In situ synthesis of porous array films on a filament induced micro-gap electrode pair and their use as resistance-type gas sensors with enhanced performances

Nanoscale ◽  
2015 ◽  
Vol 7 (34) ◽  
pp. 14264-14271 ◽  
Author(s):  
Zongke Xu ◽  
Guotao Duan ◽  
Hongwen Zhang ◽  
Yingying Wang ◽  
Lei Xu ◽  
...  
Keyword(s):  
Metal Oxide ◽  
Gas Sensor ◽  
Gas Sensors ◽  
Model Material ◽  
In Situ Synthesis ◽  
Electrode Pair ◽  
Porous Array

In this paper, a new gas sensor of metal-oxide porous array films on a micro-gap electrode pair is designed and implemented by taking ZnO as a model material.

Metal-oxide based ammonia gas sensors: A review

2020 ◽  
Vol 10 ◽  
Author(s):  
Priya Gupta ◽  
Savita Maurya ◽  
Narendra Kumar Pandey ◽  
Vernica Verma
Keyword(s):  
Metal Oxide ◽  
Metal Oxides ◽  
Gas Sensor ◽  
Gas Sensors ◽  
Review Paper ◽  
Gas Sensing ◽  
Gas Sensitivity ◽  
Ammonia Gas ◽  
Ammonia Sensing ◽  
Ammonia Gas Sensors

: This review paper encompasses a study of metal-oxide and their composite based gas sensors used for the detection of ammonia (NH3) gas. Metal-oxide has come into view as an encouraging choice in the gas sensor industry. This review paper focuses on the ammonia sensing principle of the metal oxides. It also includes various approaches adopted for increasing the gas sensitivity of metal-oxide sensors. Increasing the sensitivity of the ammonia gas sensor includes size effects and doping by metal or other metal oxides which will change the microstructure and morphology of the metal oxides. Different parameters that affect the performances like sensitivity, stability, and selectivity of gas sensors are discussed in this paper. Performances of the most operated metal oxides with strengths and limitations in ammonia gas sensing application are reviewed. The challenges for the development of high sensitive and selective ammonia gas sensor are also discussed.

scholarly journals Field Study of Metal Oxide Semiconductor Gas Sensors in Temperature Cycled Operation for Selective VOC Monitoring in Indoor Air

Atmosphere ◽  
2021 ◽  
Vol 12 (5) ◽  
pp. 647
Author(s):  
Tobias Baur ◽  
Johannes Amann ◽  
Caroline Schultealbert ◽  
Andreas Schütze
Keyword(s):  
Air Quality ◽  
Metal Oxide ◽  
Gas Sensor ◽  
Gas Sensors ◽  
Indoor Air ◽  
Ambient Air ◽  
Quantitative Agreement ◽  
Metal Oxide Semiconductor ◽  
Oxide Semiconductor ◽  
High Temporal Resolution

More and more metal oxide semiconductor (MOS) gas sensors with digital interfaces are entering the market for indoor air quality (IAQ) monitoring. These sensors are intended to measure volatile organic compounds (VOCs) in indoor air, an important air quality factor. However, their standard operating mode often does not make full use of their true capabilities. More sophisticated operation modes, extensive calibration and advanced data evaluation can significantly improve VOC measurements and, furthermore, achieve selective measurements of single gases or at least types of VOCs. This study provides an overview of the potential and limits of MOS gas sensors for IAQ monitoring using temperature cycled operation (TCO), calibration with randomized exposure and data-based models trained with advanced machine learning. After lab calibration, a commercial digital gas sensor with four different gas-sensitive layers was tested in the field over several weeks. In addition to monitoring normal ambient air, release tests were performed with compounds that were included in the lab calibration, but also with additional VOCs. The tests were accompanied by different analytical systems (GC-MS with Tenax sampling, mobile GC-PID and GC-RCP). The results show quantitative agreement between analytical systems and the MOS gas sensor system. The study shows that MOS sensors are highly suitable for determining the overall VOC concentrations with high temporal resolution and, with some restrictions, also for selective measurements of individual components.

In-situ synthesis of metal oxide and polymer decorated activated carbon-based photocatalyst for organic pollutants degradation

2022 ◽  
pp. 120380
Author(s):  
Amar R. Singh ◽  
Pratik S. Dhumal ◽  
Madhuri Bhakare ◽  
Kshama D. Lokhande ◽  
Mahesh P. Bondarde ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Metal Oxide ◽  
Organic Pollutants ◽  
In Situ Synthesis ◽  
Carbon Based

scholarly journals SPM—SEM Investigations of Semiconductor Nanowires for Integrated Metal Oxide Gas Sensors

Proceedings ◽  
2018 ◽  
Vol 2 (13) ◽  
pp. 701 ◽  
Author(s):  
Verena Leitgeb ◽  
Katrin Fladischer ◽  
Frank Hitzel ◽  
Florentyna Sosada-Ludwikowska ◽  
Johanna Krainer ◽  
...  
Keyword(s):  
Electron Beam ◽  
Metal Oxide ◽  
Gas Sensor ◽  
Gas Sensors ◽  
Semiconductor Nanowires ◽  
Kelvin Probe ◽  
Sensor Applications ◽  
Sensitivity And Selectivity ◽  
Stable Performance ◽  
Metal Oxide Gas Sensors

Integration of metal oxide nanowires in metal oxide gas sensors enables a new generation of gas sensor devices, with increased sensitivity and selectivity. For reproducible and stable performance of next generation sensors, the electric properties of integrated nanowires have to be well understood, since the detection principle of metal oxide gas sensors is based on the change in electrical conductivity during gas exposure. We study two different types of nanowires that show promising properties for gas sensor applications with a Scanning Probe Microscope—Scanning Electron Microscope combination. Electron Beam Induced Current and Kelvin Probe Force Microscopy measurements with a lateral resolution in the nanometer regime are performed. Our work offers new insights into the dependence of the nanowire work function on its composition and size, and into the local interaction between electron beam and semiconductor nanowires.

In-Situ Analysis of Volatile Organic Compounds in Biogas Fermentation Processes Using a Metal Oxide Gas Sensor Array

2020 ◽  
Vol MA2020-01 (28) ◽  
pp. 2153-2153
Author(s):  
Binayak Ojha ◽  
Divyashree Narayana ◽  
Margarita Aleksandrova ◽  
Heinz Kohler ◽  
Matthias Schwotzer ◽  
...  
Keyword(s):  
Volatile Organic Compounds ◽  
Metal Oxide ◽  
Gas Sensor ◽  
Organic Compounds ◽  
Sensor Array ◽  
Fermentation Processes ◽  
Gas Sensor Array ◽  
Volatile Organic ◽  
Metal Oxide Gas Sensor

Enhanced selectivity of target gas molecules through a minimal array of gas sensors based on nanoparticle-decorated SWCNTs

The Analyst ◽  
2019 ◽  
Vol 144 (13) ◽  
pp. 4100-4110 ◽  
Author(s):  
Sonia Freddi ◽  
Giovanni Drera ◽  
Stefania Pagliara ◽  
Andrea Goldoni ◽  
Luigi Sangaletti
Keyword(s):  
Metal Oxide ◽  
Gas Sensor ◽  
Gas Sensors ◽  
Metal Oxide Nanoparticles ◽  
Sensor Arrays ◽  
Oxide Nanoparticles ◽  
Gas Molecules ◽  
Enhanced Selectivity ◽  
Gas Sensor Arrays

Layers of CNTs decorated with metal and metal–oxide nanoparticles can be used to develop highly selective gas sensor arrays.

Graphene sheets decorated with SnO2 nanoparticles: in situ synthesis and highly efficient materials for cataluminescence gas sensors

2011 ◽  
Vol 21 (16) ◽  
pp. 5972 ◽  
Author(s):  
Hongjie Song ◽  
Lichun Zhang ◽  
Chunlan He ◽  
Ying Qu ◽  
Yunfei Tian ◽  
...  
Keyword(s):  
Gas Sensors ◽  
Sno2 Nanoparticles ◽  
In Situ Synthesis ◽  
Graphene Sheets ◽  
Highly Efficient

scholarly journals Metal/Metal-Oxide Nanoclusters for Gas Sensor Applications

2016 ◽  
Vol 2016 ◽  
pp. 1-17 ◽  
Author(s):  
Ahmad I. Ayesh
Keyword(s):  
Metal Oxide ◽  
Gas Sensor ◽  
Gas Sensors ◽  
Recent Progress ◽  
Volume Ratio ◽  
Building Blocks ◽  
Special Focus ◽  
Gaseous Species ◽  
Sensor Applications ◽  
Metal Metal

The development of gas sensors that are based on metal/metal-oxide nanoclusters has attracted intensive research interest in the last years. Nanoclusters are suitable candidates for gas sensor applications because of their large surface-to-volume ratio that can be utilized for selective and rapid detection of various gaseous species with low-power consuming electronics. Herein, nanoclusters are used as building blocks for the construction of gas sensor where the electrical conductivity of the nanoclusters changes dramatically upon exposure to the target gas. In this review, recent progress in the fabrication of size-selected metallic nanoclusters and their utilization for gas sensor applications is presented. Special focus will be given to the enhancement of the sensing performance through the rational functionalization and utilization of different nanocluster materials.

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