A5057199838- Analytical Chemistry and Sensors
- Gas Sensing Nanomaterials and Sensors
- Electrochemical Analysis and Applications
- Electrochemical sensors and biosensors
- Advanced Chemical Sensor Technologies
- Force Microscopy Techniques and Applications
- Carbon Nanotubes in Composites
- Microfluidic and Capillary Electrophoresis Applications
- Nanopore and Nanochannel Transport Studies
- Graphene research and applications
- Advanced biosensing and bioanalysis techniques
- Integrated Circuits and Semiconductor Failure Analysis
- Nanofabrication and Lithography Techniques
- Transition Metal Oxide Nanomaterials
- Diamond and Carbon-based Materials Research
- Supercapacitor Materials and Fabrication
- Conducting polymers and applications
- Mechanical and Optical Resonators
- Nanowire Synthesis and Applications
- Advanced Sensor and Energy Harvesting Materials
- Electrocatalysts for Energy Conversion
- Near-Field Optical Microscopy
- Electrowetting and Microfluidic Technologies
- Heat Transfer and Optimization
- Advanced Thermoelectric Materials and Devices
Ulsan National Institute of Science and Technology
2016-2025
Government of the Republic of Korea
2015-2020
University of North Carolina at Chapel Hill
2015
National Institute of Standards and Technology
2014
Georgia Institute of Technology
2003-2010
Ruhr University Bochum
2007
University of Seoul
1998
We report the surface modification of thermoplastic nanochannels and evaluation charge density, zeta potential electroosmotic flow (EOF).
Redox current amplification has been demonstrated using carbon interdigitated array (IDA) nanoelectrodes derived from precursor polymer microstructures through conventional photolithography and pyrolysis. This simple conversion process, also known as carbon-microelectromechanical systems, enables nanometer-level fabrication of materials in a reproducible an economic manner. We that with IDA fabricated two mask processes factor 25 can be obtained. high is result the efficient recycling redox...
We developed a versatile and highly sensitive biosensor platform. The platform is based on electrochemical-enzymatic redox cycling induced by selective enzyme immobilization nano-sized carbon interdigitated electrodes (IDEs) decorated with gold nanoparticles (AuNPs). Without resorting to sophisticated nanofabrication technologies, we used batch wafer-level microelectromechanical systems (C-MEMS) processes fabricate 3D IDEs reproducibly, simply, cost effectively. In addition, AuNPs were...
Facile synthesis of zero-dimensional heterostructures consisting N-doped graphene quantum dots (N-GDs) and SnO<sub>2</sub> nanoparticles is reported for the NO<sub>2</sub> gas sensor with high sensitivity excellent selectivity.
Abstract With the development of nanomaterial-based nanodevices, it became inevitable to develop cost-effective and simple nanofabrication technologies enabling formation nanomaterial assembly in a controllable manner. Herein, we present suspended monolithic carbon single nanowires nanomeshes bridging two bulk posts, fabricated designed manner using successive UV exposure steps pyrolysis step. The step is accompanied with significant volume reduction, resulting shrinkage micro-sized...
This paper presents an energy-efficient intelligent multisensor system for hazardous gases, whose performance can be adaptively optimized through a multimode structure and learning-based pattern recognition algorithm. The operation provides control capability on the tradeoff relationship between accuracy power consumption. In-house microelectro-mechanical (MEMS) devices, with suspended nanowire structure, are manufactured to provide desired characteristics of small size, low power, high...
This article presents the development of a highly sensitive electrochemical heavy metal sensor based on hierarchical porous carbon electrodes with sponge-like edge structures. Micrometer-scale nanoporous were fabricated at wafer-scale using cost-effective batch microfabrication technologies, including microelectromechanical systems technology and oxygen plasma etching. The structure sub-micrometer edges facilitate fast electron transfer rate large active sites, leading to efficient formation...
A batch fabrication process at the wafer-level integrating ring microelectrodes into atomic force microscopy (AFM) tips is presented. The results in bifunctional scanning probes combining with electrochemical (AFM−SECM) a microelectrode integrated defined distance above apex of AFM tip. Silicon carbide used as tip material, resulting reduced mechanical wear for extended usage. presented approach probe based on processing using standard microfabrication techniques, which provides wafer scale...
Redox cycling is a commonly used electrochemical sensing scheme for enhancing faradaic current signals. This effect can be improved by either optimizing electrode geometries or restricting reactions within limited volume. Here, we demonstrate simple batch fabrication of 1 : aspect ratio carbon interdigitated array nanoelectrodes integrated in polydimethylsiloxane microchannel that enables amplification up to 1116 times. We also examine the factors influence redox cycling, including and...
This study presents a novel, ultralow-power single-sensor-based electronic nose (e-nose) system for real-time gas identification, distinguishing itself from conventional sensor-array-based e-nose systems, whose power consumption and cost increase with the number of sensors. Our employs single metal oxide semiconductor (MOS) sensor built on suspended 1D nanoheater, driven by duty cycling─characterized repeated pulsed inputs. The sensor's ultrafast thermal response, enabled its small size,...
This article presents a wide-dynamic-range multi-sensor readout interface for portable environmental monitoring systems with two-step self-optimization schemes. It proposes methods of adaptive range detection and coarse self-cancelation (CSC) current-type sensor interfaces, range-based path control current DAC-based correlated double sampling (CDS) resistive sensing interfaces. Their digital conversions are provided by two kinds high-resolution ADCs, namely, an incremental ΔΣ detector SAR-...