scholarly journals Humidity-Resistive Optical NO Gas Sensor Devices Based on Cobalt Tetraphenylporphyrin Dispersed in Hydrophobic Polymer Matrix

Sensors ◽  
2020 ◽  
Vol 20 (5) ◽  
pp. 1295 ◽  
Author(s):  
Shunsuke Shiba ◽  
Kohei Yamada ◽  
Masanobu Matsuguchi
Keyword(s):  
Polymer Film ◽  
Gas Sensor ◽  
Polymer Matrix ◽  
Limit Of Detection ◽  
High Dispersion ◽  
High Humidity ◽  
Humidity Resistance ◽  
Hydrophobic Polymer ◽  
Sensor Device ◽  
Sensor Devices

We report on an optical nitrogen oxide (NO) gas sensor device using cobalt tetraphenylporphyrin (CoTPP) dispersed in three kinds of hydrophobic polymer film matrix (polystyrene (PSt), ethylcellulose (EC), and polycyclohexyl methacrylate (PCHMA)) to improve humidity resistance. Our approach is very effective because it allows us to achieve not only high humidity resistance, but also a more than sixfold increase in sensitivity compared with CoTPP film due to the high dispersion of CoTPP in the polymer film. The limit of detection was calculated as 33 ppb for the CoTPP-dispersed EC film, which is lower than that of CoTPP film (92 ppb).

scholarly journals A new approach to gas sensing with nanotechnology

2012 ◽  
Vol 370 (1967) ◽  
pp. 2448-2473 ◽  
Author(s):  
Swati Sharma ◽  
Marc Madou
Keyword(s):  
Low Power ◽  
Gas Sensor ◽  
Lower Cost ◽  
Gas Sensing ◽  
Limit Of Detection ◽  
Oxide Semiconductors ◽  
New Approach ◽  
Sensor Devices ◽  
Carbon Nanowire ◽  
Nanostructured Metal

Nanosized gas sensor elements are potentially faster, require lower power, come with a lower limit of detection, operate at lower temperatures, obviate the need for expensive catalysts, are more heat shock resistant and might even come at a lower cost than their macro-counterparts. In the last two decades, there have been important developments in two key areas that might make this promise a reality. First is the development of a variety of very good performing nanostructured metal oxide semiconductors (MOSs), the most commonly used materials for gas sensing; and second are advances in very low power loss miniaturized heater elements. Advanced nano- or micro–nanogas sensors have attracted much attention owing to a variety of possible applications. In this article, we first discuss the mechanism underlying MOS-based gas sensor devices, then we describe the advances that have been made towards MOS nanostructured materials and the progress towards low-power nano- and microheaters. Finally, we attempt to design an ideal nanogas sensor by combining the best nanomaterial strategy with the best heater implementation. In this regard, we end with a discussion of a suspended carbon nanowire-based gas sensor design and the advantages it might offer compared with other more conventional gas sensor devices.

scholarly journals PROCESS TECHNOLOGY OF FABRICATION NO2 GAS SENSOR DEVICES WITH ACTIVE LAYER In2O3

2016 ◽  
Vol 10 (1) ◽  
pp. 69
Author(s):  
Slamet Widodo
Keyword(s):  
Metal Oxide ◽  
Aluminum Oxide ◽  
Gas Sensor ◽  
Heat Distribution ◽  
Process Technology ◽  
Sensitive Layer ◽  
Resistance Change ◽  
No2 Gas Sensor ◽  
Sensor Device ◽  
Sensor Devices

This paper discuss the design and fabrication of NO<sub>2 </sub>gas sensor based on metal oxide using thick film technology was described. The design of gas sensor is consisted of components, i.e. heater, electrode (interdigital fingers) and sensitive layer from In<sub>2</sub>O<sub>3</sub> material. This sensor has been designed as multilayers with heater and both electrodes in one surface, in accordance with miniaturisation aspect, heat distribution and less consumption of energy from the sensor device. The heater and electrode were fabricated on alumina substrate (aluminum oxide/Al<sub>2</sub>O<sub>3</sub>) with silver paste. The In<sub>2</sub>O<sub>3 </sub>layer provides\ resistance change when it is exposed by NO<sub>2</sub> gas. It indicates that this sensor device has a potency to be used as NO<sub>2 </sub>detector.

scholarly journals PROCESS TECHNOLOGY OF FABRICATION NO2 GAS SENSOR DEVICES WITH ACTIVE LAYER In2O3

2018 ◽  
Vol 10 (1) ◽  
pp. 69
Author(s):  
Slamet Widodo
Keyword(s):  
Metal Oxide ◽  
Aluminum Oxide ◽  
Gas Sensor ◽  
Heat Distribution ◽  
Process Technology ◽  
Sensitive Layer ◽  
Resistance Change ◽  
No2 Gas Sensor ◽  
Sensor Device ◽  
Sensor Devices

This paper discuss the design and fabrication of NO<sub>2 </sub>gas sensor based on metal oxide using thick film technology was described. The design of gas sensor is consisted of components, i.e. heater, electrode (interdigital fingers) and sensitive layer from In<sub>2</sub>O<sub>3</sub> material. This sensor has been designed as multilayers with heater and both electrodes in one surface, in accordance with miniaturisation aspect, heat distribution and less consumption of energy from the sensor device. The heater and electrode were fabricated on alumina substrate (aluminum oxide/Al<sub>2</sub>O<sub>3</sub>) with silver paste. The In<sub>2</sub>O<sub>3 </sub>layer provides\ resistance change when it is exposed by NO<sub>2</sub> gas. It indicates that this sensor device has a potency to be used as NO<sub>2 </sub>detector.

scholarly journals High Response of Ethanol Gas Sensor Based on NiO-Doped Apple Pectin by the Solution Process

Coatings ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 1073
Author(s):  
Jia-Cheng Jian ◽  
Yu-Chi Chang ◽  
Sheng-Po Chang ◽  
Shoou-Jinn Chang
Keyword(s):  
Gas Sensor ◽  
Solution Process ◽  
Processing Technique ◽  
Maximum Efficiency ◽  
Apple Pectin ◽  
Film Sensor ◽  
Sensor Device ◽  
Operational Temperature ◽  
Sensor Devices ◽  
First Time

Novel gas sensor devices, based on biomaterial apple pectin film (APN) doped with NiO, were fabricated for the first time using a solution processing technique. The device was then annealed in a microwave chamber. The structural, elemental, and surface morphology of the device was investigated, using TEM, XPS, and AFM, respectively. The as-fabricated film sensor possessed a superior sensing performance regarding ethanol gas, compared to the pure apple pectin film sensor. The response of the device was recorded at a maximum efficiency of 161. For a 10 ppm concentration of ethanol gas at an operational temperature of 250 °C, the response time was 1.379 s. Nevertheless, the sensing mechanism for the sensor device is also described thoroughly.

Star-Fruit-Shaped CuO Structures for High Performance Ethanol Gas Sensor Device

2021 ◽  
Vol 13 (4) ◽  
pp. 724-733
Author(s):  
Ahmad Umar ◽  
Ahmed A. Ibrahim ◽  
Rajesh Kumar ◽  
Hassan Algadi ◽  
Hasan Albargi ◽  
...  
Keyword(s):  
Gas Sensor ◽  
High Performance ◽  
Crystal Size ◽  
Gas Sensing ◽  
Sensor Applications ◽  
Sensor Device ◽  
Star Fruit ◽  
Micro Structures ◽  
Gas Response ◽  
Structural Crystal

In this paper, star-fruit-shaped CuO microstructures were hydrothermally synthesized and subsequently characterized through different techniques to understand morphological, compositional, structural, crystal, optical and vibrational properties. The formation of star-fruit-shaped structures along with some polygonal and spherical nanostructures was confirmed by FESEM analysis. XRD data and Raman spectrum confirmed the monoclinic tenorite crystalline phase of the CuO with crystal size 17.61 nm. Star-fruit-shaped CuO microstructures were examined for ethanol gas sensing behavior at various operating temperatures and concentrations. The gas response of 135% was observed at the optimal temperature of 225 °C. Due to excellent selectivity, stability and re-usability, the as-fabricated sensor based on star-fruit-shaped CuO micro-structures may be explored for future toxic gas sensor applications.

scholarly journals A Novel Type Room Temperature Surface Photovoltage Gas Sensor Device 

2018 ◽  
Author(s):  
Monika Kwoka ◽  
Michal A. Borysiewicz ◽  
Pawel Tomkiewicz ◽  
Anna Piotrowska ◽  
Jacek Szuber
Keyword(s):  
Gas Sensor ◽  
Room Temperature ◽  
Gas Sensing ◽  
Signal To Noise Ratio ◽  
High Sensitivity ◽  
Fast Response ◽  
Surface Photovoltage ◽  
Kelvin Probe ◽  
Sensor Device ◽  
Developed Surface

In this paper a novel type of a highly sensitive gas sensor device based on the surface photovoltage effect is described. The developed surface photovoltage gas sensor is based on a reverse Kelvin probe approach. As the active gas sensing electrode the porous ZnO nanostructured thin films are used deposited by the direct current (DC) reactive magnetron sputtering method exhibiting the nanocoral surface morphology combined with an evident surface nonstoichiometry related to the unintentional surface carbon and water vapor contaminations. Among others, the demonstrated SPV gas sensor device exhibits a high sensitivity of 1 ppm to NO2 with a signal to noise ratio of about 50 and a fast response time of several seconds under the room temperature conditions.

scholarly journals Study of Singlet Oxygen Dynamics on Silicon Polymer Matrix

2019 ◽  
Vol 2019 ◽  
pp. 1-6 ◽  
Author(s):  
Jeong-Wook Hwang ◽  
Seung-Jin Jung ◽  
Il Heo ◽  
Hyun-A Son ◽  
Jong-Ho Kim ◽  
...  
Keyword(s):  
Singlet Oxygen ◽  
Detailed Analysis ◽  
Polymer Film ◽  
Polymer Matrix ◽  
Time Resolved ◽  
Surface Component ◽  
Component C ◽  
Oxygen Dynamics ◽  
Silicone Polymer

We report a detailed analysis of singlet oxygen generated from the photofunctional polymer film (PFPF) matrix which is the silicone polymer film (PDMS) embedded with a photosensitizer. Activation and deactivation dynamics of singlet oxygen generated from PFPFs were investigated with time-resolved phosphorescence spectroscopy. The singlet oxygen generated from PFPFs was dissipated into three different regions of the polymer matrix; the inside (component A), the surface (component B), and the outside (component C). According to the deactivation dynamics of singlet oxygen in the polymer matrix, the components B and C are expected to be more important for various applications.

scholarly journals A Robust Fiber Bragg Grating Hydrogen Gas Sensor Using Platinum-Supported Silica Catalyst Film

2018 ◽  
Vol 2018 ◽  
pp. 1-8 ◽  
Author(s):  
Marina Kurohiji ◽  
Seiji Ichiriyama ◽  
Naoki Yamasaku ◽  
Shinji Okazaki ◽  
Naoya Kasai ◽  
...  
Keyword(s):  
Fiber Bragg Grating ◽  
Gas Sensor ◽  
Temperature Change ◽  
Catalytic Combustion ◽  
Room Temperature ◽  
Precursor Solution ◽  
Hydrogen Gas ◽  
Combustion Heat ◽  
Catalyst Film ◽  
Sensor Device

A robust fiber Bragg grating (FBG) hydrogen gas sensor for reliable multipoint-leakage monitoring has been developed. The sensing mechanism is based on shifts of center wavelength of the reflection spectra due to temperature change caused by catalytic combustion heat. The sensitive film which consists of platinum-supported silica (Pt/SiO2) catalyst film was obtained using sol-gel method. The precursor solution was composed of hexachloroplatinic acid and commercially available silica precursor solution. The atom ratio of Si : Pt was fixed at 13 : 1. A small amount of this solution was dropped on the substrate and dried at room temperature. After that, the film was calcined at 500°C in air. These procedures were repeated and therefore thick hydrogen-sensitive films were obtained. The catalytic film obtained by 20-time coating on quartz glass substrate showed a temperature change 75 K upon exposure to 3 vol.% H2. For realizing robust sensor device, this catalytic film was deposited and FBG portion was directly fixed on titanium substrate. The sensor device showed good performances enough to detect hydrogen gas in the concentration range below lower explosion limit at room temperature. The enhancement of the sensitivity was attributed to not only catalytic combustion heat but also related thermal strain.

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