Review
Chemistry, Physical
Chenxiao Wang, Yifeng Shi, Dong Qin, Younan Xia
Summary: With the mastery over colloidal synthesis of monometallic nanocrystals, the combination of two different metals with intricate architectures has emerged as a new direction of innovation. The core-shell structure has attracted significant scientific interest due to its high controllability and variability. However, the addition of a shell composed of a different metal brings unexpected complications for surface composition, hindering both structural understanding and application performance. This article provides an overview of the opportunities and technical challenges associated with bimetallic core-shell nanocrystals and highlights promising solutions for future research advances.
NANOSCALE HORIZONS
(2023)
Article
Chemistry, Physical
Jessi E. S. van der Hoeven, Jelena Jelic, Liselotte A. Olthof, Giorgio Totarella, Relinde J. A. van Dijk-Moes, Jean-Marc Krafft, Catherine Louis, Felix Studt, Alfons van Blaaderen, Petra E. de Jongh
Summary: The study investigates the performance of an Au-Pd core-shell catalyst in the selective hydrogenation of butadiene, showing shell-thickness-dependent catalytic activity, high selectivity, and activity up to 50 times greater than that of alloyed counterparts.
Article
Nanoscience & Nanotechnology
Yaru Zhang, Zhaocong Zheng, Zhankun Chen, Xiaozhao Wang, Wei Chen, Zhimin Gao, Jiamin Luo, Chen Lin, Wenyu Xie, Yuchi Wan, Meiling Tan, Donglian Liu, Zhiyao Hou
Summary: Researchers have successfully achieved reactive oxygen species (ROS) augmentation in mild photothermal therapy (mPTT) by fabricating Au@Pd bimetallic nanozyme. This nanozyme exhibits multienzymatic activities for photothermal conversion and induces ROS generation, which helps to suppress the heat-defense response of tumor cells and improves therapeutic efficacy.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Multidisciplinary
Namsoon Eom, Maria E. Messing, Jonas Johansson, Knut Deppert
Summary: The study examines the core-shell preference of bimetallic nanoparticles and the impact of surface segregation phenomena. It reveals that cohesive energy and Wigner-Seitz radius are the primary factors influencing the core-shell preference and level of segregation in these nanoparticles.
Article
Chemistry, Multidisciplinary
Jessi E. S. van der Hoeven, Tian-Song Deng, Wiebke Albrecht, Liselotte A. Olthof, Marijn A. van Huis, Petra E. de Jongh, Alfons van Blaaderen
Summary: By performing metal overgrowth on gold nanorods within a mesoporous silica shell, researchers were able to achieve full control over the shape, shell thickness, and morphology of the resulting bimetallic core-shell nanorods, leading to precisely tunable plasmonic properties for applications such as surface-enhanced Raman spectroscopy.
Article
Chemistry, Applied
Fei Ge, Haihong Xia, Jing Li, Xiaohui Yang, Minghao Zhou, Jianchun Jiang
Summary: In this work, core-shell Cox@C@Ni catalysts were prepared and applied to catalyze the conversion of guaiacol to cyclohexanol. The catalysts showed better performance compared to Co@C catalyst. The optimal condition achieved nearly 100% conversion of guaiacol and 90% selectivity of cyclohexanol at 220 degrees C for 2 hours using isopropanol as the hydrogen donor solvent. The structure, composition, and acidity of the catalysts played a significant role in the hydrodeoxygenation reaction, and the reaction mechanism was deduced based on product distributions and physicochemical properties.
FUEL PROCESSING TECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Serkan Koylan, Sensu Tunca, Gokhan Polat, Mete Batuhan Durukan, Dongkwan Kim, Yunus Eren Kalay, Seung Hwan Ko, Husnu Emrah Unalan
Summary: A solution-based strategy was developed to deposit a thin platinum (Pt) shell layer onto silver nanowires (Ag NWs) to improve their chemical, environmental, and electrochemical stabilities. The core-shell NW networks showed superior stability under different conditions compared to bare Ag NWs, with a broadened potential window for electrochemical stability. Additionally, Ag-Pt core-shell NWs exhibited high sensitivity in hydrogen peroxide detection with a low detection limit.
Article
Multidisciplinary Sciences
Xiaohui Zhang, Zhihu Sun, Rui Jin, Chuwei Zhu, Chuanlin Zhao, Yue Lin, Qiaoqiao Guan, Lina Cao, Hengwei Wang, Shang Li, Hancheng Yu, Xinyu Liu, Leilei Wang, Shiqiang Wei, Wei-Xue Li, Junling Lu
Summary: Core-shell bimetallic nanocatalysts have been widely studied in heterogeneous catalysis. In this study, Au@Pd core-shell catalysts were investigated and it was found that a large Au core with a thin Pd shell is crucial for achieving optimum benzyl alcohol adsorption and high catalytic activity. A series of Au@Pd/SiO2 catalysts with different core sizes and shell thicknesses were fabricated, and it was observed that the activity increased with core size but varied nonmonotonically with shell thickness. The findings reveal the importance of conjugated dual particle size effect in bimetallic catalysis.
NATURE COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Nobutomo Nakamura, Koji Matsuura, Akio Ishii, Hirotsugu Ogi
Summary: The formation process of core-shell bimetallic nanoparticles synthesized by sputtering onto a substrate was observed in real time using an acoustic technique. The experiments revealed that restructuring occurred in the Pd-Au alloy system, resulting in the formation of A-shell/B-core nanoparticles, while other systems tended to form B-shell/A-core nanoparticles.
Article
Chemistry, Analytical
Francesco Ruffino
Summary: Bimetallic nanoparticles exhibit unique properties for various technological applications, particularly in terms of optical properties and their interaction with electromagnetic radiation. The core-shell structure significantly affects the optical properties of these nanoparticles.
Article
Chemistry, Physical
Konrad Wojtaszek, Filip Cebula, Bogdan Rutkowski, Magdalena Wytrwal, Edit Csapo, Marek Wojnicki
Summary: This study synthesized core-shell nanoparticles with a Ni core and a Ag-Ni nano alloy shell by reducing Ni and Ag ions with sodium borohydride in the presence of trisodium citrate as a stabilizer. XRD and XPS spectroscopic studies were conducted to determine the phase composition and oxidation states of the nanoparticles, respectively. The composition and shape of the particles were determined using HR-TEM EDS testing. The obtained nanoparticles had a size of 11 nm. Catalytic activity research was carried out using a methylene blue reduction system, and the catalytic activity of the colloids was measured using UV-Vis spectrophotometry. The Ag-Ni alloy exhibited approximately ten times higher catalytic activity than pure silver nanoparticles of a similar size.
Article
Chemistry, Multidisciplinary
Burak Yapici, Ozlem Gokdogan Sahin
Summary: M@Pd/CNT (M: Zn, Mn, Ag, Co, V, Ni) core-shell and Pd/CNT nanoparticles were prepared by sodium borohydride reduction and investigated as cathode catalysts for hydrogen peroxide reduction. The results showed that the Zn@Pd/CNT-modified electrode exhibited the highest current density and the lowest charge transfer resistance among the synthesized electrocatalysts.
Article
Chemistry, Multidisciplinary
Mingzhen Hu, Zengjian Cai, Shitu Yang, Zhe Wang, Fengyi Shen, Xinhu Liang, Guodong Sun, Hao Ren, Yanan Cao, Botao Hu, Shoujie Liu, Haiyan Tan, Kebin Zhou
Summary: Due to the surface inhomogeneity, it is challenging to directly grow uniform bimetallic nanoparticles (NPs) on solid supports with controllable structure and size. In this study, a surface-confinement strategy was utilized to prepare ultrafine bimetallic Pt-M NPs (M(sic)Fe, Cu, and Co) with core-shell or intermetallic compounds structure on an N functionalized carbon support (NC). The N species on NC support can disperse metal cations, facilitating uniform nucleation and growth of bimetallic NPs. Moreover, N-mediation confines metal transfer to a narrow region on NC, resulting in localized particle growth and formation of ultrafine bimetallic NPs. The Pt3Fe NPs on NC exhibited excellent catalytic activity and durability for electrochemical hydrogen evolution reaction.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Paul Boone, Yiwen He, Austin R. Lieber, Janice A. Steckel, Nathaniel L. Rosi, Katherine M. Hornbostel, Christopher E. Wilmer
Summary: In this study, a novel core-shell MOF design strategy is proposed to address the issue of competitive binding between water and CO2 in traditional adsorbents. Through a combination of experimental measurements, computational modeling, and multiphysics modeling, 10 core-shell MOF candidates with superior performance were identified.
Article
Chemistry, Applied
Alexandru-Milentie Hada, Monica Potara, Simion Astilean, Annalaura Cordaro, Giulia Neri, Milo Malanga, Antonia Nostro, Antonino Mazzaglia, Angela Scala, Anna Piperno
Summary: In this study, we propose a mild, ecofriendly, and straightforward synthesis method for producing core-shell Au@Ag bimetallic nanoparticles for antibacterial nanomedicine and SERS imaging. The synthesis utilizes a cationic polymeric cyclodextrin as a reducing and stabilizing agent to obtain monodispersed and stable nanoparticles. The resulting nanoparticles show good antibacterial activity and can be used for various applications.
CARBOHYDRATE POLYMERS
(2022)
Article
Nanoscience & Nanotechnology
Geun-Ho Han, Xiangyun Xiao, Jaeyoung Hong, Kyu-Joon Lee, Soohyung Park, Jae-Pyoung Ahn, Kwan-Young Lee, Taekyung Yu
ACS APPLIED MATERIALS & INTERFACES
(2020)
Article
Chemistry, Physical
Yu-Jin Kim, Jaeyoung Lee, Gwang-Bum Im, Jihun Song, Jiwoo Song, Jiyong Chung, Taekyung Yu, Suk Ho Bhang
Summary: In this study, a dual therapeutic metal ion-releasing nanoparticle was developed to enhance osteogenic differentiation of stem cells and induce angiogenesis. Zinc and iron were synthesized together into a nanoparticle with a pH-sensitive degradation property to promote osteogenic gene expression and angiogenic factor secretion for human mesenchymal stem cells.
Article
Chemistry, Physical
Bo-In Park, Miri Shin, Jaeho Park, Jae-Seung Lee, Seung Yong Lee, Seunggun Yu
Summary: In this study, high crystallinity Bi0.5Sb1.5Te3.0 (BST) nanoparticles (NPs) were successfully synthesized via a mechanochemical process, and their sizes were further reduced and uniformly distributed through a wet-milling process. The BST nanocomposites fabricated from BST NPs with smaller grain sizes and finer distributions exhibited significantly reduced thermal conductivities. Wet-milled BST NPs showed ultralow thermal conductivity values at approximately 398 K, demonstrating their potential for thermoelectric applications.
Article
Chemistry, Physical
Yu-Jin Kim, Tae-Jin Lee, Gun-Jae Jeong, Jihun Song, Taekyung Yu, Doo Sung Lee, Suk Ho Bhang
Summary: The study developed a simple and easy cell detachment method by modifying the surface with the pH-responsive degradation property of poly (amino ester), allowing for perfect detachment of stem cells in a short period of time. This nonenzymatic approach showed similar cellular properties to conventional enzymatic cell detachment, and demonstrated potential therapeutic applications in in vivo experiments.
Article
Chemistry, Physical
Hyein Lee, Sung-Soo Kim, Suk Ho Bhang, Taekyung Yu
Summary: This study presents a simple method to synthesize stabilizer-free bismuth oxychloride nanoparticles, which exhibit higher photocatalytic activity for the degradation of methylene blue compared to stabilized nanoplates.
Article
Chemistry, Physical
Xiangyun Xiao, Euiyoung Jung, Sehyun Yu, Hyeonjin Kim, Hong-Kyu Kim, Kwan-Young Lee, Jae-Pyoung Ahn, Taeho Lim, Jinheung Kim, Taekyung Yu
Summary: Multi-metallic Pd@FePt core-shell nanoparticles were synthesized using a direct seed-mediated growth method, with the Fe/Pt ratio easily controlled by adjusting precursor amounts. These nanoparticles exhibited excellent activity and stability in the methanol oxidation reaction, making them efficient for use in direct methanol fuel cells compared to commercial Pt/C catalysts.
Review
Chemistry, Physical
Geun-Ho Han, Seok-Ho Lee, Seong-Yeon Hwang, Kwan-Young Lee
Summary: Hydrogen peroxide is a simple oxidizing agent with growing use due to its environmental friendliness. The traditional method of manufacturing H2O2 through anthraquinone autoxidation (AO process) releases large amounts of organic solvents and requires significant energy. Direct synthesis of hydrogen peroxide (DSHP) offers a more sustainable solution, but faces challenges such as mass-transfer limitations and side reactions, requiring advanced technologies for catalyst development.
ADVANCED ENERGY MATERIALS
(2021)
Article
Nanoscience & Nanotechnology
Jongtae Ahn, Ji-Hoon Kyhm, Hee Kyoung Kang, Namhee Kwon, Hong-Kyu Kim, Soohyung Park, Do Kyung Hwang
Summary: In this study, a MoTe2/ReS2 heterostructure was proposed for a high performance photodiode with linearly polarized photodetection function. The optical properties and energy band diagram of this heterostructure were investigated through spectroscopy measurements, showing a rectification ratio of 10(4), a broad spectral response up to 1310 nm, a responsivity of 0.54 A/W, and rapid photoswitching with a cutoff frequency exceeding 100 kHz. Additionally, the photodiode demonstrated linear polarization dependent characteristics due to the asymmetric crystal structure of ReS2.
Article
Chemistry, Physical
Byung Chul Yeo, Hyunji Nam, Hyobin Nam, Min-Cheol Kim, Hong Woo Lee, Sung-Chul Kim, Sung Ok Won, Donghun Kim, Kwan-Young Lee, Seung Yong Lee, Sang Soo Han
Summary: The study introduces a high-throughput screening protocol for discovering alternative catalysts to palladium, identifying a previously unreported bimetallic catalyst with enhanced performance and productivity.
NPJ COMPUTATIONAL MATERIALS
(2021)
Article
Chemistry, Physical
Hong Woo Lee, Euiyoung Jung, Geun-Ho Han, Min-Cheol Kim, Donghun Kim, Kwan-Young Lee, Sang Soo Han, Taekyung Yu
Summary: The researchers synthesized nonconcentric Pd-Au nanoparticles and found that they exhibited high activity and selectivity in direct H2O2 synthesis. By using a 3-in-1 strategy and optimizing performance by controlling the number of Pd/Au interfaces, the potential of the novel alloy catalyst was demonstrated.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Chemistry, Physical
Hyun-Jeong Lee, Hae-Ryoung Kim, Kyu-Jun Lee, Yebin Lee, Hong-Kyu Kim, Woo-Young Yoon, Jae-Pyoung Ahn
Summary: In an all-solid-state battery, microcracks can be repaired by applying stack pressure, which restores the conduction pathways between the graphite and solid-state electrolyte. This crack healing process involves the formation of a solid electrolyte interface (SEI) and an amorphous SEI layer at the binder layer.
ACS APPLIED ENERGY MATERIALS
(2022)
Article
Chemistry, Physical
Hyun-Jeong Lee, Jong-Seok Moon, Young-Woon Byeon, Woo Young Yoon, Hong-Kyu Kim, Jae-Pyoung Ahn
Summary: In this study, the lithiation kinetics of a Si-C composite anode for high-capacity lithium-ion batteries were investigated. It was found that lithium migrates sequentially into carbon, nanopores, and silicon in the composite anode, with the nanopores acting as a lithium reservoir during the pore-filling process.
ACS ENERGY LETTERS
(2022)
Article
Energy & Fuels
Hyun Min Lee, Byung Jin Lee, Sang Yun Kim, Do Heui Kim, Geun-Ho Han, Kwan-Young Lee
Summary: An alternative feedstock is urgently needed for the production of valuable aromatic compounds. This study investigated the codehydroaromatization of natural gas over Ga/HZSM-5 catalysts at a relatively low temperature. The study found that Ga loading of 3 wt% resulted in the highest aromatic formation. Selective formation of GaO+ (Ga3+) was identified as crucial for obtaining more aromatics from the natural gas feed.