A5041076066- Advanced Sensor and Energy Harvesting Materials
- Advanced Materials and Mechanics
- Advanced MEMS and NEMS Technologies
- Mechanical and Optical Resonators
- Nanofabrication and Lithography Techniques
- Nanomaterials and Printing Technologies
- Force Microscopy Techniques and Applications
- Modular Robots and Swarm Intelligence
- Surface Modification and Superhydrophobicity
- Photonic Crystals and Applications
- Additive Manufacturing and 3D Printing Technologies
- Near-Field Optical Microscopy
- Conducting polymers and applications
- Photonic and Optical Devices
- Adhesion, Friction, and Surface Interactions
- Nanowire Synthesis and Applications
- Optical Coatings and Gratings
- Tactile and Sensory Interactions
- Neuroscience and Neural Engineering
- Interactive and Immersive Displays
- Polymer composites and self-healing
- Advanced Memory and Neural Computing
- Analytical chemistry methods development
- Electrochemical sensors and biosensors
- Laser-induced spectroscopy and plasma
Korea Institute of Industrial Technology
2021-2025
Kyungpook National University Hospital
2024
Korea Research Institute of Bioscience and Biotechnology
2023
Daegu Gyeongbuk Institute of Science and Technology
2023
Korea Advanced Institute of Science and Technology
2023
Gwangju Institute of Science and Technology
2023
Korea Brain Research Institute
2023
Yonsei University
2023
University of California, San Diego
2023
Jeonbuk National University
2023
We report classes of electronic systems that achieve thicknesses, effective elastic moduli, bending stiffnesses, and areal mass densities matched to the epidermis. Unlike traditional wafer-based technologies, laminating such devices onto skin leads conformal contact adequate adhesion based on van der Waals interactions alone, in a manner is mechanically invisible user. describe incorporating electrophysiological, temperature, strain sensors, as well transistors, light-emitting diodes,...
Curved surfaces, complex geometries, and time-dynamic deformations of the heart create challenges in establishing intimate, nonconstraining interfaces between cardiac structures medical devices or surgical tools, particularly over large areas. We constructed area designs for diagnostic therapeutic stretchable sensor actuator webs that conformally wrap epicardium, robust contact without sutures, mechanical fixtures, tapes, adhesives. These multifunctional web exploit open, mesh layouts mount...
Proper healing of incised skin is critical to the natural processes tissue repair. Concepts in flexible silicon electronics enable integration actuators, sensors and a variety semiconductor devices onto thin strips plastic or biopolymers, yield 'instrumented' suture threads for monitoring accelerating wound this context. Bifacial systems type demonstrate various classes functionality, live animal models. Detailed modelling mechanics reveals stress strain distributions such applications,...
Scalable and cost-effective protocols to pattern integrate colloidal quantum dots (QDs) with high resolution have been challenging establish. While their solubility can facilitate certain processes such as spin-casting into thin films, it also makes them incompatible many conventional patterning techniques including photolithography that require solution processing. In this work, we present "photoresist (PR) contact patterning", a dry means QD films over large areas while maintaining desired...
Dry transfer printing by using atomic diffusion control enables multiscale and deterministic assembly of electronic devices.
During dynamic atomic force microscopy (AFM), the deflection of a scanning cantilever generates multiple frequency terms due to nonlinear nature AFM tip-sample interactions. Even though each term is reasonably expected encode information about sample, only fundamental typically decoded provide topographic mapping measured surface. One main reasons for discarding higher harmonic signals their low signal-to-noise ratio. Here, we introduce new design concept multi-harmonic AFM, exploiting...
Abstract Metamaterials have made the exotic control of flow electromagnetic waves possible, which is difficult to achieve with natural materials. In recent years, emergence functional metadevices has shown immense potential for practical realization highly efficient photonic devices. However, complex and heterogeneous architectures that enable diverse functionalities metamaterials been challenging realize because limited manufacturing capabilities conventional fabrication methods. Here, we...
We present a micromanufacturing method for constructing microsystems, which we term 'micro-masonry' based on individual manipulation, influenced by strategies deterministic materials assembly using advanced forms of transfer printing. Analogous to masonry in construction sites, micro-masonry consists the preparation, and binding microscale units assemble microcomponents microsystems. In this paper, purpose demonstration, used microtipped elastomeric stamps as manipulators built three...
Here we demonstrate, via a modified transfer-printing technique, that electrochemically fabricated porous silicon (PSi) distributed Bragg reflectors (DBRs) can serve as the basis of high-quality hybrid microcavities compatible with most forms photoemitters. Vertical consisting an emitter layer sandwiched between 11- and 15-period PSi DBRs were constructed. The included polymer doped PbS quantum dots, well heterogeneous GaAs thin film. In this structure, emission was significantly...
Hydrophobic–hydrophilic hybrid surfaces, sometimes termed biphilic have shown potential to enhance condensation and boiling heat transfer, anti-icing, fog harvesting performance. However, state of art techniques develop these surfaces limited substrate selection, poor scalability, lengthy costly fabrication methods. Here, we a simple, scalable, rapid stamping technique for with spatially controlled wettability. To enable stamping, rationally designed prefabricated polydimethylsiloxane (PDMS)...
Abstract Enabling unique architectures and functionalities of microsystems for numerous applications in electronics, photonics other areas often requires microassembly separately prepared heterogeneous materials instead monolithic microfabrication. However, dissimilar while ensuring high structural integrity has been challenging the context deterministic transferring joining at microscale where surface adhesion is far more dominant than body weight. Here we present an approach to assembling...
Wearable electronics for the Internet of Things (IoT) have spurred interest in optimizing stretchable substrates, electrodes, and sensing materials. Specifically, wearable gas sensors are valuable real-time monitoring hazardous chemicals. For sensors, a stable operation under mechanical deformation is required. Here, we introduce strain-insensitive Kirigami-structured decorated with titanium dioxide (TiO2) functionalized carbon nanotubes (CNTs) NO2 sensing. The Kirigami-shaped substrate used...
Structures such as 3D buckling have been widely used to impart stretchability devices. However, these structures limitations when applied piezoelectric devices due the uneven distribution of internal strain during deformation. When strains with opposite directions simultaneously affect materials, electric output can decrease cancellation. Here, we report an electrode design tailored direction and a circuit configuration that prevents These designs not only provide nanogenerators (PENGs) but...
Abstract Precise monitoring of neurotransmitters, such as dopamine (DA), is critical for understanding brain function and treating neurological disorders since dysregulation DA implicates in a range disorders, including Parkinson's disease (PD), schizophrenia, addiction. This study proposes multi‐deformable double‐sided (MDD) DA‐sensing probe with the three‐electrode system all‐in‐one form reliable real‐time dynamics by integrating working, reference, counter electrodes on single probe. The...
We report deterministic assembly of 100 nm thick suspended gold films using transfer printing that are mechanically collapsible. demonstrate the latter electrostatic force to establish and break physical contact between film a silicon dioxide substrate in reversible repeatable manner. Modeling thermal conductance at interface substrate, we show fabricated structure behaves as switch. The on-state corresponds collapsed off-state fully film. on- ratio for exceeds 106 theory.
This paper presents the electrical and morphological properties at interface between a metal (Au) semiconductor (Si) formed by novel transfer-printing technology. work shows that transfer-printed thin (hundreds of nanometers) Au film forms excellent contact on Si substrate when appropriate thermal treatment is applied. The successful attributed to eutectic joining, which allows for right amount atomic level mass transport Si. outcomes suggest transfer-printing-based micromanufacturing can...
Micro-masonry is a route to microassembly that involves elastomeric-stamp-based micromanipulation and direct bonding. This paper presents the assembly of MEMS mechanical sensors actuators using micro-masonry, demonstrating its capability constructing 3-D microdevices are impossible or difficult realize with monolithic microfabrication. Microfabrication processes for retrievable components (e.g., combs, spacers, flexure beams) developed. As tools, microtipped elastomeric stamps reversible dry...
Advantages of using nanoscale membrane and plate resonators over more common cantilever shapes include higher quality factor (Q factor) for an equivalent mass better suitability to sensing applications in fluid. Unfortunately, the current fabrication methods used obtain such membranes plates are limited terms materials thickness range, can potentially cause stiction. This study presents a new method fabricate nanoplate resonating structures based on micro-masonry, which is advanced form...
We present a two-axis electrostatic MEMS scanner with high-reflectivity monolithic single-crystal-silicon photonic crystal (PC) mirrors suitable for applications in harsh environments. The reflective surfaces of the are transfer-printed PC low polarization dependence, angular and reflectivity over 85% wavelength range 1490nm~1505nm above 90% band 1550~1570nm. In static mode, has total scan 10.2° on one rotation axis 7.8° other. Dynamic operation resonance increase to 21° at 608Hz around...
Intentional utilization of geometric nonlinearity in micro/nanomechanical resonators provides a breakthrough to overcome the narrow bandwidth limitation linear dynamic systems. In past works, implementation intentional an otherwise nano/micromechanical resonator has been successfully achieved by local modification system through nonlinear attachments nanoscale size, such as nanotubes and nanowires. However, conventional fabrication method involving manual integration components produced low...