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.

Functionalization of Multiwalled Carbon Nanotubes with Cyclic Nitrones for Materials and Composites: Addressing the Role of CNT Sidewall Defects

2011 ◽  
Vol 23 (7) ◽  
pp. 1923-1938 ◽  
Author(s):  
Giuliano Giambastiani ◽  
Stefano Cicchi ◽  
Alessandra Giannasi ◽  
Lapo Luconi ◽  
Andrea Rossin ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Multiwalled Carbon Nanotubes ◽  
Multiwalled Carbon ◽  
Cyclic Nitrones

Enhanced field emission properties of thin-multiwalled carbon nanotubes: Role of SiOx coating

2006 ◽  
Vol 100 (10) ◽  
pp. 104303 ◽  
Author(s):  
J. S. Moon ◽  
P. S. Alegaonkar ◽  
J. H. Han ◽  
T. Y. Lee ◽  
J. B. Yoo ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Multiwalled Carbon Nanotubes ◽  
Field Emission ◽  
Multiwalled Carbon ◽  
Emission Properties ◽  
Field Emission Properties

Enhanced light sensing performance of a hybrid device developed using as-grown vertically aligned multiwalled carbon nanotubes on TCO substrates

RSC Advances ◽  
2014 ◽  
Vol 4 (87) ◽  
pp. 46970-46975 ◽  
Author(s):  
Mahananda Baro ◽  
Amreen A. Hussain ◽  
Arup R. Pal
Keyword(s):  
Carbon Nanotubes ◽  
Multiwalled Carbon Nanotubes ◽  
Low Light ◽  
Multiwalled Carbon ◽  
Hybrid Device ◽  
Light Sensing ◽  
Direct Growth ◽  
Vertically Aligned ◽  
Self Powered ◽  
Sensing Performance

We report direct growth of MWCNTs on TCO substrates and its applicability in low light sensitive self-powered hybrid photodetector.

Inelastic Deformations in Multi-Walled Carbon Nanotubes

1999 ◽  
Vol 593 ◽  
Author(s):  
D. Tekleab ◽  
R. Czerw ◽  
A. Rubio ◽  
P.M. Ajayan ◽  
D.L. Carroll
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
Multiwalled Carbon Nanotubes ◽  
High Power ◽  
Multiwalled Carbon ◽  
Ultrasonic Agitation ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes ◽  
Insight Into

ABSTRACTWe report the use of high power ultrasonic agitation to create inelastic deformations in multiwalled carbon nanotubes. Using STM coupled with TEM we show that this damage can range from kinking to breaking of continuous tube walls into segments. Such deformed tubes provide an insight into the role of re-hybridization in the electrical and mechanical properties of tubes.

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.

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.

Sign in / Sign up

Export Citation Format

Share Document