Snowflake-Shaped ZnO Nanostructures-Based Gas Sensor for Sensitive Detection of Volatile Organic Compounds

Volatile organic compounds (VOCs) have been considered severe risks to human health. Gas sensors for the sensitive detection of VOCs are highly required. However, the preparation of gas-sensing materials with a high gas diffusion performance remains a great challenge. Here, through a simple hydrothermal method accompanied with a subsequent thermal treatment, a special porous snowflake-shaped ZnO nanostructure was presented for sensitive detection of VOCs including diethyl ether, methylbenzene, and ethanol. The fabricated gas sensors exhibit a good sensing performance including high responses to VOCs and a short response/recovery time. The responses of the ZnO-based gas sensor to 100 ppm ethanol, methylbenzene, and diethyl ether are about 27, 21, and 11, respectively, while the response times to diethyl ether and methylbenzene are less than 10 seconds. The gas adsorption-desorption kinetics is also investigated, which shows that the gas-sensing behaviors to different target gases are remarkably different, making it possible for target recognition in practical applications.

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

Sensors ◽

10.3390/s21020440 ◽

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.

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

RSC Advances ◽

10.1039/c6ra23780k ◽

2016 ◽

Vol 6 (103) ◽

pp. 101304-101312 ◽

Cited By ~ 11

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.

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

Reviews in Analytical Chemistry ◽

10.1515/revac-2021-0127 ◽

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.

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

Journal of Materials Chemistry C ◽

10.1039/d1tc01510a ◽

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....

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Metal-Organic Frameworks for Advanced Transducers based Gas Sensors: Review and Perspectives

Nanoscale Advances ◽

10.1039/d1na00798j ◽

2022 ◽

Author(s):

Sanjit Manohar Majhi ◽

Ashraf Ali ◽

Prabhakar Rai ◽

Yaser Greish ◽

Ahmed Alzamly ◽

...

Keyword(s):

Volatile Organic Compounds ◽

Organic Compounds ◽

Gas Sensors ◽

Gas Sensing ◽

Metal Organic Frameworks ◽

The Past ◽

Volatile Organic ◽

Metal Organic

The development of gas sensing devices to detect environmentally toxic, hazardous, and volatile organic compounds (VOCs) has witnessed a surge of immense interest over the past few decades, motivated mainly...

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A Highly Efficient Volatile Organic Compounds Gas Sensor Based on Molybdenum Oxide Applied in Air Detection Inside Vehicles

Journal of Nanoelectronics and Optoelectronics ◽

10.1166/jno.2021.3047 ◽

2021 ◽

Vol 16 (6) ◽

pp. 993-997

Author(s):

Jinying Zhou ◽

Yan Liu ◽

Lei Xu ◽

Jun Long

Keyword(s):

Volatile Organic Compounds ◽

Gas Sensor ◽

Organic Compounds ◽

Gas Sensing ◽

Structural Features ◽

X Ray Diffraction ◽

Sensing Material ◽

Highly Sensitive ◽

Volatile Organic ◽

Promising Application

Volatile organic compounds (VOCs) are the major air pollutants inside vehicles. In this research, a highly sensitive gas sensor was developed based on an excellent sensing material and explored for VOCs sensing application. The X-ray diffraction and scanning electron microscopy were performed to evaluate the detailed structural features of sensing material. From the gas-sensing property tests to the three representative VOCs vapors, containing xylene, toluene and formaldehyde, the gas sensor fabricated from the exceptional sensing material significantly responses to the three VOCs vapors. In particular, the xylene response of the sensor is slightly larger than the other two gas response. Thus, the fabricated sensor could be a promising application for VOCs detection inside vehicles.

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