A5100626275- Conducting polymers and applications
- Organic Electronics and Photovoltaics
- Surface Modification and Superhydrophobicity
- Anodic Oxide Films and Nanostructures
- Advanced Sensor and Energy Harvesting Materials
- Electric Vehicles and Infrastructure
- Carbon Nanotubes in Composites
- Microstructure and Mechanical Properties of Steels
- Engineering Applied Research
- Corrosion Behavior and Inhibition
- Electrowetting and Microfluidic Technologies
- Semiconductor materials and devices
- Advanced Battery Technologies Research
- Analytical Chemistry and Sensors
- Microfluidic and Capillary Electrophoresis Applications
- Force Microscopy Techniques and Applications
- Mechanical and Optical Resonators
- Nanofabrication and Lithography Techniques
- Microfluidic and Bio-sensing Technologies
- Mobile Ad Hoc Networks
- Organic Light-Emitting Diodes Research
- Transportation and Mobility Innovations
- Adhesion, Friction, and Surface Interactions
- Modular Robots and Swarm Intelligence
- Magnesium Alloys: Properties and Applications
Pukyong National University
2018-2025
Seoul National University
2015-2024
Dongseo University
2018-2024
Yonsei University
2022-2024
Helmholtz-Zentrum Hereon
2024
Jeju National University
2011-2023
Institute for Basic Science
2023
Stevens Institute of Technology
2015-2022
Sogang University
2022
Chonnam National University
2021
The apparent contact angle on a rough surface is usually modeled by either Cassie's or Wenzel's theory. We show, the basis of experimental evidence, that there can be two angles same surface, depending how drop formed. A transition occur between different states an external disturbance. This paper compares theoretical prediction with matching experiments. leads to establishment design criterion for robust hydrophobic which will not change as result
Ambipolar polymer semiconductors are highly suited for use in flexible, printable, and large-area electronics as they exhibit both n-type (electron-transporting) p-type (hole-transporting) operations within a single layer. This allows cost-effective fabrication of complementary circuits with high noise immunity operational stability. Currently, the performance ambipolar lags behind that their unipolar counterparts. Here, we report on side-chain engineering conjugated, alternating electron...
There is a fast-growing demand for polymer-based ambipolar thin-film transistors (TFTs), in which both n-type and p-type transistor operations are realized single layer, while maintaining simplicity processing. Research progress toward this end essentially fueled by molecular engineering of the conjugated backbones polymers development process architectures device fabrication, has recently led to hole electron mobilities more than 1.0 cm(2) V(-1) s(-1). However, with even higher performance...
Bacterial adhesion and biofilm formation on surfaces are troublesome in many industrial processes. Here, nanoporous nanopillared aluminum were engineered by anodizing postetching processes made hydrophilic (using the inherent oxide layer) or hydrophobic (applying a Teflon coating) with aim of discouraging bacterial adhesion. Adhesion Staphylococcus aureus ATCC 12600 (Gram-positive, spherically shaped) Escherichia coli K-12 (Gram-negative, rod-shaped) was evaluated to nanoengineered under...
This paper describes the first microelectromechanical systems (MEMS) demonstration device that adopts surface tension as driving force. A liquid-metal droplet can be driven in an electrolyte-filled capillary by locally modifying with electric potential. We explore this so-called continuous electrowetting phenomenon for MEMS and present crucial design fabrication technology reduce surface-tension-driving principle, inherently powerful microscale, into practice. The key issues are identified...
An extreme water-repellent surface is designed and fabricated with a hierarchical integration of nano- microscale textures. We combined the two readily accessible etching techniques, standard deep silicon etching, gas phase isotropic (XeF2) for uniform formation double roughness on surface. The synthetic shows hallmarks Lotus effect: durable super water repellency (contact angle>173 degrees) sole existence Cassie state even very large spacing between structures (>1:7.5). directly demonstrate...
The major drawback of current passivation techniques for preventing corrosion is the lack ability to withstand any external damages or local defects. In this study, oil‐impregnated nanoporous anodic aluminum oxide (AAO) layers are investigated overcome such limitations and thus advance protection. By completely filling hydrophobized nanopores with oil via a solvent exchange method, highly water‐repellent surface that prevents penetration corrosive media into AAO layer hence achieved....
Based on the integrated consideration and engineering of both conjugated backbones flexible side chains, solution‐processable polymeric semiconductors consisting a diketopyrrolopyrrole (DPP) backbone finely modulated branching chain ( ε ‐branched chain) are reported. The subtle change in point from alters π−π stacking lamellar distances between polymer backbones, which has significant influence charge‐transport properties turn performances field‐effect transistors (FETs). In addition to...
Abstract A narrow bandgap polymeric semiconductor, BOC‐PTDPP , comprising alkyl substituted diketopyrrolopyrrole (DPP) and tert ‐butoxycarbonyl ( t ‐BOC)‐protected DPP, is synthesized used in organic field‐effect transistors (OFETs). The polymer films are prepared by solution deposition thermal annealing of precursors featuring thermally labile ‐BOC groups. effects the cleavage on molecular packing structure thin investigated using thermogravimetric analysis (TGA), UV‐vis spectroscopy,...
Abstract Systematic creation of polymeric semiconductors from novel building blocks is critical for improving charge transport properties in organic field‐effect transistors (OFETs). A series ultralow‐bandgap polymers containing thienoisoindigo (TIIG) as a thiophene analogue isoindigo (IIG) synthesized. The UV‐Vis absorptions the TIIG‐based ( PTIIG‐T , PTIIG‐Se and PTIIG‐DT ) exhibit broad bands covering visible to near‐infrared range up 1600 nm. All unipolar p‐channel operations with regard...
Over the past decade, demand for high-performance wearable sensors has increased because of their capability interaction with humans. Such have typically been prepared on conventional substrates, such as silicon, PDMS, and copper mesh. In this work, we propose a class fabricated from reduced graphene oxide (rGO) patterned paper substrates (rGO-paper). These rGO-paper are highly sensitive to various deformations capable measuring bending folding angles small 0.2° 0.1°, respectively. We...
Nanoporous anodic aluminum oxide layers were fabricated on substrates with systematically varied pore diameters (20–80 nm) and thicknesses (150–500 by controlling the anodizing voltage time subsequent pore-widening process conditions. The porous nanostructures then coated a thin (only couple of nanometers thick) Teflon film to make surface hydrophobic trap air in pores. corrosion resistance substrate was evaluated potentiodynamic polarization measurement 3.5 wt % NaCl solution (saltwater)....
Organic ambipolar transistor arrays for chemical sensors are prepared on a flexible plastic substrate with bottom-gate bottom-contact configuration to minimize the damage organic semiconductors, first time, using photolithographically patternable polymer semiconductor. Well-balanced charge transport is achieved by introducing graphene electrodes because of reduced contact resistance and energetic barrier electron transport. As service our authors readers, this journal provides supporting...
To systematically address the intriguing question of how siloxane termini side chains relative to alkyl-terminal groups affect various inherent properties conjugated polymers—including optical, electrical, and morphological characteristics—we have synthesized model polymers (PDPPTT-RTG PDPPTT-SiTG, together with an accompanying reference PDPPTT-ref) containing identical backbone yet possessing different terminal groups. In order fairly compare end functionalities by eliminating molecular...
A lubricant-infused surface such as an oil-impregnated porous has great potentials for various applications due to its omniphobicity. However, the drainage and depletion of lubricant liquid oil remain practical concerns real applications. Here, we investigate effect a specially designed bottle-shaped nanopore anodic aluminum oxide, which smaller pore diameter in upper region than lower one, on retentivity anti-corrosion efficacy. The effects viscosity volatility were further investigated...