scholarly journals Silver Enhances Hematite Nanoparticles Based Ethanol Sensor Response and Selectivity at Room Temperature

Sensors ◽  
2021 ◽  
Vol 21 (2) ◽  
pp. 440
Author(s):  
Daniel Garcia-Osorio ◽  
Pilar Hidalgo-Falla ◽  
Henrique E. M. Peres ◽  
Josue M. Gonçalves ◽  
Koiti Araki ◽  
...  
Keyword(s):  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Gas Sensors ◽  
Room Temperature ◽  
Gas Sensing ◽  
Ethanol Vapor ◽  
Oxide Semiconductor ◽  
Charge Carrier Density ◽  
Ethanol Sensor ◽  
Volatile Organic

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.

Ag-Functionalized macro-/mesoporous AZO synthesized by solution combustion for VOCs gas sensing application

RSC Advances ◽  
2016 ◽  
Vol 6 (103) ◽  
pp. 101304-101312 ◽  
Author(s):  
Xinxin Xing ◽  
Yuxiu Li ◽  
Dongyang Deng ◽  
Nan Chen ◽  
Xu Liu ◽  
...  
Keyword(s):  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Gas Sensors ◽  
Gas Sensing ◽  
Solution Combustion ◽  
Highly Sensitive ◽  
Volatile Organic ◽  
Sensing Application

The aim of this paper is to develop easily manufactured and highly sensitive gas sensors for VOCs (volatile organic compounds) detection.

Fabrication and Application of Thin Film Semiconductor Sensors for the Detection of Volatile Organic Compounds

2013 ◽  
Vol 665 ◽  
pp. 85-92 ◽  
Author(s):  
V.S. Vaishnav ◽  
S.G. Patel ◽  
J.N. Panchal
Keyword(s):  
Thin Film ◽  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Gas Sensors ◽  
Vital Role ◽  
Oxide Semiconductor ◽  
Volatile Organic ◽  
Direct Sensing ◽  
Evaporation Technique ◽  
The Stability

Volatile Organic Compounds (VOCs) are highly reactive, often mixed with interfering gases and more importantly, their vapours in the gaseous form respond to the gas sensor devices. Oxide semiconductor based thin film gas sensors play vital role in detecting, monitoring and controlling the presence of hazardous and harmful gases in the environment at very low concentration and hence are tested for the detection of harmful or industrially important VOCs. The demand of sensitive as well stable gas/vapour sensors for direct sensing application has increased the importance of In2O3:SnO2 based semiconductor materials. The paper presents the fabrication aspects of thin film gas sensors based on x1In2O3:x2SnO2 compound and also their application for the detection of some important volatile organic compounds. Thin films of x1In2O3:x2SnO2 were deposited using Thermal Evaporation technique and under the optimized fabrication conditions, the vapour sensors were prepared and mounted on the proper contact jig. Their response to the presence of Volatile Organic Compounds like CCl4 was examined. The stability, the sensitivity and the response time of the sensors were studied for the different concentrations of test vapours.

scholarly journals SnO2 Nanostructured Thin Films for Room-Temperature Gas Sensing of Volatile Organic Compounds

2018 ◽  
Vol 10 (35) ◽  
pp. 29972-29981 ◽  
Author(s):  
Kelsey Haddad ◽  
Ahmed Abokifa ◽  
Shalinee Kavadiya ◽  
Byeongdu Lee ◽  
Sriya Banerjee ◽  
...  
Keyword(s):  
Thin Films ◽  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Room Temperature ◽  
Gas Sensing ◽  
Nanostructured Thin Films ◽  
Volatile Organic

Zeolite Modified Vanadium Pentoxide Sensors for the Selective Detection of Volatile Organic Compounds

MRS Advances ◽  
2016 ◽  
Vol 1 (49) ◽  
pp. 3349-3354 ◽  
Author(s):  
David C. Pugh ◽  
Ivan P. Parkin
Keyword(s):  
Machine Learning ◽  
Volatile Organic Compounds ◽  
Metal Oxide ◽  
Organic Compounds ◽  
Gas Sensors ◽  
Vanadium Pentoxide ◽  
Zeolite Y ◽  
Oxide Semiconductor ◽  
Central Nervous System Damage ◽  
Volatile Organic

ABSTRACTExposure to volatile organic compounds can lead to asphyxiation, pneumonia like conditions, comas, seizures and irreversible lung, kidney and central nervous system damage. Volatile organics are additionally extremely flammable and explosive, making their early detection in the immediate environment increasingly important. Metal oxide semiconductor (MOS) gas sensors present a potential technology to detect such gases.Metal oxide semiconducting (MOS) gas sensors represent a cheap, robust and sensitive technology for detecting volatile organic compounds. An array of five thick film MOS gas sensors was fabricated, based on vanadium pentoxide inks. Production took place using a commercially available screen printer, a 3 x 3 mm alumina substrate containing interdigitated electrodes and a platinum heater track. V2O5inks were modified using zeolite beta, zeolite Y, mordenite & ZSM5 admixtures. Sensors were exposed to three common reducing gases, namely acetone, ethanol, and toluene, and a machine learning technique was applied to differentiate between the different gases. Sensors produced strong responses to all gases. Zeolite modified sensors were found to increase the responsiveness of the sensors compared to umodified V2O5in a number of cases. Machine learning techniques were incorporated to test the selectivity of the sensors. A high level of accuracy was achieved in determining the class of gas observed.

scholarly journals Detection of volatile organic compounds: From chemical gas sensors to terahertz spectroscopy

2021 ◽  
Vol 40 (1) ◽  
pp. 33-57
Author(s):  
Vardan Galstyan ◽  
Annalisa D’Arco ◽  
Marta Di Fabrizio ◽  
Nicola Poli ◽  
Stefano Lupi ◽  
...  
Keyword(s):  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Gas Sensors ◽  
High Performance ◽  
Gas Sensing ◽  
Terahertz Spectroscopy ◽  
Monitoring Systems ◽  
Exhaled Breath ◽  
Volatile Organic ◽  
Chemiresistive Gas Sensors

Abstract Volatile organic compounds are released by different sources causing air pollution. Moreover, some of these carbon-based organic chemicals are considered as biomarkers in the exhaled breath of individuals and can be used to identify various kinds of diseases. Hence, the increasing demand to control air quality and human health has promoted the development of monitoring systems based on high-performance gas sensing structures. This review highlights the achievements in sensing technologies for the detection of volatile organic compounds. Particularly, chemiresistive gas sensors and detection systems based on the terahertz spectroscopy method are outlined. The progress in research studies is discussed and the potential of both techniques is evaluated considering the current challenges. Afterward, a brief summary is also provided along with the advances and issues for future investigations and the manufacturing of highly sensitive and selective monitoring systems.

Pt-decorated Phosphorene as a Propitious Room Temperature VOCs Gas Sensor for Sensitive and Selective Detection of Alcohols

2021 ◽  
Author(s):  
Aref Aasi ◽  
Sadegh Mehdi Aghaei ◽  
Balaji Panchapakesan
Keyword(s):  
Volatile Organic Compounds ◽  
Gas Sensor ◽  
Organic Compounds ◽  
Gas Sensors ◽  
Room Temperature ◽  
Selective Detection ◽  
Two Dimensional ◽  
Black Phosphorene ◽  
Volatile Organic ◽  
Gas Molecules

Inspired by prior advancements and the growing utilization of two-dimensional (2D) based gas sensors, this work presents the potential of black phosphorene for sensing volatile organic compounds (VOCs) gas molecules....

Study of Gas Sensors for the Detection of Volatile Organic Compounds in Breath

2014 ◽  
Vol 573 ◽  
pp. 785-790 ◽  
Author(s):  
T. Jayasree ◽  
S. Muttan
Keyword(s):  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Gas Sensors ◽  
Tin Oxide ◽  
Oxide Semiconductor ◽  
Prototype Model ◽  
Renal Disorder ◽  
Volatile Organic ◽  
Semiconductor Gas Sensors ◽  
High Vapour Pressure

Volatile organic compounds (VOCs) are organic chemicals that encompass a high vapour pressure .The VOCs are numerous and varied. In breath the concentration of VOCs ranges from parts per million to parts per trillion. The discovery of VOCs in breath is used as a diagnostic tool for many diseases, disorders and metabolic studies. So far these gases have been identified using gas chromatography (GC) which is time consuming and expensive technique. With the introduction of sensors as frontend to detect vapour signals, the work can be processed easier. This article proposes a system for breath analysis using tin oxide semiconductor gas sensors, in which the conductivity changes depending on the concentration of the vapour. A prototype model was developed to detect the presence of acetone in the breath, which is a biomarker for diabetes mellitus. This study has been helpful in designing an electronic nose for detecting other vapours like benzene, ammonia and Nitric oxide which are the biomarkers for lung cancer, renal disorder and asthmatic inflammation.

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