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.

Selective Methanol Detection of Pyrolysis Grown Multiwalled Carbon Nanotubes

2018 ◽  
Vol 24 (8) ◽  
pp. 5645-5650
Author(s):  
Krishnamoorthy Rajavel ◽  
Ramasamy Thangavelu Rajendra Kumar
Keyword(s):  
Carbon Nanotubes ◽  
Multiwalled Carbon Nanotubes ◽  
Defect Density ◽  
Random Network ◽  
Structural Defects ◽  
Ambient Conditions ◽  
Gas Sensitivity ◽  
Multiwalled Carbon ◽  
Graphitization Degree ◽  
Response And Recovery

Interest in vast response to external gas molecules by carbon nanotubes (CNTs) at ambient conditions potential for nanotubes based gas sensors. In this report, we synthesized carbon nanotubes using simple pyrolytic assisted growth process by varying temperatures (770, 870 and 970 °C). The pyrolysis grown multiwalled carbon nanotubes (MWCNTs) are found to be in well-ordered crystalline structure with significant higher graphitization degree and lower defect density resulting from structural and morphological analysis (TEM, Raman, FTIR and TG/DTA). The calculated ID/IG ratio reflects on decrease in structural defects of nanotubes on increasing the growth temperature from 770 to 970 °C. Two electrode based random network of CNTs sensor device are fabricated and applied for volatile organic compounds (Ethanol, Methanol, Acetone and Propan-2-ol) sensing. MWCNTs grown at 770 °C and 870 °C shows nearly equal response for Ethanol, Methanol, Acetone and Propan-2-ol gases. However, MWCNTs grown at 970 °C show selective sensing of methanol at room temperature. The calculated gas methanol gas sensitivity is about 35% with higher response and recovery time about ~6 and 10 sec respectively. This selective response for tested gases could be interesting for fabrication of CNTs based methanol sensors.

A facile method for preparation of porous nitrogen-doped Ti Ti3C2Tx MXene for highly responsive acetone detection at high temperature

2021 ◽  
pp. 2151043
Author(s):  
Zijing Wang ◽  
Fen Wang ◽  
Angga Hermawan ◽  
Jianfeng Zhu ◽  
Shu Yin
Keyword(s):  
Gas Sensor ◽  
Recovery Time ◽  
Gas Sensing ◽  
Three Dimensional ◽  
Gas Sensitivity ◽  
Nitrogen Doped ◽  
Dimensional Network ◽  
Potential Applications ◽  
Response And Recovery ◽  
Acetone Detection

Porous nitrogen-doped Ti3C2T[Formula: see text] MXene (N-TCT) with a three-dimensional network structure is synthesized via a simple sacrifice template method and then utilized as an acetone gas sensor. By introducing nitrogen atoms as heteroatoms into Ti3C2T[Formula: see text] nanosheets, some defects generate around the doped nitrogen atoms, which can greatly improve the surface hydrophilicity and adsorption capacity of Ti3C2T[Formula: see text] Mxene nanosheets. It resulted in the enhanced gas sensitivity, achieving a response value of about 36 ([Formula: see text]/[Formula: see text] × 100%) and excellent recovery time (9s) at 150[Formula: see text]C. Compared with the pure Ti3C2T[Formula: see text]-based gas sensor (381/92s), the response and recovery time are both obviously improved, and the response value increased by 3.5 times. The gas-sensing mechanism of the porous N-TCT is also discussed in detail. Based on the excellent gas sensitivity of porous N-TCT for highly responsive acetone detection at high temperatures, the strategy of nitrogen-doped two-dimensional nanomaterials can be extended to other nanomaterials to realize their potential applications.

Preparation and Property of Lanthanum Ferrite Formaldehyde Gas Sensor Modified by Carbon Nanotubes and Silver

2013 ◽  
Vol 320 ◽  
pp. 554-557 ◽  
Author(s):  
Yu Min Zhang ◽  
Yu Tao Lin ◽  
Jin Zhang ◽  
Zhong Qi Zhu ◽  
Qiang Liu ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Chemical Synthesis ◽  
Recovery Time ◽  
Gas Sensing ◽  
Operating Temperature ◽  
Sol Gel ◽  
Lanthanum Ferrite ◽  
Gas Sensing Properties ◽  
Response And Recovery ◽  
Sensitive Property

Our previous study revealed that the gas sensitive property of Silver-modified Lanthanum Ferrite (Ag-LaFeO3) is well, but the operating temperature is still high and the sensitivity also needs to be improved. This work based on our previous study. Ag-LaFeO3 was further modified by the Carbon nanoTubes (CNTs). The Ag-LaFeO3 powder modified with CNTs (CNTs-Ag-LaFeO3) was prepared by a sol-gel method combined with microwave chemical synthesis. The structure and gas-sensing properties were investigated. The results show that the structure of CNTs-Ag-LaFeO3 is of orthogonal perovskite. The sensitivity of 0.75% CNTs-Ag-LaFeO3 powder for 1 ppm formaldehyde is 13 at 86°C. The response and recovery time are 100s and 60s, respectively. Moreover, the sensor also has an obvious response for 1ppm formaldehyde at 58°C.

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.

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