Publications by authors named "Sihoon Son"

Owing to the exotic state of quantum matter, topological insulators have emerged as a significant platform for new-generation functional devices. Among these topological insulators, tetradymites have received significant attention because of their van der Waals (vdW) structures and inversion symmetries. Although this inversion symmetry completely blocks exotic quantum phenomena, it should be broken down to facilitate versatile topological functionalities.

View Article and Find Full Text PDF

Transition metal dichalcogenides (TMDs) have received considerable attention as promising electrocatalysts for the hydrogen evolution reaction (HER), yet their potential is often constrained by the inertness of the basal planes arising from their poor hydrogen adsorption ability. Here, the relationship between the electronic structure of the WS basal plane and HER activity is systemically analyzed to establish a clear insight. The valance state of the sulfur atoms on the basal plane has been tuned to enhance hydrogen adsorption through sequential engineering processes, including direct phase transition and heterostructure that induces work function-difference-induced unidirectional electron transfer.

View Article and Find Full Text PDF
Article Synopsis
  • Two-dimensional ferroelectric materials, like CuInPS, are promising for advanced 3D electronic devices, particularly in neuromorphic computing, due to their unique properties.
  • CuInPS behaves as a ferroelectric insulator at room temperature and requires external conditions to activate its ionic conduction, which can lead to randomness in performance.
  • Researchers developed a method to mechanically manipulate free-standing 2D ferroelectric structures to enhance controlled ion transport, resulting in a significant increase in current and potential applications in efficient self-powered systems and reliable neuromorphic devices.
View Article and Find Full Text PDF

Mesoporous metal oxides exhibit excellent physicochemical properties and are widely used in various fields, including energy storage/conversion, catalysis, and sensors. Although several soft-template approaches are reported, high-temperature calcination for both metal oxide formation and template removal is necessary, which limits direct synthesis on a plastic substrate for flexible devices. Here, a universal synthetic approach that combines thermal activation and oxygen plasma to synthesize diverse mesoporous metal oxides (VO, VO, TiO, NbO, WO and MoO) at low temperatures (150-200 °C), which can be applicable to a flexible polymeric substrate is introduced.

View Article and Find Full Text PDF

The bifunctionality of chromism-integrated sensors and devices has been highlighted because of their reversibility, fast response, and visual indication. For example, one of the representative chromism electrochromic materials exhibits optical modulation under ion insertion/extraction by applying a potential. This operation mechanism can be integrated with various sensors (pressure, strain, biomolecules, gas, etc.

View Article and Find Full Text PDF

Objective: The aims of our study are to evaluate the effect of curcumin on spinal cord neural progenitor cell (SC-NPC) proliferation and to clarify the mechanisms of mitogen-activated protein (MAP) kinase signaling pathways in SC-NPCs.

Methods: We established cultures of SC-NPCs, extracted from the spinal cord of Sprague-Dawley rats weighing 250 g to 350 g. We measured proliferation rates of SC-NPCs after curcumin treatment at different dosage.

View Article and Find Full Text PDF

Back pain and radiating pain to the legs are the most common symptoms encountered in routine neurosurgical practice and usually originates from neurogenic causes including spinal stenosis. The clinial symptoms are often confused with symptoms of peripheral neuropathy, musculo-skeletal disease and vascular disease in elderly patients. Because it is not easy to distinguish out the cause of symptoms by only physical examination, routine spinal MRI is checked first to rule out the spinal diseases in most outpatient clinics.

View Article and Find Full Text PDF

A PHP Error was encountered

Severity: Warning

Message: fopen(/var/lib/php/sessions/ci_session7vq1d4dkh3u1o7r1h53ej78jkelr8e7i): Failed to open stream: No space left on device

Filename: drivers/Session_files_driver.php

Line Number: 177

Backtrace:

File: /var/www/html/index.php
Line: 316
Function: require_once

A PHP Error was encountered

Severity: Warning

Message: session_start(): Failed to read session data: user (path: /var/lib/php/sessions)

Filename: Session/Session.php

Line Number: 137

Backtrace:

File: /var/www/html/index.php
Line: 316
Function: require_once