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Articles by Wonjoo Na
The improved electrochemical performances of MOF-derived Ni-Co layered double hydroxide complexes using distinctive hollow-in-hollow structures
The improved electrochemical performances of MOF-derived Ni-Co layered double hydroxide complexes using distinctive hollow-in-hollow structures Metal-organic framework (MOF)-derived electroactive materials have drawn great attention due to their diverse design and high electrochemical activity. Herein, a unique hybrid structure consisting of Ni-Co layered double hydroxide (LDH) and hollow carbon sphere (HCS) is first synthesized using HCS@ZIF-67 as a precursor.
Fabrication of Sinter-free Conductive Cu Paste using sub-10 nm Copper Nanoparticles
We herein describe the fabrication of sinter-free copper nanoparticle-based conductive paste (Cu NPs paste). The copper nanoparticles with the size below 10 nm enable the formation of integrated structure even without heat-treatment. Poly(vinylimidazole-co-vinyltrimethoxysilane) used in the synthesis grant the copper surface a high anti-oxidant ability over a temperture range up to 300 °C at ambient condition.
Highly porous carbon nanofibers co-doped with fluorine and nitrogen for outstanding supercapacitor performance
One-dimensional (1D) carbon materials are typically used for electric double layer capacitor (EDLC) electrodes due to their excellent charge carrier mobility. However, improvement of the low capacitance and energy density of these carbon-based EDLCs has been required although they have a fast charge/discharge rate and long cycle life.
Size-controllable ultrathin carboxylated polypyrrole nanotube transducer for extremely sensitive 17β-estradiol FET-type biosensors
17β-Estradiol is known as a steroid hormone in the human body but it is also known as a disruptor that can cause disequilibrium and dysfunction of the human immune system. Recently, there has been much interest in developing biosensors to detect low concentrations of 17β-estradiol. In this work, size-controllable aptamer conjugated ultrathin carboxylated polypyrrole nanotubes (A-UCPPyNTs) were fabricated as transducers in 17β-estradiol field-effect transistor (FET)-type biosensors.
Hierarchical core/shell Janus-type α-Fe2O3/PEDOT nanoparticles for high performance flexible energy storage devices
A new class of hierarchical α-Fe O /poly(3,4-ethylenedioxythiophene) (PEDOT) core/shell Janus-type hybrid nanoparticles (HNPs) was successfully synthesized using sonochemical, liquid–liquid diffusion-assisted crystallization, and vapor deposition polymerization methods. The synthesized α-Fe O /PEDOT HNPs exhibited several unique properties, including a large surface area, high conductivity, excellent electrochemical properties, and high chemical stability.
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