band gap of uCNTs increased with decreasing diameter of pristine CNTs. The uCNTs exhibited photoluminescence with a good emission in the visible light region. The uCNTs with the largest band gap and the highest oxygen content had the strongest fluorescence intensity. Moreover, different metal ions produced different degrees of fluorescence quenching for uCNT-15, which verified the self-photoluminescence of uCNTs.

Development of Pd and Pd–Co catalysts supported on multi-walled carbon nanotubes for formic acid oxidation

2010 ◽  
Vol 195 (2) ◽  
pp. 461-465 ◽  
Author(s):  
D. Morales-Acosta ◽  
J. Ledesma-Garcia ◽  
Luis A. Godinez ◽  
H.G. Rodríguez ◽  
L. Álvarez-Contreras ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Formic Acid ◽  
Formic Acid Oxidation ◽  
Acid Oxidation ◽  
Co Catalysts ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

Influence of Surface Characteristics on the Dispersion of Modified Multi-Walled Carbon Nanotubes

2011 ◽  
Vol 236-238 ◽  
pp. 1832-1835 ◽  
Author(s):  
Yan Xuan Ma ◽  
Yu Dong Zheng ◽  
Jian Wu ◽  
Jue Tan ◽  
Wei Li ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Surface Characteristics ◽  
Vinyl Pyrrolidone ◽  
Acid Oxidation ◽  
Sodium Dodecylbenzene Sulfonate ◽  
Reactive Groups ◽  
Surface Contact Angle ◽  
Multi Walled Carbon Nanotubes ◽  
Poly Vinyl Pyrrolidone ◽  
Walled Carbon Nanotubes

In order to improve the dispersion of multi-walled carbon nanotubes (MWCNTs), MWCNTs were physically modified by the surfactant of Poly (vinyl pyrrolidone) (PVP), cetyl trimethylammonium bromide (CTAB) and sodium dodecylbenzene sulfonate (SDBS), and were chemically treated by the acid oxidation. Measuring the zeta potential of the dispersions of modified MWCNTs and surface contact angle of modified MWCNT powders, influence of acting forces on the dispersions of modified MWCNTs was analyzed. The balance of electrostatic repulsion and van der Waals forces determines the stabilization of aqueous modified MWCNT dispersions. The sufficient reactive groups, ions and long molecular chains play important roles for such balance.

scholarly journals Functionalization of single and multi-walled carbon nanotubes by chemical treatment

2019 ◽  
Vol 16 (39) ◽  
pp. 55-63
Author(s):  
Akram Sh. Ahmed
Keyword(s):  
Carbon Nanotubes ◽  
Acid Treatment ◽  
Single Walled Carbon Nanotubes ◽  
Deionized Water ◽  
Acid Oxidation ◽  
Ultrasonic Technique ◽  
Experimental Conditions ◽  
Multi Walled Carbon Nanotubes ◽  
Swcnts And Mwcnts ◽  
Walled Carbon Nanotubes

In this work we experimentally investigated SWCNTs and MWCNTs to increase their thermal conductivity and electrically functionalization process using different reagents ((nitric acid, HNO3 followed by acid treatment with H2SO4), then washed with deionized water (DW) and then treated with H2O2 via ultrasonic technique. Then repeated the steps with MWCNTs and compare their results in an effort to improve experimental conditions that efficiently differentiate the surface of the single walled carbon nanotubes (SWCNTs) and multi walled carbon nanotubesi(MWCNTs) that less nanotubes destroy and to enhance the properties of them and also to reduce aggregation in liquid. the results were prove by XRD, and infrared spectroscopy (FTIR). The FTIR spectrum shows the presence of carboxylic group after treatment with (acid oxidation and H2O2) and refers to Functionalization (SWCNTs) and (MWCNTs) on the surface wall microscopic images show surface adjustment on SWCNTs and ((MWCNTs)) structure after any treatment. AT last, a fully of SWCNTs and MWCNTSIwere obtained successfully accomplished with the reduction of the collapsed structure.

scholarly journals The effect of nitric acid oxidation parameters to the structural and electrochemical behavior of multi-walled carbon nanotubes

2018 ◽  
Author(s):  
Shahidah Arina Shamsuddin ◽  
Mohd Nazree Derman ◽  
Jasni Mohamed Ismail ◽  
Nur Hamidah Abdul Halim ◽  
Uda Hashim ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Nitric Acid ◽  
Electrochemical Behavior ◽  
Acid Oxidation ◽  
Multi Walled Carbon Nanotubes ◽  
Nitric Acid Oxidation ◽  
Walled Carbon Nanotubes ◽  
Oxidation Parameters

The design and fabrication of nanoengineered platinum needles with laser welded carbon nanotubes (CNTs) for the electrochemical biosensing of cancer lymph nodes

2021 ◽  
Author(s):  
Ashkan Zandi ◽  
Zahra Davari Sh. ◽  
Fatemeh Shojaeian ◽  
S. M. Sadegh Mousavi-kiasary ◽  
Fereshteh Abbasvandi ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Fatty Acid ◽  
Lymph Nodes ◽  
Laser Irradiation ◽  
Fatty Acid Oxidation ◽  
Acid Oxidation ◽  
Electrochemical Biosensing ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

A new biosensor for detecting cancer lymph nodes was developed based on the electrochemical tracing of fatty acid oxidation. The sensor needles were decorated with superhydrophobic multi-walled carbon nanotubes using laser irradiation nano-welding.

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