Ultrasensitive room temperature NH3 sensor based on a graphene–polyaniline hybrid loaded on PET thin film

2015 ◽  
Vol 51 (35) ◽  
pp. 7524-7527 ◽  
Author(s):  
Shouli Bai ◽  
Yangbo Zhao ◽  
Jianhua Sun ◽  
Ye Tian ◽  
Ruixian Luo ◽  
...  
Keyword(s):  
Thin Film ◽  
Room Temperature ◽  
Oxidative Polymerization ◽  
High Sensitivity ◽  
Fast Response ◽  
Chemical Oxidative Polymerization ◽  
Nh3 Sensor ◽  
First Time

A room temperature smart NH3 sensor based on rGO–PANI hybrid loading on flexible PET thin film prepared by in situ chemical oxidative polymerization is reported for the first time. The sensor not only exhibits high sensitivity, good selectivity and fast response but also has flexibility, is inexpensive and has wearable characteristics.

Ultra-sensitive polyaniline–iron oxide nanocomposite room temperature flexible ammonia sensor

RSC Advances ◽  
2015 ◽  
Vol 5 (84) ◽  
pp. 68964-68971 ◽  
Author(s):  
D. K. Bandgar ◽  
S. T. Navale ◽  
M. Naushad ◽  
R. S. Mane ◽  
F. J. Stadler ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Room Temperature ◽  
Oxidative Polymerization ◽  
Ammonia Sensor ◽  
Chemical Oxidative Polymerization ◽  
First Time ◽  
Polymerization Method ◽  
Pet Substrate

We report for the first time a room temperature smart NH3sensor based on PAni–Fe2O3nanocomposite loading on flexible PET substrate byin situchemical oxidative polymerization method.

Nanocoating of Polyaniline Layer on the Surface of Graphene Sheets for Ammonia Gas Detection

2012 ◽  
Vol 557-559 ◽  
pp. 1803-1806 ◽  
Author(s):  
Ya Meng Cai ◽  
Zong Yi Qin ◽  
Zhe Zhou
Keyword(s):  
Oxidative Polymerization ◽  
High Sensitivity ◽  
Fast Response ◽  
Thin Layers ◽  
Graphene Sheets ◽  
Ammonia Gas ◽  
Resistive Sensor ◽  
Response And Recovery ◽  
Nanocomposite Sensors

Polyaniline thin layers were successfully coated on the surface of graphene sheets through in situ chemical oxidative polymerization. By integrating into a resistive sensor design, the sensing properties of the nanocomposites were evaluated. It is found that the nanocomposite sensors exhibited high sensitivity with fast response and recovery time, and good reproducibility charactics for ammonia gas at room temperature even exposed to low concentration of 10 ppm, implying that the nanocomposite could be a promising candidate as a gas sensor for ammonia gas.

Well-Defined Blackberry-Like Polypyrrole Microspheres via Chemical Oxidative Polymerization in the Presence of Functional Floating Bead as In Situ Dopant

2014 ◽  
Vol 904 ◽  
pp. 159-163 ◽  
Author(s):  
Jia Ping Lao ◽  
Chao Yang ◽  
Hao Dao Mo ◽  
Yu Ping Li ◽  
Li Min Zang ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Electrical Conductivity ◽  
Sulfonic Acid ◽  
Room Temperature ◽  
Oxidative Polymerization ◽  
High Electrical Conductivity ◽  
Chemical Oxidative Polymerization ◽  
Inorganic Substrate ◽  
Thermal Stability Of

Functional floating bead (F-FB), prepared by anchoring the organic sulfonic acid on the surface of the blackberry-like structural FB, was used as both the inorganic substrate and the in situ dopant for the in situ chemical oxidative polymerization of pyrrole to obtain the plypyrrole/functional floating bead (PPy/F-FB) nanocomposite material. The composites possess high electrical conductivity at room temperature. Thermogravimetric analysis shows that the thermal stability of PPy/F-FB composites was enhanced and these can be attributed to the retardation effect of sulfonic acid-functionalized FB as barriers for the degradation of PPy. The morphology of PPy/FB composites showed the well-defined blackberry-like morphology.

Non-covalent functionalization of CNTs with polycarbazole: a chemiresistive humidity sensor with tunable chemo-electric attributes at room temperature

2018 ◽  
Vol 42 (9) ◽  
pp. 6918-6931 ◽  
Author(s):  
Madhurima Das ◽  
Saptarshi Ghosh ◽  
Somenath Roy
Keyword(s):  
Room Temperature ◽  
Humidity Sensor ◽  
Oxidative Polymerization ◽  
Multiwall Carbon Nanotubes ◽  
Chemical Oxidative Polymerization ◽  
Humidity Sensors ◽  
Covalent Functionalization ◽  
Polymerization Method ◽  
Multiwall Carbon

This article describes the non-covalent functionalization of multiwall carbon nanotubes (MWCNTs) with polycarbazole (PCz) via an in situ chemical oxidative polymerization method and subsequent fabrication of resistive humidity sensors.

Fast-Response X-ray Detector Based on Nanocrystalline Ga2O3 Thin Film Prepared at Room Temperature

2021 ◽  
pp. 149619
Author(s):  
Manni Chen ◽  
Zhipeng Zhang ◽  
Runze Zhan ◽  
Juncong She ◽  
Shaozhi Deng ◽  
...  
Keyword(s):  
Thin Film ◽  
Room Temperature ◽  
Fast Response ◽  
X Ray ◽  
Ga2o3 Thin Film

Zinc Oxide/Polyaniline Transparent Conductive Film Prepared by In Situ Polymerization Deposition

2014 ◽  
Vol 997 ◽  
pp. 368-370
Author(s):  
Ping Zhong ◽  
Lin Xiu Cheng ◽  
Xing Lu
Keyword(s):  
Zinc Oxide ◽  
Oxidative Polymerization ◽  
Optimal Conditions ◽  
Chemical Oxidative Polymerization ◽  
Reaction Conditions ◽  
Transparent Conductive Film ◽  
Conductive Film

In this paper，ZnO/PANI transparent conductive film has been prepared by in situ chemical oxidative polymerization, APS as an oxidant. The conductivity and transmittance of ZnO/PANI was measured. It has been investigated of the effects of reaction conditions and the doping component on conductivity, transmissivity and adhesion. With the increase of doping ZnO, the conductivity of ZnO/PANI transparent conductive film, transmittance and adhesion reduced. The optimal conditions is that the concentration of An, APS and PVA are 0.75 mol / L, 0.8 mol / L and 0.5wt%, respectively.

scholarly journals A Novel Trace-Level Ammonia Gas Sensing Based on Flexible PAni-CoFe2O4 Nanocomposite Film at Room Temperature

Polymers ◽  
2021 ◽  
Vol 13 (18) ◽  
pp. 3077
Author(s):  
Rima D. Alharthy ◽  
Ahmed Saleh
Keyword(s):  
Room Temperature ◽  
Gas Sensing ◽  
Oxidative Polymerization ◽  
Portable Devices ◽  
Trace Level ◽  
Humidity Effect ◽  
Sensor Performance ◽  
Wearable Electronic ◽  
Relative Humidity Effect

In this study, we developed a new chemi-resistive, flexible and selective ammonia (NH3) gas sensor. The sensor was prepared by depositing thin film of polyaniline-cobalt ferrite (PAni-CoFe2O4) nanocomposite on flexible polyethylene terephthalate (PET) through an in situ chemical oxidative polymerization method. The prepared PAni-CoFe2O4 nanocomposite and flexible PET-PAni-CoFe2O4 sensor were evaluated for their thermal stability, surface morphology and materials composition. The response to NH3 gas of the developed sensor was examined thoroughly in the range of 1–50 ppm at room temperature. The sensor with 50 wt% CoFe2O4 NPs content showed an optimum selectivity to NH3 molecules, with a 118.3% response towards 50 ppm in 24.3 s response time. Furthermore, the sensor showed good reproducibility, ultra-low detection limit (25 ppb) and excellent flexibility. In addition, the relative humidity effect on the sensor performance was investigated. Consequently, the flexible PET-PAni-CoFe2O4 sensor is a promising candidate for trace-level on-site sensing of NH3 in wearable electronic or portable devices.

scholarly journals A Novel Type Room Temperature Surface Photovoltage Gas Sensor Device 

2018 ◽  
Author(s):  
Monika Kwoka ◽  
Michal A. Borysiewicz ◽  
Pawel Tomkiewicz ◽  
Anna Piotrowska ◽  
Jacek Szuber
Keyword(s):  
Gas Sensor ◽  
Room Temperature ◽  
Gas Sensing ◽  
Signal To Noise Ratio ◽  
High Sensitivity ◽  
Fast Response ◽  
Surface Photovoltage ◽  
Kelvin Probe ◽  
Sensor Device ◽  
Developed Surface

In this paper a novel type of a highly sensitive gas sensor device based on the surface photovoltage effect is described. The developed surface photovoltage gas sensor is based on a reverse Kelvin probe approach. As the active gas sensing electrode the porous ZnO nanostructured thin films are used deposited by the direct current (DC) reactive magnetron sputtering method exhibiting the nanocoral surface morphology combined with an evident surface nonstoichiometry related to the unintentional surface carbon and water vapor contaminations. Among others, the demonstrated SPV gas sensor device exhibits a high sensitivity of 1 ppm to NO2 with a signal to noise ratio of about 50 and a fast response time of several seconds under the room temperature conditions.

Inter-Pulse Spectroscopy Based on Room-Temperature Pulsed Quantum-Cascade Laser for N2O Detection

2011 ◽  
Vol 128-129 ◽  
pp. 607-610
Author(s):  
Min Wang ◽  
Jie Chen ◽  
Niu Liu ◽  
Ya Wang
Keyword(s):  
Absorption Spectrum ◽  
Room Temperature ◽  
Single Point ◽  
High Sensitivity ◽  
Fast Response ◽  
Trace Gas ◽  
High Resolution Spectrum ◽  
Light Sources ◽  
Quantum Cascade ◽  
Pulse Spectroscopy

Mid-infrared lasers are very suitable for high-sensitive trace-gases detection for their wavelengths cover the fundamental absorption lines of most gases. Quantum-cascade (QC) lasers have been demonstrated to be ideal light sources with its special power, tuning and capability of operating in room-temperature. All these merits make it appropriate for the high resolution spectrum analysis. The absorption spectrum monitoring technology based on the QC laser pulsed operating in the room temperature, combining with the strong absorption of the gas molecule in the basic frequency, has become an effective way to monitor the trace gas with the characteristic of high sensitivity, good selectivity and fast response. In this paper, the inter-pulse spectroscopy based on a room-temperature distributed-feedback pulsed QC laser was introduced. Our approach to trace gas monitoring with QC lasers relies on short current pulses which are designed to produce even shorter light pulses. Each pulse corresponds to a single point in a spectrum. The N2O absorption spectrum centered at 2178.2cm-1was also obtained.

scholarly journals Synthesis and Physical Characterization of Carbon Nanotubes Coated by Conducting Polypyrrole

2011 ◽  
Vol 364 ◽  
pp. 50-54 ◽  
Author(s):  
Afarin Bahrami ◽  
Z.A. Talib ◽  
W. Mahmood Mat Yunus ◽  
Kasra Behzad ◽  
Nayereh Soltani
Keyword(s):  
Carbon Nanotubes ◽  
Oxidative Polymerization ◽  
Feed Ratio ◽  
Multiwall Carbon Nanotube ◽  
Chemical Oxidative Polymerization ◽  
Conducting Polypyrrole ◽  
Multiwall Carbon ◽  
Thermal Stability Of

This study describes the preparation of polypyrrole multiwall carbon nanotube (PPy/MWNT) composites by in situ chemical oxidative polymerization. Various ratios of functionalized MWNTs are dispersed in the water, and PPy are then synthesized via in-situ chemical oxidative polymerization on the surface of the carbon nanotubes. The morphology of the resulting complex nanotubes (MWNT-PPY) was characterized by field-emission scanning electron microscopy (FESEM). The conductivity of each composite showed a maximum in the temperature scale of 120 – 160 °C and then decreased dramatically with the increase of temperature. The resultant PPy/MWNT nanotubes enhanced electrical conductivity and thermal stability of nanocomposite compared to PPy which was strongly influenced by the feed ratio of pyrrole to MWNTs.

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