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We demonstrate controlled number and placement of the Ge quantum dot (QD) along with tunnel junction engineering through a self-organized approach for effective management of single electron tunneling. In this approach, a single Ge QD (∼11 nm) self-aligning with nickel-silicide electrodes is realized by thermally oxidizing a SiGe nanorod bridging a 15-nm-wide nanotrench in close proximity to electrodes...
In this paper, we demonstrated the method to control the concentration after liquid-liquid extraction by generating an encapsulated droplet with precisely controlled water to oil volume ratio by merging individually created aqueous and organic droplets through EWOD (electrowetting-on-dielectric) actuation. In addition, the core and shell droplets were separated after the extraction process by applying...
A novel high-performance metal-insulator-metal (MIM) capacitor for analog and radio-frequency (RF) applications has been developed using SrTiO3/Al2O3/SrTiO3 laminate as the dielectric. A very high capacitance density of 19.13 fF/μm2 has been achieved due to the perovskite SrTiO3 (STO) with a very high dielectric constant of 145. This MIM capacitor also displays a quadratic voltage coefficient of 610...
We have developed a simple, manageable, and self-organized manner - thermally oxidizing SiGe nanocavity for precisely controlling Ge quantum dot (QD) number, position, and tunnel path, which is crucial for effective single-electron tunneling devices. The internal structure properties of Ge QDs were systematically characterized. The effectiveness of Ge QD placement is evidenced by high performance...
Precise control on quantum dot (QD) number and tunnel path in a self-organized manner is crucial for effective single electron tunneling. We experimentally demonstrated a single Ge QD (~10 nm) self-aligned with nickel-silicide electrodes via Si3N4/SiO2 tunnel barriers by thermally oxidizing a SiGe nanorod. The fabricated Ge QD single hole transistor (SHT) features with clear differential conductance...
This paper reports an improved method for reducing the impedance of microelectrode array (MEA). The impedance reduction is generally required by increasing the effective surface area of electrode. We have fabricated and treated the multi-walled carbon nanotubes (MWCNTs) based MEA for neuroscience application. The effect of plasma treatment on the surface wettability of MWCNTs was examined and characterized...
In this paper, we demonstrate the method to generate an encapsulated droplet with precisely controlled water to oil volume ratio by merging individually created water and oil droplets through EWOD (electrowetting-on-dielectric) and DEP (dielectrophoresis) actuations, respectively. In addition, the 10cSt oil shell can be removed by mixing it with a volatile solvent. A bare droplet is obtained after...
By applying electrical pulse wave into highly-ionized solution, we observed that protein can be efficiently transported toward the electrode surface regardless the protein is positive or negative charged. The operational frequency and electrical potential of the driving electrical pulse waves are not in the range of typical electrokinetic. Here we hypothesized a fluidic movement normal to the electrode...
Dielectrophoresis (DEP) is an effective microelectronic technique for trapping and manipulating biological particles in a microfluidic environment, which relies on the highly asymmetric electric field gradient created by the microelectrodes. Here we demonstrate an AC DEP technique for single-bacteria trapping using nanoelectrode arrays (NEAs) in a "points-and-lid" configuration. The NEA...
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