scholarly journals H2S-Sensing Studies Using Interdigitated Electrode with Spin-Coated Carbon Aerogel-Polyaniline Composites

Polymers ◽  
2021 ◽  
Vol 13 (9) ◽  
pp. 1457
Author(s):  
Aamna Bibi ◽  
Yuola Rose M. Rubio ◽  
Karen S. Santiago ◽  
His-Wei Jia ◽  
Mahmoud M. M. Ahmed ◽  
...  
Keyword(s):  
Gas Sensing ◽  
Carbon Aerogel ◽  
Average Response Time ◽  
Interdigitated Electrode ◽  
Gas Sensing Properties ◽  
Increased Sensitivity ◽  
Good Repeatability ◽  
Polyaniline Composites ◽  
Coated Carbon ◽  
Better Than

In this paper, carbon aerogel (CA)-polyaniline (PANI) composites were prepared and first applied in the study of H2S gas sensing. Here, 1 and 3 wt% of as-obtained CA powder were blended with PANI to produce composites, which are denoted by PANI-CA-1 and PANI-CA-3, respectively. For the H2S gas-sensing studies, the interdigitated electrode (IDE) was spin-coated by performing PANI and PANI-CA composite dispersion. The H2S gas-sensing properties were studied in terms of the sensor’s sensitivity, selectivity and repeatability. IDE coated with PANI-CA composites, as compared with pristine PANI, achieved higher sensor sensitivity, higher selectivity and good repeatability. Moreover, composites that contain higher loading of CA (e.g., 3 wt%) perform better than composites with lower loading of CA. At 1 ppm, PANI-CA-3 displayed increased sensitivity of 452% at relative humidity of 60% with a fast average response time of 1 s compared to PANI.

The Preparation of ZnO Gas-Sensing Material by Nucleation-Crystallization Separation Method

2010 ◽  
Vol 152-153 ◽  
pp. 1031-1037
Author(s):  
Xiu Tao Ge ◽  
Jun Hai Wang ◽  
Ding Wang ◽  
Jia Qiang Xu
Keyword(s):  
Gas Sensing ◽  
X Ray Diffraction ◽  
Distribution Method ◽  
Static State ◽  
X Ray ◽  
Sensing Material ◽  
Gas Sensing Properties ◽  
Phase Temperature ◽  
Co Precipitation ◽  
Better Than

The ZnO nanoparticles were synthesized by Nucleation-Crystallization Separation and co-precipitation. The structures and formed phase temperature of the samples were researched by X-ray diffraction (XRD) and DSC -TGA. Gas sensing properties of the samples were measured by a stationary state gas distribution method under static state. The results show that the ZnO prepared from Nucleation-Crystallization Separation has a higher response to 50 ppm ethanol and gasoline than ZnO prepared from co-precipitation. The sensitivity of ZnO prepared from Nucleation-Crystallization Separation to 50 ppm ethanol and gasoline are 34 and 68, which is better than the sensitivity of ZnO prepared from co-precipitation (17 and 28). The good sensing property may be due to the independence of nucleation and crystallization steps, which helps the more uniformity and thermal stability and the larger space utilization of ZnO particles.

Ozone Sensor on Flexible Substrate by ZnO Nanoparticles

2014 ◽  
Vol 605 ◽  
pp. 163-166 ◽  
Author(s):  
Mónica Acuautla ◽  
Sandrine Bernardini ◽  
Marc Bendahan
Keyword(s):  
Zno Nanoparticles ◽  
Gas Sensing ◽  
Flexible Substrate ◽  
Ozone Exposure ◽  
Fast Recovery ◽  
Gas Sensing Properties ◽  
Test Platform ◽  
Good Repeatability ◽  
Ozone Detection ◽  
Thermal Simulations

In this work the ozone detection in flexible substrate has been investigated. The flexible test platform with an integrated heater was designed and then characterized by thermal simulations using finite elements and its electrical properties have been studied. ZnO nanoparticles were deposited by drop coating process on the flexible substrate with platinum interdigited electrodes for gas detection. The gas sensing properties were determined by ozone exposure at different concentrations and temperatures. The gas sensing measurements present good response at different gas concentrations, good repeatability and fast recovery.

scholarly journals Improvement of NO Gas Sensing Properties of Polyaniline/MWCNT Composite by Photocatalytic Effect of TiO2

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Jumi Yun ◽  
Sonyeo Jeon ◽  
Hyung-Il Kim
Keyword(s):  
Carbon Nanotube ◽  
Electrical Resistance ◽  
Gas Sensing ◽  
Photocatalytic Effect ◽  
Highly Sensitive ◽  
Gas Sensing Properties ◽  
Nanotube Composites ◽  
Type Semiconductor ◽  
P Type ◽  
Coated Carbon

The highly sensitive and rapid NO gas sensor was prepared with polyaniline/TiO2/carbon nanotube composites. Aniline was polymerized on the surface of carbon nanotube (p-type semiconductor) with embedding TiO2. The gas sensing property was measured by the changes of electrical resistance without or with UV irradiation to investigate the photodegradation of NO by TiO2. The photo-degraded products such as HNO2, NO2, and HNO3, which were adsorbed on the PANi-coated carbon nanotubes, resulted in the decreased electrical resistance in the p-type semiconductors of carbon nanotube and polyaniline. The advantages of TiO2photocatalyst in gas sensing were apparent in the improvement in both sensitivity and response rate.

Polypyrrole Coated Carbon Nanotubes: Preparation, Characterization, and Gas-sensing Properties

2011 ◽  
Vol 26 (9) ◽  
pp. 961-968 ◽  
Author(s):  
Zhi-Min WANG ◽  
Xin-Cun TANG ◽  
Yuan-Hua XIAO ◽  
Xiao-Jing YU ◽  
Liang ZHANG ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Gas Sensing ◽  
Sensing Properties ◽  
Gas Sensing Properties ◽  
Coated Carbon

Mechanical, electromagnetic shielding and gas sensing properties of flexible cotton fiber/polyaniline composites

2020 ◽  
Vol 188 ◽  
pp. 107966 ◽  
Author(s):  
Weiyu Zhang ◽  
Xinpeng Zhang ◽  
Zhaofeng Wu ◽  
Karimay Abdurahman ◽  
Yali Cao ◽  
...  
Keyword(s):  
Cotton Fiber ◽  
Gas Sensing ◽  
Electromagnetic Shielding ◽  
Sensing Properties ◽  
Gas Sensing Properties ◽  
Polyaniline Composites

Schottky diodes based on 2D materials for environmental gas monitoring: a review on emerging trends, recent developments and future perspectives

2021 ◽  
Author(s):  
Minu Mathew ◽  
Chandra Sekhar Rout
Keyword(s):  
Gas Sensing ◽  
2D Materials ◽  
Schottky Diodes ◽  
High Sensitivity ◽  
Future Perspectives ◽  
Working Temperature ◽  
Emerging Trends ◽  
Gas Sensing Properties ◽  
Recent Developments ◽  
Sensitivity And Selectivity

This review details the fundamentals, working principles and recent developments of Schottky junctions based on 2D materials to emphasize their improved gas sensing properties including low working temperature, high sensitivity, and selectivity.

Preparation of One-dimensional Pt/SnO2 Nanofibers and NOx Gas-sensing Properties

2013 ◽  
Vol 28 (6) ◽  
pp. 584-588 ◽  
Author(s):  
Shuang XU ◽  
Ying YANG ◽  
Hong-Yuan WU ◽  
Chao JIANG ◽  
Li-Qiang JING ◽  
...  
Keyword(s):  
Gas Sensing ◽  
One Dimensional ◽  
Sensing Properties ◽  
Gas Sensing Properties

scholarly journals Enhancing Formaldehyde Selectivity of SnO2 Gas Sensors with the ZSM-5 Modified Layers

Sensors ◽  
2021 ◽  
Vol 21 (12) ◽  
pp. 3947
Author(s):  
Wei Wang ◽  
Qinyi Zhang ◽  
Ruonan Lv ◽  
Dong Wu ◽  
Shunping Zhang
Keyword(s):  
Gas Sensors ◽  
Indoor Air ◽  
High Performance ◽  
Screen Printing ◽  
Gas Sensing ◽  
Oxide Semiconductors ◽  
Screen Printing Method ◽  
Gas Sensing Properties ◽  
Zeolite Films ◽  
Insufficient Knowledge

High performance formaldehyde gas sensors are widely needed for indoor air quality monitoring. A modified layer of zeolite on the surface of metal oxide semiconductors results in selectivity improvement to formaldehyde as gas sensors. However, there is insufficient knowledge on how the thickness of the zeolite layer affects the gas sensing properties. In this paper, ZSM-5 zeolite films were coated on the surface of the SnO2 gas sensors by the screen printing method. The thickness of ZSM-5 zeolite films was controlled by adjusting the numbers of screen printing layers. The influence of ZSM-5 film thickness on the performance of ZSM-5/SnO2 gas sensors was studied. The results showed that the ZSM-5/SnO2 gas sensors with a thickness of 19.5 μm greatly improved the selectivity to formaldehyde, and reduced the response to ethanol, acetone and benzene at 350 °C. The mechanism of the selectivity improvement to formaldehyde of the sensors was discussed.

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