Preparation of Cu2O (Cu)/MWCNTs Composite Particles and Their Gas Sensor Properties

2012 ◽  
Vol 602-604 ◽  
pp. 57-61 ◽  
Author(s):  
Zhuan Fang Zhang ◽  
Guang Ming Yin ◽  
Ying Yang
Keyword(s):  
Gas Sensor ◽  
Cuprous Oxide ◽  
Multiwall Carbon Nanotubes ◽  
Sensor Response ◽  
Composite Particles ◽  
X Ray Diffraction ◽  
Sensor Properties ◽  
Ft Ir ◽  
Multiwall Carbon ◽  
Nox Gas Sensor

Multiwall carbon nanotubes (MWCNTs) were embedded in cuprous oxide and copper to give ternary (Cu2O (Cu))/MWCNTs composites, Cu (CH3COO) 2•H2O and the treated MWCNTs were used as source precursor for producing composite particles by polyol method. Ethylene glycol (EG) was used as solvent and reducing agent. The products were characterized through scanning electron microscope (SEM), X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FT-IR). The results have shown that the MWCNTs are embedded into the cuprous oxide and copper spheres homogeneously. At room temperature, the composite materials to the NOx have excellent gas sensitive response contrast to NH3, CO, H2. The concentration of NOx is 700 ppm, the maximum value of Cu2O/MWCNTs vs. the NOx gas sensor response sensitivity is 20.3 %, and gas sensor response has certain selectivity.

Synthesis and characterization of ZnO-functionalized multiwall carbon nanotubes nanocomposite as NOx gas sensor

2020 ◽  
Vol 46 (8) ◽  
pp. 3911-3927
Author(s):  
Pooya Gholami ◽  
Alimorad Rashidi ◽  
Masoud Khaleghi Abbasabadi ◽  
Mahnaz Pourkhalil ◽  
Mansour Jahangiri ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Gas Sensor ◽  
Multiwall Carbon Nanotubes ◽  
Synthesis And Characterization ◽  
Multiwall Carbon ◽  
Nox Gas Sensor ◽  
Functionalized Multiwall Carbon Nanotubes

scholarly journals Structural and Morphological Studies of V2O5/MWCNTs and ZrO2/MWCNTs Composites as Photocatalysts

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Sajid Iqbal ◽  
Tanveer Hussain Bokhari ◽  
Shoomaila Latif ◽  
Muhammad Imran ◽  
Ayesha Javaid ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Multiwall Carbon Nanotubes ◽  
X Ray Diffraction ◽  
X Ray ◽  
Morphological Studies ◽  
Photocatalytic Application ◽  
Photocatalytic Activities ◽  
Ft Ir ◽  
Multiwall Carbon ◽  
Scanning Electron

The present study outlines the synthesis of transition metal oxide- (TMO-) multiwall carbon nanotubes- (MWCNTs-) based composites for photocatalytic application. MWCNTs were functionalized/purified by treating with H2SO4 and HNO3 to improve their dispersion in water. The TMOs (ZrO2, V2O5) were decorated on MWCNTs by the hydrothermal method to yield V2O5/MWCNTs and ZrO2/MWCNTs composites. Subsequently, these composites were characterized for their structural/morphological studies by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), and scanning electron microscopy (SEM). Photocatalytic activities of TMO/MWCNTs composites were investigated by degradation phenomenon of methylene blue (MB) dye in aqueous solution. It was observed that the prepared composites best performed in the presence of H2O2 under ultraviolet irradiation. The maximum observed degradation efficiencies for ZrO2/MWCNTs and V2O5/MWCNTs were 49% and 96%, respectively.

scholarly journals Free and partially encapsulated manganese ferrite nanoparticles in multiwall carbon nanotubes

2020 ◽  
Vol 11 ◽  
pp. 1891-1904
Author(s):  
Saja Al-Khabouri ◽  
Salim Al-Harthi ◽  
Toru Maekawa ◽  
Mohamed E Elzain ◽  
Ashraf Al-Hinai ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Multiwall Carbon Nanotubes ◽  
Ferrite Nanoparticles ◽  
Photoemission Spectroscopy ◽  
Manganese Ferrite ◽  
X Ray Diffraction ◽  
Band Emission ◽  
Structure Surface ◽  
Diffraction Peaks ◽  
Multiwall Carbon

Free and partially encapsulated manganese ferrite (MnFe2O4) nanoparticles are synthesized and characterized regarding structure, surface, and electronic and magnetic properties. The preparation method of partially encapsulated manganese ferrite enables the formation of a hybrid nanoparticle/tube system, which exhibits properties of manganese ferrite nanoparticles inside and attached to the external surface of the tubes. The effect of having manganese ferrite nanoparticles inside the tubes is observed as a shift in the X-ray diffraction peaks and as an increase in stress, hyperfine field, and coercivity when compared to free manganese ferrite nanoparticles. On the other hand, a strong charge transfer from the multiwall carbon nanotubes is attributed to the attachment of manganese ferrite nanoparticles outside the tubes, which is detected by a significant decrease in the σ band emission of the ultraviolet photoemission spectroscopy signal. This is followed by an increase in the density of states at the Fermi level of the attached manganese ferrite nanoparticles in comparison to free manganese ferrite nanoparticles, which leads to an enhancement of the metallic properties.

scholarly journals Gas sensor properties of Ag- and Pd-decorated SnO micro-disks to NO2, H2 and CO: Catalyst enhanced sensor response and selectivity

2017 ◽  
Vol 239 ◽  
pp. 253-261 ◽  
Author(s):  
Martin S. Barbosa ◽  
Pedro H. Suman ◽  
Jae J. Kim ◽  
Harry L. Tuller ◽  
José A. Varela ◽  
...  
Keyword(s):  
Gas Sensor ◽  
Sensor Response ◽  
Co Catalyst ◽  
Sensor Properties

Stacking Faults in SiC Nanowires

2008 ◽  
Vol 8 (7) ◽  
pp. 3504-3510 ◽  
Author(s):  
K. L. Wallis ◽  
M. Wieligor ◽  
T. W. Zerda ◽  
S. Stelmakh ◽  
S. Gierlotka ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Stacking Faults ◽  
Multiwall Carbon Nanotubes ◽  
Structural Defects ◽  
X Ray Diffraction ◽  
Ir Spectrometry ◽  
X Ray ◽  
Sic Nanowires ◽  
Transmission Electron ◽  
Multiwall Carbon

SiC nanowires were obtained by a reaction between vapor silicon and multiwall carbon nanotubes, CNT, in vacuum at 1200 °C. Raman and IR spectrometry, X-ray diffraction and high resolution transmission electron microscopy, HRTEM, were used to characterize properties of SiC nanowires. Morphology and chemical composition of the nanowires was similar for all samples, but concentration of structural defects varied and depended on the origin of CNT. Stacking faults were characterized by HRTEM and Raman spectroscopy, and both techniques provided complementary results. Raman microscopy allowed studying structural defects inside individual nanowires. A thin layer of amorphous silicon carbide was detected on the surface of nanowires.

Effect of Urea on the Shape and Structure of Carbon Nanotubes

2018 ◽  
Vol 73 (2) ◽  
pp. 113-120 ◽  
Author(s):  
M. R. Elamin ◽  
Babiker Y. Abdulkhair ◽  
Kamal K. Taha
Keyword(s):  
Electron Microscopy ◽  
Carbon Nanotubes ◽  
Chemical Vapour ◽  
Multiwall Carbon Nanotubes ◽  
Nitrogen Adsorption ◽  
X Ray Diffraction ◽  
Transmission Electron ◽  
Adsorption Analysis ◽  
Bet Analysis ◽  
Multiwall Carbon

AbstractCoiled multiwall carbon nanotubes (MWCNTs) were prepared on Fe, Co, and Ni metal oxides supported on α-Al2O3 using urea as fuel and catalyst surface modifying agent by catalytic chemical vapour deposition (CCVD). The shape of the nanotubes was influenced by the addition of urea, where coiled and uncoiled tubes were obtained in the presence and absence of urea, respectively. The MWCNTs were characterized using scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), and nitrogen adsorption analysis. The coiling/uncoiling of the nanotubes was visualized from the SEM and TEM images of the prepared specimens. The XRD data showed the characteristic peaks of the nanotubes. BET analysis of the coiled tubes revealed 85.57 m2 g−1 surface area with a pore diameter 102.2–110.8 Å. A mechanism for the nanotubes coiling is suggested.

Thermal and Flame Retardant Properties of MWNT Reinforced Conductive PAN Film

2014 ◽  
Vol 924 ◽  
pp. 253-259
Author(s):  
Zhuo Chen ◽  
Xian Dong ◽  
Wei Zhao ◽  
Ke Jia Liu ◽  
Ji Ping Liu
Keyword(s):  
Carbon Nanotubes ◽  
Thermal Stability ◽  
Electrical Conductivity ◽  
Composite Film ◽  
Multiwall Carbon Nanotubes ◽  
Ultrasonic Dispersion ◽  
Vacuum Casting ◽  
Ft Ir ◽  
Flame Retardant Properties ◽  
Multiwall Carbon

Conductive polyacrylonitrile film reinforced by multiwall carbon nanotubes was prepared via ultrasonic dispersion and vacuum casting. The structure of MWNT/PAN composite film was characterized by WAXD and FT-IR. The LOI of the blend was enhanced from 18.1 % to 24.5 % and TGA show better thermal stability. MWNT composite at 10 wt% MWNT loading showed an electrical conductivity of 10-2S/cm.

scholarly journals MICROPOWER GAS SENSOR BASED ON THE COMPOSITION TUNGSTEN OXIDE AND MULTIWALL CARBON NANOTUBES

2016 ◽  
Vol 7 (1) ◽  
pp. 41-49 ◽  
Author(s):  
Yu. S. Haiduk ◽  
O. G. Reutskaya ◽  
A. A. Savitsky ◽  
I. A. Taratyn
Keyword(s):  
Carbon Nanotubes ◽  
Tungsten Oxide ◽  
Gas Sensor ◽  
Multiwall Carbon Nanotubes ◽  
Multiwall Carbon
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