Sungjin Cho  Youson Kim  Youngjin Song  Jin Ryu  Keonwoo Choi  Junyeong Yang  Se-Hee Lee  Sung Gap Im  Soojin Park 《Advanced functional materials》2024,34(32):2314710

Sulfide solid electrolytes (SSEs) have garnered significant attention for their high ionic conductivity in the development of all-solid-state batteries (ASSBs). However, SSEs face challenges due to poor chemical and electrochemical stability, leading to SE decomposition at the anode, which in turn increases internal resistance and reduces cycle performance. Herein, to address this issue, thin polymer layers are applied to prevent direct contact between the SSE and anode using the initiated chemical vapor deposition process. This method facilitates the uniform coating of eight types of polymers with polar functionalities on indium (In) anodes. Half-cell tests and X-ray photoelectron spectroscopy analysis reveals that poly(acrylic acid) and poly((perfluorohexyl)ethyl acrylate), containing ─COOH and C─F bonds respectively, effectively stabilized the In/SSE interface. In full cells assembled with polymer-coated In and LiNi_0.8Co_0.1Mn_0.1O₂ (NCM811), capacity retention show remarkable improvement, achieving 64.8% for In@pAA and 50.7% for In@pC6FA after 100 cycles, compared to 29.0% for bare In. This study provides insights into the interaction between polar bonds in polymers and SSEs, potentially bridging a significant knowledge gap resulting from the significant lack of research investigating the relationship between polymers, one of the primary materials commonly used in ASSBs.  相似文献   

    

Seong Rae Cho  Seonghun Ahn  Seung Hyung Lee  Heonhak Ha  Tae Soo Kim  Min-kyung Jo  Chanwoo Song  Tae Hong Im  Pragya Rani  Minseung Gyeon  Kiwon Cho  Seungwoo Song  Min Seok Jang  Yong-Hoon Cho  Keon Jae Lee  Kibum Kang 《Advanced functional materials》2021,31(47):2105302

Advanced patterning techniques are essential to pursue applications of 2D van der Waals (vdW) materials in electrical and optical devices. Here, the direct optical lithography (DOL) of vdW materials by single-pulse irradiation of high-power light through a photomask is reported. The DOL exhibits large-scale patterning with a sub-micrometer resolution and clean surface, which can be applied to various combinations of vdW materials and substrates. In addition, the thermal profile during DOL is investigated using the finite element method, and the ideal conditions of DOL according to the materials and substrates are determined.  相似文献   

    

Healin Im  Sunkook Kim 《Advanced Electronic Materials》2021,7(5):2100003

Broadband photodetectors sensitive to light from visible to near-infrared are essential for various applications such as thermal evaluation, bio-imaging mapping, and bio-health monitoring. Multilayer WSe₂ offers broad light spectral responses and roles in broadband phototransistors’ active matrix. However, it shows relatively lower photoresponsivity than monolayer WSe₂ due to layer-dependent energy band variations. Pentacene islands, a p-type organic material, are formed on the multilayer WSe₂ to enhance its photoresponsivity under broadband lights. Pentacene islands can prominently absorb ultra-violet to visible lights and generate enormous excitons. Besides, they have relatively long exciton diffusion lengths in micrometer scales to effectively enable exciton migration and charge transfer at the pentacene and WSe₂ interface. Consequently, the photocurrent (I_ph) and the photoresponsivity (R_ph) in WSe₂/pentacene transistors are 1.41 µA and 19.313 A W⁻¹ for 638-nm light and 0.20 µA and 1.16 A W⁻¹ for 852-nm light. Therefore, WSe₂/pentacene-based phototransistors can be applied for broadband photodetectors under visible to near-infrared.  相似文献   

    

Healin Im  Arindam Bala  Byungjun So  Young Jun Kim  Sunkook Kim 《Advanced Electronic Materials》2021,7(11):2100644

The thiol-based functionalization of multilayer MoS₂ is performed to customize its electrical and optical performance. Two types of thiol-terminated organic molecules are utilized: 4-amino thiophenol (4ATP) for electron-donating and 4-nitro thiophenol (4NTP) for electron-withdrawing. The thiol groups in these molecules chemically bond with MoS₂ at the sulfur vacancies through the simple solution process. 4ATP-functionalized MoS₂ (4ATP–MoS₂) transistors exhibit a huge enhancement in the current and the carrier concentration, whereas 4NTP-functionalized MoS₂ (4NTP–MoS₂) transistors show the reduction in the film conductance. Moreover, functionalization with 4ATP and 4NTP complementarily modulate the photoresponsive characteristics of MoS₂ transistors. Under 405 nm laser illumination, 4ATP–MoS₂ phototransistors exhibit the enhanced photoresponsivity of 669.10 A W⁻¹ attributed to the large dark currents. In contrast, 4NTP–MoS₂ phototransistors can achieve faster photoswitching performances than 4ATP–MoS₂. Therefore, the thiol-based functionalization can effectively customize the electrical and optical characteristics of multilayer MoS₂.  相似文献   

    

Sang Won Im  Hyo-Yong Ahn  Ryeong Myeong Kim  Nam Heon Cho  Hyeohn Kim  Yae-Chan Lim  Hye-Eun Lee  Ki Tae Nam 《Advanced materials (Deerfield Beach, Fla.)》2020,32(41):1905758

Chirality is a basic property of nature and has great importance in photonics, biochemistry, medicine, and catalysis. This importance has led to the emergence of the chiral inorganic nanostructure field in the last two decades, providing opportunities to control the chirality of light and biochemical reactions. While the facile production of 3D nanostructures has remained a major challenge, recent advances in nanocrystal synthesis have provided a new pathway for efficient control of chirality at the nanoscale by transferring molecular chirality to the geometry of nanocrystals. Interestingly, this discovery stems from a purely crystallographic outcome: chirality can be generated on high-Miller-index surfaces, even for highly symmetric metal crystals. This is the starting point herein, with an overview of the scientific history and a summary of the crystallographic definition. With the advance of nanomaterial synthesis technology, high-Miller-index planes can be selectively exposed on metallic nanoparticles. The enantioselective interaction of chiral molecules and high-Miller-index facets can break the mirror symmetry of the metal nanocrystals. Herein, the fundamental principle of chirality evolution is emphasized and it is shown how chiral surfaces can be directly correlated with chiral morphologies, thus serving as a guide for researchers in chiral catalysts, chiral plasmonics, chiral metamaterials, and photonic devices.  相似文献   

    

Jieung Baek  Younghak Cho  Hyun-Ji Park  Goro Choi  Jong Seung Lee  Minseok Lee  Seung Jung Yu  Seung-Woo Cho  Eunjung Lee  Sung Gap Im 《Advanced materials (Deerfield Beach, Fla.)》2020,32(16):1907225

Cell sheet engineering, a technique utilizing a monolayer cell sheet, has recently emerged as a promising technology for scaffold-free tissue engineering. In contrast to conventional tissue-engineering approaches, the cell sheet technology allows cell harvest as a continuous cell sheet with intact extracellular matrix proteins and cell–cell junction, which facilitates cell transplantation without any other artificial biomaterials. A facile, non-thermoresponsive method is demonstrated for a rapid but highly reliable platform for cell-sheet engineering. The developed method exploits the precise modulation of cell–substrate interactions by controlling the surface energy of the substrate via a series of functional polymer coatings to enable prompt cell sheet harvesting within 100 s. The engineered surface can trigger an intrinsic cellular response upon the depletion of divalent cations, leading to spontaneous cell sheet detachment under physiological conditions (pH 7.4 and 37 °C) in a non-thermoresponsive manner. Additionally, the therapeutic potential of the cell sheet is successfully demonstrated by the transplantation of multilayered cell sheets into mouse models of diabetic wounds and ischemia. These findings highlight the ability of the developed surface for non-thermoresponsive cell sheet engineering to serve as a robust platform for regenerative medicine and provide significant breakthroughs in cell sheet technology.  相似文献   

    

Kyung Mun Yeom  So Un Kim  Mun Young Woo  Jun Hong Noh  Sang Hyuk Im 《Advanced materials (Deerfield Beach, Fla.)》2020,32(51):2002228

Metal halide perovskite (MHP)-based tandem solar cells are a promising candidate for use in cost-effective and high-performance solar cells that can compete with fossil fuels. To understand the research trends for MHP-based tandem solar cells, a general introduction to single-junction and multiple-junction MHP solar cells and the configuration of tandem devices is provided, along with an overview of the recent progress regarding various MHP-based tandem cells, including MHP/crystalline silicon, MHP/CuInGaS, MHP/organic photovoltaic, MHP/quantum dot, and all-perovskite tandem cell. Future research directions for MHP-based tandem solar cells are also discussed.  相似文献   

    

Akbar I. Inamdar  Harish S. Chavan  Sambhaji M. Pawar  Hyungsang Kim  Hyunsik Im 《国际能源研究杂志》2020,44(3):1789-1797

It has become essential to develop efficient, economical, and earth-abundant catalysts for clean, environmentally friendly, and sustainable fuel production. Herein we describe the fabrication of a ternary NiFeCo oxide catalyst with a RF-magnetron sputtering technique and investigated as durable catalyst oxygen evolution reaction (OER). A comparative study of the electrocatalytic activities of pure, bimetallic, and trimetallic catalysts is performed. With the synergetic effects of electronic structural modification and the large electrochemical area of the ternary NiFeCo oxide catalyst, current densities of 1 and 10 mA cm⁻² are attained at small overpotentials of 248 and 280 mV, respectively. The relatively low Tafel slope of the trimetallic electrode (32.25 mV dec⁻¹) indicates favorable catalytic kinetics during OER. This is attributed to the catalytic performance of metal constituents with high oxidation states. The electrode exhibits outstanding durability during rigorous oxygen evolution testing in 1 M KOH for 500 hours. Simple sputtering deposition of multimetallic oxide catalyst films can be applied to fabricate other multimetallic catalysts and electrodes for robust, efficient water spitting, and electrochemical energy storage.  相似文献   

    

Syed Azkar Ul Hasan  David S. Lee  Sang Hyuk Im  Ki-Ha Hong 《Solar RRL》2020,4(2)

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Akbar I. Inamdar  Harish S. Chavan  Bo Hou  Chi Ho Lee  Sang Uck Lee  SeungNam Cha  Hyungsang Kim  Hyunsik Im 《Small (Weinheim an der Bergstrasse, Germany)》2020,16(2)

To generate hydrogen, which is a clean energy carrier, a combination of electrolysis and renewable energy sources is desirable. In particular, for both the oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) in electrolysis, it is necessary to develop nonprecious, efficient, and durable catalysts. A robust nonprecious copper–iron (CuFe) bimetallic composite is reported that can be used as a highly efficient bifunctional catalyst for overall water splitting in an alkaline medium. The catalyst exhibits outstanding OER and HER activity, and very low OER and HER overpotentials (218 and 158 mV, respectively) are necessary to attain a current density of 10 mA cm^?2. When used in a two‐electrode water electrolyzer system for overall water splitting, it not only achieves high durability (even at a very high current density of 100 mA cm^?2) but also reduces the potential required to split water into oxygen and hydrogen at 10 mA cm^?2 to 1.64 V for 100 h of continuous operation.  相似文献