Investigation of the electrical conductivity and optical property of polyaniline-based nanocomposite and its application as an ethanol vapor sensor

Gas sensors are fundamental for continuous online monitoring of volatile organic compounds. Gas sensors based on semiconductor materials have demonstrated to be highly competitive, but are generally made of expensive materials and operate at high temperatures, which are drawbacks of these technologies. Herein is described a novel ethanol sensor for room temperature (25 °C) measurements based on hematite (α‑Fe2O3)/silver nanoparticles. The AgNPs were shown to increase the oxide semiconductor charge carrier density, but especially to enhance the ethanol adsorption rate boosting the selectivity and sensitivity, thus allowing quantification of ethanol vapor in 2–35 mg L−1 range with an excellent linear relationship. In addition, the α-Fe2O3/Ag 3.0 wt% nanocomposite is cheap, and easy to make and process, imparting high perspectives for real applications in breath analyzers and/or sensors in food and beverage industries. This work contributes to the advance of gas sensing at ambient temperature as a competitive alternative for quantification of conventional volatile organic compounds.

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Fabrication of Ethanol Sensor Based on a Calixarene Derivative Coated Piezoelectric Quartz Crystal

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.139-141.2262 ◽

2010 ◽

Vol 139-141 ◽

pp. 2262-2265

Author(s):

Yun Lin Dai ◽

Zhong Cao ◽

Yi Min Dai ◽

Ju Lan Zeng ◽

Wei Gang Huang ◽

...

Keyword(s):

Quartz Crystal ◽

Practical Purpose ◽

Gold Surface ◽

Ethanol Vapor ◽

Ethanol Sensor ◽

Recognition Mechanism ◽

Piezoelectric Quartz ◽

Calixarene Derivative ◽

On Line ◽

Piezoelectric Quartz Crystal

Coating with a calixarene derivative on gold surface of AT-cut quartz crystal, a piezoelectric quartz crystal (PQC) sensing device was successfully fabricated in this paper. Among four calixarene materials, the compound of MRCT was the most efficient actively coating material for recognizing ethanol molecule based on a host-guest recognition mechanism with C—H•••π interaction. In comparison with gas-chromatography (GC) method, the calixarene based PQC device can be well used for on-line detection of the ethanol vapor in the range of 0 ~ 3000 ppm around our environment with a recovery of 92.33~105.76 %. The detection limit can be evaluated to be 3.53 ppm. Furthermore, the proposed TSM sensor possessed good selectivity, reproducibility, reversibility and high stability for practical purpose.

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Synthesis of Ag3PO4 Crystals with Tunable Shapes for Facet-Dependent Optical Property, Photocatalytic Activity, and Electrical Conductivity Examinations

ACS Applied Materials & Interfaces ◽

10.1021/acsami.7b13941 ◽

2017 ◽

Vol 9 (44) ◽

pp. 39086-39093 ◽

Cited By ~ 45

Author(s):

Meng-Shan Hsieh ◽

Huang-Jen Su ◽

Pei-Lun Hsieh ◽

Yun-Wei Chiang ◽

Michael H. Huang

Keyword(s):

Electrical Conductivity ◽

Photocatalytic Activity ◽

Optical Property

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Preparation of Thermosensitive Conducting PANI@P(St-NIPAm) Composite Particles and Conductivity Properties

Materials Science Forum ◽

10.4028/www.scientific.net/msf.996.29 ◽

2020 ◽

Vol 996 ◽

pp. 29-34

Author(s):

Qiang Zhang ◽

Meng Hao Li ◽

Ru Xiu Wang ◽

Jia Jia Song ◽

Bin Wang ◽

...

Keyword(s):

Electrical Conductivity ◽

Composite Particles ◽

Particle Sizes ◽

Conducting Composite ◽

Conducting Polyaniline ◽

Different Temperatures

Thermosensitive conducting composite particles were synthesized using the unsulfonated P(St-NIPAm) as a thermosensitive substrate. A series of characterizations have been performed to study the effects of thermosensitive PANI@poly (St-NIPAm) conductivity performance. Aniline diffused into P(St-NIPAm) particles in solution, and then polyaniline (PANI) was in-situ produced in P(St-NIPAm) particles through oxidation polymerization. The samples showed different particle sizes at different temperatures. The content of conducting polyaniline is dependent on NIPAm feed ratios. The particle electrical conductivity was improved with the increasing NIPAM feed ratios and exhibited thermal responsive electrical conductivity. The thermosensitive conducting composite particles will have wide applications in sensors, for example, they could be used to fabricate smart conductive gel responsive to temperature and moisture.

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Effect of Ag on the ZnO nanoparticles properties as an ethanol vapor sensor

Materials Science in Semiconductor Processing ◽

10.1016/j.mssp.2020.105172 ◽

2020 ◽

Vol 117 ◽

pp. 105172 ◽

Cited By ~ 6

Author(s):

Hamid Reza Yousefi ◽

Babak Hashemi ◽

Ali Mirzaei ◽

Hossein Roshan ◽

Mohammad Hossein Sheikhi

Keyword(s):

Zno Nanoparticles ◽

Ethanol Vapor ◽

Vapor Sensor

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Electrical conductivity response and sensitivity of ZSM-5, Y, and mordenite zeolites towards ethanol vapor

Ionics ◽

10.1007/s11581-011-0545-3 ◽

2011 ◽

Vol 17 (7) ◽

pp. 607-615 ◽

Cited By ~ 20

Author(s):

Intira Yimlamai ◽

Sumonman Niamlang ◽

Pojjawan Chanthaanont ◽

Ruksapong Kunanuraksapong ◽

Sairung Changkhamchom ◽

...

Keyword(s):

Electrical Conductivity ◽

Ethanol Vapor

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Scotch Tape Optical Vapor Sensor for Ethanol–Methanol Mixtures

Sensors ◽

10.3390/s19245381 ◽

2019 ◽

Vol 19 (24) ◽

pp. 5381 ◽

Cited By ~ 2

Author(s):

Carlos Angulo Barrios

Keyword(s):

Optical Power ◽

Ethanol Vapor ◽

Liquid Mixtures ◽

Adhesive Tape ◽

Vapor Sorption ◽

Methanol Vapor ◽

Detection Range ◽

Linear Detection ◽

Volatile Organic ◽

Vapor Sensor

A simple optical vapor sensor based on conventional Scotch adhesive tape, for analyzing ethanol–methanol mixtures, is proposed and demonstrated. The sensing signal relies on the variation of optical power transmitted through the tape, resulting from the response of the adhesive material to vapor sorption. The optical sensor exhibits high selectivity for ethanol vapor over methanol vapor. When exposed to vapors from ethanol–methanol liquid mixtures, the sensor shows a linear detection range of 0–100 vol%, and detection limits of 8.8 vol% ethanol and 17.6 vol% methanol. Repeatability, reproducibility, reversibility, and sensitivity to other volatile organic compounds are also studied.

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An Ethanol Vapor Sensor Based on a Microfiber with a Quantum-Dot Gel Coating

Sensors ◽

10.3390/s19020300 ◽

2019 ◽

Vol 19 (2) ◽

pp. 300 ◽

Cited By ~ 2

Author(s):

Siqi Hu ◽

Guofeng Yan ◽

Chunzhou Wu ◽

Sailing He

Keyword(s):

Quantum Dot ◽

Low Cost ◽

Temperature Response ◽

High Sensitivity ◽

Ethanol Vapor ◽

Fast Response ◽

Cost System ◽

Sensing Applications ◽

Vapor Sensor ◽

Ethanol Sensing

An ethanol vapor sensor based on a microfiber with a quantum-dot (QD) gel coating is proposed and demonstrated. The QD gel was made from UV glue as the gel matrix and CdSe/ZnS QDs with a concentration of 1 mg/mL. The drawing and coating processes were conducted by using a simple and low-cost system developed for this study. Bending, ethanol sensing, temperature response, and time response tests were carried out, respectively. The experimental results showed that the fabricated sensor had a high sensitivity of −3.3%/ppm, a very low temperature cross-sensitivity of 0.17 ppm/°C, and a fast response time of 1.1 s. The easily fabricated robust structure and the excellent sensing performance render the sensor a promising platform for real ethanol sensing applications.

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