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
Alexander N. Titov, Alexey S. Shkvarin, Alexander I. Merentsov, Olga V. Bushkova, Evgeniy A. Suslov, Alexey A. Titov, Jose Avila, Maria C. Asensio, Natalia V. Kazantseva, Mikhail S. Postnikov
Summary: The experimental results show the formation of extended ordered S-Ti-Se layers (Janus layers) in the Ti(Se1-xSx)(2) system. Analysis using various techniques reveals that the structure of the solid solution consists of S-Ti-Se and TiCh(2) (Ch = S or Se) Janus layers.
CHEMISTRY OF MATERIALS
(2021)
Article
Chemistry, Physical
Takahiro Mikami, Riki Kato, Yoshihiro Hosokawa, Nobuyoshi Miyamoto, Takashi Kato
Summary: A synthetic morphology-control method is reported to prepare 2D and 1D free-standing zinc oxide materials with ordered and nanoporous structures by converting liquid-crystalline zinc hydroxide carbonate (ZHC) nanoplates. The resultant zinc oxide films and microfibers exhibit nanoporous structures and preferred crystallographic orientations, preserving the alignment of ZHC nanoplates before conversion.
Article
Biochemistry & Molecular Biology
Katarzyna Kupinska, Maciej Michalik, Justyna Krajenta, Magda Bielicka, Karolina Halina Markiewicz, Beata Kalska-Szostko, Agnieszka Zofia Wilczewska
Summary: This study investigated the methods of preparation of zinc oxide-polypropylene nanocomposites and their antibacterial properties. Two methods of ZnO NPs syntheses were carried out and the influence of various factors on the synthesis process was examined. The fabricated PP-ZnO composite showed antibacterial properties against Staphylococcus aureus, Escherichia coli, and Klebsiella pneumoniae.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2023)
Review
Crystallography
Andrei N. Baranov, Petr S. Sokolov, Vladimir L. Solozhenko
Summary: This review examines new approaches for stabilizing metastable phases of zinc oxide and growing ZnO single crystals under high pressures and temperatures. It discusses the stabilization of cubic ZnO modification and solid solutions based on it, and describes a thermodynamic method for zinc oxide melting at high pressures that enables the growth of doped and undoped zinc oxide single crystals. The possibilities of using high pressure to vary phase and elemental composition and create ZnO-based materials are demonstrated.
Article
Chemistry, Physical
Rishabh Gandotra, Yu-Ren Chen, Thangapandian Murugesan, Ting-Wei Chang, Hwan-You Chang, Heh-Nan Lin
Summary: The study demonstrates the morphology dependent antibacterial activities of CuxO/ZnO nanocomposites towards Escherichia coli, with different CuxO nanostructures affecting the antibacterial efficiency. The excellent antibacterial performance is attributed to the combined effects of mechanical piercing of ZnO nanorods, release of Zn2+, Cu2+, and Cu+ ions, and effective generation of reactive oxygen species due to charge separation.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Physical
Yuanxu Liu, Fei Fang, Xiao Sun, Weixin Huang
Summary: Composite photocatalysts undergo in situ restructure during photocatalytic reactions, and the NiO-TiO2 interfacial interaction strongly influences this process. Different structures of the photocatalysts are acquired with increasing Ni loading, and they have varying effects on the photocatalytic activity.
APPLIED SURFACE SCIENCE
(2022)
Article
Multidisciplinary Sciences
Zhen Wang, Jinho Byun, Subin Lee, Jinsol Seo, Bumsu Park, Jong Chan Kim, Hu Young Jeong, Junhyeok Bang, Jaekwang Lee, Sang Ho Oh
Summary: This study investigates the characteristics of ZnO polar surfaces and their influence on the evaporation and crystal growth of ZnO nanostructures. The results demonstrate that the evaporation and crystal growth rates of ZnO vary significantly on different surfaces, with the Zn-terminated ZnO (0001) polar surface exhibiting the fastest rates. The evaporation process on the polar surface accelerates dramatically at approximately 300 degrees C, resulting in the formation of a few nanometer-thick quasi-liquid layer. This quasi-liquid layer controls the dissociative evaporation of ZnO by reacting with Zn and O-2 vapors and the underlying ZnO crystal, and facilitates the desorption of O-2 molecules by catalyzing the disordering of the ZnO lattice.
NATURE COMMUNICATIONS
(2022)
Article
Materials Science, Multidisciplinary
Martin Balog, Moara Marques de Castro, Jaroslav Capek, Peter Svec Jr, Martina Takacova, Lucia Csaderova, Eva Sedlackova, Eliska Svastova, Andrea Skolakova, Drahomir Dvorsky, Jan Pinc, Vojtech Hybasek, Jiri Kubasek, Peter Krizik, Jacek Skiba, Oto Bajana, Ahmed Mohamed Hassan Ibrahim
Summary: The issue of intrinsic microstructural and mechanical instability of Zn-based metals limits their expansion in potential applications of bioresorbable stents and orthopedic fixators. A new concept of stabilization of Zn microstructure by a small fraction of nontoxic nano-metric ZnO dispersoids is proposed for the first time and demonstrated on the particular bioabsorbable model material. The effect of the ZnO dispersoids on post-processing microstructural stability, deformation and strengthening mechanisms, corrosion, and in-vitro biological behavior are pursued.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Chemistry, Physical
Denglei Zhu, Yufan Zheng, Yi Xiong, Chaojun Cui, Fengzhang Ren, Yong Liu
Summary: In this study, a thin sulfur-doped zinc oxide film was grown on zinc foil using a simple chemical method. The film improves the electrical conductivity of the zinc anode, inhibits side reactions, and enables uniform deposition of Zn2+. The film exhibits excellent stability and high reversible capacity in electrochemical tests.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
Joselyn Del Pilar Albadalejo, Suheily Alonso-Sevilla, Nicohl Cintron, Xinran Feng, Angel D. Garcia, Dinorah D. Martinez-Torres, Astrid M. Rodriguez, Natalia Roman-Montalvo, Jose Torres, Yao Yang, Armando Pena-Duarte, Rahul Singhal, Louise M. Debefve, Christopher J. Pollock, Carlos R. Cabrera, Hector D. Abruna, Mitk'el Benedikt Santiago-Berrios
Summary: Metal oxide semiconductors have a wide range of applications, including biosensing and green energy-harvesting technologies. Among them, oxide-based diluted magnetic semiconductors have been proposed for fuel cell applications, but there is still controversy regarding their catalytic mechanism.
ACS APPLIED ENERGY MATERIALS
(2022)
Article
Chemistry, Physical
Joselyn Del Pilar Albadalejo, Suheily Alonso-Sevilla, Nicohl Cintron, Xinran Feng, Angel D. Garcia, Dinorah D. Martinez-Torres, Astrid M. Rodriguez, Natalia Roman-Montalvo, Jose Torres, Yao Yang, Armando Pena-Duarte, Rahul Singhal, Louise M. Debefve, Christopher J. Pollock, Carlos R. Cabrera, Hector D. Abruna, Mitk'El Benedikt Santiago-Berrios
Summary: Metal oxide semiconductors are versatile in various applications, and this study focuses on cobalt-doped zinc oxide materials for electrocatalytic production of hydrogen peroxide.
ACS APPLIED ENERGY MATERIALS
(2022)
Article
Chemistry, Physical
Evelyn Artmann, Tobias Schmider, Timo Jacob, Albert K. Engstfeld
Summary: Nanoporous Au (NPG) has unique properties compared to bulk Au and holds promise for various applications. Understanding the structure formation is essential for tailoring NPG films' properties, such as porosity and thickness, for specific applications. In this study, NPG was prepared by electrochemical reduction of Au oxide formed during high voltage electrolysis on poly-oriented Au single crystal (Au POSC) electrodes. The crystallographic orientation of the substrate affected the macroscopic structure of the NPG films, while the formation of Au oxide was mostly independent of crystallographic orientation.
Article
Nanoscience & Nanotechnology
Johannes Mahl, Oliver Gessner, Johannes Barth, Peter Feulner, Stefan Neppl
Summary: Zinc oxide (ZnO) nanomaterials are important components in chemical and biological sensors, photocatalytic conversion, and photovoltaic technologies. By studying the temperature-dependent surface electronic structure of nanoporous ZnO, researchers have revealed the crucial role of nanoscale confinement of conduction-band electrons in the charge transport and photocatalytic function of complex ZnO nanomaterials.
ACS APPLIED NANO MATERIALS
(2021)
Article
Chemistry, Inorganic & Nuclear
Christoph Janowitz, Ali Mahmoodinezhad, Carlos Morales, Franziska Naumann, Paul Plate, Marvin Hartwig Zoellner, Florian Baerwolf, David Stolarek, Christian Wenger, Karsten Henkel, Jan Ingo Flege
Summary: In this study, an Al2O3/ZnO heterojunction was grown on a Si single crystal substrate using thermal and plasma-assisted atomic layer deposition (ALD). The band offsets and interface formation of the heterojunction were investigated. The results showed that the valence band maximum of Al2O3 is 1.1 eV below that of ZnO, and the conduction band minimum of Al2O3 is 2.3 eV above that of ZnO, indicating a type-I staggered heterojunction. Furthermore, the reduction of ZnO to metallic Zn and the creation of oxygen vacancies in ZnO at the interface region were observed, suggesting a different interface formation mechanism from previous models. This study emphasizes the importance of in situ control of interfacial properties, such as band bending and band offsets.
DALTON TRANSACTIONS
(2022)
Article
Physics, Applied
C. Hou, R. M. Gazoni, R. J. Reeves, M. W. Allen
APPLIED PHYSICS LETTERS
(2019)
Article
Environmental Sciences
Suzana M. Blesic, D. Jean du Preez, Djordje Stratimirovic, Jelena Ajtic, M. Cynthia Ramotsehoa, Martin W. Allen, Caradee Y. Wright
ENVIRONMENTAL RESEARCH
(2020)
Article
Physics, Condensed Matter
J. Borgersen, L. Vines, Y. K. Frodason, A. Kuznetsov, H. von Wenckstern, M. Grundmann, M. Allen, J. Zuniga-Perez, K. M. Johansen
JOURNAL OF PHYSICS-CONDENSED MATTER
(2020)
Article
Biochemistry & Molecular Biology
Caradee Y. Wright, David Jean du Preez, Bice S. Martincigh, Martin W. Allen, Danielle A. Millar, Bianca Wernecke, Suzana Blesic
PHOTOCHEMISTRY AND PHOTOBIOLOGY
(2020)
Article
Medicine, Research & Experimental
Serigne N. Lo, Amelia K. Smit, David Espinoza, Anne E. Cust
Article
Environmental Sciences
Martin W. Allen, Neil Swift, Kathryn M. Nield, Ben Liley, Richard L. McKenzie
Article
Engineering, Electrical & Electronic
Hiep N. Tran, Phuong Y. Le, Billy James Murdoch, Martin W. Allen, Christopher F. McConville, James G. Partridge
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2020)
Article
Physics, Applied
Chikezie C. Onyema, Roger J. Reeves, Martin W. Allen
Summary: MESFETs were fabricated on ZnO thin films grown via mist-CVD, using in situ intentionally oxidized AgOx SC gates to achieve high performance. These devices showed potential for producing low-cost, low operating voltage, transparent thin film transistors due to the significant increase in Schottky barrier height and passivation of oxygen vacancies at the gate-channel interface.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Chemistry, Physical
Rodrigo F. Martinez-Gazoni, Martin W. Allen, Roger J. Reeves
Summary: The study investigated the persistent photoconductivity (PPC) of high-quality SnO2 (101) films grown by molecular beam epitaxy (MBE), showing that the longest duration was achieved under high-vacuum conditions, sensitivity to pressure changes, and the dominant role of water vapor. Increasing carrier concentration significantly increased the duration, while decreasing temperature led to a significant decrease in persistent photoconductivity.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Public, Environmental & Occupational Health
Marco Lee Solano, Samuel Robinson, Martin W. Allen, Gillian Reyes-Marcelino, David Espinoza, Brooke Beswick, Dorothy H. K. Tse, Liyang Ding, Lauren Humphreys, Cathelijne Van Kemenade, Suzanne Dobbinson, Amelia K. Smit, Anne E. Cust
Summary: Interactive educational activities using handheld dosimeters can improve primary school students' knowledge about UV radiation and sun protection. A study in Australia found that students had moderate knowledge about UV and sun protection, but their knowledge significantly improved after a short interactive educational activity using handheld UV dosimeters.
PREVENTIVE MEDICINE REPORTS
(2022)
Article
Biochemistry & Molecular Biology
Sarah E. Cole, Makenzie Hawkins, Kimberly A. Miller, Martin W. Allen, Myles Cockburn
Summary: The incidence of melanoma is increasing, especially among Hispanics in California. Childhood exposure to ultraviolet radiation is found to significantly increase the risk of melanoma. A study conducted in Los Angeles County among Hispanic students in 4th and 5th grade classrooms revealed that wanting to get a tan was associated with less time spent outside, while sun protective knowledge and family discussion of sunscreen were associated with less time spent outside. Most of the UV exposure in this population occurred at school.
PHOTOCHEMISTRY AND PHOTOBIOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Jonty I. Scott, Ryan L. Adams, Rodrigo F. Martinez-Gazoni, Liam R. Carroll, Alison J. Downard, Tim D. Veal, Roger J. Reeves, Martin W. Allen
Summary: A highly scalable method for producing vertically aligned square-shaped Sb-doped SnO2 nanotubes has been reported using mist chemical vapor deposition. These nanotubes exhibit excellent structural quality and have potential applications in gas sensing and catalysis. Fabrication of square SnO2 nanotube diodes and field effect transistors has demonstrated their device potential.
Article
Engineering, Electrical & Electronic
Phuong Y. Le, Hilal Nagib, Luke A. Sylvander, Martin W. Allen, Dougal G. McCulloch, James G. Partridge, Hiep N. Tran
Summary: Volatile lateral memristors fabricated from amorphous SnO2 exhibit synaptic properties and can modulate conductance based on the characteristics of voltage pulses or UVC light. By combining light and voltage pulses, OR/AND logic functions can be achieved using a single device. The device behavior is affected by surface water chemisorption, but the functions are reliably demonstrated regardless of the ambient interaction. Simulation results suggest that these devices can enable hand-written digit recognition with over 90% accuracy when arranged in a suitable array.
ACS APPLIED ELECTRONIC MATERIALS
(2023)
Article
Chemistry, Physical
Simon Astley, Di Hu, Kerry Hazeldine, Johnathan Ash, Rachel E. Cross, Simon Cooil, Martin W. Allen, James Evans, Kelvin James, Federica Venturini, David C. Grinter, Pilar Ferrer, Rosa Arrigo, Georg Held, Gruffudd T. Williams, D. Andrew Evans
Summary: Photoelectron spectroscopy is a powerful tool for characterizing semiconductor surfaces and interfaces. However, it is often limited to ultrahigh vacuum conditions and can only probe the top few atomic layers. Recent advances in instrumentation have addressed these limitations, enabling measurement at near-ambient pressures and real-time monitoring of surface processing. Nevertheless, there are still limitations due to irreversible chemical effects and reversible physical effects. This study demonstrates how real-time and near-ambient pressure photoelectron spectroscopy can be used to identify and quantify these effects.
FARADAY DISCUSSIONS
(2022)
Article
Engineering, Electrical & Electronic
Liam R. Carroll, Rodrigo F. Martinez-Gazoni, Nicola Gaston, Roger J. Reeves, Alison J. Downard, Martin W. Allen
Summary: The study investigates the covalent modification of beta-Ga2O3 surfaces with organic layers to control their surface band bending. The research shows that NP modification leads to upward band bending shifts while ODPA modification results in downward shifts in surface band bending. These findings provide valuable insights for the electronic applications of beta-Ga2O3.
ACS APPLIED ELECTRONIC MATERIALS
(2021)
