A5053615125- Acoustic Wave Resonator Technologies
- Gas Sensing Nanomaterials and Sensors
- Analytical Chemistry and Sensors
- Advanced MEMS and NEMS Technologies
- Mechanical and Optical Resonators
- Neuroscience and Neural Engineering
- Advanced Chemical Sensor Technologies
- Quantum Dots Synthesis And Properties
- ZnO doping and properties
- Chalcogenide Semiconductor Thin Films
- Advanced optical system design
- Advanced Memory and Neural Computing
- EEG and Brain-Computer Interfaces
- Optical Coatings and Gratings
- Conducting polymers and applications
- Perovskite Materials and Applications
- Magnetic Field Sensors Techniques
- Advanced Optical Imaging Technologies
- Semiconductor Lasers and Optical Devices
- Antenna Design and Analysis
- Nanofabrication and Lithography Techniques
- Microwave Engineering and Waveguides
- Magneto-Optical Properties and Applications
- Advanced Sensor and Energy Harvesting Materials
- solar cell performance optimization
Ajou University
2016-2025
Suwon Research Institute
2015
Government of the Republic of Korea
2015
Arizona State University
2004
Metal oxide nanostructures are the most promising materials for fabrication of advanced gas sensors. However, main challenge these sensors is humidity interference and issues related to selectivity high operating temperature, which limits their response in real-time applications. In this study, we proposed nanohybrids Pt-functionalized Al2O3/ZnOcore-shell nanorods (NRs) a humidity-independent acetylene sensor. The core ZnO NRs have been fabricated on microelectromechanical system (MEMS)...
In this research, a highly sensitive and selective hydrogen gas sensor was developed based on Cu-doped SnO2. Sensing characteristics were compared SnO2 doped with different concentrations of Cu, the highest sensitivity fastest response time shown when 3% Cu contained. A 3D structure formed using polystyrene to increase surface-to-volume ratio, which allows more oxygen molecules bond surface sensing material. Extremely increased observed as planar structure. temperature micro-heater...
A 440 MHz wireless and passive surface acoustic wave (SAW) chemical sensor was developed for CO2 detection. The SAW gas is composed of single phase unidirectional transducers (SPUDTs), three shorted grating reflectors, CO2-sensitive polymer film on 41° YX LiNbO3 substrate. Coupling modes (COM) modeling used to find optimal design parameters. Using the extracted parameters, device fabricated. Teflon AF 2400 as sensitive because it provides high solubility, permeability selectivity. In testing...
Currently existing common conjugated polymer:PbS quantum dot (QD)-based hybrid bulk heterojunction (BHJ) solar cells show efficiencies of less than 1% owing to improper bandgap alignment and poor coupling at the material interfaces. However, herein we report that PbS QD-based BHJ provide greatly increased more 3%, which is attributed employment a new kind donor polymer poly[2,6-(4,4′-bis(2-ethylhexyl)dithieno[3,2-b:2′,3′-d]silole)-alt-4,7(2,1,3-benzothiadiazole) (PSBTBT), optimization...
Reduced graphene oxide and molybdenum disulfide (rGO:MoS2) are the most representative two-dimensional materials, which promising for a humidity sensor owing to its high surface area, large number of active sites, excellent mechanical flexibility. Herein, we introduced highly sensitive stable rGO:MoS2-based integrated with low-power in-plane microheater temperature sensor, directly insertable transformer insulating oil, analyzed by newly developed customized interface electronics monitor...
This study pioneers a chemical sensor based on surfactant-free aerosol-synthesized single-walled carbon nanotube (SWCNT) films for detecting nitrogen dioxide (NO
This paper presents the development of a 440 MHz range surface acoustic wave (SAW)-based microsensor integrated with pressure–temperature sensors and ID tag. Two piezoelectric substrates were bonded, in which ∼150 µm air gap was structured by metal poles. The pressure sensor placed on top substrate, whereas tag temperature located bottom substrate. Coupling modes (COM) modeling used to find optimal design parameters. Using extracted parameters, SAW device fabricated. In wireless testing...
Abstract This review gives an overview of the development surface acoustic wave (SAW) based gyroscopes. Different types SAW gyroscope are first presented, which categorized into standing-wave or progressive-wave gyroscopes according to their respective mechanisms. In addition, multi-axis detectable also introduced in this review. principles, structures, production methods, and control technologies analyzed.
A strain measurement system based on a shear horizontal surface acoustic wave (SH SAW) was developed. The developed is composed of SAW microsensor, printed circuit board (PCB), an adhesive and gauge. When compression force applied to the PCB by gauge, bent so that external energy can be evenly delivered microsensor without any detachment sensor from board. stretching under condition one side fixed other modulated, actual length delay line between two interdigital transducers (IDTs)...
A chipless, wireless current sensor system was developed using a giant magnetoimpedance (GMI) magnetic and one-port surface acoustic wave (SAW) reflective delay line for real-time power monitoring in current-carrying conductor. The GMI has high-quality crystalline structure each layer, which contributes to high sensitivity good linearity field of 3-16 Oe. 400 MHz RF energy generated from the interdigital transducer (IDT)-type reflector on SAW used as an activation source sensor. replaces...
Abstract A surface acoustic wave (SAW)‐based hydrogen sensor and its corresponding interface electronics have been developed to measure the concentration in air at room temperature. Two SAW delay lines with center frequencies of 284 284.3 MHz are employed for system eliminate any environmental disturbances emerging from temperature humidity variations on a output. beehive‐configured Cu‐doped SnO 2 nanostructure is used as hydrogen‐sensitive material high volume ratio, sensitivity,...
This study presents a novel surface acoustic wave (SAW)-based solar-blind ultraviolet-C (UV-C) corona sensor, marking the first reported use of HfO₂ as sensing material for UV-C sensing. A 222 MHz two-port SAW delay line structure was selected sensor platform, and its optimal parameters were determined through Coupling Mode (COM) modeling analysis. COMSOL simulations conducted to investigate effect exposure on HfO2 thin film, highlighting contribution conductivity changes. 30 nm-thick film...
A surface acoustic wave-based NO2 sensor and its interface electronics, utilizing monolayered two-dimensional sensing materials, were developed for internal pollution monitoring in spacecraft. The system consists of a two-port SAW delay line with graphene/MoS2 flakes the cavity region between two interdigital transducers, along electronics. microheater was integrated adjacent to maintain stable temperature field on surface, thereby enhancing sensitivity, response/recovery times, selectivity....
In this paper, we present a novel microelectromechanical system-interdigital transducer (MEMS-IDT) surface acoustic wave (SAW) gyroscope with an 80 MHz central frequency on 128° YX LiNbO3 wafer. The developed MEMS-IDT is composed of two-port SAW resonator, dual delay line oscillator, and metallic dots. resonator provides stable standing wave, the vibrating dot at antinode induces second in normal direction its axis. oscillator detects Coriolis force by comparing resonant frequencies between...