Applied Science and Convergence Technology

Ruthenium tris(bipyridine) [Ru(bpy) 3 ] acts as a photocatalyst under visible-light irradiation.However, it undergoes dimerization and degradation and has a short photocatalytic life.In this study, we encapsulated Ru(bpy) 3 as a guest molecule in a suitable host material, which is a zeolitic imidazolate framework-71 (ZIF-71), using a simple in situ synthesis method.This stabilized its photocatalytic activity.A series of Ru(bpy) 3 @ZIF-71 composites ( = Zn 2+ : Ru ratio = 1, 3, 5, 7, and 10) with different amounts of loaded Ru(bpy) 3 were synthesized and characterized by X-ray diffraction, ultraviolet-visible (UV-vis) spectroscopy, and fluorescence spectroscopy.The crystal structure of ZIF-71 was maintained in the Ru(bpy) 3 @ZIF-71 samples, and their UV-vis absorbance and fluorescence were almost identical to those of pure Ru(bpy) 3 .Moreover, Ru(bpy) 3 @ZIF-71 exhibited a high conversion yield (95 %) for the photocatalytic conversion of -bromoacetophenone to acetophenone and good recycling stability over three cycles.We believe this strategy can be applied to fabricate other similar host-guest photocatalytic systems.

Cao Thanh Tung Pham

Hyun Sung Kim

Ruthenium Tris(bipyridine) Encapsulation in Zeolitic Imidazolate Framework-71 and its Photocatalytic Properties

钌三联吡啶在沸石咪唑骨架-71中的包封及其光催化性能

Energy saving methods/materials are becoming increasingly important for meeting society's energy demands.Smart windows made of thermochromic materials show great promise in reducing the energy consumption of buildings.Thermochromic vanadium dioxide (VO 2 ) is a potential candidate for smart window applications; however, its commercial usage is limited by its low visible light transmittance.To address this issue, we integrated a VO 2 layer with an antireflecting Ti-doped ZnO (TZO) layer.Single-layer VO 2 and bilayer TZO/ VO 2 thin films were fabricated on c-Al 2 O 3 substrates using radio frequency sputtering, and their structural, morphological, and optical properties were investigated.The single-phase growth of the VO 2 and TZO layers in single and bilayer samples was confirmed through room-temperature X-ray diffraction (XRD) measurements.Temperature-dependent grazing incidence XRD measurements during the heating and cooling cycle were performed in a synchrotron to explore the structural changes in the VO 2 and TZO/VO 2 thin-film samples.The structural phase transition curves were modified in the TZO/VO 2 thin-film sample.The increase in visible light transmittance was examined using ultraviolet-visible spectroscopy in the transmittance mode at room temperature.The enhanced visible light transmittance of the TZO/VO 2 bilayer shows promise for realizing more effective smart windows.

Chirag Saharan

Pawan S Rana

Manish Kumar

Optical Properties and Phase Transition in VO2 and Ti:ZnO/VO2 Thin Films

VO2和Ti:ZnO/VO2薄膜的光学性质与相变

This research proposes an innovative method for optimizing plasma etching processes in semiconductor manufacturing using machine learning (ML).Plasma etching is a critical process in defining precise patterns on semiconductor materials, requiring accurate process control.In this study, we employ the ML model based on big data to develop a predictive model that can capture complex relationships between process variables and plasma etching outcomes as the thickness of MoS 2 .The ML model demonstrated high accuracy, closely aligning with actual experimental results.The experiments confirmed uniform etching across the entire 4-inch wafer, with a precision of approximately 1 nm.Based on this research, we aim to apply ML prediction models to various process conditions of plasma etching and gain deeper insight into the ML's capabilities for two-dimensional materials in semiconductor manufacturing.

Changmin Kim

Seunghwan Lee

Muyoung Kim

Min Sup Choi

Taesung Kim

Hyeong-U Kim

Machine Learning-Based Prediction of Atomic Layer Control for MoS2 via Reactive Ion Etcher

基于机器学习的通过反应离子刻蚀实现MoS2原子层控制的预测

The structural and electrical properties of ferroelectrics can be altered through different mechanisms to meet necessary conditions, depending on the additive type in appropriate proportions.This study investigates the growth process of four types of BaTiO 3 (BT), each substituted with 0.1 mol% of trivalent and pentavalent elements: Nb 5+ , Ta 5+ , Bi 3+ , and Sb 3+ .The relationship between the dielectric properties of perovskite formation and grain growth is explored across the four dopants.The results confirm the proficient growth of these four BT compositions when substituted with trivalent and pentavalent ions, yielding relatively high-density particles.Moreover, the fundamental dielectric properties of the ferroelectrics satisfied the required levels.X-ray diffraction studies revealed that both Nb-and Ta-doped BT, prepared by substituting 0.1 mol% of Nb 5+ and Ta 5+ , demonstrated distinctive splitting of the ( 200) and ( 002) peaks within the range of 45.10-45.45∘ .However, no clear evidence was observed for Bi-and Sb-doped BT compositions containing trivalent Bi 3+ and Sb 3+ ions.In particular, the transition temperature of the four substituted BT compositions exhibited negligible divergence from that of pure BT, with a marginal shift toward lower temperatures.In addition, contrary to pure BT, the characteristics of ln(T-Tm) vs. ln[(1/K)-(1/Km)] and 1/K vs. T, which elucidate high-temperature phase transitions, exhibited relatively well-satisfied behavior with the modified Curie-Weiss law.

Yeon Jung Kim

Dielectric Characteristics of BaTiO3 Solid Solution Substituted with Nb5+, Ta5+, Bi3+, and Sb3+ Ions

含Nb5+、Ta5+、Bi3+和Sb3+离子的BaTiO3固溶体的介电特性

The fabrication of perovskite solar cells (PSCs) under ambient conditions is a major challenge for their commercialization.We evaluated the optical and device properties of the perovskite films in an uncontrolled environment through substrate preheating.The preheated substrate rapidly reached the turbid point and reduced the effect of relative humidity.An early antisolvent application time point with a preheated substrate increased the thickness of the perovskite film and improved its optical properties.However, the device characteristics were limited owing to the increased recombination with increasing thickness.Our results can guide the fabrication of high-quality, durable PSCs under various ambient conditions.

Jaewon Oh

Hyunbok Lee

Mee-Yi Ryu

Enhancement of Light-Harvesting Ability on Perovskite Films via Preheated Substrates

通过预热基底增强钙钛矿薄膜的光捕获能力

Jun Yeong Heo

Duy Hoang Nguyen

Dong Gwon Heo

Sung Hun Kim

Hong Seok Lee

Room-Temperature Synthesis and Tuning Optical Properties of CsPbBr3 Nanocrystals via Ligand-Assisted Reprecipitation

室温合成及配体辅助再沉淀法调控CsPbBr3纳米晶的光学性质

Dohyun Kim

Hyun-Wook Jung

Sung-Jae Chang

Il-Gyu Choi

Ho-Kyun Ahn

Hyun Seok Lee

Investigation of In Situ NH3 and N2O Plasma Treatment on AlGaN/GaN High Electron Mobility Transistors

原位NH3和N2O等离子体处理对AlGaN/GaN高电子迁移率晶体管的研究

Kyungmin Lee

Hyo Jung Kim

Precursor Control for Air-Processable Anti-Solvent-Free Perovskite Photovoltaic Cells in High-Humidity Conditio

高湿度条件下无反溶剂可空气处理的钙钛矿光伏电池的前驱体控制

Hyeokjun Kang

Hyun Jun Kang

Hyeyoung Ko

Yong Hee Lee

Sooseok Choi

Study on Nickel-Based Catalysts for Methane Pyrolysis Using Thermal Plasma

热等离子体甲烷热解用镍基催化剂研究

Geon Woong Eom

Sang Ho Lee

In Yong Park

Woo Seok Kang

Min Hur

Dae-Woong Kim

Analysis of Gas Detection Sensitivity of a Self Plasma-Optical Emission Spectrometer Using an N2 and Ar Gas-Mixing Evaluation System

自等离子体-光学发射光谱仪气体检测灵敏度分析：基于N2和Ar混合气体评价系统

短名	Appl. Sci. Converg. Technol.
Journal Impact	1.40
国际分区	PHYSICS, APPLIED(Q4)

出版信息	出版商: Korean Vacuum Society，出版周期: ，期刊类型: journal，开源期刊: 否
基本数据	创刊年份: 2019，原创研究文献占比: ，自引率:， Gold OA占比:

Applied Science and Convergence Technology

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Ruthenium Tris(bipyridine) Encapsulation in Zeolitic Imidazolate Framework-71 and its Photocatalytic Properties

Optical Properties and Phase Transition in VO₂ and Ti:ZnO/VO₂ Thin Films

Machine Learning-Based Prediction of Atomic Layer Control for MoS₂ via Reactive Ion Etcher

Dielectric Characteristics of BaTiO₃ Solid Solution Substituted with Nb⁵⁺, Ta⁵⁺, Bi³⁺, and Sb³⁺ Ions

Enhancement of Light-Harvesting Ability on Perovskite Films via Preheated Substrates

Room-Temperature Synthesis and Tuning Optical Properties of CsPbBr₃ Nanocrystals via Ligand-Assisted Reprecipitation

Investigation of In Situ NH₃ and N₂O Plasma Treatment on AlGaN/GaN High Electron Mobility Transistors

Precursor Control for Air-Processable Anti-Solvent-Free Perovskite Photovoltaic Cells in High-Humidity Conditio

Study on Nickel-Based Catalysts for Methane Pyrolysis Using Thermal Plasma

Analysis of Gas Detection Sensitivity of a Self Plasma-Optical Emission Spectrometer Using an N₂ and Ar Gas-Mixing Evaluation System

ISSN	1225-8822, 2288-6559
h-index	9