scholarly journals Monolithic Microwave-Microfluidic Sensors Made with Low Temperature Co-Fired Ceramic (LTCC) Technology

Sensors ◽  
2019 ◽  
Vol 19 (3) ◽  
pp. 577 ◽  
Author(s):  
Karol Malecha ◽  
Laura Jasińska ◽  
Anna Grytsko ◽  
Kamila Drzozga ◽  
Piotr Słobodzian ◽  
...  
Keyword(s):  
Low Temperature ◽  
Linear Response ◽  
Test Sample ◽  
Resonance Phenomenon ◽  
Buffer Solution ◽  
Microwave Frequencies ◽  
Microfluidic Sensors ◽  
Sensor Properties ◽  
Microwave Signals ◽  
Monolithic Structures

This paper compares two types of microfluidic sensors that are designed for operation in ISM (Industrial, Scientific, Medical) bands at microwave frequencies of 2.45 GHz and 5.8 GHz. In the case of the first sensor, the principle of operation is based on the resonance phenomenon in a microwave circuit filled with a test sample. The second sensor is based on the interferometric principle and makes use of the superposition of two coherent microwave signals, where only one goes through a test sample. Both sensors are monolithic structures fabricated using low temperature co-fired ceramics (LTCCs). The LTCC-based microwave-microfluidic sensor properties are examined and compared by measuring their responses for various concentrations of two types of test fluids: one is a mixture of water/ethanol, and the other is dopamine dissolved in a buffer solution. The experiments show a linear response for the LTCC-based microwave-microfluidic sensors as a function of the concentration of the components in both test fluids.

scholarly journals Monolithic Microwave-Microfluidic Sensors Made with Low Temperature Co-Fired Ceramics (LTCC) Technology

2019 ◽  
Author(s):  
Karol Malecha ◽  
Laura Jasińska ◽  
Anna Grytsko ◽  
Kamila Drzozga ◽  
Piotr Słobodzian ◽  
...  
Keyword(s):  
Low Temperature ◽  
Linear Response ◽  
Test Sample ◽  
Resonance Phenomenon ◽  
Buffer Solution ◽  
Microwave Frequencies ◽  
Microfluidic Sensors ◽  
Sensor Properties ◽  
Microwave Signals ◽  
Monolithic Structures

This paper compares two types of microfluidic sensors that are designed for operation in ISM bands at microwave frequencies of 2.45 GHz and 5.8 GHz. In the case of the first sensor, the principle of operation is based on the resonance phenomenon in a microwave circuit filled with a test sample. The second sensor is based on the interferometric principle and makes use of the superposition of two coherent microwave signals, where only one of them goes through a test sample. Both sensors are monolithic structures fabricated using low temperature co-fired ceramics (LTCC). The LTCC-based microwave-microfluidic sensor properties are examined and compared by measuring their responses for various concentrations of two types of test fluids: one is a mixture of water/ethanol, and the other is dopamine dissolved in a buffer solution. The experiments show a linear response for the LTCC-based microwave-microfluidic sensors as a function of the concentration of the components in both test fluids.

Magnetic aftereffect experiments at low temperature: Linear response and quantum noise

1995 ◽  
Vol 52 (5) ◽  
pp. 3466-3470 ◽  
Author(s):  
J-E. Wegrowe ◽  
R. Ballou ◽  
B. Barbara ◽  
A. Sulpice ◽  
V. S. Amaral ◽  
...  
Keyword(s):  
Low Temperature ◽  
Linear Response ◽  
Quantum Noise ◽  
Magnetic Aftereffect

Non-linear response of YBa2Cu3O7−y thin film microstrip resonator at microwave frequencies

1992 ◽  
Vol 84 (12) ◽  
pp. 1107-1110 ◽  
Author(s):  
R. Pinto ◽  
Ravi Kumar ◽  
Navdeep Goyal ◽  
P.R. Apte ◽  
S.P. Pai ◽  
...  
Keyword(s):  
Thin Film ◽  
Linear Response ◽  
Microstrip Resonator ◽  
Microwave Frequencies ◽  
Non Linear

Measurement of Permittivity of a Dielectric Sheet/Film at Microwave Frequencies using the Test Sample as a Radiator

1991 ◽  
Vol 8 (6) ◽  
pp. 339-343 ◽  
Author(s):  
P S Neelakanta ◽  
V Ungvichian ◽  
Chaoli Gu ◽  
P F Wahid
Keyword(s):  
Test Sample ◽  
Microwave Frequencies

scholarly journals DOMAIN WALL RESISTIVITY BASED ON A LINEAR RESPONSE THEORY

2001 ◽  
Vol 15 (04) ◽  
pp. 321-371 ◽  
Author(s):  
GEN TATARA
Keyword(s):  
Low Temperature ◽  
Domain Wall ◽  
Linear Response ◽  
Quantum Coherence ◽  
Weak Localization ◽  
Linear Response Theory ◽  
Thin Wall ◽  
Response Theory ◽  
Classical Domain ◽  
Wall Interaction

The resistivity due to a domain wall in a ferromagnetic metal is calculated based on a linear response theory. The scattering by impurities is taken into account. The electron-wall interaction is derived from the exchange interaction between the conduction electron and the magnetization by use of a local gauge transformation in the spin space. This interaction is treated perturbatively to the second order. The classical (Boltzmann) contribution from the wall scattering turns out to be negligiblly small if the wall is thick compared with the fermi wavelength. In small contacts a large classical domain wall resistance is expected due to a thin wall trapped in the constriction. In the dirty case, where quantum coherence among electrons becomes important at low temperature, spin flip scattering caused by the wall results in dephasing and hence suppresses weak localization. Thus the quantum correction due to the wall can lead to a decrease of resistivity. This effect grows rapidly at low temperature where the wall becomes the dominant source of dephasing. Conductance change in the quantum region caused by the motion of the wall is also calculated.

scholarly journals Crystalline WO3 nanoparticles for No2 sensing

2020 ◽  
Vol 14 (4) ◽  
pp. 282-292
Author(s):  
Branko Matovic ◽  
Jelena Lukovic ◽  
Dejan Zagorac ◽  
Olga Ivanova ◽  
Alexander Baranchikov ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Low Temperature ◽  
Tungsten Oxide ◽  
Room Temperature ◽  
Sensor Response ◽  
Literature Survey ◽  
Oxide Nanoparticles ◽  
Sensor Signal ◽  
Sensor Properties ◽  
Tungsten Oxide Nanoparticles

This study shows excellent NO2-sensing properties of tungsten oxide nanoparticles, prepared using a facile procedure which includes dissolution of metallic tungsten in hydrogen peroxide with subsequent low-temperature (400 ?C) heating. We also conducted a thorough literature survey on sensor properties of tungsten oxide prepared by various means and found that the sensor response towards NO2 registered in this work achieved the highest level. The most intriguing feature of the material obtained was a highly reproducible sensor signal at room temperature which was more than 100 times higher than any reported previously for WO3. The probable reason for such high sensor response was the presence of two WO3 polymorphs (-WO3 and h-WO3) in the material synthesized using a peroxide-assisted route. In order to further investigate synthesizedWO3 materials, sophisticated experimental (XRD, SEM, TEM, BET) and theoretical (B3LYP, HSE) methods have been used, as well as resistance and sensor response measurements at various temperatures.

Low temperature synthesis and dielectric characterisation of La2Mo2O9 ceramic at RF and microwave frequencies

2020 ◽  
Vol 119 (7) ◽  
pp. 387-392
Author(s):  
Zhuo Xing ◽  
Chengjun Shen ◽  
Changzhi Yin ◽  
Hongjun Ye ◽  
Chunchun Li
Keyword(s):  
Low Temperature ◽  
Low Temperature Synthesis ◽  
Temperature Synthesis ◽  
Microwave Frequencies
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