Article
Chemistry, Multidisciplinary
Maria Kullmer, Felix Herrmann-Westendorf, Patrick Endres, Stefan Goetz, Hamid Reza Rasouli, Emad Najafidehaghani, Christof Neumann, Rebecka Glaessner, David Kaiser, Thomas Weimann, Andreas Winter, Ulrich S. Schubert, Benjamin Dietzek-Ivansic, Andrey Turchanin
Summary: Artificial photosynthesis for hydrogen production is crucial for green energy sources. This study presents and compares two approaches to incorporate a photoactive Ru-II polypyridine complex into carbon nanomembranes, and investigates their photoactivity and potential applications.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Chemistry, Multidisciplinary
Yi-Chin Lai, Yu-Chieh Chiu, Kai-Wen Chuang, Balaji Ramachandran, I-Feng Wu, Ying-Chih Liao
Summary: In this study, a water transfer method was developed to fabricate thin-film patterns on 3D curvilinear surfaces. By suspending crystalline silver nanoplates in ethanol with a surfactant and spreading the suspension over the water surface, a self-assembled thin film was generated. The thin film could be effectively transferred to object surfaces with nanometer thickness and exhibited superior conductivity without thermal sintering.
Article
Materials Science, Multidisciplinary
Meng Zhang, Hailang Dai, Xianfeng Chen
Summary: Photonic integrated circuits (PICs) are actively developing active devices for optical communication. Currently, the use of carbon quantum dots as a gain medium in photonic cavity lasers has been achieved and proposed. However, challenges remain in achieving narrowband lasing beam output in one direction with real-time tunability and minimized energy losses. This article presents a self-assembled microstructure and proposes a method to obtain tunable, narrowband, unidirectional lasing beams to stimulate further development in PICs integration with lasers.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Chun-Wei Chuang, Franklin Chau-Nan Hong
Summary: The chlorine-assisted growth of epitaxial InGaN and AlGaN crystals at low temperature was achieved with high reproducibility via the reaction between metal trichlorides and nitrogen plasma. By adding hydrogen gas, the problems of etching and appearance of different crystal planes were effectively solved. Controlling the amount of precursor aluminum prevented phase separation in AlGaN crystals. The use of chlorine gas and plasma greatly reduced the process temperatures, expanding the potential applications of low-temperature growth.
CRYSTAL GROWTH & DESIGN
(2023)
Article
Chemistry, Multidisciplinary
Seung-Min Lee, Woo-Jin Lee, Jae-Young Bae, Ji-Woo Gu, Seunghwan Lee, Ki Baek Yeo, Jaewook Lee, Joon-Woo Kim, Ju-Yong Lee, Jeonghyun Kim, Hyejin Jang, Sang Ho Jun, Seung-Kyun Kang
Summary: This study introduces a straightforward and efficient fabrication method for creating high-performance biodegradable electronic devices. By controlling the adhesion between the biodegradable device and substrate, photolithography-based fabrication and transfer printing are achieved, offering potential for mass manufacturing of biodegradable electronics.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Physics, Multidisciplinary
Angelika Knothe, Leonid Glazman, Vladimir Fal'ko
Summary: This study investigates quantum tunnelling transport across few-electron bilayer graphene quantum dots and determines the orbital, spin, and valley composition of single- and two-electron dot states using differential conductance. The findings elucidate spin- and valley-dependent tunnelling mechanisms, providing insights for the utilization of bilayer graphene quantum dots as spin and valley qubits.
NEW JOURNAL OF PHYSICS
(2022)
Article
Chemistry, Multidisciplinary
Joachim E. Sestoft, Aske N. Gejl, Thomas Kanne, Rasmus D. Schlosser, Daniel Ross, Daniel Kjaer, Kasper Grove-Rasmussen, Jesper Nygard
Summary: Unlocking the full potential of nanocrystals in electronic devices is achieved through a scalable platform that combines microtomy with vapor-liquid-solid growth of III/V nanowires. This platform allows for deterministic transfer of large arrays of nanocrystals, enabling single unit control and free choice of substrate. Electronic devices fabricated on cross-sectioned InAs nanowires demonstrate quantum phenomena such as conductance quantization, single-electron charging, and wave interference. Furthermore, this platform can host rationally designed semiconductor/superconductor networks relevant to emerging quantum technologies.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Thomas Auzelle, Florian Ullrich, Sebastian Hietzschold, Chiara Sinito, Stefan Brackmann, Wolfgang Kowalsky, Eric Mankel, Oliver Brandt, Robert Lovrincic, Sergio Fernandez-Garrido
Summary: The optoelectronic properties of GaN surfaces were studied after functionalization with phosphonic acid derivatives, showing significant changes in GaN work function and impacting surface band bending. The internal quantum efficiency of GaN layers and nanowires was significantly affected by the covalent bonding of phosphonic acids, with modifications to internal electric fields and surface states. Phosphonate chemistry shows potential for selective sensing applications in surface functionalization of GaN.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Multidisciplinary
Suhui Wang, Tengxiao Guo, Shuya Cao
Summary: HgSe quantum dots were synthesized using a thermal injection method, and the effects of material ratio, growth time, and reaction temperature on their growth and spectral properties were investigated. The results showed that the highest yield was achieved with a molar ratio of 1.5 for Se source to Hg source. Increasing the reaction temperature led to an increase in the critical radius and spectral red-shift rate. Different particle morphologies could be obtained by varying the growth time.
Article
Polymer Science
Baokai Wang, Shiqin Wan, Mengyang Niu, Mengyi Li, Chang Yu, Zheng Zhao, Weiwei Xuan, Ming Yue, Wenbin Cao, Qi Wang
Summary: With the miniaturization of electronic products, there is an increasing interest in ceramic/polymer composites with excellent thermal conductivity. In this study, silicon nitride nanowires with high aspect ratios were successfully prepared and combined with aluminum nitride particles to prepare composites. The results showed that the nanowires contributed to the construction of a continuous thermal conductive pathway and the use of ice template further improved the thermal conductivity of the composites.
Article
Chemistry, Multidisciplinary
Zheng Dang, Yong Guan, Zhao Wu, Xia-Yu Tao, Ying Xiong, Hao-Bo Bai, Chang-Sheng Shao, Gang Liu, Qing Huang, Li-Jiao Tian, Yang-Chao Tian
Summary: This study demonstrates the controlled biosynthesis of iron sulfide nanoparticles with excellent performance in cancer therapy. Tuning the synthesis rate and yield of FeS NPs can be achieved by altering the initial iron precursor dosage. The FeS NPs exhibit good cancer therapy performance and achieve excellent in vivo therapeutic effects.
Article
Materials Science, Multidisciplinary
Tengfei Liu, Guangchao Yin, Ziqi Song, Jingkun Yu, Xue Yong, Baowei Zhang, Lin Ai, Siyu Lu
Summary: In this study, four chlorosalicylaldehyde-functionalized carbon dots (CDs) with solid-state fluorescence were prepared via molecular self-assembly. The CDs emitted light at wavelengths ranging from 456 to 584 nm, covering the blue to yellow range. The position of the chlorine atom on the aromatic core of chlorosalicylaldehyde affected the conjugation and molecular orbital energy levels of the CDs, resulting in the observed emission. The self-assembly process exhibited isomeric effects and the multicolor luminescence of the CDs makes them potentially useful in light-emitting diodes and fingerprint detection.
ACS MATERIALS LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Tengfei Liu, Guangchao Yin, Ziqi Song, Jingkun Yu, Xue Yong, Baowei Zhang, Lin Ai, Siyu Lu
Summary: In this study, chlorosalicylaldehyde-functionalized carbon dots (CDs) with solid-state fluorescence were prepared via molecular self-assembly. The position of chlorine on the aromatic core of chlorosalicylaldehyde affected the coplanarity and degree of conjugation of the CDs, thereby adjusting their emission wavelengths. The self-assembly process showed distinct isomeric effects, resulting in different morphologies. The multicolor luminescence of the CDs makes them potential candidates for light-emitting diodes, fluorescent films, and fingerprint detection.
ACS MATERIALS LETTERS
(2023)
Review
Chemistry, Physical
Giuseppe Prestopino, Andrea Orsini, Daniele Barettin, Giuseppe Arrabito, Bruno Pignataro, Pier Gianni Medaglia
Summary: The synthesis of crystals with a high surface-to-volume ratio is crucial for advanced electronic devices and sensors. Vertical nanowires aligned with the substrate surface are the easiest way to achieve this. Wet chemistry methods for growing aligned nanowires and functionalizing their surfaces with quantum dots have been studied, and the best results in terms of photoconversion efficiencies have been obtained through slow multi-step local drop casting. Among the materials used, ZnO shows the most promise due to its piezo-phototronic effects.
Article
Chemistry, Physical
Xiaoli Duan, Yu Ding, Ruiyuan Liu
Summary: This article discusses the importance of flexible transparent electrodes in flexible organic solar cells and the advantages of using silver nanowires as an ideal candidate material. However, the stability of silver nanowires as transparent electrodes is a key limitation for their applications. The article provides a comprehensive analysis and summary of the failure mechanisms, reinforced materials, and stability enhancement strategies for silver nanowires, as well as surveys their application in flexible batteries.
MATERIALS TODAY ENERGY
(2023)
Article
Chemistry, Physical
Ariel Augusto Schoenberger, Greta Marie Haselmann, Bernd Wolkenar, Simon Schoenebaum, Peter Mauermann, Stefan Sterlepper, Stefan Pischinger, Ulrich Simon
Summary: The study investigated the storage and oxidation of different hydrocarbons and blends on an oxidation catalyst, analyzing their adsorption and desorption behavior. It was found that the blend storage behavior differs from that of single hydrocarbons.
Article
Chemistry, Multidisciplinary
Xiaochao Wu, Marcus Fischer, Adrian Nolte, Pia Lenssen, Bangfen Wang, Thorsten Ohlerth, Dominik Woell, Karl Alexander Heufer, Stefan Pischinger, Ulrich Simon
Summary: A catalytic coating for cylinder walls in internal combustion engines was developed to improve combustion efficiency and reduce pollutant emissions. The coating showed a reduction in flame quenching at low temperatures and a significant decrease in hydrocarbons and carbon monoxide content.
Article
Electrochemistry
Jannis Kuepper, Xianglin Li, Ulrich Simon
Summary: This study developed a two-dimensional, multiphase KOB model to design an optimized cathode structure. Through validation and studying the influence of cathode porosity, surface area, and thickness on discharge behavior, it was found that higher cathode porosity and surface area can increase discharge capacity and lower discharge overpotential, while using a microporous cathode may not be ideal.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2022)
Article
Chemistry, Physical
Daniel Roehrens, Ahed Abouserie, Bangfen Wang, Greta Haselmann, Ulrich Simon
Summary: We introduce a MW-assisted heterogeneous catalytical setup and discuss the factors influencing the obtained data, providing insights and opportunities for research and development in MW-assisted catalysis.
Article
Chemistry, Physical
Sonam Maiti, Thorsten Ohlerth, Niclas Schmidt, Stephan Aussen, Rainer Waser, Ulrich Simon, Silvia Karthaeuser
Summary: The research synthesized sub-10 nm HfO2 nanocrystals and used them to build microscale and nanoscale test devices. Electrical characterization revealed redox-like behavior in ambient atmosphere and volatile threshold switching in vacuum.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Nanoscience & Nanotechnology
D. Fricker, P. Atkinson, X. Jin, M. Lepsa, Z. Zeng, A. Kovacs, L. Kibkalo, R. E. Dunin-Borkowski, B. E. Kardynal
Summary: We investigated the formation of a 2D wetting layer during quantum dot growth using the droplet epitaxy technique. By combining photoluminescence excitation spectroscopy, lifetime measurements, and transmission electron microscopy, we identified the presence of an InGaAs wetting layer in these quantum dots, even without distinguishable wetting layer luminescence. We observed that increasing the amount of Ga deposited on a GaAs (100) surface prior to the growth of InGaAs quantum dots significantly reduced the emission wavelength of the wetting layer, making it indistinguishable from the GaAs acceptor peak emission. However, increasing the amount of Ga deposited did not suppress the formation of a wetting layer under the growth conditions used here.
Article
Pharmacology & Pharmacy
Sebastian Quintana-Contardo, Orlando Donoso-Gonzalez, Erika Lang, Ariel R. R. Guerrero, Michael Noyong, Ulrich Simon, Marcelo J. J. Kogan, Nicolas Yutronic, Rodrigo Sierpe
Summary: The antineoplastic drug Dacarbazine was encapsulated in beta-cyclodextrin to improve solubility and stability. When combined with plasmonic gold nanoparticles and polyethylene glycol, it exhibited controlled release and potential for drug delivery.
Article
Energy & Fuels
Marcus Fischer, Adrian Nolte, Xiaochao Wu, Dapeng Zhou, Stefan Pischinger, Karl Alexander Heufer, Ulrich Simon, Robert Vassen
Summary: In order to achieve higher efficiencies and reduced pollutant emissions, future vehicle powertrain systems with internal combustion engines need to adopt new advanced technologies. This paper presents a holistic approach by using thermal coatings on the combustion chamber walls to reduce wall heat losses, hydrocarbon, and carbon monoxide emissions. The application of yttria-stabilized zirconia (YSZ) coating allows the wall temperature to follow the gas temperature and perform thermal swing. The results show that the coating can reduce flame quenching distance and total hydrocarbon emission.
Article
Biochemistry & Molecular Biology
Rodrigo Sierpe, Orlando Donoso-Gonzalez, Erika Lang, Michael Noyong, Ulrich Simon, Marcelo J. J. Kogan, Nicolas Yutronic
Summary: Melphalan (Mel) is a widely used antineoplastic drug for cancer and other diseases. In order to improve its solubility and stability, Mel was included in beta-cyclodextrin (beta CD), which is a macromolecule. The beta CD-Mel complex was then used as a substrate to deposit silver nanoparticles (AgNPs) and form a crystalline system. This nanosystem showed increased permeability and has the potential to be used as a nanocarrier for cancer therapy.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2023)
Article
Engineering, Environmental
Huarong Lei, Dongdong Chen, Jia-yue Yang, Abhishek Khetan, Jiuxing Jiang, Baoxiang Peng, Ulrich Simon, Daiqi Ye, Peirong Chen
Summary: This study reveals the low-temperature mechanism of Cu-SSZ-13 zeolite in the NH3-SCR catalysis process, identifying two transient states: O-2-bridged Cu dimers and proximately paired, chemically nonbonded Cu-I(NH3)(2) sites. It demonstrates the high reactivity of Cu(I)(NH3)(2) for NO-to-N-2 reduction at low temperatures. By providing experimental evidence, this study contributes valuable insights into the Cu redox cycle and the design of advanced catalysts for reducing automotive NOx emissions.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Magdalena Jablonska, Ana Palcic, Muhammad Fernadi Lukman, Anna Wach, Marko Bertmer, David Poppitz, Reinhard Denecke, Xiaochao Wu, Ulrich Simon, Andreas Poeppl, Roger Glaeser
Summary: A series of ZSM-5 zeolite materials were successfully synthesized from OSDA-free systems, and the catalysts based on ZSM-5 seeds showed higher NO conversion during NH3-SCR-DeNO(x) process.
Article
Chemistry, Physical
Rebecca Hengsbach, Gerhard Fink, Ulrich Simon
Summary: This study examines the properties of DNA functionalized pNipmam microgels and pure pNipmam microgels at different concentrations of sodium chloride and in PBS solutions using temperature dependent H-1-NMR measurements. The results show that DNA modification affects the volume phase transition temperature and the addition of salt and PBS further enhances this effect.
Article
Chemistry, Physical
Jannis Kuepper, Ulrich Simon
Summary: This study evaluates the influence of oxygen partial pressure on the discharge performance of potassium-oxygen battery (KOB). It is found that low oxygen partial pressure leads to insufficient oxygen transport and reduced discharge performance, while high oxygen partial pressure improves discharge performance and prevents side reactions. These findings suggest that a high-pressure supply of pure oxygen can further increase the cell performance of KOB.
SUSTAINABLE ENERGY & FUELS
(2022)
Article
Chemistry, Physical
Laura Hoppe Alvarez, Andrey A. Rudov, Rustam A. Gumerov, Pia Lenssen, Ulrich Simon, Igor I. Potemkin, Dominik Woell
Summary: The behavior of microgels at solid-liquid interfaces is influenced by the preparation method. Through a combination of experimentation and simulation, it was found that the driving force for deformation of microgels varies depending on the surface and deposition method, and the simulated equilibrium structure is retained after rehydration.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2021)
Article
Nanoscience & Nanotechnology
Jinxuan Liu, Shahriar Heidrich, Jianxi Liu, Biao Guo, Michael Zharnikov, Ulrich Simon, Wolfgang Wenzel, Christof Woell
Summary: This study demonstrates a facile method to encapsulate ligand-stabilized Au-55 clusters within SURMOF thin films, confirmed by various analytical techniques. Computational modeling shows a strong interaction between Au-55 core and the MOF pore ligands, resulting in the removal of PPH3 ligands. The stabilized Au-55 clusters within SURMOF exhibit excellent catalytic activity for the reduction of 4-nitrophenol.
ACS APPLIED NANO MATERIALS
(2021)
