Potential Application Zn-MOF/MnO2 Composite as Methanol Gas Sensor

2019 ◽  
Vol 811 ◽  
pp. 113-119
Author(s):  
Aep Patah ◽  
Wandi Kasim ◽  
Brian Yuliarto
Keyword(s):  
Porous Material ◽  
Manganese Oxide ◽  
Gas Sensor ◽  
Coordination Compound ◽  
Indoor Air ◽  
Potential Application ◽  
Secondary Building Unit ◽  
Methanol Vapor ◽  
Bridging Ligand ◽  
Polymeric Coordination

Methanol is a simple alcohol compound which is known very volatile and to be toxic inside of human’s body. Therefore, it is necessary to develop a sensor that is capable to detect the methanol vapor in indoor air. Zn-based MOF is a polymeric coordination compound made up of ZnxOyCz inorganic cluster as the secondary building unit (SBU) and benzene dicarboxylate as the bridging ligand and formed bulky and porous material. In this research, composites of manganese oxide (MnO2) and Zn-based MOF are synthesized and characterized as material sensor for its capability towards sensing of methanol gas. Diffractogram of PXRD reveals that the synthesized Zn-MOF is crystalline and become more amorphous due to MnO2 addition. The composite was made into pellets and measured of its resistivity. The addition of MnO2 to the Zn-MOF lowered the resistivity of the Zn-MOF and the composite was found to be sensitive towards methanol vapor.

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.

A Novel Tungsten Trioxide Based Gas Sensor for Indoor Formaldehyde Detection

2021 ◽  
Vol 16 (3) ◽  
pp. 363-367
Author(s):  
Gaoqi Zhang ◽  
Fan Zhang ◽  
Kaifang Wang ◽  
Tao Tian ◽  
Shanyu Liu ◽  
...  
Keyword(s):  
Electron Microscope ◽  
Gas Sensor ◽  
Indoor Air ◽  
Gas Sensing ◽  
X Ray Diffraction ◽  
X Ray ◽  
Sensing Material ◽  
Transmission Electron ◽  
Gas Sensing Properties ◽  
Gas Response

Accurate and real-time detection of formaldehyde (HCHO) in indoor air is urgently needed for human health. In this work, a ceramic material (WO3·H2O) with unique structure was successfully prepared using an efficient hydrothermal method. The crystallinity, morphology and microstructure of the as-prepared sensing material were analyzed by X-ray diffraction (XRD), field emission scanning electron microscope (FESEM) as well as transmission electron microscope (TEM). The characterization results suggest that the as-prepared sample is composed of square-like nanoplates with uneven surface. Formaldehyde vapor is utilized as the target gas to investigate gas sensing properties of the synthesized novel nanoplates. The testing results indicate that the as-fabricated gas sensor exhibit high gas response and excellent repeatability to HCHO gas. The response value (Ra/Rg) is 24.5 towards 70 ppm HCHO gas at 350 °C. Besides, the gas sensing mechanism was described.

scholarly journals Graphene-manganese oxide hybrid porous material and its application in carbon dioxide adsorption

2012 ◽  
Vol 57 (23) ◽  
pp. 3059-3064 ◽  
Author(s):  
Ding Zhou ◽  
Qing Liu ◽  
QianYi Cheng ◽  
YanChao Zhao ◽  
Yi Cui ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Porous Material ◽  
Manganese Oxide ◽  
Carbon Dioxide Adsorption

Sensitive detection of indoor air contaminants using a novel gas sensor based on coral-shaped tin dioxide nanostructures

2012 ◽  
Vol 165 (1) ◽  
pp. 24-33 ◽  
Author(s):  
Yuteng Wan ◽  
Huihua Li ◽  
Jinyun Liu ◽  
Fanli Meng ◽  
Zhen Jin ◽  
...  
Keyword(s):  
Gas Sensor ◽  
Indoor Air ◽  
Tin Dioxide ◽  
Sensitive Detection ◽  
Air Contaminants

scholarly journals Detection of Gaseous Indoor-Air Pollutants Using Multi Gas Sensor System and a Production System

1998 ◽  
Vol 34 (8) ◽  
pp. 913-921 ◽  
Author(s):  
Shigeki HIROBAYASHI ◽  
Haruhiko KIMURA ◽  
Hidetaka NAMBO ◽  
Satoshi SAKAMORI ◽  
Takashi OYABU
Keyword(s):  
Gas Sensor ◽  
Indoor Air ◽  
Production System ◽  
Air Pollutants ◽  
Sensor System ◽  
Indoor Air Pollutants

scholarly journals Basic Research on Potential Application of Fire Detection by Measuring Fire Detection Tendency of Indoor Air Quality Measurement Factors

2020 ◽  
Vol 34 (1) ◽  
pp. 37-46
Author(s):  
Su-Gil Choi ◽  
Se-Young Jin ◽  
Sang-Min Park ◽  
Yeong-Jae Nam ◽  
Si-Kuk Kim
Keyword(s):  
Air Quality ◽  
Indoor Air Quality ◽  
Indoor Air ◽  
Potential Application ◽  
Quality Measurement ◽  
Fire Detection ◽  
Basic Research ◽  
Smoke Detector ◽  
Experimental Conditions ◽  
Fire Experiment

This is a basic research on potential application of fire detection by measuring fire detection tendency of indoor air quality measurement factors. In this study, operation experiment using smoke detector sensitivity tester and paper fire experiment specified in UL 268 standards were conducted to evaluate the fire detection tendency of indoor air quality measurement factors. Based on the cross-substitution of values measured in the paper fire experiment, PM10 (excluding average) and HCHO (excluding average and maximum) for the indoor air quality meter (IAQ); PM1.0, PM2.5, and PM10 for IAQ S2; and CO (excluding the average and maximum) for combustion gas analyzers showed consistent tendency despite changes in the measured values for smoke generation under all experimental conditions. In particular, PM10 and CO are considered the most applicable fire detection factors among the factors measured in the experiment.

scholarly journals Rh-doped MoSe2 as a toxic gas scavenger: a first-principles study

2019 ◽  
Vol 1 (2) ◽  
pp. 772-780 ◽  
Author(s):  
Hao Cui ◽  
Guozhi Zhang ◽  
Xiaoxing Zhang ◽  
Ju Tang
Keyword(s):  
Gas Sensor ◽  
First Principles ◽  
Potential Application ◽  
Stable Configuration ◽  
First Principles Study ◽  
Toxic Gases ◽  
Toxic Gas

Using first-principles theory, we investigated the most stable configuration for the Rh dopant on a MoSe2 monolayer, and the interaction of the Rh-doped MoSe2 (Rh-MoSe2) monolayer with four toxic gases (CO, NO, NO2 and SO2) to exploit the potential application of the Rh-MoS2 monolayer as a gas sensor or adsorbent.

scholarly journals The Synthesis of the Pomegranate-Shaped α-Fe2O3 Using an In Situ Corrosion Method of Scorodite and Its Gas-Sensitive Property

Nanomaterials ◽  
2019 ◽  
Vol 9 (7) ◽  
pp. 977
Author(s):  
Wang ◽  
Tang ◽  
Cao ◽  
Chen ◽  
Rong
Keyword(s):  
Iron Oxide ◽  
Gas Sensor ◽  
Potential Application ◽  
Gas Sensing ◽  
Fe2o3 Nanoparticles ◽  
Forming Process ◽  
Gas Sensing Properties ◽  
Sensitive Property ◽  
Research Hotspots

The release of hazardous gas increases with the development of industry. The research of gas-sensitive materials has attracted attention. Nanoscale iron oxide (α-Fe2O3) is one of the research hotspots of gas-sensitive materials because it is a cheap, non-toxic semiconductor material. In this study, pomegranate-shaped α-Fe2O3 was synthesized using an in situ corrosion method of scorodite. Spherical-shaped α-Fe2O3 nanoparticles were included in the octahedral shells. The forming process of the structure was analyzed by a variety of measurements. The shell was formed first through the deposition of Fe(OH)3, which was produced by hydrolyzing scorodite. Then, the corrosion was continued and Fe(OH)3 precipitation was produced below the shell. The particles aggregated and formed spheres. The pomegranate-shaped α-Fe2O3 was formed when the scorodite was hydrolyzed completely. The gas-sensing properties of α-Fe2O3 were investigated. The results showed that pomegranate-shaped α-Fe2O3 was responsive to a variety of gases, especially xylene. The value of Ra/Rg was 67.29 at 340 °C when the concentration of xylene was 1000 ppm. This indicated the pomegranate-shaped α-Fe2O3 has potential application as a xylene gas sensor.

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