Hydrogen Gas Sensing Characteristics of Multiwalled Carbon Nanotubes Based Hybrid Composites

2015 ◽  
Vol 45 (1) ◽  
pp. 695-702 ◽  
Author(s):  
Shivani Dhall ◽  
Neena Jaggi
Keyword(s):  
Carbon Nanotubes ◽  
Multiwalled Carbon Nanotubes ◽  
Gas Sensing ◽  
Hybrid Composites ◽  
Hydrogen Gas ◽  
Multiwalled Carbon ◽  
Sensing Characteristics

scholarly journals Enhancement of Gas Sensing Characteristics of Multiwalled Carbon Nanotubes by CF4Plasma Treatment for SF6Decomposition Component Detection

2015 ◽  
Vol 2015 ◽  
pp. 1-9 ◽  
Author(s):  
Xiaoxing Zhang ◽  
Xiaoqing Wu ◽  
Bing Yang ◽  
Hanyan Xiao
Keyword(s):  
Carbon Nanotubes ◽  
Multiwalled Carbon Nanotubes ◽  
Recovery Time ◽  
Treatment Time ◽  
Gas Sensing ◽  
Gas Sensitivity ◽  
Multiwalled Carbon ◽  
State Evaluation ◽  
Response And Recovery ◽  
Sensing Characteristics

H2S and SO2are important gas components of decomposed SF6of partial discharge generated by insulation defects in gas-insulated switchgear (GIS). Therefore, H2S and SO2detection is important in the state evaluation and fault diagnosis of GIS. In this study, dielectric barrier discharge was used to generate CF4plasma and modify multiwalled carbon nanotubes (MWNTs). The nanotubes were plasma-treated at optimum discharge conditions under different treatment times (0.5, 1, 2, 5, 8, 10, and 12 min). Pristine and treated MWNTs were used as gas sensors to detect H2S and SO2. The effects of treatment time on gas sensitivity were analyzed. Results showed that the sensitivity, response, and recovery time of modified MWNTs to H2S were improved, but the recovery time of SO2was almost unchanged. At 10 min treatment time, the MWNTs showed good stability and reproducibility with better gas sensing properties compared with the other nanotubes.

Gas sensing properties of printed multiwalled carbon nanotubes using the field emission effect

2006 ◽  
Vol 433 (1-3) ◽  
pp. 105-109 ◽  
Author(s):  
Yang Doo Lee ◽  
Woo-Sung Cho ◽  
Seung-IL Moon ◽  
Yun-Hi Lee ◽  
Jai Kyeong Kim ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Multiwalled Carbon Nanotubes ◽  
Field Emission ◽  
Gas Sensing ◽  
Multiwalled Carbon ◽  
Sensing Properties ◽  
Gas Sensing Properties ◽  
Emission Effect

Enhanced vacuum sensing performance of multiwalled carbon nanotubes: role of defects and carboxyl functionalization

RSC Advances ◽  
2015 ◽  
Vol 5 (26) ◽  
pp. 20479-20485 ◽  
Author(s):  
K. Rajavel ◽  
M. Dinesh ◽  
R. Saranya ◽  
R. T. Rajendra Kumar
Keyword(s):  
Carbon Nanotubes ◽  
Multiwalled Carbon Nanotubes ◽  
Multiwalled Carbon ◽  
Surface Active ◽  
Sensing Characteristics ◽  
Carboxyl Functionalization ◽  
Sensing Performance

The presence of surface active carboxylic sites and the nature of the (ordered and defective) stacking of graphite layers in the nanotubes determined the vacuum sensing characteristics.

scholarly journals Sensing Properties of Multiwalled Carbon Nanotubes Grown in MW Plasma Torch: Electronic and Electrochemical Behavior, Gas Sensing, Field Emission, IR Absorption

Sensors ◽  
2015 ◽  
Vol 15 (2) ◽  
pp. 2644-2661 ◽  
Author(s):  
Petra Majzlíková ◽  
Jiří Sedláček ◽  
Jan Prášek ◽  
Jan Pekárek ◽  
Vojtěch Svatoš ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Multiwalled Carbon Nanotubes ◽  
Field Emission ◽  
Electrochemical Behavior ◽  
Plasma Torch ◽  
Gas Sensing ◽  
Ir Absorption ◽  
Multiwalled Carbon ◽  
Sensing Properties

Well-Crystallized SnO2 Nanocrystals Homogeneously and Intimately Coated on Multiwalled Carbon Nanotubes by a Simple Surfactant-Free Hydrothermal Method

2011 ◽  
Vol 686 ◽  
pp. 474-481 ◽  
Author(s):  
Y.Q. Guo ◽  
Rui Qin Tan ◽  
Z.Y. Cao ◽  
Wei Jie Song
Keyword(s):  
Carbon Nanotubes ◽  
Multiwalled Carbon Nanotubes ◽  
Photoelectron Spectroscopy ◽  
Gas Sensing ◽  
Hydrothermal Reaction ◽  
Ph Value ◽  
Ethanol Solution ◽  
Multiwalled Carbon ◽  
X Ray ◽  
In Situ Deposition

A simple approach to the in situ deposition of well-crystallized SnO2nanocrystals on the surface of multiwalled carbon nanotubes (MWCNTs) in the ethanol solution system of SnCl2 was presented in this paper. The well-crystallized SnO2nanocrystals with small and uniform crystal size (4~5 nm) can be tightly and homogenously coated on the outside surface of the MWCNTs entirely. The prepared nanocomposites were characterized by X-ray diffraction, transmission electron microscopy, X-ray photoelectron spectroscopy, and nitrogen BET measurements. It is found that the hydrothermal reaction plays an important role for the crystal growth of the SnO2nanocrystals on the surface of MWCNTs, and the crystallinity of the SnO2nanocrystals can be controlled by varying the pH value or the hydrothermal reaction time. It is found that a unique structure of leaf-like SnO2nanosheets hanging on the MWCNTs was obtained when using water as the solvent of SnCl2instead of ethanol. The gas sensing performance of the SnO2/MWCNTs nanocomposites was also investigated.

scholarly journals Tunable Chemical Grafting of Three-Dimensional Poly (3, 4-ethylenedioxythiophene)/Poly (4-styrenesulfonate)-Multiwalled Carbon Nanotubes Composite with Faster Charge-Carrier Transport for Enhanced Gas Sensing Performance

Sensors ◽  
2020 ◽  
Vol 20 (9) ◽  
pp. 2470
Author(s):  
Hyojae Kim ◽  
Yeongseok Jang ◽  
Gyeong Won Lee ◽  
Seung Yun Yang ◽  
Jinmu Jung ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Charge Carrier ◽  
Multiwalled Carbon Nanotubes ◽  
Carrier Transport ◽  
Gas Sensing ◽  
Three Dimensional ◽  
Charge Carrier Transport ◽  
Multiwalled Carbon ◽  
Gas Molecules ◽  
Sensing Performance

The three-dimensional volumetric application of conductive poly (3,4-ethylenedioxythiophene)/poly (4-styrenesulfonate) (PEDOT:PSS) to multiwalled carbon nanotubes (MWCNTs) has not been widely reported. In this study, the applicability of the 3D PEDOT:PSS-MWCNT composite for a gas sensor was investigated with different PEDOT:PSS concentrations. The gas-sensing performance of the 3D PEDOT:PSS-MWCNT composites was investigated using ethanol and carbon monoxide (CO) gas. Overall, in comparison with the pristine MWCNTs, as the PEDOT:PSS concentration increased, the 3D PEDOT:PSS-MWCNT composites exhibited increased conductivity and enhanced gas sensing performances (fast response and recovery times) to both ethanol and CO gases. Importantly, although the PEDOT:PSS coating layer reduced the number of sites for the adsorption and desorption of gas molecules, the charge-carrier transport between the gas molecules and MWCNTs was significantly enhanced. Thus, PEDOT:PSS can be chemically grafted to MWCNTs to enhance the connectivity and conductivity of a 3D network, leading to possible applications in gas sensors.

Viscoelastic and mechanical properties of CNT-reinforced polymer-based hybrid composite materials using hygrothermal creep

2021 ◽  
Vol 29 (9_suppl) ◽  
pp. S1386-S1402
Author(s):  
S Srikant Patnaik ◽  
Tarapada Roy
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
Composite Materials ◽  
Multiwalled Carbon Nanotubes ◽  
Hybrid Composite ◽  
Viscoelastic Properties ◽  
Hybrid Composites ◽  
Multiwalled Carbon ◽  
Ultrasonic Probe ◽  
Reinforced Polymer

In the present work, a combination of experimental and numerical procedure is proposed to study the effects of different hygrothermal conditions on the creep strain, viscoelastic properties of nanocomposites, and mechanical properties of such nanocomposite-based carbon fiber–reinforced polymer (CFRP) hybrid composite materials. Ultrasonic probe sonicator is used to randomly disperse the multiwalled carbon nanotubes into an epoxy to minimize agglomerations. Dynamic mechanical analysis is employed to conduct the creep tests under different hygrothermal conditions of such nanocomposite samples. The Findley power law is used to obtain the long-term creep behavior of nanocomposite materials. Prony series is used to determine the viscoelastic properties of nanocomposite material in the frequency domain. Coefficient of moisture expansion (CME) is independent of moisture concentration; thus, CME of the nanocomposite is also determined. Strength of materials and Saravanos–Chamis micromechanics (SCM) have also been utilized to obtain the mechanical properties of such hybrid composite materials under different hygrothermal conditions. It has been found that the inclusion of multiwalled carbon nanotubes in the nanocomposite and hybrid composites improves storage modulus and loss factor (i.e., tan δ) compared to the conventional CFRP-based composite materials under hygrothermal conditions.

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