A5050373501- Advanced Sensor and Energy Harvesting Materials
- Tactile and Sensory Interactions
- Advanced Materials and Mechanics
- Micro and Nano Robotics
- Nanomaterials and Printing Technologies
- Muscle activation and electromyography studies
- Neuroscience and Neural Engineering
- Conducting polymers and applications
- Molecular Communication and Nanonetworks
- Interactive and Immersive Displays
- Integrated Circuits and Semiconductor Failure Analysis
- Adhesion, Friction, and Surface Interactions
- Hand Gesture Recognition Systems
- Neurological disorders and treatments
- Advanced Memory and Neural Computing
- Photochromic and Fluorescence Chemistry
- Photoreceptor and optogenetics research
- Non-Invasive Vital Sign Monitoring
- Energy Harvesting in Wireless Networks
- 3D Printing in Biomedical Research
- Nanofabrication and Lithography Techniques
- Hydrogels: synthesis, properties, applications
- Electrostatic Discharge in Electronics
- Gas Sensing Nanomaterials and Sensors
- Green IT and Sustainability
Stanford University
2021-2023
Seoul National University
2015-2022
Government of the Republic of Korea
2020
To overcome the limitation of conventional single axis-strain sensor, we demonstrate a multidimensional strain sensor composed two layers prestrained silver nanowire percolation network with decoupled and polarized electrical response in principal perpendicular directional strain. The information on vector is successfully measured up to 35% maximum large gauge factor (>20). potential proposed as versatile wearable device has been further confirmed.
Abstract State monitoring of the complex system needs a large number sensors. Especially, studies in soft electronics aim to attain complete measurement body, mapping various stimulations like temperature, electrophysiological signals, and mechanical strains. However, conventional approach requires many sensor networks that cover entire curvilinear surfaces target area. We introduce new measuring system, novel electronic skin integrated with deep neural network captures dynamic motions from...
Abstract Development of an artificial camouflage at a complete device level remains vastly challenging task, especially under the aim achieving more advanced and natural characteristics via high-resolution patterns. Our strategy is to integrate thermochromic liquid crystal layer with vertically stacked, patterned silver nanowire heaters in multilayer structure overcome limitations conventional lateral pixelated scheme through superposition heater-induced temperature profiles. At same time,...
The patterning of poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) hydrogels with excellent electrical property and spatial resolution is a challenge for bioelectronic applications. However, most PEDOT:PSS are fabricated by conventional manufacturing processes such as photolithography, inkjet printing, screen printing complex fabrication steps or low resolution. Moreover, the additives used fabricating mostly cytotoxic, thus requiring days detoxification. Here, we...
ABSTRACT Soft electromechanical sensors have led to a new paradigm of electronic devices for novel motion-based wearable applications in our daily lives. However, the vast amount random and unidentified signals generated by complex body motions has hindered precise recognition practical application this technology. Recent advancements artificial-intelligence technology enabled significant strides extracting features from massive intricate data sets, thereby presenting breakthrough utilizing...
Abstract Pressure-sensitive touch panels can measure pressure and location (3D) information simultaneously provide an intuitive natural method for expressing one’s intention with a higher level of controllability interactivity. However, they have been generally realized by simple combination sensor or stylus-based interface, which limit their implementation in wide spectrum applications. Here, we report first demonstration (to our knowledge) transparent flexible 3D sense the single device...
The recent development of human–machine interface (HMI) involves advances in wearable devices that safely interact with the human body while providing high mechanical compliance. Various cutting‐edge technologies such as highly stretchable electronics, multiple sensor fusion, and exoskeletons have enabled a higher level interactivity. Notably, developments using machine intelligence achieved unprecedented performance solved various challenges. Herein, progresses HMI including sensors,...
Abstract Latest developments in thin‐film electronics have put skin the limelight. Integration of multiple sensors and wireless power transferring ability are cardinal components for continuous acquisition human signals, enabling higher level applications wearable healthcare AR/VR devices. Skin sensor is considerably influenced by target body parts users where it attached, thus face various design adjustments best performance. However, most using conventional fabrication methods a fixed...
Photolithography is a well-established fabrication method for realizing multilayer electronic circuits. However, it challenging to adopt photolithography fabricate intrinsically stretchable circuits fully composed of an elastomeric matrix, due the opacity thick nanocomposite conductors. Here, we present photothermal lithography that can pattern conductors and via holes using pulsed lasers. The photothermal-patterned conductor exhibits 3 times higher conductivity (5940 S cm-1) 5 orders...
Various cracking methods and its applications for transparent conductors, sensors, microfluidics.
Abstract Bioelectronic fibers hold promise for both research and clinical applications due to their compactness, ease of implantation, ability incorporate various functionalities such as sensing stimulation. However, existing devices suffer from bulkiness, rigidity, limited functionality, low density active components. These limitations stem the difficulty many components on one-dimensional (1D) fiber incompatibility conventional microfabrication methods (e.g., photolithography) with curved,...
With the rapid development of wearable devices, healthcare technologies that enable an accurate monitoring electrophysiological signals and provide electrical stimulation for therapy are extensively researched. In this regard, 1D nanomaterials widely used in bioelectronics owing to their advantageous properties such as transparency, mechanical flexibility, stretchability. Herein, recent advances bioelectronic devices based on reviewed with a focus biocompatibility frequently devices....
Abstract Evolution has decided to gift an articular structure vertebrates, but not invertebrates, owing their distinct survival strategies. An permits kinematic motion in creatures. However, it is inappropriate for creatures whose strategy depends on the high deformability of body. Accordingly, a material which presence can be altered, allowing use two contradictory strategies, will advantageous diverse dynamic applications. Herein, spatial micro‐water molecule manipulation, termed...
Bioelectronics has been developed to acquire knowledge about electrophysiological modulation of in vitro cultured cells, as well for therapeutic devices which can manage disease through implantation. Along with biocompatibility issues, various 1D nanomaterial-based bioelectronic applications are discussed article number 2100111 by Wonryung Lee, Hojeong Jeon, Seung Hwan Ko, and co-workers.
The recent new developments in soft robotics involve advances imperceptible robots with transparent actuators/sensors as well camouflage skins that have made it possible to construct can function a visually and mechanically unobstructed manner, assisting the operations of creating more applications various fields. These are reviewed by Seung Hwan Ko co-workers article number 2002397.
This paper presents the fabrication and characterization of multi-dimensional strain sensor that is capable quantitative determination characteristics can imitate various surface properties. In this study, we demonstrated composed two interlocked layers pre-strained silver nanowire network which detecting transverse longitudinal separately. By acquiring independent electrical signals, amplitude effective direction are calculated with high stretchability (>35%), good stability, large gauge...
Skin Electronics In article number 2106329, Seung Hwan Ko and co-workers report a rewritable wearable electronics manufacturing platform that is capable of simultaneously evolving its structure by laser direct drawing erasing. This device concurrently adapts to change in users purpose the making optimization, modification, expansion, which further applied measuring human physiological signals motions.
Pressure-sensitive touch panels provide an intuitive and natural method to sketch write with new levels of control interactivity. However, they require a combination sensors or stylus-based interface identify 3D signals, which prevents their implementation in wide spectrum applications. Here, we report transparent flexible operates single device the assistance multiscale structures nanowire percolation network. The could assign functionalities objects without reference any varying surfaces....
Human–Machine Interfaces In article number 2002286, Seung Hwan Ko and co-workers review the cutting edge of wearable devices. Recent development untethered devices consists a range cutting-edge technologies such as electromagnetic, triboelectric, thermoelectric energy harvesting. advances in bio-fuel-based electronics show numerous solutions to remaining practical issues continuous measurement without an external power source. Key advancements various sources are introduced with their...
Spatial Micro-Water Manipulation An octopus with homogeneously soft structure can easily hide in rocks, where an athlete throw javelin precisely controlled manner thanks to the articular structure. Nature designed these distinctive structures by adjusting amount of water inside. For taking both their kinematics, spatial micro-water molecule manipulation maneuvers hydrogel enabling alteration between two structures. More details be found article number 2102536 Seung Hwan Ko and co-workers.