Metallo-porphyrins as gas sensing material for colorimetric gas sensors on planar optical waveguides

2011 ◽  
Author(s):  
Carolin Peter ◽  
Katrin Schmitt ◽  
Martin Schiel ◽  
Jürgen Wöllenstein
Keyword(s):  
Gas Sensors ◽  
Optical Waveguides ◽  
Gas Sensing ◽  
Sensing Material ◽  
Planar Optical Waveguides

scholarly journals Optimization of a Low-Power Chemoresistive Gas Sensor: Predictive Thermal Modelling and Mechanical Failure Analysis

Sensors ◽  
2021 ◽  
Vol 21 (3) ◽  
pp. 783 ◽  
Author(s):  
Andrea Gaiardo ◽  
David Novel ◽  
Elia Scattolo ◽  
Michele Crivellari ◽  
Antonino Picciotto ◽  
...  
Keyword(s):  
Low Power ◽  
Failure Analysis ◽  
Gas Sensors ◽  
High Performance ◽  
Gas Sensing ◽  
Mechanical Failure ◽  
Sensing Applications ◽  
Theoretical Approaches ◽  
Sensing Material ◽  
Silicon Bulk

The substrate plays a key role in chemoresistive gas sensors. It acts as mechanical support for the sensing material, hosts the heating element and, also, aids the sensing material in signal transduction. In recent years, a significant improvement in the substrate production process has been achieved, thanks to the advances in micro- and nanofabrication for micro-electro-mechanical system (MEMS) technologies. In addition, the use of innovative materials and smaller low-power consumption silicon microheaters led to the development of high-performance gas sensors. Various heater layouts were investigated to optimize the temperature distribution on the membrane, and a suspended membrane configuration was exploited to avoid heat loss by conduction through the silicon bulk. However, there is a lack of comprehensive studies focused on predictive models for the optimization of the thermal and mechanical properties of a microheater. In this work, three microheater layouts in three membrane sizes were developed using the microfabrication process. The performance of these devices was evaluated to predict their thermal and mechanical behaviors by using both experimental and theoretical approaches. Finally, a statistical method was employed to cross-correlate the thermal predictive model and the mechanical failure analysis, aiming at microheater design optimization for gas-sensing applications.

Enhanced Gas Sensing of Tin Dioxide Based Sensor for Indoor Formaldehyde Application

2021 ◽  
Vol 16 (2) ◽  
pp. 337-342
Author(s):  
Gaoqi Zhang ◽  
Fan Zhang ◽  
Kaifang Wang ◽  
Shanyu Liu ◽  
Ying Wang ◽  
...  
Keyword(s):  
Gas Sensors ◽  
Tin Dioxide ◽  
Gas Sensing ◽  
Fast Response ◽  
Sensing Material ◽  
Gas Sensing Properties ◽  
Recovery Times ◽  
Response And Recovery ◽  
Formaldehyde Sensing ◽  
Gas Response

Indoor formaldehyde detection is of great important at present. Using efficient solvothermal method, nanosheet-constructed and nanorod-constructed hierarchical tin dioxide (SnO2) microspheres were successfully synthesized in this work and used for the gas sensing material for indoor formaldehyde application. The as-prepared two kinds of SnO2 gas sensing materials were applied to fabricate the gas sensors and formaldehyde gas sensing experiments were carried out. The HCHO gas sensing tests indicate that the gas response of the nanosheet-constructed SnO2 microspheres is about 1.7 times higher than that of the nanorod-constructed SnO2 microspheres. In addition, both of the two SnO2 based gas sensors show almost fast response and recovery time to HCHO gas. For the nanosheet-constructed microspheres, the response value is estimated to be 32.0 at 350 °C to 60 ppm formaldehyde gas, while the response and recovery times are 7 and 5 s, respectively. The simple and efficient preparation method and improved gas sensing properties show that the as-synthesized hierarchical SnO2 microsphere that is constructed by a large amount of nanosheets exhibits significant potential application for the indoor formaldehyde sensing.

Metallo-porphyrin zinc as gas sensitive material for colorimetric gas sensors on planar optical waveguides

2012 ◽  
Vol 18 (7-8) ◽  
pp. 925-930 ◽  
Author(s):  
Carolin Peter ◽  
Katrin Schmitt ◽  
Martin Apitz ◽  
Juergen Woellenstein
Keyword(s):  
Gas Sensors ◽  
Optical Waveguides ◽  
Sensitive Material ◽  
Planar Optical Waveguides

Recent advances in 2D black phosphorus based materials for gas sensing applications

2021 ◽  
Vol 9 (11) ◽  
pp. 3773-3794
Author(s):  
Aaryashree ◽  
Pratik V. Shinde ◽  
Amitesh Kumar ◽  
Dattatray J. Late ◽  
Chandra Sekhar Rout
Keyword(s):  
Physicochemical Properties ◽  
Gas Sensors ◽  
Gas Sensing ◽  
Black Phosphorus ◽  
Sensing Applications ◽  
Recent Advances ◽  
Sensing Material ◽  
Black Phosphorous

Black phosphorous (BP) has emerged as a potential sensing material due to its exceptional physicochemical properties. The review presents both the theoretical and experimental aspects of the BP-based gas sensors.

scholarly journals Graphene-enhanced metal oxide gas sensors at room temperature: a review

2018 ◽  
Vol 9 ◽  
pp. 2832-2844 ◽  
Author(s):  
Dongjin Sun ◽  
Yifan Luo ◽  
Marc Debliquy ◽  
Chao Zhang
Keyword(s):  
Metal Oxide ◽  
Gas Sensors ◽  
Room Temperature ◽  
Gas Sensing ◽  
Metal Oxide Semiconductors ◽  
Oxide Semiconductors ◽  
Sensing Material ◽  
Metal Oxide Gas Sensors ◽  
Low Sensitivity ◽  
Sensing Performance

Owing to the excellent sensitivity to gases, metal-oxide semiconductors (MOS) are widely used as materials for gas sensing. Usually, MOS gas sensors have some common shortages, such as relatively poor selectivity and high operating temperature. Graphene has drawn much attention as a gas sensing material in recent years because it can even work at room temperature, which reduces power consumption. However, the low sensitivity and long recovery time of the graphene-based sensors limit its further development. The combination of metal-oxide semiconductors and graphene may significantly improve the sensing performance, especially the selectivity and response/recovery rate at room temperature. In this review, we have summarized the latest progress of graphene/metal-oxide gas sensors for the detection of NO2, NH3, CO and some volatile organic compounds (VOCs) at room temperature. Meanwhile, the sensing performance and sensing mechanism of the sensors are discussed. The improved experimental schemes are raised and the critical research directions of graphene/metal-oxide sensors in the future are proposed.

scholarly journals Planar Optical Waveguides for Application in Optoelectronic Gas Sensors

2008 ◽  
Vol 114 (6A) ◽  
pp. A-223-A-230 ◽  
Author(s):  
K. Golaszewska ◽  
E. Kamińska ◽  
T. Pustelny ◽  
P. Struk ◽  
T. Piotrowski ◽  
...  
Keyword(s):  
Gas Sensors ◽  
Optical Waveguides ◽  
Planar Optical Waveguides

SO2 gas sensing characteristics of FET- and resistor-type gas sensors having WO3 as sensing material

2020 ◽  
Vol 165 ◽  
pp. 107747 ◽  
Author(s):  
Gyuweon Jung ◽  
Yujeong Jeong ◽  
Yoonki Hong ◽  
Meile Wu ◽  
Seongbin Hong ◽  
...  
Keyword(s):  
Gas Sensors ◽  
Gas Sensing ◽  
Sensing Material ◽  
Sensing Characteristics ◽  
So2 Gas

scholarly journals Understanding the AC conductivity and permittivity of trapdoor chabazites for future development of next-generation gas sensors

2019 ◽  
Author(s):  
Chris Bowen
Keyword(s):  
Thermal Stability ◽  
Electrical Properties ◽  
Gas Sensors ◽  
Ac Conductivity ◽  
Gas Sensing ◽  
Activation Energies ◽  
Next Generation ◽  
Good Thermal Stability ◽  
Sensing Material ◽  
Cation Migration

Synthetic K+ chabazite (KCHA), Cs+ chabazite (CsCHA) and Zn2+ chabazite (ZnCHA) have been synthesized and investigated in order to relate the differences in their crystalline structures to their thermal stability, moisture content and frequency dependent alternating current (AC) conductivity, permittivity and phase angle at a range of temperatures. The materials are shown to exhibit the universal dielectric response, which is typical of materials consisting of both conductive and insulating regions. Due to the presence of porosity the three chabazites were hydrated significantly at room temperature and so the dehydrated state was achieved by heating the chabazites to high temperatures to ensure that all different energetic types of water were removed. Cation migration activation energies for KCHA (0.66 ± 0.10) eV, CsCHA (0.88 ± 0.01) eV and ZnCHA (0.90 ± 0.01) eV were determined during the cooling cycle from the fully dehydrated state to provide an accurate measurement the activation energies. Good thermal stability of the materials was observed up to 710 °C and below 200 °C the electrical properties can be strongly influenced by hydration level. Overall, it was determined that when either hydrated or dehydrated, KCHA had the highest conductivity and lowest cation migration activation energy of the three studied chabazites and thus has the most promising electrical properties for potential use as a gas sensing material in next-generation electrical- based gas sensors.

scholarly journals Editorial for the Special Issue on Nanostructure Based Sensors for Gas Sensing: from Devices to Systems

Micromachines ◽  
2019 ◽  
Vol 10 (9) ◽  
pp. 591
Author(s):  
Donato ◽  
Grassini
Keyword(s):  
Solid State ◽  
Gas Sensors ◽  
Gas Sensing ◽  
Electrical Characterization ◽  
Analytical Techniques ◽  
Special Issue ◽  
Measurement Systems ◽  
Sensing Material

The development of solid state gas sensors based on microtransducers and nanostructured sensing materials is the key point in the design of new portable measurement systems with sensing and identification performances comparable with those of most sophisticated analytical techniques. In such a context, a lot of effort must be spent of course in the development of the sensing material, but also in the choice of the transducer mechanism and structure, in the electrical characterization of the sensor prototypes, as well as in the design of suitable measurement setups. [...]

scholarly journals Hydrothermal Synthesis of Hierarchical SnO2 Nanostructures for Improved Formaldehyde Gas Sensing

Nanomaterials ◽  
2022 ◽  
Vol 12 (2) ◽  
pp. 228
Author(s):  
Pengyu Ren ◽  
Lingling Qi ◽  
Kairui You ◽  
Qingwei Shi
Keyword(s):  
Gas Sensors ◽  
Indoor Environment ◽  
Gas Sensing ◽  
Structural Difference ◽  
Sno2 Nanostructures ◽  
One Dimensional ◽  
Response Recovery ◽  
Sensing Material ◽  
Gas Sensing Properties ◽  
Volatile Organic

The indoor environment of buildings affects people’s daily life. Indoor harmful gases include volatile organic gas and greenhouse gas. Therefore, the detection of harmful gas by gas sensors is a key method for developing green buildings. The reasonable design of SnO2-sensing materials with excellent structures is an ideal choice for gas sensors. In this study, three types of hierarchical SnO2 microspheres assembled with one-dimensional nanorods, including urchin-like microspheres (SN-1), flower-like microspheres (SN-2), and hydrangea-like microspheres (SN-3), are prepared by a simple hydrothermal method and further applied as gas-sensing materials for an indoor formaldehyde (HCHO) gas-sensing test. The SN-1 sample-based gas sensor demonstrates improved HCHO gas-sensing performance, especially demonstrating greater sensor responses and faster response/recovery speeds than SN-2- and SN-3-based gas sensors. The improved HCHO gas-sensing properties could be mainly attributed to the structural difference of smaller nanorods. These results further indicate the uniqueness of the structure of the SN-1 sample and its suitability as HCHO- sensing material.

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