scholarly journals Explosive Molecule Sensing at Lattice Defect Sites in Metallic Carbon Nanotubes

2021 ◽  
Author(s):  
Manasi Doshi ◽  
Eric Paul Fahrenthold
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Experimental Research ◽  
Gas Sensing ◽  
Lattice Defect ◽  
Sensing Mechanism ◽  
Defect Sites ◽  
Chemiresistive Sensing ◽  
Hazardous Gas

Explosives and hazardous gas sensing using carbon nanotube (CNT) based sensors has been a focus of considerable experimental research. The simplest sensors have employed a chemiresistive sensing mechanism, and rely...

Metallic Nanowires From Carbon Nanotube Building Blocks: The Effect of Atomic Defects on the Nanotube Influencing Nanowire Growth

2003 ◽  
Author(s):  
B. Panchapakesan ◽  
Kousik Sivakumar ◽  
Shaoxin Lu
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Electric Field ◽  
Building Blocks ◽  
Model Systems ◽  
Initial Surface ◽  
Sensors And Actuators ◽  
Platinum Nanowires ◽  
Defect Sites ◽  
Current Densities

Manipulation and control of matter at the nano- and atomic level are crucial for the success of nano-scale sensors and actuators. The ability to control and synthesize multilayer structures using carbon nanotubes that will enable to build electronic devices within a nanotube is still in its infancy. In this paper, we present results on selective electric field assisted deposition of metals on carbon nanotubes realizing metallic nanowire structures. Silver and platinum nanowires has been fabricated using this approach due to its applications in chemical sensing sensing as catalytic materials to sniff toxic agents and in the area of biomedical nanotechnology for construction of artificial muscles. The electric field assisted technique allows the deposition of metals with high degree of selectivity on carbon nanotubes by manipulating the charges on the surface of the nanotubes. The thickness and the growth of the nanowires was altered by inducing defects on the initial surface of the nanotubes that affected the local current densities and electrochemical reduction of silver and platinum on those defect sites. SEM and TEM investigations revealed silver and platinum nanowires between 10 nm-100 nm in diameter. Relatively higher metal deposition was achieved in defect related sites or places where the nanotubes criss-crossed each other, due to the high current densities in these sites. The present technique is versatile and enables the fabrication of host of different types of metallic and semiconduting nanowires using carbon nanotube templates for nanoelectronics and myriad of sensor applications. Further, nanowires can also serve as model systems for studying quantum size effects in these dimensions.

Carbon nanotube-metal oxide nanocomposite gas sensing mechanism assessed via NO2 adsorption on n-WO3/p-MWCNT nanocomposites

2020 ◽  
Vol 46 (18) ◽  
pp. 29233-29243 ◽  
Author(s):  
Nguyen Manh Hung ◽  
Nguyen Duc Chinh ◽  
Tien Dai Nguyen ◽  
Eui Tae Kim ◽  
GyuSeok Choi ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Metal Oxide ◽  
Gas Sensing ◽  
Sensing Mechanism ◽  
No2 Adsorption

Ionization gas sensing mechanism of a hybrid nanostructure with carbon nanotubes and ZnO nanorods

2013 ◽  
Vol 183 ◽  
pp. 81-86 ◽  
Author(s):  
Changhua Zhan ◽  
Yuanzhi Pan ◽  
Zi Wang ◽  
Yanfang Wang ◽  
Hongfei He ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Gas Sensing ◽  
Zno Nanorods ◽  
Hybrid Nanostructure ◽  
Sensing Mechanism

Ammonia-Gas-Sensing Characteristics of WO3/Carbon Nanotubes Nanocomposites: Effect of Nanotube Content and Sensing Mechanism

2016 ◽  
Vol 8 (3) ◽  
pp. 524-533 ◽  
Author(s):  
Nguyen Van Duy ◽  
Nguyen Duc Hoa ◽  
Nguyen Thanh Dat ◽  
Dang Thi Thanh Le ◽  
Nguyen Van Hieu
Keyword(s):  
Carbon Nanotubes ◽  
Gas Sensing ◽  
Ammonia Gas ◽  
Sensing Mechanism ◽  
Sensing Characteristics

B121 Gas sensing mechanism of carbon nanotube thin film

2015 ◽  
Vol 2015 (0) ◽  
pp. _B121-1_-_B121-2_
Author(s):  
Takuya Kokabu ◽  
Shuhei Inoue ◽  
Yukihiko Matsumura
Keyword(s):  
Thin Film ◽  
Carbon Nanotube ◽  
Gas Sensing ◽  
Sensing Mechanism

CARBON NANOCOMPOSITE COATED TEXTILE-BASED SENSOR: SENSING MECHANISM AND DURABILITY

2021 ◽  
Author(s):  
AMIT CHAUDHARI ◽  
SAGAR DOSHI ◽  
MADISON WEISS ◽  
DAE HAN SUNG ◽  
ERIK THOSTESON
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Electrical Resistance ◽  
Wearable Sensors ◽  
Composite Films ◽  
Large Change ◽  
Dip Coating ◽  
Porous Coating ◽  
Sensing Mechanism ◽  
Smart Garments

Carbon nanotube (CNT) composite films are deposited onto stretchable knit fabrics using electrophoretic deposition (EPD) and dip-coating techniques, which are industrially scalable processes for producing future wearable sensors. The deposited CNTs create an electrically conductive nanocomposite film on the surface of the fibers. These nanocomposite coated fabrics exhibit piezoresistive properties; under mechanical deformation/stretching, a large change in the electrical resistance is observed. Polyethyleneimine (PEI) functionalized carbon nanotubes deposited using EPD create a uniform, extremely thin porous coating on the fiber. Initial results show ultrahigh sensitivity of the carbon nanotube coated fabric when tested on elbow/knee to detect range of motion. The sensitivity of these sensors is exceptionally high when compared to a typical carbon nanotube-based polymer nanocomposite. The nanocomposite coating does not affect fabric's breathability or flexibility, making the sensor comfortable to wear. Because of these unique properties, tremendous potential exists for their use in functional/smart garments. Changes in electrical resistance for these fabrics are influenced by a combination of electron tunneling between the carbon nanotubes and the microstructure of the fabric. To investigate and characterize the unique sensing mechanism, the nanotube coated knit fabric's electromechanical response is studied at different length scales, from individual yarns to fabric levels. For applications in wearable sensors, the durability of the nanotube coating on the fabric is critical for repeatable and reliable sensing response. Durability testing of the sensing fabric for washing loads was conducted to study the nanotube coating's robustness. CNT coating's adhesion quality is evaluated based on the weight loss in the specimen and loss in electrical conductivity in each wash cycle. This research addresses the potential of these sensors for functional/smart garments by examining the underlying mechanism of the sensor response and the durability of the carbon nanotube coating.

Gas sensing mechanism of carbon nanotubes: From single tubes to high-density networks

Carbon ◽  
2014 ◽  
Vol 69 ◽  
pp. 417-423 ◽  
Author(s):  
Anthony Boyd ◽  
Isha Dube ◽  
Georgy Fedorov ◽  
Makarand Paranjape ◽  
Paola Barbara
Keyword(s):  
Carbon Nanotubes ◽  
Gas Sensing ◽  
High Density ◽  
Sensing Mechanism

scholarly journals Sensing mechanism of an ionization gas temperature sensor based on a carbon nanotube film

RSC Advances ◽  
2017 ◽  
Vol 7 (84) ◽  
pp. 53265-53269 ◽  
Author(s):  
Hui Song ◽  
Yong Zhang ◽  
Jiaxing Cao
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Field Emission ◽  
Temperature Sensor ◽  
Gas Temperature ◽  
Electrode Structure ◽  
Field Emission Cathode ◽  
Ionized Gas ◽  
Sensing Mechanism ◽  
Emission Cathode

In this paper, we propose a novel ionized gas temperature sensor which has a triple-electrode structure and carbon nanotubes (CNTs) as a field emission cathode.

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