Article
Materials Science, Ceramics
Stanislav Kurajica, Juraj Sipusic, Martina Zupancic, Igor Brautovic, Martin Albrecht
Summary: The influence of TiO2 as a nucleating agent in ZnO-Al2O3-SiO2 glass on crystal phases was studied, with gahnite identified as the main phase in thermal treatment. Without nucleation, crystal size impaired transparency, while nucleated samples showed translucent and dichroic properties.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2021)
Article
Chemistry, Multidisciplinary
Feng Jia, Yu-Ling Shih, David Y. H. Pui, Zi-Yi Li, Chuen-Jinn Tsai
Summary: The study showed that the quenching air flow rate has a significant impact on the generation and characteristics of zinc oxide nanoparticles during chemical vapor synthesis, allowing for control over the geometric mean diameter and total number concentration of the nanoparticles by adjusting the quenching air flow rate. Additionally, increasing the quenching rate can decrease the size of zinc oxide nanoparticles below 10 nm under constant carrier gas flow rate and furnace temperature.
JOURNAL OF NANOPARTICLE RESEARCH
(2021)
Article
Chemistry, Physical
Qi Cai, Valentina Castagnola, Luca Boselli, Alirio Moura, Hender Lopez, Wei Zhang, Joao M. de Araujo, Kenneth A. Dawson
Summary: This study presents an optimized platform for highly controlled synthesis of nanoparticles and a novel approach for mechanistic study of shape-evolving nanomaterials.
NANOSCALE HORIZONS
(2022)
Article
Chemistry, Multidisciplinary
Changjiu Sun, Yuanzhi Jiang, Li Zhang, Keyu Wei, Mingjian Yuan
Summary: Lead halide perovskite nanocrystals (LHP NCs) have great potential in optical sources, photovoltaics, and sensor fields. This Perspective summarizes representative attempts to achieve controlled synthesis of LHP NCs. By changing the synthesis method, LHP NCs with kinetic dominance and size tunability can be obtained. Undesired ripening effects can be eliminated, and homogeneous size distribution can be achieved through rational ligand selection and solvent engineering.
Article
Chemistry, Physical
Chun-Yao Chang, Shanmuganathan Venkatesan, Andy Herman, Chi-Lo Wang, Hsisheng Teng, Yuh-Lang Lee
Summary: Homogeneous and heterogeneous nucleation processes were used to synthesize carbon quantum dots (CDs) by a solvothermal method. The UV-vis and PL properties of CDs prepared by homogeneous and TiO2-induced heterogeneous methods were compared. The results showed that the T-CDs had smaller band gaps and multiple energy levels compared to CDs. The emission wavelengths of CDs and T-CDs were about 530 and 496 nm, respectively, and the quantum yield of T-CDs could reach up to 68%.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Multidisciplinary
Chenxiao Wang, Zhennan Huang, Yong Ding, Minghao Xie, Miaofang Chi, Younan Xia
Summary: This study presents a method for the facet-controlled synthesis of nanocrystals with an ultrathin shell made of a nearly equimolar RuRhPdPt quaternary alloy, showing greatly enhanced activity toward ethanol oxidation. The core-shell nanocubes demonstrate good thermal and electrochemical stability in terms of both geometrical shape and elemental composition, making them a promising candidate for various thermal and electrochemical reactions. The synthetic approach can potentially be extended to fabricate multimetallic catalysts with enhanced activities.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Materials Science, Multidisciplinary
Xin Qi, Yanzhao Ma, Sisheng Liu, Xiangyu Nie, Tao Zhang, Yong Wu, Weiping Peng, Guoming Hu
Summary: This study successfully suppressed the secondary electron emission of polyimide materials under vacuum conditions by preparing graphene coatings on the polyimide surface. The graphene coating possessed an abundant sp2 hybridized structure, which could reduce secondary electron emissions. These findings have important implications for the application of polyimide thin film materials in aerospace, particle gas accelerators, and other fields.
Article
Multidisciplinary Sciences
Joonghoon Choi, Dae Kwon Jin, Junseok Jeong, Bong Kyun Kang, Woo Seok Yang, Asad Ali, Jinkyoung Yoo, Moon J. Kim, Gyu-Chul Yi, Young Joon Hong
Summary: This study presents morphology-controlled remote epitaxy of ZnO micro- and nanostructure crystals on graphene-coated GaN substrate via hydrothermal growth. By changing additives in the wet chemical solution, diverse morphologies of ZnO can be grown from nanowire to microdisk. The direction of ZnO's hexagonal sidewall facet is found to be homogeneous over the entire growth area on the graphene-coated GaN substrate.
SCIENTIFIC REPORTS
(2021)
Article
Chemistry, Physical
C. X. Han, J. Q. Zhi, Z. Zeng, Y. S. Wang, B. Zhou, J. Gao, Y. X. Wu, Z. Y. He, X. M. Wang, S. W. Yu
Summary: Researchers have successfully grown diamond films on high entropy alloys (HEAs) substrates using chemical vapour deposition, which are facilitated by the high carbon solubility and lower nucleation energy barrier of HEAs. Continuous diamond films with high nucleation density and rapid growth have been achieved within 30 minutes, and the corrosion resistance of the specimens in saltwater has been improved due to the continuous diamond film.
APPLIED SURFACE SCIENCE
(2023)
Article
Materials Science, Ceramics
Fu Mingfu, Yang Wen, Li Jiabao, Deng Shukang, Zhou Qihang, Feng Xiaobo, Yang Peizhi
Summary: In this study, the effects of mineralizer components and ratios on the growth of black phosphorus were investigated. It was found that orthorhombic black phosphorus can be synthesized when tin and iodine coexist in the appropriate ratio. The optimal mass ratio of tin and iodine for black phosphorus synthesis was determined to be 0.47, which resulted in the formation of high-quality crystals with a size of 1.2 cm.
JOURNAL OF INORGANIC MATERIALS
(2022)
Article
Chemistry, Physical
Flore Mekki-Berrada, Zekun Ren, Tan Huang, Wai Kuan Wong, Fang Zheng, Jiaxun Xie, Isaac Parker Siyu Tian, Senthilnath Jayavelu, Zackaria Mahfoud, Daniil Bash, Kedar Hippalgaonkar, Saif Khan, Tonio Buonassisi, Qianxiao Li, Xiaonan Wang
Summary: This study presents a two-step framework for rapidly producing silver nanoparticles with desired absorbance spectrum using a machine learning-driven high-throughput microfluidic platform. By combining Bayesian optimization and deep neural network, the framework efficiently optimizes nanomaterial synthesis and extracts knowledge of the relationship between chemical composition and optical properties.
NPJ COMPUTATIONAL MATERIALS
(2021)
Article
Chemistry, Physical
Eric Navarrete, Frank Guell, Paulina R. Martinez-Alanis, Eduard Llobet
Summary: Different thicknesses of Au films were used in the growth of ZnO nanowires, with the 6 nm thick layers showing the most stable and repeatable gas sensing properties. Despite ZnO nanowires grown using the thickest Au layers reaching the highest responses under dry conditions, those grown using the thinnest Au film were more resilient at detecting NO2 in the presence of ambient moisture. The gas sensing results were discussed in light of defects and Au impurities in the ZnO nanowires, as revealed by characterization techniques such as X-ray diffraction, scanning electron microscopy, X-ray photoelectron spectroscopy, and photoluminescence spectroscopy.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Multidisciplinary
Mei Wang, Chiwoo Park, Taylor J. Woehl
Summary: This study utilized liquid phase transmission electron microscopy to directly observe the self-assembly of platinum nanoparticles into dense 3D supraparticles over tens of seconds during colloidal nanoparticle synthesis. Varying interparticle interactions by changing precursor chemistry revealed that supraparticle formation was driven by weak attractive van der Waals forces balanced by short ranged repulsive steric interactions. Growth kinetic measurements and an interparticle interaction model showed that nanoparticle surface diffusion rates on the supraparticles were significantly faster than nanoparticle attachment.
Article
Multidisciplinary Sciences
Lin Zhang, Li Peng, Yuanchao Lu, Xin Ming, Yuxin Sun, Xiaoyi Xu, Yuxing Xia, Kai Pang, Wenzhang Fang, Ning Huang, Zhen Xu, Yibin Ying, Yingjun Liu, Yingchun Fu, Chao Gao
Summary: This paper presents a wet-interfacial Joule heating approach for synthesizing nanomaterials in a fast, programmable, and energy-saving manner. By confining Joule heat at the substrate-solution interface and inducing instantaneous solvent evaporation, the method accelerates and controls the nucleation and growth of nanomaterials. It achieves high crystallization rates, low energy costs, and low precursor concentrations.
NATURE COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Jiamin Tian, Mei Sun, Mengyu Hong, Bocheng Yu, Menglan Li, Yu Geng, Shuo Li, Yue Zhang, Zhihong Li, Qing Chen
Summary: The wet chemical etching process of zinc oxide (ZnO) nanowires in radiolytic water was studied using liquid cell transmission electron microscopy (LCTEM). It was found that the dissolution rate of thin nanowires remains constant with reducing diameter, while thick nanowires exhibit complex etching behaviors. The dissolution rate of thick nanowires is constant at first and then increases, and anisotropic etching occurs at both ends of thick nanowires leading to the formation of distinct tips. The polarity difference at the two ends of the nanowire and the arrangement of sidewall cones determine the shape and formation process of the tips.
Article
Chemistry, Physical
Viktor Mackert, Julia S. Gebauer, Christian Notthoff, Markus Winterer
APPLIED SURFACE SCIENCE
(2018)
Article
Engineering, Chemical
Markus Winterer
CHEMICAL ENGINEERING SCIENCE
(2018)
Article
Instruments & Instrumentation
C. Gorynski, U. Anselmi-Tamburini, M. Winterer
REVIEW OF SCIENTIFIC INSTRUMENTS
(2020)
Article
Chemistry, Physical
Sasa Lukic, Gerdina Wilhelmina Busser, Siyuan Zhang, Jasper Menze, Martin Muhler, Christina Scheu, Markus Winterer
ZEITSCHRIFT FUR PHYSIKALISCHE CHEMIE-INTERNATIONAL JOURNAL OF RESEARCH IN PHYSICAL CHEMISTRY & CHEMICAL PHYSICS
(2020)
Article
Instruments & Instrumentation
Alexander Levish, Markus Winterer
REVIEW OF SCIENTIFIC INSTRUMENTS
(2020)
Article
Thermodynamics
Y. Karakaya, H. Janbazi, I. Wlokas, A. Levish, M. Winterer, T. Kasper
Summary: This study investigates the chemical reaction mechanism of tetramethylsilane in different flame conditions, revealing the significant influence of flame composition on precursor depletion and product formation. The synthesized nanoparticles are spherical with low agglomeration, and the particle size distribution depends on the equivalence ratio of the synthesis flames.
PROCEEDINGS OF THE COMBUSTION INSTITUTE
(2021)
Correction
Instruments & Instrumentation
Alexander Levish, Markus Winterer
REVIEW OF SCIENTIFIC INSTRUMENTS
(2020)
Article
Chemistry, Physical
Viktor Mackert, Martin A. Schroer, Markus Winterer
Summary: This study investigates the factors influencing the deagglomeration, agglomeration, and structure of very small nanoparticles. Experimental results show that the size and size distribution of the particles are influenced by the pH and salt concentration, while the morphology of the agglomerates is mostly influenced by the salt concentration. These findings are important for understanding and controlling the agglomerates of nanostructured materials.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2022)
Article
Engineering, Chemical
T. Rosenberger, I Skenderovic, J. Sellmann, P. Wollny, A. Levish, I Wlokas, A. Kempf, M. Winterer, F. E. Kruis
Summary: In this study, a model flow reactor was used to measure and analyze the sintering kinetics of iron and iron oxide agglomerates using experimental data. The results showed that the addition of hydrogen led to the reduction of iron oxide to iron nanoparticles and changes in the sintering kinetics. This study is important for a deeper understanding of particle structure and sintering behavior.
AEROSOL SCIENCE AND TECHNOLOGY
(2022)
Article
Chemistry, Physical
Jeremias Geiss, Tobias Falk, Stevan Ognjanovic, Sven Anke, Baoxiang Peng, Martin Muhler, Markus Winterer
Summary: This study establishes a direct and quantitative correlation between the structure of Co3-xFexO4 nanoparticles and their catalytic performance. It has been found that the density of defects and the distribution of cations in the nanoparticles play a significant role in their catalytic activity.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Multidisciplinary Sciences
Alexander Levish, Markus Winterer
Summary: A novel chemical vapor synthesis reactor design was used to control the pore-particle mesostructure and investigate the pore formation mechanism. The Kirkendall effect was exploited at the nanoscale to generate ultrasmall pores in small nanocrystalline iron oxide particles. Detailed structural characterization and quantitative data analysis provided a comprehensive description of the hollow nanoparticles.
SCIENTIFIC REPORTS
(2022)
Article
Chemistry, Multidisciplinary
Jeremias Geiss, Jeldrik Schulte, Markus Winterer
Summary: In this study, an alternative flash evaporation system based on a marking laser is proposed and successfully used for accurate precursor delivery and synthesis of nanoparticles. The system enables repeated scanning and sublimation of a large area powder bed at high energy densities.
JOURNAL OF NANOPARTICLE RESEARCH
(2022)
Article
Instruments & Instrumentation
Martin A. A. Schroer, Alexander Levish, Yasin Yildizlar, Maximilian Stepponat, Markus Winterer
Summary: A versatile reactor system for chemical vapor synthesis of nanoparticles is described in this paper, which allows in situ investigations of high temperature gas phase particle formation and transformation processes using x-ray scattering and x-ray absorption spectroscopy.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2022)
Article
Chemistry, Multidisciplinary
Markus Winterer, Jeremias Geiss
Summary: This study overcomes the finite size effects in partial pair distribution functions using a binned version of the Debye scattering equation. Reverse Monte Carlo simulations were performed on very small nanoparticles of LaFeO3 with diameters below 10 nm to analyze X-ray scattering data and extended X-ray absorption fine structure spectra at the La K and Fe K edges simultaneously. The results provide consistent structural information regarding local structure and long-range order.
JOURNAL OF APPLIED CRYSTALLOGRAPHY
(2023)
Article
Chemistry, Physical
J. Geiss, J. Bueker, J. Schulte, B. Peng, M. Muhler, M. Winterer
Summary: The purpose of this study is to examine the structure and identify subtle changes of LaCo1-xFexO3 nanoparticles after catalysis. Small nanoparticles with varying iron content were synthesized and tested in cyclohexene oxidation. The crystal and local structure of the nanoparticles are investigated using X-ray and electron diffraction techniques. The catalytic activities of the cobalt-containing samples are significantly affected by changes in the local structure surrounding the cations in the perovskite phase.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
