scholarly journals Ammonia Gas Sensing Characteristic of P3HT-rGO-MWCNT Composite Films

2021 ◽  
Vol 11 (15) ◽  
pp. 6675
Author(s):  
Tran Si Trong Khanh ◽  
Tran Quang Trung ◽  
Le Thuy Thanh Giang ◽  
Tran Quang Nguyen ◽  
Nguyen Dinh Lam ◽  
...  
Keyword(s):  
Response Time ◽  
Gas Sensor ◽  
Gas Sensing ◽  
Composite Films ◽  
Weight Ratio ◽  
Film Surface ◽  
Relative Sensitivity ◽  
Ammonia Gas ◽  
Casting Technique ◽  
Multi Walled Carbon Nanotubes

In this work, the P3HT:rGO:MWCNTs (PGC) nanocomposite film applied to the ammonia gas sensor was successfully fabricated by a drop-casting technique. The results demonstrated that the optimum weight ratio of the PGC nanocomposite gas sensor is 20%:60%:20% as the weight ratio of P3HT:rGO:MWCNTs (called PGC-60). This weight ratio leads to the formation of nanostructured composites, causing the efficient adsorption/desorption of ammonia gas in/out of the film surface. The sensor based on PGC-60 possessed a response time of 30 s, sensitivity up to 3.6% at ammonia gas concentration of 10 ppm, and relative sensitivity of 0.031%/ppm. These results could be attributed to excellent electron transportation of rGO, the main adsorption activator to NH3 gas of P3HT, and holes move from P3HT to the cathodes, which works as charge “nano-bridges” carriers of Multi-Walled Carbon Nanotubes (MWCNTs). In general, these three components of PGC sensors have significantly contributed to the improvement of both the sensitivity and response time in the NH3 gas sensor.

scholarly journals Characterization of NH\(_3\) Sensing Properties of P3HT+rGO+CNT Composite Films Made by Spin-coating

2018 ◽  
Vol 28 (4) ◽  
pp. 369 ◽  
Author(s):  
Lam Minh Long ◽  
Nguyen Nang Dinh ◽  
Tran Quang Trung
Keyword(s):  
Spin Coating ◽  
Gas Sensing ◽  
Composite Films ◽  
Relative Sensitivity ◽  
Gas Content ◽  
Ammonia Gas ◽  
Atomic Force ◽  
A Value ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

Thin films of poly(3-hexylthiophene) (P3HT) incorporated with reduced graphene oxide (rGO) and multi-walled carbon nanotubes (CNTs) were prepared by spin-coating technique. Atomic force microscope (AFM) surface morphology, UV-Vis spectra and NH3 gas sensing of the films were studied. Results showed that the P3HT embedded with a content of 20 wt.% of rGO and 10 % of CNTs (abbreviated to P3GC) resulted in the formation of nanostructured composites, exhibiting 1.50 nm-roughness surface and a semiconducting material with a bandgap of 1.92eV. These structure and composition of the P3GC film are appropriate for making film sensors whose resistance changes as a function of gas concentration. Monitoring ammonia gas by the sensors showed that the responding time of the sensing reached a value as fast as 30 s, the response at ammonia gas content of 10 ppm attained a value as large as 0.8% and the relative sensitivity was of 0.05 %/ppm.

The Investigation of Quartz Crystal Microbalance (QCM) Formaldehyde Sensors Based on PEI-MWCNTs Composites

2014 ◽  
Vol 1030-1032 ◽  
pp. 217-222
Author(s):  
Ying Fei He ◽  
Ya Dong Jiang ◽  
Hui Ling Tai ◽  
Guang Zhong Xie
Keyword(s):  
Gas Sensor ◽  
Quartz Crystal ◽  
Gas Sensing ◽  
Composite Films ◽  
Multi Walled Carbon Nanotubes ◽  
Quartz Crystal Microbalances ◽  
Response And Recovery ◽  
Formaldehyde Sensing ◽  
Morphology Of Films ◽  
Walled Carbon Nanotubes

The detection of formaldehyde is very necessary and important in both industrial and residential environments. In this paper, a novel quartz crystal microbalances (QCM) formaldehyde gas sensor has been successful fabricated based on Polyethylenimine (PEI)-multi-walled carbon nanotubes (MWCNTs) composite films by the spraying process. The morphology of films was analyzed by scanning electron microscope (SEM), and formaldehyde-sensing properties of sensors were investigated. The results showed that the prepared QCM gas sensor exhibited good response and recovery behaviors towards formaldehyde gas in the concentration range of 0-10 ppm at room temperature, which also has the superior repeatability and selectivity. Moreover, the gas-sensing mechanism of sensors was studied.

Metal-oxide based ammonia gas sensors: A review

2020 ◽  
Vol 10 ◽  
Author(s):  
Priya Gupta ◽  
Savita Maurya ◽  
Narendra Kumar Pandey ◽  
Vernica Verma
Keyword(s):  
Metal Oxide ◽  
Metal Oxides ◽  
Gas Sensor ◽  
Gas Sensors ◽  
Review Paper ◽  
Gas Sensing ◽  
Gas Sensitivity ◽  
Ammonia Gas ◽  
Ammonia Sensing ◽  
Ammonia Gas Sensors

: This review paper encompasses a study of metal-oxide and their composite based gas sensors used for the detection of ammonia (NH3) gas. Metal-oxide has come into view as an encouraging choice in the gas sensor industry. This review paper focuses on the ammonia sensing principle of the metal oxides. It also includes various approaches adopted for increasing the gas sensitivity of metal-oxide sensors. Increasing the sensitivity of the ammonia gas sensor includes size effects and doping by metal or other metal oxides which will change the microstructure and morphology of the metal oxides. Different parameters that affect the performances like sensitivity, stability, and selectivity of gas sensors are discussed in this paper. Performances of the most operated metal oxides with strengths and limitations in ammonia gas sensing application are reviewed. The challenges for the development of high sensitive and selective ammonia gas sensor are also discussed.

scholarly journals Ammonia Gas Detection by Tannic Acid Functionalized and Reduced Graphene Oxide at Room Temperature

2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
Sweejiang Yoo ◽  
Xin Li ◽  
Yuan Wu ◽  
Weihua Liu ◽  
Xiaoli Wang ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Gas Sensor ◽  
Tannic Acid ◽  
Room Temperature ◽  
Gas Sensing ◽  
High Sensitivity ◽  
Gas Detection ◽  
Ammonia Gas ◽  
Reduced Graphene

Reduced graphene oxide (rGO) based chemiresistor gas sensor has received much attention in gas sensing for high sensitivity, room temperature operation, and reversible. Here, for the first time, we present a promising chemiresistor for ammonia gas detection based on tannic acid (TA) functionalized and reduced graphene oxide (rGOTA functionalized). Green reductant of TA plays a major role in both reducing process and enhancing the gas sensing properties ofrGOTA functionalized. Our results showrGOTA functionalizedonly selective to ammonia with excellent respond, recovery, respond time, and recovery times.rGOTA functionalizedelectrical resistance decreases upon exposure to NH3where we postulated that it is due to n-doping by TA and charge transfer betweenrGOTA functionalizedand NH3through hydrogen bonding. Furthermore,rGOTA functionalizedhinders the needs for stimulus for both recovery and respond. The combination of greener sensing material and simplicity in overall sensor design provides a new sight for green reductant approach of rGO based chemiresistor gas sensor.

Nanostructured ZrO2 Thin Films Deposited by Spray Pyrolysis Techniques for Ammonia Gas Sensing Application

2015 ◽  
Vol 56 ◽  
pp. 120-130 ◽  
Author(s):  
S.B. Deshmukh ◽  
R.H. Bari
Keyword(s):  
Thin Films ◽  
Grain Size ◽  
Surface Morphology ◽  
Spray Pyrolysis ◽  
Gas Sensing ◽  
Spray Pyrolysis Technique ◽  
Film Surface ◽  
Ammonia Gas ◽  
Water Solvent ◽  
Average Grain Size

The spray pyrolysis deposition technique has number of advantages to produce advance nanostructured oxide films. The film surface morphology and structure depends on the precursor and doping solution and solvents used with their optimized parameters. The surface to volume ratio is achieved is beneficial to gas sensing. Therefore in this paper we report the nanostructured ZrO2 thin films was prepared using spray pyrolysis technique for ammonia gas sensing. There is various precursors such as Zirconium acetylacetonate, Zirconium nitrate, Zirconium tetra chloride etc. In spite of them, the Zirconium oxychloride octohydrate (0.05 M) was chosen as precursor solution and was prepared by dissolving in pure distilled water (Solvent). The films were deposited on heated glass substrate at 350◦C and were annealed at 500◦C for 1 hrs. It was characterized using XRD, FESEM, and TEM technique to examine crystal structure, surface morphology and microstructure properties. The average crystallite and grain size observed to be nanostructured in nature. The different test target gas performances were tested with various concentrations at different operating temperature. The films sprayed for 20 min with optimized spray parameter were observed to be most sensitive (S=58.5) to NH3 for 500 ppm at 150°C. The film thickness dependence parameters: FWHM (0.02678 radians) for peak 111, Inter-planer distance (d=0.2958 nm), lattice parameters Inter-atomic spacing ( a=0.511 nm), atomic volume(a3= 133Å3 ),micro strain (2.8 to 0.76 x 10-2), crystallite size (4-5nm) average grain size (32nm), dislocation density (1.73 x1015 lines/cm2), texture coefficient (>1), specific surface area(31 m2/g), activation energy and band gap were studied. The sensor shows quick response (4 s) and fast recovery (10 s). Reported results are discussed and interpreted

Ion Beam Modified Conducting Polymer Composites: Material for Gas Sensing

2005 ◽  
Vol 889 ◽  
Author(s):  
Virendra Singh ◽  
Manindar Kaur ◽  
Tejvir Singh ◽  
Amita Chandra ◽  
Alok Srivastava
Keyword(s):  
Gas Sensing ◽  
Ion Beam ◽  
Composite Films ◽  
Casting Method ◽  
Free Standing ◽  
Ammonia Gas ◽  
Conducting Composite ◽  
Sensor Material ◽  
Solution Casting Method ◽  
Conducting Polymer Composites

AbstractA polyaniline based conducting composite was prepared by oxidative polymerisation of aniline in presence of polyvinylchloride (PVC) matrix. The coherent free standing thin films of the composite were prepared by solution casting method. The PVC-polyaniline composite (90:10) of thickness 40 μm was irradiated with 90 MeV C5+ ions at different ion fluence ranging 5× 1011-5× 1013 ions/cm2. The changes in resistance of pristine and irradiated composite in presence of ammonia gas were studied. A general decrease in surface resistance is observed upon irradiation. The sensitivity, response time and recovery time were studied as a function of ion fluence on exposing the sensor material to ammonia gas at ambient condition. It is observed that irradiated composite films are more sensitive and fast in response to ammonia gas. The preliminary results observed are encouraging.

scholarly journals Fabrication of a Miniature Zinc Aluminum Oxide Nanowire Array Gas Sensor and Application for Environmental Monitoring

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Chin-Guo Kuo ◽  
Chi-Wu Huang ◽  
Jung-Hsuan Chen ◽  
Yueh-Han Liu
Keyword(s):  
Aluminum Alloy ◽  
Aluminum Oxide ◽  
Gas Sensor ◽  
Gas Sensing ◽  
Operating Temperature ◽  
Nanowire Array ◽  
Weight Percentage ◽  
Casting Technique ◽  
Semiconductor Gas Sensor ◽  
Zinc Aluminum Oxide

A miniature n-type semiconductor gas sensor was fabricated successfully using zinc aluminum oxide nanowire array and applied to sense oxygen. The present study provided a novel method to produce zinc aluminum alloy nanowire 80 nm in diameter by the vacuum die casting technique and then obtain zinc aluminum oxide nanowire array using the thermal oxidation technique. The gas sensing properties were evaluated through the change of the sensitivity. The factors influencing the sensitivity of the gas sensor, such as the alloy composition, operating temperature, and oxygen concentration, were investigated further. Experimental results indicated that the maximum sensitivity could be acquired when the weight percentage of aluminum was 5% in zinc aluminum alloy at the operating temperature of200°C.

scholarly journals Improvement in ammonia gas sensing behavior by polypyrrole/multi-walled carbon nanotubes composites

2012 ◽  
Vol 13 (2) ◽  
pp. 88-93 ◽  
Author(s):  
Woo-Kyung Jang ◽  
Ju-Mi Yun ◽  
Hyung-Il Kim ◽  
Young-Seak Lee
Keyword(s):  
Carbon Nanotubes ◽  
Gas Sensing ◽  
Ammonia Gas ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes
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