Thin Solid Films Semiconducting Metal Oxide Gas Sensors: A Brief Review

2016 ◽  
Vol 14 (4) ◽  
pp. 331-345 ◽  
Author(s):  
L. Castañeda ◽  
M. Gonzalez-Alatriste ◽  
M. Avendaño-Alejo
Keyword(s):  
Metal Oxide ◽  
Gas Sensors ◽  
Thin Solid Films ◽  
Solid Films ◽  
Metal Oxide Gas Sensors ◽  
Semiconducting Metal Oxide

Extraordinary performance of semiconducting metal oxide gas sensors using dielectric excitation

2020 ◽  
Vol 3 (5) ◽  
pp. 280-289 ◽  
Author(s):  
Radislav A. Potyrailo ◽  
Steven Go ◽  
Daniel Sexton ◽  
Xiaxi Li ◽  
Nasr Alkadi ◽  
...  
Keyword(s):  
Metal Oxide ◽  
Gas Sensors ◽  
Metal Oxide Gas Sensors ◽  
Semiconducting Metal Oxide

scholarly journals A Compact, Reliable and Efficient 16 Channel Power Supply for the Automated Screening of Semiconducting Metal Oxide Gas Sensors

Electronics ◽  
2019 ◽  
Vol 8 (8) ◽  
pp. 882 ◽  
Author(s):  
Christof Hammer ◽  
Johannes Warmer ◽  
Sebastian Sporrer ◽  
Peter Kaul ◽  
Ronald Thoelen ◽  
...  
Keyword(s):  
Metal Oxide ◽  
Embedded System ◽  
Gas Sensors ◽  
Power Supply ◽  
Failure Detection ◽  
Operating Conditions ◽  
Detection Methods ◽  
Metal Oxide Gas Sensors ◽  
Automated Screening ◽  
Semiconducting Metal Oxide

The choice of suitable semiconducting metal oxide (MOX) gas sensors for the detection of a specific gas or gas mixture is time-consuming since the sensor’s sensitivity needs to be characterized at multiple temperatures to find its optimal operating conditions. To obtain reliable measurement results, it is very important that the power for the sensor’s integrated heater is stable, regulated and error-free (or error-tolerant). Especially the error-free requirement can be only be achieved if the power supply implements failure-avoiding and failure-detection methods. The biggest challenge is deriving multiple different voltages from a common supply in an efficient way while keeping the system as small and lightweight as possible. This work presents a reliable, compact, embedded system that addresses the power supply requirements for fully automated simultaneous sensor characterization for up to 16 sensors at multiple temperatures. The system implements efficient (avg. 83.3% efficiency) voltage conversion with low ripple output (<32 mV) and supports static or temperature-cycled heating modes. Voltage and current of each channel are constantly monitored and regulated to guarantee reliable operation. To evaluate the proposed design, 16 sensors were screened. The results are shown in the experimental part of this work.

scholarly journals A Compact 16 Channel Embedded System with High Dynamic Range Readout and Heater Management for Semiconducting Metal Oxide Gas Sensors

Electronics ◽  
2020 ◽  
Vol 9 (11) ◽  
pp. 1855
Author(s):  
Christof Hammer ◽  
Johannes Warmer ◽  
Stephan Maurer ◽  
Peter Kaul ◽  
Ronald Thoelen ◽  
...  
Keyword(s):  
Metal Oxide ◽  
Embedded System ◽  
Gas Sensors ◽  
Dynamic Range ◽  
High Dynamic Range ◽  
Maximum Error ◽  
Power Circuit ◽  
Commercial Off The Shelf ◽  
Metal Oxide Gas Sensors ◽  
Semiconducting Metal Oxide

The simultaneous operation of multiple different semiconducting metal oxide (MOX) gas sensors is demanding for the readout circuitry. The challenge results from the strongly varying signal intensities of the various sensor types to the target gas. While some sensors change their resistance only slightly, other types can react with a resistive change over a range of several decades. Therefore, a suitable readout circuit has to be able to capture all these resistive variations, requiring it to have a very large dynamic range. This work presents a compact embedded system that provides a full, high range input interface (readout and heater management) for MOX sensor operation. The system is modular and consists of a central mainboard that holds up to eight sensor-modules, each capable of supporting up to two MOX sensors, therefore supporting a total maximum of 16 different sensors. Its wide input range is archived using the resistance-to-time measurement method. The system is solely built with commercial off-the-shelf components and tested over a range spanning from 100 Ω to 5 GΩ (9.7 decades) with an average measurement error of 0.27% and a maximum error of 2.11%. The heater management uses a well-tested power-circuit and supports multiple modes of operation, hence enabling the system to be used in highly automated measurement applications. The experimental part of this work presents the results of an exemplary screening of 16 sensors, which was performed to evaluate the system’s performance.

scholarly journals An array of WO3 and CTO heterojunction semiconducting metal oxide gas sensors used as a tool for explosive detection

2017 ◽  
Vol 5 (5) ◽  
pp. 2172-2179 ◽  
Author(s):  
Lauren A. Horsfall ◽  
David C. Pugh ◽  
Christopher S. Blackman ◽  
Ivan P. Parkin
Keyword(s):  
Metal Oxide ◽  
Gas Sensors ◽  
Explosive Detection ◽  
Metal Oxide Gas Sensors ◽  
Detection Of Explosives ◽  
Semiconducting Metal Oxide

An array of WO3 and CTO heterojunction semiconducting metal oxide gas sensors used for the detection of explosives.

Sulfur Dioxide Sensors

2021 ◽  
Keyword(s):  
Ionic Liquids ◽  
Sulfur Dioxide ◽  
Metal Oxide ◽  
Gas Sensors ◽  
Optical Sensors ◽  
Recent Progress ◽  
Amperometric Sensors ◽  
Metal Oxide Sensors ◽  
Semiconducting Metal Oxide

Recent progress on the sensing and monitoring of sulfur dioxide in the environment is presented. The sensing materials covered include potentiometric gas sensors, amperometric sensors, optical sensors involving colorimetric and fluorescence changes, sensors based on ionic liquids, semiconducting metal-oxide sensors, photoacoustic detectors and biosensors.

scholarly journals Sensitive and Low-Power Metal Oxide Gas Sensors with a Low-Cost Microelectromechanical Heater

ACS Omega ◽  
2021 ◽  
Author(s):  
Yulong Chen ◽  
Mingjie Li ◽  
Wenjun Yan ◽  
Xin Zhuang ◽  
Kar Wei Ng ◽  
...  
Keyword(s):  
Metal Oxide ◽  
Low Power ◽  
Gas Sensors ◽  
Low Cost ◽  
Metal Oxide Gas Sensors
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