Hyunjung Yi

  • Citations Per Year
Learn More
Although volatile organic compounds (VOCs) are becoming increasingly recognized as harmful agents and potential biomarkers, selective detection of the organic targets remains a tremendous challenge. Among the materials being investigated for target recognition, peptides are attractive candidates because of their chemical robustness, divergence, and their(More)
A hydrodynamic phenomenon is used to assemble a large-scale conductive nanomesh of single-walled carbon nanotubes (SWNTs) with exceptional control of the nanostructure. This is accomplished by a biological material with nanoscale features and a strong binding affinity toward SWNTs. The biological material also presents a unique glue effect for the assembly.(More)
This paper presents a portable low-cost biosensor platform for ion-sensitive field-effect transistor (ISFET) and enzyme-based sensors. To meet various demands of diagnosis, our portable platform is designed to perform cyclic voltammetry, amperometry, and linear sweep voltammetry for enzyme-based sensor and ISFET sensor. For compatibility with various(More)
Nondestructive assembly of a nanostructured enzyme platform is developed in combination of the specific biomolecular attraction and electrostatic coupling for highly efficient direct electron transfer (DET) of enzymes with unprecedented applicability and versatility. The biologically assembled conductive nanomesh enzyme platform enables DET-based flexible(More)
Single-walled carbon nanotubes (SWNTs) are one of the promising electronic components for nanoscale electronic devices such as field-effect transistors (FETs) owing to their excellent device characteristics such as high conductivity, high carrier mobility and mechanical flexibility. Localized gating gemometry of FETs enables individual addressing of active(More)
Delicately assembled composites of semiconducting nanomaterials and biological materials provide an attractive interface for emerging applications, such as chemical/biological sensors, wearable health monitoring devices, and therapeutic agent releasing devices. The nanostructure of composites as a channel and a sensing material plays a critical role in the(More)
The spin injection and transport properties of the Permalloy/Si/Permalloy (Py) hybrid device fabricated on 50 nm thick silicon film on insulator (SOI) wafer were investigated in this study. Spin valve effect was found in the field range of 100/spl sim/200 Oe over which magnetization of two Py is aligned antiparallel showing maximum resistance. The result(More)
The demonstration of field-effect transistors (FETs) based entirely on single-walled carbon nanotubes (SWNTs) would enable the fabrication of high-on-current, flexible, transparent and stretchable devices owing to the excellent electrical, optical, and mechanical properties of SWNTs. Fabricating all-SWNT-based FETs via simple solution process, at room(More)
This paper presents a design of an embedded system for a portable and cost effective bio-sensing. With our system, users can easily and cost-efficiently generate the necessary control signals such as cyclic waves for bio-sensors with precisely controlled timing. The bio-sensing system consists of an analog-to-digital converter (ADC) used for data(More)
The magnetization reversal of a lateral submicrometer-sized magnetic layer by a spin-polarized current has been known recently. In this work, the current induced magnetization switching effect at RT in an exchange biased spin valve with nano oxide layer structure is reported for the first time. A great enhancement of the effect has been observed. The(More)