Article
Nanoscience & Nanotechnology
Felix Blendinger, Daniel Seitz, Andreas Ottenschlager, Monika Fleischer, Volker Bucher
Summary: TiO2 thin films deposited on PEEK using PEALD method show promising osteogenic properties, enhancing the bioactivity of the implants effectively.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Nanoscience & Nanotechnology
Patrick Hartwich, Christian Pritzel, Manuela S. Killian
Summary: This study proposes an alternative utilization of titanium dioxide by covering surfaces of cement-based materials with a regular-shaped monolayer of photocatalytically active titanium dioxide nanotube arrays. The study also presents a proposal for the synthesis of TiO2 nanotubes and transferring them onto material surfaces, providing the opportunity for applying the material to precast elements.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Environmental Sciences
Sebastian Oyarzabal Rodriguez, Luis Erick Coy-Aceves, Jesus Eduardo Daniel Morales, Jose Luis Sanchez-Salas, Carlos Alberto Martinez-Huitle, Milena Maria Ramirez-Rodrigues, Monica Cerro-Lopez
Summary: Ketorolac, a persistent NSAID, was successfully removed from water through photoelectrocatalysis using titanium dioxide nanotube electrodes, achieving high removal efficiency. This study demonstrated the potential of using titania nanotubes as an alternative material for simultaneous photocatalytic and electrocatalytic processes in water remediation.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Engineering, Chemical
Jianguo Li, Longfei Hui, Wangle Zhang, Jian Lu, Yanjing Yang, Hao Feng
Summary: A high surface area photo-catalytic composite material was synthesized by depositing thin films of titanium dioxide on activated carbon particles using atomic layer deposition. The as-prepared TiO2/AC composites exhibited excellent catalytic performance in the photo-catalyzed degradation of methyl orange, attributed to the active phase dispersion, formation of ultra small TiO2 crystals, and easy accessibility of the active sites.
ADVANCED POWDER TECHNOLOGY
(2021)
Article
Chemistry, Physical
Yuanyuan Cui, Kebing Yang, Lanli Chen, Bin Liu, Guang Yang, Yanfeng Gao
Summary: By conducting first-principles calculations, this study explored the interface of VO2/TiO2 superlattices, revealing an alternating metal-insulator behavior with an increasing number of VO2 layers.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Crystallography
Cristina Dumitriu, Alexandra Constantinescu, Cristian Pirvu
Summary: This paper introduces a gliadin detection method based on a titanium nanostructured electrode modified with graphene oxide. The impedance measured at a specific frequency and coating resistance were used for gliadin analysis. The system shows potential for gluten contamination detection in foods.
Article
Chemistry, Analytical
Reza Akhbari Varkani, Hossain-Ali Rafiee-Pour, Mohammad Noormohammadi
Summary: Redox enzymes as biocatalysts have gained increasing attention for developing electronic biomaterials and devices in various applications. In this study, titanium dioxide nanotubes (TNT) were successfully synthesized and used as immobilization substrate for glucose oxidase (GOx), resulting in excellent performance with low detection limit, wide linear range, high stability, and good reproducibility. This promising strategy of integrating enzymes with TNT demonstrates the potential for bioelectrochemical applications.
MICROCHEMICAL JOURNAL
(2021)
Article
Engineering, Chemical
Xingjun Lu, Zhipeng Yue, Bangzhu Peng
Summary: In this study, TiO2 nanotubes were prepared as photocatalysts for the degradation of heat-stable mycotoxin PAT in simulated juice. The results showed that calcinated TNTs-450 had high adsorption performance and photocatalytic activity, completely degrading PAT within a short period of time.
JOURNAL OF FOOD ENGINEERING
(2022)
Article
Chemistry, Physical
Mina Shahmohammadi, Bruna E. Nagay, Valentim A. R. Barao, Cortino Sukotjo, Gregory Jursich, Christos G. Takoudis
Summary: This study focuses on functionalization of PMMA using low-temperature Atomic Layer Deposition (ALD) to deposit TiO2, ZrO2, and TiO2/ZrO2 mixed oxide nanofilms. The coated PMMA showed increased wettability and slightly enhanced nanohardness, while reducing microbial adherence and biofilm formation. This research has important implications for biomedical and engineering applications.
APPLIED SURFACE SCIENCE
(2022)
Article
Chemistry, Physical
Carlos Guerra-Nunez, Barbara Putz, Raluca Savu, Meng Li, Yucheng Zhang, Rolf Erni, Stanislav Mochkalev, Johann Michler, Hyung Gyu Park, Ivo Utke
Summary: This study proposes the radial growth per cycle (rGPC) to quantify the growth process of ALD films on carbon nanotube surfaces, showing that TiO2 nuclei grow from defects to pristine surfaces and are constrained by Van der Waals forces. In-situ Raman measurements determine the growth rate of nuclei and the film closure point, inducing a finite compressive stress on the nanotubes.
APPLIED SURFACE SCIENCE
(2021)
Article
Chemistry, Physical
Warunee Khampa, Chawalit Bhoomanee, Wongsathon Musikpan, Woraprom Passatorntaschakorn, Chatchai Rodwihok, Han S. Kim, Atcharawon Gardchareon, Pipat Ruankham, Duangmanee Wongratanaphisan
Summary: A new passivation method using H2O2-TiO2 interlayer enables effective interfacial bridging between TiO2 and perovskite in C-PSCs, leading to improved photovoltaic performance. By varying the spin coating speed, a suitable TiO2/HT-3000 ETL matrix with low oxygen vacancy and high-quality perovskite film growth was obtained. The TiO2/HT-3000 ETL-based C-PSCs achieved a PCE of 16.23% and showed enhanced long-term stability without encapsulation.
APPLIED SURFACE SCIENCE
(2023)
Article
Energy & Fuels
S. P. Vinodhini, Joseph Raj Xavier
Summary: This work focuses on synthesizing hybrid nanocomposite electrode materials for supercapacitor applications. The performance of different hybrid electrode materials, such as MoS2/CNTs, TiO2/CNTs, and MoS2/TiO2/CNTs, was enhanced by incorporating carbon nanotubes (CNTs) into MoS2 and TiO2. The synthesized MoS2/TiO2/CNTs exhibited superior electrochemical performance compared to other hybrid electrode materials, with a higher specific capacitance and lower overall impedance. It also displayed good cycling stability and high energy and power densities.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2022)
Article
Materials Science, Ceramics
Alberto Z. Fatichi, Mariana G. de Mello, Karina D. Pereira, Luisa G. M. Antonio, Augusto D. Luchessi, Rubens Caram, Alessandra Cremasco
Summary: The electrochemical, structural, and biological properties of self-organized amorphous and anatase/rutile titanium dioxide (TiO2) nanotubes deposited on Ti-35Nb-4Zr alloy through anodization-induced surface modification were investigated. The study found that anatase TiO2 exhibited higher surface corrosion resistance and cell viability compared to amorphous TiO2, indicating the importance of TiO2 nanotube crystallization in the material's electrochemical behavior and biocompatibility.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Multidisciplinary
Fernando C. Soares, Jessica C. de Almeida, Rafaella H. Koga, Douglas M. da Silva Del Duque, Gelson T. S. T. da Silva, Caue Ribeiro, Vagner R. de Mendonca
Summary: This paper studied the synthesis of a heterostructure consisting of BiVO4 and TiO2 for photocatalytic application. The heterostructures were synthesized using the building blocks technique with different TiO2/BiVO4 molar ratios under hydrothermal treatment. The as-synthesized samples exhibited higher photocatalytic efficiency due to the separation of the photogenerated charges.
MATERIALS CHEMISTRY AND PHYSICS
(2022)
Article
Chemistry, Physical
Renjing Huang, Ohhun Kwon, Chao Lin, Raymond J. Gorte
Summary: The study compared the HDO of m-cresol using Pt/Nb2O5/MgAl2O4 and Pt/TiO2/MgAl2O4 catalysts, finding that Pt/Nb2O5/MgAl2O4 catalyst showed better coke tolerance and higher selectivity towards toluene production than Pt/MgAl2O4.
JOURNAL OF CATALYSIS
(2021)
Article
Materials Science, Multidisciplinary
Amit Sharma, Oz Mendelsohn, Anuj Bisht, Johann Michler, Raj Kiran Koju, Yuri Mishin, Eugen Rabkin
Summary: It is discovered that alloying pristine crystalline nickel nanoparticles with iron leads to unexpected softening due to the random distribution of solute atoms and nano-size precipitates. This softening effect is observed in particles with different compositions and orientations, and it is associated with premature dislocation nucleation caused by the randomly distributed solute atoms. The manipulation of classical hardening mechanisms in defect-free single-crystalline metal nanoparticles offers new possibilities for controlling their plastic deformation.
Article
Materials Science, Multidisciplinary
Nicolo Maria della Ventura, Peter Schweizer, Amit Sharma, Manish Jain, Thomas Edward James Edwards, J. Jakob Schwiedrzik, Cinzia Peruzzi, Roland E. Loge, Johann Michler, Xavier Maeder
Summary: The strain rate and temperature dependent mechanical response of single crystal magnesium micropillars compressed along the a-axis was investigated. It was found that extension twinning controlled the plasticity at temperatures below 423K, while prismatic dislocation mediated plasticity dominated at temperatures above 423K and strain rates below 10s-1. At higher strain rates, deformation twinning occurred again. The study also provided a detailed analysis of the transition from slip to twin and the influence of thermal and kinetic contributions on the flow stress evolution.
Article
Materials Science, Multidisciplinary
Barbara Putz, Thomas E. J. Edwards, Emese Huszar, Patric A. Gruber, Kevin-P Gradwohl, Patrice Kreiml, Daniel M. Toebbens, Johann Michler
Summary: A series of Al and Al/Al2O3 thin-film multilayer structures were fabricated on flexible polymer substrates using a unique deposition chamber combining magnetron sputtering and atomic layer deposition, and were thoroughly characterized using transmission electron microscopy. The electromechanical behavior of the multilayers and Al reference films was investigated, and it was found that all films exhibited excellent interfacial adhesion without delamination in the investigated strain range. The adhesion-promoting naturally forming amorphous interlayer was confirmed for the first time for thin films sputter deposited onto polymers under laboratory conditions.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Chemistry, Analytical
Agnieszka Priebe, Abdessalem Aribia, Jordi Sastre, Yaroslav E. Romanyuk, Johann Michler
Summary: Massive demand for Li-ion batteries drives the research of new materials for next-generation batteries, such as all-solid-state batteries. TOF-SIMS shows outstanding potential for comprehensive characterization of novel Li-rich nickel manganese cobalt oxide thin films, potential cathode materials. The investigation reveals the presence of overlithiated grains and nanoparticles in the buried part of the thin films.
ANALYTICAL CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Alexander Groetsch, Samuel Stelzl, Yannick Nagel, Tatiana Kochetkova, Nadim C. Scherrer, Aleksandr Ovsianikov, Johann Michler, Laszlo Pethoe, Gilberto Siqueira, Gustav Nystroem, Jakob Schwiedrzik
Summary: This study demonstrates the fabrication of non-cytotoxic nanocomposite ink using cellulose nanocrystals (CNCs) as reinforcement for printing and tuning complex 3D structures. It shows that the addition of CNCs significantly increases the stiffness of the composites. The insights gained from this study have implications for applications in medical, electronic, and energy fields.
Article
Materials Science, Coatings & Films
Caroline Hain, Peter Schweizer, Patrick Sturm, Aurelio Borzi, Jonathan E. Thomet, Johann Michler, Aicha Hessler-Wyser, Thomas Nelis
Summary: This study focuses on the fabrication of InN thin films at low temperature using microwave plasma-assisted reactive high power impulse magnetron sputtering (MAR-HiPIMS). The effects of microwave plasma on the HiPIMS discharge process were investigated through in situ diagnostics. InN films were deposited using both standard reactive HiPIMS and MAR-HiPIMS methods, and their properties were characterized. Results showed that the microwave plasma facilitated the dissociation/activation of nitrogen species and provided seed electrons to the plasma. The MAR-HiPIMS film exhibited stoichiometry, texturing, and desirable electrical properties.
SURFACE & COATINGS TECHNOLOGY
(2023)
Article
Chemistry, Physical
Huifang Hu, Ying Kong, Menglong Liu, Viliam Kolivoska, Alexander V. Rudnev, Yuhui Hou, Rolf Erni, Soma Vesztergom, Peter Broekmann
Summary: The application of gas diffusion electrodes (GDEs) for the electrochemical reduction of CO2 to value-added products has the potential to achieve high current densities. However, maintaining stable operation at such high reaction rates is challenging due to the flooding of the GDE. The chemical composition of the applied catalyst inks, particularly the excessive presence of polymeric capping agents, can lead to the blockage of micropores and hinder effective electrolyte perspiration inside the GDE structure.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)
Article
Nanoscience & Nanotechnology
Nicolo M. della Ventura, Chunhua Tian, Amit Sharma, Thomas E. J. Edwards, J. Jakob Schwiedrzik, Roland E. Loge, Johann Michler, Xavier Maeder
Summary: Single-crystal magnesium micropillars with a diameter of 5 µm were compressed along the [2110] direction at cryogenic temperature (T = 184 K) at different strain rates. The predominant twinning behavior of {1012} was observed, and the critical stress required for twinning was found to be significantly higher compared to previous reports at higher temperatures. The temperature dependence of the strain rate sensitivity and activation volume for twinning was determined to be constant and linearly dependent with T, respectively, and the activation energy (Q) for twinning was calculated to be 174 kJ mol-1 for T < 273 K and 72 kJ mol-1 above.
SCRIPTA MATERIALIA
(2023)
Article
Chemistry, Multidisciplinary
Jakub Jurczyk, Katja Hoeflich, Katarzyna Madajska, Luisa Berger, Leo Brockhuis, Thomas Edward James Edwards, Czeslaw Kapusta, Iwona B. Szymanska, Ivo Utke
Summary: Gas-assisted focused electron-beam-induced deposition is a versatile tool for direct writing of complex-shaped nanostructures with unprecedented shape fidelity and resolution. The direct electron beam writing of silver is still in its early stage of development, and the potential precursors for focused electron-beam-induced deposition of silver are examined and compared in this study.
Article
Chemistry, Multidisciplinary
Thaylan Pinheiro Araujo, Jordi Morales-Vidal, Georgios Giannakakis, Cecilia Mondelli, Henrik Eliasson, Rolf Erni, Joseph A. Stewart, Sharon Mitchell, Nuria Lopez, Javier Perez-Ramirez
Summary: Ternary Pd-In2O3/ZrO2 catalysts prepared by wet impregnation exhibit selective and stable architecture under CO2 hydrogenation conditions, irrespective of the order of addition of Pd and In phases on the zirconia carrier. The rapid restructuring of the catalysts is driven by the metal-metal oxide interaction energetics. The presence of InPdx alloy particles decorated by InOx layers prevents performance losses associated with Pd sintering.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Materials Science, Multidisciplinary
Alexander Vogel, Alicia Ruiz-Caridad, Johanna Nordlander, Rolf Erni, Morgan Trassin, Marta D. Rossell
Summary: In this study, the crystal and electronic structure of YMnO3 thin films were investigated using scanning transmission electron microscopy and electron energy loss spectroscopy. The phase transition and changes in the electronic structure were observed and analyzed. The study demonstrated the sensitivity of the O-K near-edge structure to structural distortions in YMnO3 polymorphs, providing important insights for future research on polymorphic phase transformations in improper ferroelectrics.
Article
Chemistry, Multidisciplinary
Xianwei Wang, Jiangtao Zhao, Henrik Eliasson, Rolf Erni, Abolfazl Ziarati, Siobhan Mckeown Walker, Thomas Burgi
Summary: Depositing Au-25 nanoclusters onto a manganese oxide support produces a stable and highly active catalyst. By optimizing the pretreatment temperature, the performance of the Au-25/MnO2 catalyst in low-temperature CO oxidation can be significantly enhanced.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Nanoscience & Nanotechnology
Chiara Ricca, Elizabeth Skoropata, Marta D. Rossell, Rolf Erni, Urs Staub, Ulrich Aschauer
Summary: A highly ordered Moire dislocation lattice has been discovered recently, and the structure and defect chemistry of these dislocations have been investigated through experimental characterization and computational calculations. The results show the presence of undercoordinated light metal cations and oxygen vacancies at the dislocation cores, which may affect the properties of complex multifunctional heterostructures and result in the reduction of Ti ions through electron doping.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Multidisciplinary
Henrik Eliasson, Yubiao Niu, Richard E. Palmer, Henrik Gronbeck, Rolf Erni
Summary: Based on scanning transmission electron microscopy, direct evidence is provided to show how the metal-support interaction affects the structure of supported nanoparticles. It is found that Pt nanoparticles on CeO2 exhibit facet-dependent support interaction, which determines the dimensionality of the particles. Pt particles consisting of less than approximately 130 atoms prefer a 3D shape on CeO2(111) facets, while 2D raft structures are favored on CeO2(100) facets.
