A5101935879- Advanced Sensor and Energy Harvesting Materials
- Magnetic properties of thin films
- Magnetic Field Sensors Techniques
- Tactile and Sensory Interactions
- Characterization and Applications of Magnetic Nanoparticles
- Surface Modification and Superhydrophobicity
- Muscle activation and electromyography studies
- Magneto-Optical Properties and Applications
- Advanced biosensing and bioanalysis techniques
- Microfluidic and Bio-sensing Technologies
- Physics of Superconductivity and Magnetism
- Ferroelectric and Negative Capacitance Devices
- Micro and Nano Robotics
- Electronic Packaging and Soldering Technologies
- Molecular Junctions and Nanostructures
- Graphene and Nanomaterials Applications
- Solar-Powered Water Purification Methods
- ZnO doping and properties
- Nanomaterials and Printing Technologies
- Recycling and Waste Management Techniques
- Analytical Chemistry and Sensors
- Advanced MEMS and NEMS Technologies
- EEG and Brain-Computer Interfaces
- Phytoplasmas and Hemiptera pathogens
- Pickering emulsions and particle stabilization
Korea Institute of Machinery and Materials
2014-2023
Sungkyunkwan University
2022
Chungnam National University
2009-2013
Western Digital (United States)
2008
Samsung (South Korea)
2004
We have presented a biological and eco-friendly method for the synthesis of gold nanoparticles from precursor (HAuCl4) using Sapindus mukorossi Gaertn. fruit pericarp (soapnut shells). investigate production as function concentration HAuCl4 amount soapnut shells. Average nanoparticle sizes 9, 17, 19 nm were obtained by concentrations 1, 5, 10 mM, respectively, with fixed shells extract. The resulted are highly crystalline face-centered cubic (fcc) structures. FT–IR analysis suggests that...
In order to realize a transition from conventional stretchable electronics, it is necessary make universal circuit board in which passive/active components can be robustly integrated. We developed printed (s-PCB) platform that enables easy and reliable integration of various electronic by utilizing modulus-gradient polymeric substrate, liquid metal amalgam (LMA) traces, Ag nanowire (AgNW) contact pads. Due the LMA-AgNW biphasic structure interconnection, LMA hermetically sealed homogeneous...
A trilayer structure, which has weak exchange coupling and high active current, been optimized emphasizing for field-sensitivity planar Hall effect (PHE) sensor. To illustrate the field sensitivity of PHE sensor, three different structures are fabricated: a bilayer thin film Ta(3)/NiFe(10)/IrMn(10)/Ta(3) (nm), spin-valve Ta(3)/NiFe(10)/Cu(1.2)/NiFe(2)/IrMn(10)/Ta(3) Ta(3)/NiFe(10)/Cu(0.12)/IrMn(10)/Ta(3) (nm). The characterized results reveal that sensor based on is about one order larger...
High sensitive flexible and wearable devices which can detect delicate touches have attracted considerable attentions from researchers for various promising applications. This research was aimed at enhancing the sensitivity of a MWCNT/PDMS piezoresistive tactile sensor through modification its surface texture in form micropillars on film subsequent low energy Ar+ ion beam treatment micropillars. The introduction straight increased under gentle touch. Low performed to induce stiff layer...
We have investigated the sensitivity of a planar Hall resistance sensor as function ring radius in trilayer structure Ta(3)/IrMn(10)/Cu(0.2)/NiFe(10)/Ta(3) (nm). The diagonal components magnetoresistivity tensor rectangular prism corresponding to anisotropic magnetoresistance are few ten times larger than that off-diagonal component resistance. However, it is noteworthy resultant contribution governed by due cancellation self-balanced bridge configuration. Both experimental and theoretical...
Mechanoreceptors in a fingertip convert external tactile stimulations into electrical signals, which are transmitted by the nervous system through synaptic transmitters and then perceived brain with high accuracy reliability. Inspired human synapse system, this paper reports robust sensing consisting of remote touch tip magnetic synapse. External pressure on is transferred form air to synapse, where its variation converted signals. The developed has sensitivity wide dynamic range....
In this study, a parasitic capacitance-free tactile sensor with floating electrode that is capable of identifying actual physical contact pressure by distinguishing from effects and applicable to arrays presented. Although capacitive sensors are known for their excellent sensing capabilities in wide range high sensitivity, they tend suffer capacitance noise unwanted proximity effects. Electromagnetic interference shielding was conventionally used prevent noise; however, it not entirely...
We report on the enhancement of exchange field, Hex , in IrMn/CoFe systems as a result application field annealing procedures. The is enhanced up to 37% 2 Tesla for 90 minutes at 225degC. This setting process improves magnitude H <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">EX</sub> without significant changes coercivity, xmlns:xlink="http://www.w3.org/1999/xlink">C</sub> or median blocking temperature. sample with largest bias measured, 3.7...
This paper introduces a simple method of water collection by increasing the coalescence effects in dropwise condensation with use microscale holes. The tiny holes modified surface free energy states droplets on plate, yielding barrier between flat solid and spatial difference enabled to move toward adjacent droplets, thus possibility coalescence. experiments were performed using Peltier-based cooling system at 2 °C inside chamber 30 70% humidity. results demonstrated that perforated plates...
A human can intuitively perceive and comprehend complicated tactile information because the cutaneous receptors distributed in fingertip skin receive different stimuli simultaneously signals are immediately transmitted to brain. Although many research groups have attempted mimic structure function of skin, it remains a challenge implement human-like perception process inside one system. In this study, we developed real-time multimodal system that mimics transduction from brain, by using...
Durability and multifunctionality are very important factors for human skinlike tactile sensors measuring physical stimuli if they provide reasonable pressure measurement range sensitivity. Here, we propose a step sensor with simple processing unit, showing high repeatability mechanical stability without drifting caused by thermal geometrical noise. The proposed sensor, similar to switch mechanism, detects the applied discretely has wide of 2 kPa 1.2 MPa according its geometry. developed can...
We have investigated the planar Hall effect (PHE) in three multilayer structures such as a bilayer, spin-valve and weak exchange bias coupling bilayer structure introduced very thin Cu spacer layer between antiferromagnetic ferromagnetic layers. These films are Ta(3)/NiFe(10)/IrMn(10)/Ta(3) (nm), Ta(3)/NiFe(10)/Cu(1.2)/NiFe(2)/IrMn(10)/Ta(3) Ta(3)/NiFe(10)/Cu(0.2)/IrMn(10)/Ta(3) respectively. The active layers all were kept constant. field-sensitivity of fabricated PHE sensors obtained for...
Integrating tactile sensors into robotic applications is still a challenge because of sensor interconnection and various form factors. Newly developed magnetic synapse have high sensitivity remote sensing capability, but integration with finger an issue the air-transmitting tubes that need to be connected from remotely located base unit. This study proposes integrated design multijoint inspired by human's joint structure system. The unit joints for usage can easily has hollow channels insert...
A set of planar Hall resistance (PHR) sensors was fabricated on rigid and flexible substrates.High signal-to-noise ratio,low offset voltage,nearly zero hysteresis signal,and excellent linearity were demonstrated for sensors,based Ta (5 nm)/NiFe (10 nm)/IrMn nm)/Ta nm) thin films, grown polydimethylsiloxane (PDMS) parylene C polymeric substrates. The effect bending the performance PHR studied. deformation characteristics is reversible until angle reaches a critical one. shown to depend...
A controlled magnetic field creates patterns of superparamagnetic nanoparticles with a minimum line width 10 μm on flexible substrate. This printing method is also successfully used to print conductive consisting copper or carbon nanomaterials.
Planar Hall effect sensor has been explored using multi-layer cross-shaped and bridge geometry. We present planar in a ring-shaped geometry experimentally that shows progress of sensitivity as well output signals. Sensitivity improves about 170 times compare to 1.4 conventional measurement system. These values become 2.5 larger at 20o The presented ring may take great potential applications.