Youngwook Park

Atomic-scale control of photochemistry facilitates extreme miniaturisation of optoelectronic devices. Localised surface plasmons, which provide strong confinement and enhancement of electromagnetic fields at the nanoscale, secure a route to achieve sub-nanoscale reaction control. Such local plasmon-induced photochemistry has been realised only in metallic structures so far. Here we demonstrate controlled plasmon-induced single-molecule switching of peryleneanhydride on a silicon surface. Using a

Abstract Brute force orientation by an electric field is a promising way of controlling the orientation of polar molecules in the gas phase, but its application to condensed‐phase molecules has been very limited. We studied the reorientation of formaldehyde molecules in a solid Ar matrix under the influence of a strong electric field using reflection absorption infrared spectroscopy. Asymptotically perfect alignment of the formaldehyde molecules along the field was achieved at field strengths ex

The purpose of this study is to reveal the paths of how absorptive capacity and government support combine for SMEs to create innovation performance based on external information resources. In addition, this study investigates the configurational paths for SMEs’ innovation creation depending on their industrial environment by comparing analyses of industry types. This study used data from 1,421 Korean SMEs in the manufacturing sector based on the 2018 Korea Innovation Survey data and conducted a

Significance Our experiment captures the detailed sequence of molecular processes that occur when a uniquely strong (∼10 8 V/m) direct current (DC) electric field is imposed on ammonia molecules isolated in a solid Ar matrix. Electric fields are of singular importance in chemistry, materials science, and molecular biology. Intermolecular interactions, resulting in rearrangements of electrons and nuclei, are driven by strong electric fields. The detailed responses of molecules to external electri

The susceptibility of a water molecule to electric fields provides fundamental and essential information for understanding the vibrational spectra of water clusters and condensed-phase water. In this study, the Stark sensitivities for the ν2 bending and ν1 symmetric stretching vibrations of water molecule were experimentally determined. The water molecules isolated in the solid Ar matrix were spatially oriented in the direction of the externally applied field (∼108 V m–1) in the laboratory frame

We investigated the impact of the designed contact area (DCA) and designed contact length (DCL) on material removal rates (MRR) when using a pad with a structured surface in chemical mechanical polishing. The structure of the structured surface pad (SSP) was precisely defined, and an examination was conducted to assess the influence of variations in the shape, size, and spacing of the unit figure (UF) on the MRR. The results revealed that maintaining the DCA constant while altering the UF shape

The structure and reactivity of a molecule in the condensed phase are governed by its intermolecular interactions with the surrounding environment. The multipole expansion of each molecule in the condensed phase indicates that the intermolecular interactions are essentially electrostatic (e.g., ion-dipole, dipole-dipole, dipole-quadrupole, dipole-induced dipole). The electrostatic field is a fundamental language of intermolecular communications. Therefore, understanding the influence of the elec

Chemical reactions are extremely difficult to occur in ice at low temperature, where atoms and molecules are frozen in position with minimal thermal energy and entropy. Contrary to this general behavior, certain weak acids including fluoroacetic acids dissociate spontaneously and more efficiently in cryogenic ice than in aqueous solution at room temperaure. The enhanced reactivity of weak acids is an unexpected consequence of proton-transfer equilibrium in ice. The configurational entropy of pro

This article focuses on the manipulation of molecular bond lengths by an external electric field. A uniform dc electric field with strength up to 1.5 × 10 8 V/m was applied to HCl–H 2 O and HCl–D 2 O complexes isolated in solid Ar matrices by using the ice film nanocapacitor method. The field-dependent vibrational spectra of the samples showed an extraordinarily large Stark shift of the proton vibration (H–Cl stretch) frequency of the HCl–water complexes in the electric field compared to that of

Abstract Brute force orientation by an electric field is a promising way of controlling the orientation of polar molecules in the gas phase, but its application to condensed‐phase molecules has been very limited. We studied the reorientation of formaldehyde molecules in a solid Ar matrix under the influence of a strong electric field using reflection absorption infrared spectroscopy. Asymptotically perfect alignment of the formaldehyde molecules along the field was achieved at field strengths ex