Micro-chemo-mechanical hydrogen sensor based on contact resistance of carbon nanotubes array

2013 ◽  
Author(s):  
M.-O. Kim ◽  
K. Lee ◽  
H. Na ◽  
D.-S. Kwon ◽  
J. Choi ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Contact Resistance ◽  
Hydrogen Sensor

Carbon nanotubes based hydrogen sensor on paper using Langmuir-Blodgett technique

2016 ◽  
Author(s):  
Muhammad M. Ramli ◽  
Siti S. Mat Isa ◽  
N.A.M. Ahmad Hambali ◽  
M. Mohamad Isa ◽  
S. R. Kasjoo ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Hydrogen Sensor ◽  
Langmuir Blodgett

scholarly journals Contact resistance between carbon nanotubes

2001 ◽  
Vol 63 (16) ◽  
Author(s):  
Alper Buldum ◽  
Jian Ping Lu
Keyword(s):  
Carbon Nanotubes ◽  
Contact Resistance

ANNEALING EFFECTS ON ELECTRIC CONTACTS BETWEEN CARBON NANOTUBES AND ELECTRODES

2006 ◽  
Vol 05 (04n05) ◽  
pp. 401-406 ◽  
Author(s):  
JINGQI LI ◽  
QING ZHANG ◽  
MARY B. CHAN-PARK ◽  
YEHAI YAN
Keyword(s):  
Carbon Nanotubes ◽  
Contact Resistance ◽  
Schottky Barrier ◽  
Isopropyl Alcohol ◽  
Single Wall Carbon Nanotubes ◽  
Total Resistance ◽  
Ambient Environment ◽  
Barrier Heights ◽  
Electric Contacts ◽  
Annealing Effects

Single wall carbon nanotubes suspended in isopropyl alcohol are placed between two Au electrodes by ac dielectrophoresis method. Total resistance including the contact resistance and intrinsic tube resistance is found to decrease from 105–106 Ω for as-prepared samples to 104 Ω after annealing at 300°C in ambient environment. Measured I–V curves and Schottky barrier heights suggest that the electric contacts are changed from Schottky to Ohmic characteristics after annealing. These results demonstrate that annealing in ambient environment is a simple and efficient way to decrease the contact resistance.

Characterization of Contact Resistance between Carbon Nanotubes Film and Metal Electrodes

2013 ◽  
Vol 683 ◽  
pp. 238-241
Author(s):  
Ki Bong Han ◽  
Yong Ho Choi
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Contact Resistance ◽  
Chemical Properties ◽  
Metal Electrode ◽  
Metal Contacts ◽  
Metal Electrodes ◽  
3 Dimensional ◽  
Current Path ◽  
Classical Technique

Carbon nanotube has attracted great research attentions due to its outstanding electrical, physical, mechanical, chemical properties. Based on its excellent properties, the carbon nanotube is promising nanoscale material for novel electrical, mechanical, chemical, and biological devices and sensors. However, it is very difficult to control the structure of carbon nanotube during synthesis. A carbon nanotubes film has 3 dimensional structures of interwoven carbon nanotubes as well as unique properties such as transparency, flexibility and good electrical conductivity. More importantly, the properties of carbon nanotubes are ensemble averaged in this formation. In this research, we study the contact resistance between carbon nanotubes film and metal electrode. For most of electrical devices using carbon nanotubes film, it is necessary to have metal electrodes on the film for current path. A resistance at the contact lowers the electrical efficiencies of the devices. Therefore, it is important to measure and characterize the contact resistance and lower it for better efficiencies. The device demonstrated in this study using classical technique for metal contacts provides relatively reliable contact resistance measurements for carbon nanotubes film applications.

Comparative Studies of Transparent Conductive Electrodes Based on Silver Nanowires and Carbon Nanotubes

2015 ◽  
Vol 778 ◽  
pp. 75-78
Author(s):  
Hai Yan Hao ◽  
Lei Dai ◽  
Zhe Li ◽  
Kam Hung Low
Keyword(s):  
Carbon Nanotubes ◽  
Contact Resistance ◽  
Sheet Resistance ◽  
Comparative Studies ◽  
Mechanical Stability ◽  
Silver Nanowires ◽  
Lower Sheet ◽  
Transparent Conductive Electrodes ◽  
Lower Sheet Resistance

The effects of reducing the contact resistance of AgNW networks by using TiO2and PEDOT:PSS were compared. The AgNW+PEDOT:PSS TCE was able to give a lower sheet resistance of 30~60Ω/□, while the AgNW+TiO2gave a relatively higher, but still practical value of 85~125Ω/□. Then the AgNW+PEDOT:PSS TCE was further compared with the SWCNT+PEDOT:PSS TCE, and it was found the SWCNT+PEDOT:PSS TCE had a lower conductivity of 70~110Ω/□ but a superior long-term mechanical stability.

Thermal Conductivity Measurement of Vertically Aligned Single-Walled Carbon Nanotubes Utilizing Temperature Dependence of Raman Scattering

2011 ◽  
Author(s):  
Kei Ishikawa ◽  
Shohei Chiashi ◽  
Saifullah Badar ◽  
Theerapol Thurakitseree ◽  
Takuma Hori ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Carbon Nanotubes ◽  
Contact Resistance ◽  
Temperature Dependence ◽  
Thermal Contact Resistance ◽  
Thermal Contact ◽  
Single Walled Carbon Nanotubes ◽  
Vertically Aligned ◽  
Walled Carbon Nanotubes ◽  
Swnt Film

We present a method for measuring the thermal conductivity and the thermal contact resistance between the film and the substrate of vertically-aligned single-walled carbon nanotubes (VA-SWNTs) grown on Si substrate by ACCVD (Alcohol Catalytic Chemical Vapor Deposition) method, utilizing temperature dependence of the Raman spectrum obtained from SWNTs. The method utilizes the excitation laser of the Raman system to heat the VA-SWNT film and measure the temperature simultaneously. The method finds the thermal conductivity of the VA-SWNT film to be around 1 Wm−1K−1 and the thermal contact resistance between the substrate and the film to be around 10−5∼10−6 m2KW−1. The obtained film thermal conductivity is converted into equivalent thermal conductivity of an individual SWNT, whose value is several tens of Wm−1K−1, and is more than an order of magnitude smaller than the reports on individual SWNTs.

Frictional and Electrical Properties of Multiwalled Carbon Nanotubes

2005 ◽  
Author(s):  
P. L. Dickrell ◽  
N. R. Raravikar ◽  
S. K. Pal ◽  
L. S. Schadler ◽  
P. M. Ajayan ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Friction Coefficient ◽  
Electrical Properties ◽  
Contact Resistance ◽  
Coefficient Of Friction ◽  
Static Load ◽  
Tribological Behavior ◽  
Porous Alumina ◽  
Multiwalled Carbon ◽  
Vertically Aligned

This presentation examines the tribological properties and contact resistance of oriented capped carbon multiwalled nanotube (MWNT) films. Highly anisotropic tribological behavior of MWNT films oriented in mutually orthogonal directions is observed. The average values of coefficient of friction varied from high values (μ = 0.795) for vertically aligned nanotubes grown on rigid substrates to low values (μ = 0.090) for the same nanotubes dispersed flat on the same substrates. The results were insensitive to humidity, which is in contrast to graphite materials. The multiwalled nanotube layers also had a monotonic decrease in friction coefficient with increased surface temperature in both orientations, having a 32% drop in friction coefficient over a 73°C temperature rise. Preliminary results from contact resistance measurements of nanotube films grown through a porous alumina are investigated as a function of applied static load.

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