Property of NOx Gas Sensor Using Carbon Nanotube Prepared by Thermal CVD Method

2007 ◽  
Vol 124-126 ◽  
pp. 1253-1256 ◽  
Author(s):  
Tsuyoshi Ueda ◽  
Md. Mosharaf Hossain Bhuiyan ◽  
H. Norimatsu ◽  
S. Katsuki ◽  
Tomoaki Ikegami
Keyword(s):  
Carbon Nanotube ◽  
Gas Sensor ◽  
Gas Sensing ◽  
Chemical Vapor ◽  
Gas Concentration ◽  
Thermal Cvd ◽  
Cvd Method ◽  
Pt Electrodes ◽  
Measured Resistance ◽  
Sensor Temperature

Carbon nanotube (CNT) gas sensors for NOx gas detection were prepared. CNTs were grown on an Al2O3 substrate with interdigital Pt-electrodes (Al2O3 ceramic substrate) using both pulsed laser deposition (PLD) and thermal chemical vapor deposition (CVD) method. In this method, Al buffer layer and Fe catalytic thin film were prepared on the substrate by PLD method and then CNTs were grown by thermal CVD method. Surface images of CNTs on the substrates were observed by SEM, and the gas sensing property specific to NO gas was measured. Resistance of the prepared CNTs gas sensor decreased with increase of sensor temperature, and it decreased with increase of NO gas concentration at room temperature.

Defect-Controlled Gas Sensing Property of Nanostructured ZnO Films

2015 ◽  
Vol 814 ◽  
pp. 54-59
Author(s):  
Yong Qin Chang ◽  
Chang Jing Shao ◽  
Nan Jiang ◽  
Yan Jun Ma ◽  
Shi Qi Wang ◽  
...  
Keyword(s):  
Gas Sensor ◽  
Oxygen Vacancies ◽  
Gas Sensing ◽  
Chemical Vapor ◽  
Zno Films ◽  
Sensor Applications ◽  
Cvd Method ◽  
Short Recovery Time ◽  
Gas Sensing Properties ◽  
Ethanol Sensing

Nanostructured ZnO films were fabricated by chemical vapor deposition (CVD) method with different Sn source concentrations for ethanol sensing application. It was found that the morphology of the ZnO films were obviously affected by Sn concentration, while no any Sn signals were detected in the films. The response of the nanostructured ZnO films increases with the increase of ethanol concentrations, and the S2 sample displays the highest sensitivity. Thephotoluminescence spectra show that more oxygen vacancies exist in the S2 sample than the other samples, which reveals that oxygen vacancies may play a great role to improve the gas sensing properties of the ZnO films.A possible sensing mechanism was proposed to explain these phenomena.This work provides a very simple and efficient method to prepare ZnO gas sensor, its high response and short recovery time are also a merit for the ZnO films used in gas sensor applications.

Property of NOx Gas Sensor Using Carbon Nanotube Prepared by Thermal CVD Method

2007 ◽  
pp. 1253-1256
Author(s):  
Tsuyoshi Ueda ◽  
Md. Mosharaf Hossain Bhuiyan ◽  
H. Norimatsu ◽  
S. Katsuki ◽  
Tomoaki Ikegami
Keyword(s):  
Carbon Nanotube ◽  
Gas Sensor ◽  
Thermal Cvd ◽  
Cvd Method

scholarly journals Surface Modification of Carbon Nanotube Networked Films with Au Nanoclusters for Enhanced Gas Sensing Applications

2008 ◽  
Vol 2008 ◽  
pp. 1-8 ◽  
Author(s):  
M. Penza ◽  
R. Rossi ◽  
M. Alvisi ◽  
G. Cassano ◽  
M. A. Signore ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Gas Sensing ◽  
Chemical Vapor ◽  
Gas Sensitivity ◽  
Multiwalled Carbon ◽  
Sensing Applications ◽  
Sensor Temperature ◽  
P Type ◽  
Gas Response ◽  
Ppm Level

Multiwalled carbon nanotube (MWCNT) films have been deposited by using plasma-enhanced chemical vapor deposition (PECVD) system onto alumina substrates, provided with 6 nm thick cobalt (Co) growth catalyst for remarkably improved gas sensing, at working temperature in the range of 100–. Functionalization of the MWCNTs with nanoclusters of gold (Au) sputtering has been performed to modify the surface of carbon nanotube networked films for enhanced and specific gas detection up to sub-ppm level. It is demonstrated that the gas sensitivity of the MWCNT-based sensors depends on Au-loading used as surface-catalyst. The gas response of MWCNT-based chemiresistor is attributed top-typeconductivity in the Au-modified semiconducting MWCNTs with a very good short-term repeatability and faster recovery. The sensor temperature of maximum sensitivity of the Au-functionalized MWCNTs is found to decrease with increasing Au-loading on their surface, and continuous gas monitoring at ppb level of is effectively performed with Au-modified MWCNT chemiresistors.

Carbon Nanotube Gas Sensor Fabricated on Anodic Aluminum Oxide

2007 ◽  
Vol 124-126 ◽  
pp. 1309-1312
Author(s):  
Nguyen Duc Hoa ◽  
Nguyen Van Quy ◽  
Gyu Seok Choi ◽  
You Suk Cho ◽  
Se Young Jeong ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Gas Sensor ◽  
Chemical Vapor ◽  
Fast Response ◽  
Device Fabrication ◽  
Alumina Oxide ◽  
Response And Recovery ◽  
New Type ◽  
P Type

A new type of gas sensor was realized by directly depositing carbon nanotube on nano channels of the anodic alumina oxide (AAO) fabricated on p-type silicon substrate. The carbon nanotubes were synthesized by thermal chemical vapor deposition at a very high temperature of 1200 oC to improve the crystallinity. The device fabrication process was also developed. The contact of carbon nanotubes and p-type Si substrate showed a Schottky behavior, and the Schottky barrier height increased with exposure to gases while the overall conductivity decreased. The sensors showed fast response and recovery to ammonia gas upon the filling (400 mTorr) and evacuation.

scholarly journals Simple and rapid gas sensing using a single-walled carbon nanotube field-effect transistor-based logic inverter

2021 ◽  
Author(s):  
Salomé Forel ◽  
Leandro Sacco ◽  
Alice Castan ◽  
Ileana Florea ◽  
Costel Sorin Cojocaru
Keyword(s):  
Carbon Nanotube ◽  
Power Consumption ◽  
Data Processing ◽  
Gas Sensor ◽  
Field Effect ◽  
Field Effect Transistor ◽  
Gas Sensing ◽  
Single Walled Carbon Nanotube ◽  
Effect Transistor ◽  
System Miniaturization

We design a gas sensor by combining two SWCNT-FET devices in an inverter configuration enabling a better system miniaturization together with a reduction of power consumption and ease of data processing.

scholarly journals Effect of GNWs/NiO-WO3/GNWs Heterostructure for NO2 Gas Sensing at Room Temperature

Sensors ◽  
2022 ◽  
Vol 22 (2) ◽  
pp. 626
Author(s):  
Seokhun Kwon ◽  
Seokwon Lee ◽  
Joouk Kim ◽  
Chulmin Park ◽  
Hosung Jung ◽  
...  
Keyword(s):  
Particulate Matter ◽  
Room Temperature ◽  
Microwave Plasma ◽  
Gas Sensing ◽  
Chemical Vapor ◽  
Gas Concentration ◽  
Negative Change ◽  
Low Concentrations ◽  
Detection Characteristics ◽  
No2 Detection

Recently, as air pollution and particulate matter worsen, the importance of a platform that can monitor the air environment is emerging. Especially, among air pollutants, nitrogen dioxide (NO2) is a toxic gas that can not only generate secondary particulate matter, but can also derive numerous toxic gases. To detect such NO2 gas at low concentration, we fabricated a GNWs/NiO-WO3/GNWs heterostructure-based gas sensor using microwave plasma-enhanced chemical vapor deposition (MPECVD) and sputter, and we confirmed the NO2 detection characteristics between 10 and 50 ppm at room temperature. The morphology and carbon lattice characteristics of the sensing layer were investigated using field emission scanning electron microscopy (FESEM) and Raman spectroscopy. In the gas detection measurement, the resistance negative change according to the NO2 gas concentration was recorded. Moreover, it reacted even at low concentrations such as 5–7 ppm, and showed excellent recovery characteristics of more than 98%. Furthermore, it also showed a change in which the reactivity decreased with respect to humidity of 33% and 66%.

Analytical modeling of phosphorene-based NO2 gas sensor

2019 ◽  
Vol 33 (14) ◽  
pp. 1950143 ◽  
Author(s):  
Elham Mansouri ◽  
Javad Karamdel ◽  
Mohammad Taghi Ahmadi ◽  
Masoud Berahman
Keyword(s):  
Gas Sensor ◽  
Carrier Mobility ◽  
Analytical Modeling ◽  
Gas Sensing ◽  
High Surface ◽  
Volume Ratio ◽  
Gas Concentration ◽  
Proposed Model ◽  
Gas Sensing Properties ◽  
Acceptable Agreement

Phosphorene is a new two-dimensional material that has great potentials in Nano electronic application, so it has attracted more researchers’ attention nowadays. Indeed, phosphorene is an interesting material in gas sensing, due to its high surface-to-volume ratio and its carrier mobility. Many studies have been reported on phosphorene gas sensing, but there is not enough study on analytical modeling of phosphorene gas sensing properties. In this research, by adopting data from experimental NO2-based gas sensor, an analytical model of the phosphorene gas sensing behavior is presented. Then, the experimental results of NO2 gas sensing are compared with the proposed model and acceptable agreement is reported. This new model is adapted to predict phosphorene gas sensing performance in higher NO2 gas concentrations, which demonstrates, linear relation is established in higher concentrations same as lower ppb NO2 gas concentration. So, we have predicted the result of NO2 gas sensing for higher concentration based on experimental sensing.

scholarly journals INVESTIGATION OF SENSITIVITY AND SELECTIVITY OF MWCNT–BASED SENSOR FOR AMMONIAC GAS DETECTION AT ROOM TEMPERATURE

2012 ◽  
Vol 15 (2) ◽  
pp. 62-69
Author(s):  
Lich Quang Nguyen ◽  
Tu Cong Nguyen ◽  
Anh Tuan Ly ◽  
Thanh Phuc Tran ◽  
Pho Quoc Phan ◽  
...  
Keyword(s):  
Gas Sensors ◽  
Vapor Deposition ◽  
Room Temperature ◽  
Chemical Vapor ◽  
Gas Detection ◽  
Cvd Method ◽  
Sensor Device ◽  
Pt Electrodes ◽  
Multi Walled Carbon Nanotube ◽  
Sensitivity And Selectivity

Gas sensors based on multi-walled carbon nanotube (MWCNT) for detecting gaseous molecules of ammoniac (NH3) were developed and investigated. MWCNT film was grown directly by chemical vapor deposition (CVD) method on Pt electrodes to fabricate sensor device. The CNT based – gas sensor is shown sensitively and selectively to NH3 gas at room temperature.

scholarly journals Synthesis of Carbon Nanotube by Chemical Vapor Deposition (CVD) Method

2020 ◽  
Vol 8 (6) ◽  
pp. 30-33
Author(s):  
Munaly Akter ◽  
Dr. Md. Ehasanul Haque ◽  
Md. Masud Parvez ◽  
Dr. Md. Abdul Matin
Keyword(s):  
Chemical Vapor Deposition ◽  
Carbon Nanotube ◽  
Vapor Deposition ◽  
Chemical Vapor ◽  
Cvd Method

Synthesis and Bio-Compatibility Study of Thermal-CVD Grown Graphene

2016 ◽  
Vol 15 (05n06) ◽  
pp. 1660016
Author(s):  
Mayukh Chakravarty ◽  
Rishi Sharma ◽  
Kumar Amit ◽  
Neelima Sharma ◽  
S. K. Pradhan
Keyword(s):  
Chemical Vapor ◽  
Compatibility Study ◽  
Thermal Cvd ◽  
Cvd Method ◽  
Atomic Force ◽  
Number Of Layers ◽  
Potential Applications ◽  
Grown Graphene ◽  
Sbf Solution ◽  
Bio Compatibility

Graphene based nanomaterials have attracted tremendous attention for their potential applications in various fields. In the present investigation, the growth of graphene on silicon substrate using thermal chemical vapor deposition (Thermal-CVD) method has been reported and the biocompatibility of obtained yield has been critically assessed. Raman spectra confirm the formation of graphene which was found to be the best to obtain minimal number of layers of graphene. Three prominent peaks have been observed at approximately 1360[Formula: see text]cm[Formula: see text] (D Peak), 1595[Formula: see text]cm[Formula: see text] (G Peak) and 2700[Formula: see text]cm[Formula: see text] (2D Peak). Haemolysis test and simulated body fluid (SBF) test are performed to check the biocompatibility of the synthesized graphene samples. Atomic force micrographs of the samples are taken prior and after soaking them in SBF solution to study their interaction with the fluid. Haemolysis percentage is determined using UV-Vis to determine the hemocompatible nature of the samples. The results of haemolysis and SBF test demonstrated that Thermal-CVD grown graphene samples are biocompatible.

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