Article
Materials Science, Ceramics
Gustavo M. Fortes, Andre L. da Silva, Lorena B. Caliman, Fabio C. Fonseca, Douglas Gouvea
Summary: In this study, interfacial segregation was explored as a strategy to enhance the electrical conductivity of Cl--doped ZnO. Cl-anions were found to segregate at the surface and grain boundaries, leading to a significant reduction in electrical resistivity. The calculated electric potential barrier height and activation energy for conduction also decreased with Cl-doping.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Ceramics
Ya-nan Li, Ping Wu, Shiping Zhang, Yili Pei, Jinguang Yang, Sen Chen, Li Wang
Summary: The study investigates the enhancement of thermoelectric performance of Ca3Co4O9 ceramic samples by adding nano-MoSi2 particles. The experimental results demonstrate that the appropriate addition of MoSi2 particles can increase the carrier concentration, enhance the electrical conductivity and Seebeck coefficient of Ca3Co4O9, and effectively reduce the thermal conductivity. The ZT value is increased by 44.4%.
CERAMICS INTERNATIONAL
(2022)
Article
Chemistry, Multidisciplinary
Jincheng Tong, Amadou Doumbia, Raja U. Khan, Aiman Rahmanudin, Michael L. Turner, Cinzia Casiraghi
Summary: Quantitative measurements of molecular dynamics at the solid-liquid interface are crucial. However, the commonly used analytical techniques have limited sensitivity. By using electrolyte-gated organic field-effect transistors (EGOFETs), it is possible to monitor the crystallization process in real-time and quantify changes in solute concentration and molecular transport rate at the solid-liquid interface.
Article
Physics, Applied
Zhonghao Sun, Huolin Huang, Ronghua Wang, Yanhong Liu, Nan Sun, Feiyu Li, Pengcheng Tao, Yongshuo Ren, Shukuan Song, Hongzhou Wang, Shaoquan Li, Wanxi Cheng, Jun Gao, Huinan Liang
Summary: This study investigated the electrical characteristics of the SiON/AlGaN and SiON/GaN interfaces using fabricated metal-insulator-semiconductor devices. The over-etching in the gate trench resulted in higher trap state density at the SiON/GaN interface, leading to a more obvious degradation of subthreshold swing. Traps located at the SiON/AlGaN interface were found to be at a deeper energy level, causing a greater threshold voltage shift in the drain-bias stress measurement.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
Article
Chemistry, Multidisciplinary
Yun Zhang, Duo Chen, Wang He, Na Chen, Liping Zhou, Lilei Yu, Yanbing Yang, Quan Yuan
Summary: This article summarizes the significant advancements in FET biosensors over the past decade, focusing on interface engineering and biomolecule identification in FET electronic platforms. It comprehensively reviews the applications of FET electronic devices for in vitro detection and real-time monitoring in biological systems, and discusses the key opportunities and challenges in biosensing. The understanding of interface engineering strategies in FET biosensors is expected to inspire the development of highly sensitive, specific, and stable FET biosensors, as well as emerging designs for next-generation biosensing electronics.
ADVANCED MATERIALS
(2023)
Article
Materials Science, Ceramics
Yunzi Xin, Yuya Takeuchi, Takashi Shirai
Summary: This study investigates the influence of ceramic matrix on the semiconductor properties of nano-carbon/ceramic composites, highlighting the importance of controlling the state of nano-carbon generated through ceramic particle surfaces and interfaces in determining the resulting properties of the composites.
CERAMICS INTERNATIONAL
(2021)
Article
Engineering, Electrical & Electronic
Gabriel L. Nogueira, Douglas H. Vieira, Rogerio M. Morais, Jose P. M. Serbena, Keli F. Seidel, Neri Alves
Summary: This study presents an electrolyte-gated vertical field-effect transistor based on spray-deposited zinc oxide/silver nanowire Schottky contact, operating effectively at sub-1 V bias without being affected by the electrolyte or cyclic voltammetry. The device exhibits a high I-ON/I-OFF ratio, on-current density and normalized transconductance, positioning the ZnO-EGVFET structure at the forefront of printed transistor development without requiring high-resolution patterns.
IEEE ELECTRON DEVICE LETTERS
(2021)
Article
Materials Science, Multidisciplinary
V. R. Chandegara, Payal Joshi, Sangita Chavda, H. M. Oza, Mayur Parmar, Davit Dhruv, P. S. Solanki, D. D. Pandya, A. D. Joshi, N. A. Shah, R. K. Trivedi
Summary: In this research, the structural, microstructural, optical and electrical properties of CuO/ZnO nanoparticle/nanorod composites in PVA matrix were investigated using a two-step sol-gel technique. The synthesized samples were characterized using X-ray diffraction, Field Emission Scanning Electron Microscopy, Energy Dispersive X-ray analysis, UV-visible spectroscopy, and an LCR meter. The results confirmed the crystalline properties of CuO and ZnO metal oxides in the PVA matrix and analyzed the optical and electrical behaviors of the composites.
Article
Chemistry, Analytical
Yamujin Jang, Young-Min Seo, Hyeon-Sik Jang, Keun Heo, Dongmok Whang
Summary: This study proposes a novel graphene transfer technique for fabricating graphene field-effect transistors, which avoids detrimental organic contamination on the graphene surface. Compared to traditional organic film transfer methods, directly depositing Au film on the graphene substrate can protect graphene channels from contamination.
Article
Biochemical Research Methods
Xinwu Xie, Jinbiao Ma, Hao Wang, Zhen Cheng, Tie Li, Shixing Chen, Yaohua Du, Jianguo Wu, Can Wang, Xinxi Xu
Summary: Silicon nanowire-field-effect transistor (SiNW-FET) biosensors offer advantages such as high speed, sensitivity, specificity, and ease of integration, but they also have some drawbacks. In this work, a self-contained and integrated microfluidic nano-detection system containing a SiNW-FET biosensor was developed. The system demonstrated stability, accuracy, and feasibility for bio-detection, as well as potential for molecular interaction analysis.
Article
Chemistry, Analytical
Manoharan Arun Kumar, Ramasamy Jayavel, Shanmugam Mahalingam, Junghwan Kim, Raji Atchudan
Summary: Universal platforms utilizing sensor devices to analyze biomolecules can effectively address diagnostic challenges. Graphene-based field-effect transistors, such as the Graphene Field-Effect Transistor (GFET) devices, are capable of sensing DNA hybridization, pH levels, and protein molecules, making them ideal for biomarker detection.
Article
Engineering, Electrical & Electronic
Weifeng Jin
Summary: In recent years, the high electric field transport characteristics in monolayer/few-layer MoS2 FETs have been a focus of research. However, there is a lack of comprehensive reviews on this topic. In this article, the recent advancements in numerical simulation and experimental investigation of high electric field transport in monolayer/few-layer MoS2 FETs are analyzed. Promising research directions to improve the characteristics are discussed, and important parasitic effects, such as self-heating, are briefly introduced. This article provides valuable guidance for future design of high-performance monolayer/few-layer MoS2 FETs.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2023)
Article
Construction & Building Technology
Georgeta Voicu, Georgiana-Andreea Tiuca, Alina-Ioana Badanoiu, Alina- Maria Holban
Summary: The study demonstrates the improvement of antimicrobial efficiency of cement through the addition of bioactive ZP and the delay of cement hydration and hardening processes. Additionally, silica nano powder can enhance the mechanical strengths of cement.
JOURNAL OF BUILDING ENGINEERING
(2022)
Article
Chemistry, Physical
Nguyen T. T. Binh, Cuong Q. Nguyen, Tuan V. Vu, Chuong Nguyen
Summary: In this study, ultra-thin van der Waals heterostructures were constructed between graphene and a new 2D Janus MoGeSiN4 material to investigate their interfacial electronic properties and tunable Schottky barriers. The results showed that the graphene/MoGeSiN4 heterostructures have high carrier mobility, making them suitable for high-speed nanoelectronic devices. Depending on the stacking patterns, either an n-type or a p-type Schottky contact is formed at the interface, which can be transformed under strain engineering and electric field.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Lei Xing, Tian Xia, Qiaoxin Zhang
Summary: In this study, superhydrophobic surfaces were successfully prepared using hydrophobic nano-SiO2 particles as spray fillers. The influence of the concentration change of hydrophobic nano-SiO2 particles on their wettability was explained according to the Cassie and Wenzel theory. The results provide important insights for advancing the practical application of superhydrophobic surfaces.
Article
Materials Science, Multidisciplinary
Simon Schweidler, Henrik Schopmans, Patrick Reiser, Evgeniy Boltynjuk, Jhon Jairo Olaya, Surya Abhishek Singaraju, Franz Fischer, Horst Hahn, Pascal Friederich, Leonardo Velasco
Summary: High-entropy alloys offer a wide research area for new material compositions and applications. A high-throughput magnetron sputtering synthesis method is presented to fabricate a new HEA gradient layer, allowing for the study of the composition of the HEA system and the influence of individual elements on material properties.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Alexander D. Dupuy, Mohammed Reda Chellali, Horst Hahn, Julie M. Schoenung
Summary: The formation mechanisms of Cu-rich and Co-rich secondary phases in rocksalt-structured entropy-stabilized oxides were studied. It was found that these secondary phases do not nucleate directly, but first form precursor phases rich in Cu and Co, respectively, and then undergo structural transformations. The growth of secondary phases is controlled by cation diffusion within the primary phase.
JOURNAL OF MATERIALS RESEARCH
(2023)
Article
Materials Science, Multidisciplinary
Yemao Lu, Horst Hahn, Yulia Ivanisenko
Summary: In this study, a CoCrFeMnNi high-entropy alloy with reduced Cr content and the addition of 2 at% C interstitial was processed via high-pressure torsion. The results show that C atoms segregate at the boundaries of nanograins in the sample processed at room temperature, while no notable segregations of carbon were observed in the sample processed at cryogenic temperature.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Abhishek Sarkar, Di Wang, Mohana Kante, Luis Eiselt, Vanessa Trouillet, Gleb Iankevich, Zhibo Zhao, Subramshu S. Bhattacharya, Horst Hahn, Robert Kruk
Summary: Technologically relevant strongly correlated phenomena exhibited by perovskite manganites are enhanced by the coexistence of multiple competing magneto-electronic phases. The recently discovered high entropy oxides exhibit indications of an inherent magneto-electronic phase separation encapsulated in a single crystallographic phase. Combining the high entropy concept with standard property control, the study demonstrates the potential for a synergetic development of strongly correlated oxides offered by the high entropy design approach.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Gleb Iankevich, Abhishek Sarkar, Shyam Katnagallu, Mohammed Reda Chellali, Di Wang, Leonardo Velasco, Ruby Singh, Thomas Reisinger, Robert Kruk, Horst Hahn
Summary: Nanocomposite materials, with the ability to tailor their structural properties and functionalities, play a unique role in materials science. This study demonstrates the possibility of achieving nanocomposites from a bimetallic system, which overcomes the limitations of thermodynamic stability conditions. By co-depositing 2000-atom Ni-clusters and Cu-atoms, nanocomposite samples with different compositions are synthesized. The retention of the metastable nanostructure is confirmed through various characterization techniques. The magnetic properties of the nanocomposites can be tailored by controlling the Ni concentration, offering a promising direction for future research on nanocomposites consisting of fully miscible elements.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Physical
A. Sharma, A. Tripathi, Sree Harsha Nandam, Horst Hahn, K. Eswar Prasad
Summary: Nanoindentation experiments were conducted on a binary Pd-Si metallic glass (MG) and nanoglass (NG) using different indenters to study the effect of indenter geometry on the deformation behavior. It was found that the cube-corner indenter resulted in more pop-ins and higher pile-up compared to the Berkovich indenter. The NG displayed lower hardness than the MG, and the hardness decreased with indentation load. The deformation mode was found to be independent of indenter geometry for both glasses.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Editorial Material
Nanoscience & Nanotechnology
Anatolie S. Sidorenko, Horst Hahn, Vladimir Krasnov
BEILSTEIN JOURNAL OF NANOTECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Mohana Kante, Moritz L. Weber, Shu Ni, Iris C. G. van den Bosch, Emma van der Minne, Lisa Heymann, Lorenz J. Falling, Nicolas Gauquelin, Martina Tsvetanova, Daniel M. Cunha, Gertjan Koster, Felix Gunkel, Slavomir Nemsak, Horst Hahn, Leonardo Velasco Estrada, Christoph Baeumer
Summary: High-entropy materials show promise as high-activity catalysts for electrochemical energy storage due to their tunability and multiple potential active sites. This study examines the catalytic activity of high-entropy perovskite oxides (HEOs) for the oxygen evolution reaction (OER) and finds that HEOs outperform their parent compounds by a factor of 17 to 680. X-ray photoemission studies suggest that simultaneous oxidation and reduction of different transition metal cations contribute to the high activity of HEOs.
Article
Chemistry, Physical
Mohana Kante, Horst Hahn, Subramshu S. Bhattacharya, Leonardo Velasco
Summary: High entropy oxides (HEOs), a new class of materials, have attracted a lot of attention due to their interesting optical, electrochemical, magnetic, and catalytic properties. To understand the complex interactions in these materials, it is important to evaluate them in dense forms, such as pellets or thin films. In this study, dense films of fluorite structured (CeLaSmPrY)O2-x have been synthesized using sol-gel and pulsed laser deposition processes, showing different microstructural characteristics. This research provides a foundation for comprehensive studies and possible applications of dense fluorite (CeLaSmPrY)O2-x films.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Nanoscience & Nanotechnology
Zhenfei Jiang, Weiping Chen, Chenliang Chu, Zhiqiang Fu, Julia Ivanisenko, Hao Wang, Siyuan Peng, Yemao Lu, Enrique J. Lavernia, Horst Hahn
Summary: We report a novel low-cost FeNi0.9Cr0.5Al0.4 high entropy alloy with a unique fibrous heterogeneous solidification microstructure, which consists of fibers-like face-centered-cubic soft phases enveloped in nano-sized ordered body-centered-cubic hard shells. The fibrous microstructure is responsible for its notable mechanical properties, including a yield strength of -670 MPa, an ultimate tensile strength of -1196 MPa, and a uniform elongation of -21.1% at room temperature. The combination of high strength and good ductility is attributed to the hetero-deformation induced hardening mechanism generated from the soft-fiber and hard-shell interface. The cost-effectiveness and outstanding tensile properties make this as-cast FeNi0.9Cr0.5Al0.4 alloy an ideal candidate for structural applications.
SCRIPTA MATERIALIA
(2023)
Article
Nanoscience & Nanotechnology
Junjie Wang, Ning Zhao, Mengyang Yan, Zongde Kou, Shu Fu, Shangshu Wu, Sinan Liu, Si Lan, Zesheng You, Di Wang, Horst Hahn, Tao Feng
Summary: The strength-plasticity synergy of Al/CoCrFeNi nanocrystalline high-entropy alloy composite was achieved via nanoscale diffusion induced phase transition process. The annealed 16%-Al/CoCrFeNi nc-HEAC exhibited a yield strength of 1338 MPa and elongation of 12.1%, showing a combination of outstanding strength and considerable ductility. This work revealed the synergy of multiple strengthening mechanisms and established a novel phase engineering design strategy for high-performance alloys.
SCRIPTA MATERIALIA
(2023)
Article
Chemistry, Multidisciplinary
Shu Fu, Guo-Xing Chen, Hu Guo, Sinan Liu, Mengyang Yan, Yu Lou, Huiqiang Ying, Zhongzheng Yao, Yang Ren, Wei Jiang, He Zhu, Horst Hahn, Tao Feng, Si Lan
Summary: A novel laser-evaporated inert-gas condensation method is developed for synthesizing free-standing MGNPs without substrates or capping agents. This method provides a general strategy for preparing MGNPs with high surface activities, which have immense potential for functional applications.
Article
Chemistry, Physical
Mukesh Kumbhakar, Anurag Khandelwal, Shikhar Krishn Jha, Monaha Veerraju Kante, Pirmin Kessler, Uli Lemmer, Horst Hahn, Jasmin Aghassi-Hagmann, Alexander Colsmann, Ben Breitung, Leonardo Velasco, Simon Schweidler
Summary: High-throughput synthesis and characterization techniques are increasingly important for complex materials and advanced functional compounds. This study focuses on the compilation of high-entropy oxide material libraries with tunable band gaps for semiconductor applications. The material libraries include rare-earth oxides with 5, 6, and 7 different cations in near equimolar concentrations, as well as medium entropy ranges. The atmosphere used during synthesis affects the band gap, and multivalent rare-earth cations enable reversible tuning of the band gap between 2.0 and 3.5 eV under different atmospheres.
ADVANCED ENERGY MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Hendrik Voigt, Aaron Rigoni, Evgeniy Boltynjuk, Harald Roesner, Horst Hahn, Gerhard Wilde
Summary: The crystallization processes of glass-glass interfaces in sputtered CuZr thin film nanoglasses were directly studied using in situ heating experiments in a transmission electron microscope (TEM). By combining in situ technique with symmetry analysis and electron correlation microscopy, correlations between excess volume and nucleation kinetics were obtained on a microscopic scale. It was found that glass-glass interfaces with increased excess volume promoted the onset of crystal nucleation.
MATERIALS RESEARCH LETTERS
(2023)
Article
Chemistry, Physical
Ling Lin, Ziming Ding, Guruprakash Karkera, Thomas Diemant, Mohana V. V. Kante, Daisy Agrawal, Horst Hahn, Jasmin Aghassi-Hagmann, Maximilian Fichtner, Ben Breitung, Simon Schweidler
Summary: High-entropy sulfides (HESs), as a newly developed class of materials, show great potential as efficient electrocatalysts for various reactions. In this study, HESs containing five or six transition metals are synthesized using a one-step mechanochemical process. By comparing the performances and properties of HESs with different compositions and structures with commercial IrO2, it is found that most of the HESs exhibit excellent electrocatalytic performance for the oxygen evolution reaction (OER) under alkaline conditions, outperforming the reference catalyst IrO2.
