scholarly journals Study of the Interaction of an Iron Phthalocyanine Complex over Surface Modified Carbon Nanotubes

Materials ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4067
Author(s):  
María Pérez-Cadenas ◽  
Esther Asedegbega-Nieto ◽  
Jonathan Carter ◽  
James A. Anderson ◽  
Inmaculada Rodríguez-Ramos ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Materials ◽  
Chemical Vapor ◽  
Iron Phthalocyanine ◽  
Surface Functional Groups ◽  
Cvd Method ◽  
Basic Solutions ◽  
Fe Complex ◽  
Surface Modified ◽  
Modified Carbon Nanotubes

Carbon nanotubes (CNT) were prepared by a modified chemical vapor deposition (CVD) method. The synthesized carbon materials were treated with acidic and basic solutions in order to introduce certain surface functional groups, mainly containing oxygen (OCNT) or amine (ACNT) species. These modified CNTs (OCNT and ACNT) as well as the originally prepared CNT were reacted with a non-ionic Fe complex, Iron (II) Phthalocyanine, and three composites were obtained. The amount of metal complex introduced in each case and the interaction between the complex and the CNT materials were studied with the aid of various characterization techniques such as TGA, XRD, and XPS. The results obtained in these experiments all indicated that the interaction between the complex and the CNT was greatly affected by the functionalization of the latter.

Surface-Modified Carbon Nanotubes for Enhanced Ammonia Gas Sensitivity at Room Temperature

2019 ◽  
Vol 19 (11) ◽  
pp. 7447-7451 ◽  
Author(s):  
Truong Duong Vu ◽  
Tu Nguyen Cong ◽  
Bac Luong Huu ◽  
Chien Nguyen Duc ◽  
Lam Nguyen Huu
Keyword(s):  
Carbon Nanotubes ◽  
Noble Metals ◽  
Room Temperature ◽  
Chemical Vapor ◽  
Electron Beam Evaporation ◽  
Metallic Surface ◽  
Gas Sensitivity ◽  
Ammonia Gas ◽  
Surface Modified ◽  
Modified Carbon Nanotubes

By electron beam evaporation, noble metals (Au, Co, Pt, and Ag) with 2 and 4 nm nominal thicknesses were coated onto multi-walled carbon nanotube layers. The metals were in the form of nanoparticles mounted onto the side walls of carbon nanotubes (CNTs) to create a metal/CNT junction. The CNTs were directly grown on patterned Pt-electrode alumina substrates through chemical vapor deposition to produce a resistivity-based ammonia gas sensor. The metallic surface-modified CNT-based sensors were found sensitive to NH3 gas at room temperature. Compared with pristine CNT sensor, the response of Au/CNTs sensor increased slightly, whereas the responses of the Pt/CNTs, Co/CNTs, and Ag/CNTs increased by two, three, and more than four times, respectively.

CARBON NANOTUBES AND NANO-Ce–Zr OXIDES SUPPORTED H3PW12O40 FOR EFFECTIVE ADSORPTION–DECOMPOSITION OF NOx

2012 ◽  
Vol 11 (06) ◽  
pp. 1240030
Author(s):  
LIN CHENG ◽  
RUI WANG
Keyword(s):  
Carbon Nanotubes ◽  
Ethyl Alcohol ◽  
Mixed Oxides ◽  
Impregnation Method ◽  
Adsorption Efficiency ◽  
Grinding Method ◽  
Water As Solvent ◽  
Surface Modified ◽  
Modified Carbon Nanotubes ◽  
Peak Value

Surface-modified carbon nanotubes (CNTs) and nano- Ce–Zr mixed oxides (CZO) were prepared and employed initially as supports of H3PW12O40 (HPW) for NO x adsorption–decomposition. Both CNTs and nano-CZO are favorable supports for HPW. After loading with HPW, the NO x adsorption efficiency increases, especially for HPW/CZO in which the highest adsorption efficiency can achieve 98% at the HPW loading of 70%, much higher than that of single HPW. NO x adsorption efficiency can be influenced considerably by catalyst preparing conditions, in particularly, ethyl alcohol is superior to water as solvent for HPW loading onto CNTs; the –OH containing CNTs shows better promotion effect on the adsorption of NO x than that containing –COOH when using absolute ethyl alcohol as solvent; mechanical grinding method is superior to incipient impregnation method in loading HPW onto the support of CZO. For both catalysts of HPW/CNTs and HPW/CZO, with the increase of HPW loading, the NO x adsorption efficiency tends to reach a peak value before dropping down. Heated from 150°C to 450°C at a rate of 50°C/min, the adsorbed NO was found to decompose into N2 , O2 and N2O , and yields of N2 being 21.8% and 27.3%, respectively for HPW/CNTs and HPW/CZO were obtained.

Synthesis of Carbon Nanotubes from Polycyclic Compounds by CVD Method

2006 ◽  
Vol 320 ◽  
pp. 163-166 ◽  
Author(s):  
Koji Yamada ◽  
Kentaro Abe ◽  
Masafumi Mikami ◽  
Morihiro Saito ◽  
Jun Kuwano
Keyword(s):  
Carbon Nanotubes ◽  
Chemical Vapor Deposition ◽  
Vapor Deposition ◽  
Quartz Substrate ◽  
Chemical Vapor ◽  
Polycyclic Compounds ◽  
Cvd Method ◽  
Multi Walled Carbon Nanotubes ◽  
Synthesis Of Carbon Nanotubes ◽  
Walled Carbon Nanotubes

Multi-walled carbon nanotubes (MWCNTs) were synthesized from camphor by a chemical vapor deposition (CVD) method in a range of 750-900. The catalyst was fed in three ways: (a) a sputtered Fe-film on a quartz substrate (b) vaporized ferrocene in an Ar flow; (c) both of (a) and (b). In the case (c), highly pure, dense and aligned MWCNT arrays formed on the quartz substrate at 850, whereas nonaligned MWCNTs formed in the cases (a) and (b).

Synthysis of S Doped Y-Junction Carbon Nanotubes by CVD Method

2011 ◽  
Vol 183-185 ◽  
pp. 1731-1735 ◽  
Author(s):  
Xia Yuan ◽  
Xiao Juan Wu ◽  
Yu Liang An ◽  
Qing Yi Hou
Keyword(s):  
Carbon Nanotubes ◽  
Chemical Vapor Deposition ◽  
Carbon Disulfide ◽  
Growth Mechanism ◽  
Vapor Deposition ◽  
Chemical Vapor ◽  
Processing Parameters ◽  
Structure And Morphology ◽  
Cvd Method

The sulfur-doped Y-junction carbon nanotubes (S-YCNTs) were prepared by chemical vapor deposition of carbon disulfide using Fe as catalyst. Sulfur can be incorporated into the nanotubes with an identifiable amount, forming sulfur-doped carbon nanotubes. The growth of asymmetrical Y-branches in the nanotubes may be related to the presence of sulfur from precursor. The structure and morphology of S-YCNTs can be controlled by processing parameters. The S-YCNTs were characterized by SEM, TEM, EDX, and XPS, respectively. The growth mechanism of S-YCNTs was discussed in terms of the role of sulfur from carbon feedstock.

EFFECT OF REACTION TEMPERATURE ON THE PRODUCTION OF CARBON NANOTUBES

NANO ◽  
2006 ◽  
Vol 01 (03) ◽  
pp. 251-257 ◽  
Author(s):  
A. A. MUATAZ ◽  
F. AHMADUN ◽  
C. GUAN ◽  
E. MAHDI ◽  
A. RINALDI
Keyword(s):  
Carbon Nanotubes ◽  
Reaction Temperature ◽  
Vapor Deposition ◽  
Chemical Vapor ◽  
High Yield ◽  
Cvd Method ◽  
Hydrogenation Reactions ◽  
Surface Decomposition ◽  
Yield And Purity ◽  
Catalyst Chemical Vapor Deposition

A floating catalyst chemical vapor deposition (FC-CVD) method was designed and fabricated to produce high quality and quantity carbon nanotubes. The reaction temperature was optimized to produce high yield and purity of the carbon nanotubes. The reaction temperatures were varied from 500–850°C. The result shows that carbon nanotubes were observed from 600°C to 850°C with maximum numbers and high purity at 850°C. The diameter range of CNTs varied from 2 to 55 nm. The results of the present investigation suggest that the observed changes in catalytic activity and selectivity accompanying an increase in temperature are probably due to major alterations in the distribution of atoms at the metal/gas interface. Thermodynamically, higher temperatures favor the surface decomposition of hydrocarbon rather than the hydrogenation reactions.

Shape-Memory Nanocomposite Elastomers Filled with Carbon Nanomaterials

2016 ◽  
Vol 100 ◽  
pp. 5-10
Author(s):  
Giuseppe Cesare Lama ◽  
Gennaro Gentile ◽  
Pierfrancesco Cerruti ◽  
Marino Lavorgna ◽  
Veronica Ambrogi ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Shape Memory ◽  
Carbon Nanomaterials ◽  
Thermomechanical Analysis ◽  
Scanning Calorimetry ◽  
Multiwalled Carbon ◽  
Transmission Electron ◽  
Dispersion Test ◽  
Surface Modified ◽  
Modified Carbon Nanotubes

In this contribution, the preparation and characterization of new shape-memory epoxy based nanocomposites filled with modified multiwalled carbon nanotubes are reported. The study has been focused on the optimization of the preparation methodology and on the evaluation of the effect of different contents of surface modified carbon nanotubes on the properties and the microstructure of the obtained materials. In particular, dispersion test, infrared spectroscopy, thermogravimetric analysis and bright field transmission electron microscopy have been carried out to analyze the modified filler. Moreover, the obtained nanocomposites have been characterized by morphological analysis, differential scanning calorimetry, thermomechanical analysis and X-ray analysis in order to clarify the effect of the nanofiller on the structure and shape memory properties of the materials.

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