scholarly journals Development of Co(OH)xF2−x Nanosheets for Acetone Gas Sensor Applications: Material Characterization and Sensor Performance Evaluation

Crystals ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 968
Author(s):  
Yaping Yan ◽  
Tae-yil Eom ◽  
Shiyu Xu ◽  
Pil J. Yoo ◽  
Changzeng Yan ◽  
...  
Keyword(s):  
Gas Sensor ◽  
Material Characterization ◽  
High Specific Surface Area ◽  
High Concentration ◽  
Hydrothermal Route ◽  
Sensor Applications ◽  
Sensor Performance ◽  
Operation Temperature ◽  
Catalytic Function ◽  
New Material

This study reports the employment of Co(OH)xF2−x nanosheets, a new material in the sensor field, for gas sensor applications. We synthesize Co(OH)xF2−x nanosheets via a hydrothermal route using SiO2 sphere templates. Our material characterization confirms that the material is a densely clustered Co(OH)xF2−x nanosheet with an amorphous microstructure with some short-range ordering. Sensors based on the nanosheets demonstrate a high response of 269% toward 4.5 ppm of acetone gas at an operation temperature of 200 °C and a very low minimum detection limit of 40 ppb. It functions effectively up to a temperature below 300 °C, above which F is found to start to evaporate. Our discussion suggests that an excellent sensor performance arises from the high catalytic function of F incorporated in a high concentration in the material as well as the high specific surface area due to the morphology of densely clustered nanosheets.

scholarly journals Impact of Die Attach Sample Preparation on Its Measured Mechanical Properties for MEMS Sensor Applications

2021 ◽  
Vol 18 (1) ◽  
pp. 21-28
Author(s):  
Abel Misrak ◽  
Tushar Chauhan ◽  
Rabin Bhandari ◽  
A S M Raufur Chowdhury ◽  
Akshay Lakshminarayana ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Sample Preparation ◽  
Computational Modeling ◽  
Material Characterization ◽  
Computational Models ◽  
Preparation Technique ◽  
Sensor Applications ◽  
Sensor Performance ◽  
Mems Sensor ◽  
Die Attach

Abstract Computational modeling is often leveraged to design and optimize electronic packages for both performance and reliability purposes. One of the factors that affect the accuracy of computational models is the accuracy of the material properties. Microelectromechanical system sensors, in particular, are usually extremely sensitive to slightest material property changes in the package. Therefore, even small measurement variations in material characterization due to different sample preparation methods or different testing techniques can impact accuracy of computational models that are leveraged for designing or analyzing sensor performance. The challenge in material characterization is even greater for materials that require curing. Die attach polymers, for example, have strict curing profile requirements that are used during the manufacturing process. Such curing conditions are usually hard to duplicate in laboratories, and the samples used for material characterization may not necessarily be representative of the actual component in the final product. In this study, the effect of parameters such as temperature curing profile, application of pressure during curing, and sample preparation technique on temperature-dependent thermomechanical properties of two types of die attach elastomers is investigated. The mechanical properties, including the elastic modulus (E), coefficient of thermal expansion, and glass transition temperature of the die attach material, are measured using a suite of techniques such as dynamic mechanical analysis and thermomechanical analysis. The analysis is performed for a wide temperature range corresponding to typical sensor applications. It is shown that sample preparation and characterization techniques have a considerable impact on the measurements, which results in different MEMS sensor performance predictions through computational modeling.

High gas sensor performance of WO3 nanofibers prepared by electrospinning

2021 ◽  
Vol 864 ◽  
pp. 158745
Author(s):  
Paulo V. Morais ◽  
Pedro H. Suman ◽  
Ranilson A. Silva ◽  
Marcelo O. Orlandi
Keyword(s):  
Gas Sensor ◽  
Sensor Performance

Pulsed laser deposition of metal oxide nanostructures for highly sensitive gas sensor applications

2016 ◽  
Vol 236 ◽  
pp. 978-987 ◽  
Author(s):  
Joni Huotari ◽  
Ville Kekkonen ◽  
Tomi Haapalainen ◽  
Martin Leidinger ◽  
Tilman Sauerwald ◽  
...  
Keyword(s):  
Metal Oxide ◽  
Pulsed Laser Deposition ◽  
Gas Sensor ◽  
Pulsed Laser ◽  
Laser Deposition ◽  
Sensor Applications ◽  
Oxide Nanostructures ◽  
Highly Sensitive ◽  
Metal Oxide Nanostructures

Iron Nanoparticles Coated with Nanostructured Carbon: Synthesis and Application in Glucose Biosensors

2017 ◽  
Vol 899 ◽  
pp. 216-220
Author(s):  
R.L. Roman ◽  
J.P.Z. Gonçalves ◽  
S.C. Fernandes ◽  
Lucinao Luiz Silva ◽  
J. Dal Magro ◽  
...  
Keyword(s):  
Glucose Biosensor ◽  
Performance Evaluations ◽  
Carbon Paste ◽  
Hydrothermal Route ◽  
Sensor Performance ◽  
Carbon Coated ◽  
New Type ◽  
Co Precipitation ◽  
Paste Electrode ◽  
Oxidation Of Glucose

Nanowires of carbon coated ferric oxide (Fe2O3/C) have been studied to be applied at an electrochemical glucose biosensor as a new type of carbon paste electrode (CPE) modifier. The Fe2O3/C was synthesized by adapting co-precipitation hydrothermal route. Firstly, amperometric sensor based on a modified CPE doped with Fe2O3 has been developed and compared with CPE doped with Fe2O3/C for hydrogen peroxide (H2O2) determination. The performance evaluations for the modified materials and sensors were studied in detail through cyclic voltammetry (CV) method. After, the electrochemical sensor performance was also evaluated for glucose oxidase (GOx) response biosensor due to considerable interest in the blood sugar control. The results demonstrate that the GOx retains its biocatalytic activity toward the oxidation of glucose and that the bioelectrode modified by the Fe2O3/C matrix has potential for use in biosensors and other bioelectronics devices.

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.

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