Article
Chemistry, Multidisciplinary
Chuanwei Huang, Zhaolong Liao, Mingqiang Li, Changxin Guan, Fei Jin, Mao Ye, Xierong Zeng, Tianjin Zhang, Zuhuang Chen, Yajun Qi, Peng Gao, Lang Chen
Summary: A practical and universal method is demonstrated to achieve highly strained phases in Pb-based ferroelectric films, which possess unexpected enhancements in properties such as Poisson's ratio, negative thermal expansion, spontaneous polarization, and Curie temperature, surpassing their bulk counterparts. This strategy efficiently overcomes the limitations of discrete substrates and enables continuous regulations of exploitable lattice states in functional oxide films.
Article
Chemistry, Physical
L. Khomenkova, H. Merabet, M. -P. Chauvat, C. Frilay, X. Portier, C. Labbe, P. Marie, J. Cardin, S. Boudin, J. -M. Rueff, F. Gourbilleau
Summary: The effect of Er precursor nature and annealing treatment on the properties of Er2O3 films grown on Si substrates was studied. Annealing resulted in film crystallization and the formation of Er silicate phase. The light emitting properties were determined by native defects and intra-4f shell transition. The intense Er3+ emission in the films grown with O2-plasma-assisted approach was attributed to a lower contribution of oxygen vacancies and pronounced crystallization of Er silicate phase.
SURFACES AND INTERFACES
(2022)
Article
Chemistry, Multidisciplinary
Dawei Li, Xi Huang, Qiuchen Wu, Le Zhang, Yongfeng Lu, Xia Hong
Summary: This study demonstrates the modulation of the amplitude and polarization of second harmonic generation (SHG) signal in monolayer MoS2 by interfacing it with PZT thin films and membranes. The control of the SHG light polarization is achieved through ferroelectric domain patterning, utilizing the interfacial coupling between MoS2 and PZT. This work provides a new material platform for reconfigurable design of light polarization at the nanoscale.
ADVANCED MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Yoonho Ahn, Jong Yeog Son
Summary: The study investigated the deposition-rate-dependent ferroelectric properties of BaTiO3 thin films fabricated through pulsed laser deposition, revealing an enhancement in ferroelectric properties with increased tetragonality. It was also found that the deposition rate affects the leakage current and bandgap energy of the films.
MATERIALS RESEARCH BULLETIN
(2022)
Article
Chemistry, Physical
Mohd. Shkir, Z. R. Khan, Abdullah S. Alshammari, M. Gandouzi, I. M. Ashraf, S. AlFaify
Summary: La@CdS nanostructured thin films were successfully fabricated on glass substrates with hexagonal wurtzite structure and demonstrated excellent opto-nonlinear and visible light photo-detection properties. The optical band gap values of the films ranged from 2.40 to 2.42 eV, while the third order nonlinear optical susceptibility values were remarkably enhanced after La doping.
SURFACES AND INTERFACES
(2021)
Article
Materials Science, Multidisciplinary
Yanyan Zhang, Yong Pan
Summary: The study investigates the influence of oxygen and argon concentrations on the growth and properties of amorphous indium gallium zinc oxide (IGZO) thin films. The addition of mixed gases with different proportions of oxygen and argon during the preparation process was found to affect the absorption spectra, photoluminescence behavior, surface roughness, and carrier concentration of the IGZO films. The results show that controlling the atmosphere during preparation is important for achieving desired properties of IGZO for optoelectronic devices.
Article
Polymer Science
Matthew J. Herman, Michael R. Bull, Erik B. Watkins, Daniel E. Hooks, Nathan A. Miller, Cheng Liu, John D. Yeager
Summary: This study reports neutron reflectometry (NR) studies of bio-mimetic polymer polydopamine (PDA) deposited from differing initial concentrations of precursor material dopamine hydrochloride. Confocal laser scanning microscopy (CLSM) and atomic force microscopy (AFM) were performed to understand the surface structure and mechanical differences of PDA. The results show that film structure and quality are heavily impacted by the initial concentration of dopamine hydrochloride and the polymerization time, indicating the highly customizable nature of PDA.
Article
Nanoscience & Nanotechnology
Stuart R. Burns, Alexander Tselev, Anton V. Ievlev, Joshua C. Agar, Lane W. Martin, Sergei V. Kalinin, Daniel Sando, Petro Maksymovych
Summary: Ferroelectric thin films demonstrate tunable microwave frequency electronic response through domain walls, opening up possibilities for ferroelectric memristors or volatile resistive switches operating at the nanoscale with well-defined dynamics. The mechanism behind tunable microwave conductivity is found to be the variable area of the domain wall within the switching volume.
ADVANCED ELECTRONIC MATERIALS
(2022)
Article
Chemistry, Physical
Pariasadat Musavigharavi, Andrew C. Meng, Dixiong Wang, Jeffery Zheng, Alexandre C. Foucher, Roy H. Olsson, Eric A. Stach
Summary: The local atomic structure and nanoscale chemistry of ferroelectric aluminum scandium nitride thin films were investigated using advanced transmission electron microscopy techniques. The study revealed that in ultrathin films, the Sc alloying concentration and strain distribution become more pronounced.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Chemistry, Inorganic & Nuclear
Ali A. Ati, Alyaa H. Abdalsalam, Haidar Hashim Abbas
Summary: In this study, copper-ferrite nano-crystallite was synthesized using the gel method and deposited on a microscope glass substrate using a pulse laser deposition technique. The structural, morphological, thermal, magnetic, and optical properties of the thin films were characterized. The results showed that the copper-ferrite films had potential applications as gas sensors.
INORGANIC CHEMISTRY COMMUNICATIONS
(2022)
Article
Nanoscience & Nanotechnology
Sergio Gonzalez Casal, Xiaofei Bai, Kevin Alhada-Lahbabi, Bruno Canut, Bertrand Vilquin, Pedro Rojo Romeo, Solene Brottet, David Albertini, Damien Deleruyelle, Matthieu Bugnet, Ingrid Canero Infante, Brice Gautier
Summary: Mechanical switching of ferroelectric domains is achieved in PbZr0.2Ti0.8O3 thin films obtained by the sol-gel method, with a thickness of up to 200 nm, by applying a force higher than a given threshold.
ADVANCED ELECTRONIC MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Dhanapal Pravarthana, Jiafeng Wei, Baomin Wang, Fan Luo, Huali Yang, Shanshan Guo, Zeeshan Mustafa, Wilfrid Prellier, Run-Wei Li
Summary: The research explores methods to achieve deterministic creation of multiple ferroelectric states with variant values of polarization in ferroelectric thin films. It suggests that multistep switching can be achieved by controlling domain structure and inducing local disorder. Different crystal orientations were found to influence the stability of multistep polarization reversal, and a high-throughput method was used to fabricate films with different crystal orientations.
ADVANCED MATERIALS INTERFACES
(2021)
Article
Chemistry, Physical
Prajna P. Mohapatra, Pamu Dobbidi
Summary: The demand for ferrites in the form of thin films has increased due to the growth in microwave and semiconductor industries. LiDy0.1Fe4.9O8 films and their capacitors with different thicknesses were fabricated using PLD. The properties of the films were influenced by lattice mismatch, grain size, and magnetoelastic energy density. The varying thickness of the film was found to be an effective parameter for tuning its physical properties.
APPLIED SURFACE SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
Mukhlis M. Ismail, Suaad S. Shaker, Raghad A. Kamil
Summary: Cobalt ferrite and CoLa0.01Fe1.99O4 thin films were prepared using the pulsed laser deposition method and characterized by XRD analysis. The films exhibited strong (311) peak corresponding to cubic spinel cobalt ferrite phase, with some peaks of alpha-Fe2O3 hematite phase that decreased after La ion doping. Increasing the pulse laser energy from 500 to 650 mJ significantly improved the crystallization of the films. The lattice constant of the cobalt ferrite films increased with the laser energy, while the crystallite size decreased. The magnetic properties of the films were studied by increasing the pulse laser energy and Lanthanum doping.
ECS JOURNAL OF SOLID STATE SCIENCE AND TECHNOLOGY
(2023)
Article
Physics, Applied
Sudhir Regmi, Zhong Li, K. C. Shambhu, Rabin Mahat, Ankur Rastogi, Ranjan Datta, Arunava Gupta
Summary: Epitaxial thin films of cobalt ferrite have been successfully grown on isostructural substrates using pulsed laser deposition. The films on ZnGa2O4 substrates are defect-free and under slight compressive strain, while the films on MgGa2O4 substrates show strain relaxation and defect formation.
APPLIED PHYSICS LETTERS
(2022)
Article
Multidisciplinary Sciences
Chaorui Qiu, Bo Wang, Nan Zhang, Shujun Zhang, Jinfeng Liu, David Walker, Yu Wang, Hao Tian, Thomas R. Shrout, Zhuo Xu, Long-Qing Chen, Fei Li
Article
Instruments & Instrumentation
Mark G. Dowsett, Pieter-Jan Sabbe, Jorge Alves Anjos, Eleanor J. Schofield, David Walker, Pam Thomas, Steven York, Simon Brown, Didier Wermeille, Mieke Adriaens
JOURNAL OF SYNCHROTRON RADIATION
(2020)
Article
Chemistry, Multidisciplinary
Jamie L. Manson, Samuel P. M. Curley, Robert C. Williams, David Walker, Paul A. Goddard, Andrew Ozarowski, Roger D. Johnson, Anuradha M. Vibhakar, Danielle Y. Villa, Melissa L. Rhodehouse, Serena M. Birnbaum, John Singleton
Summary: The study shows that tuning the single-ion anisotropy of a magnetic lattice site by Zn-substitution on nearby sites can significantly change the zero-field splitting. This approach has potential applications in the design of single-ion magnets and other molecule-based magnetic systems.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2021)
Article
Chemistry, Multidisciplinary
Jessica Marshall, David Walker, Pamela Thomas
Summary: The phase diagram of the novel ferroelectric relaxor, xBi(Zn2/3Nb1/3)O-3-(1 - x)BaTiO3 (BZN-BT), was determined for the first time using high-resolution X-ray and neutron diffraction techniques. The study identified composition-dependent effects and temperature-dependent phase transitions for different compositions of the BZN-BT system.
JOURNAL OF APPLIED CRYSTALLOGRAPHY
(2021)
Article
Energy & Fuels
Ailish Wratten, Sophie L. Pain, David Walker, Arne Benjamin Renz, Edris Khorani, Tim Niewelt, Nicholas E. Grant, John D. Murphy
Summary: This study investigates the effective surface passivation mechanism of silicon with hafnium oxide thin films grown via atomic layer deposition (ALD). The study finds that postdeposition annealing can activate the passivation, with the most effective temperature being 475°C. The passivation level continues to increase with higher annealing temperatures, reaching a peak at 475°C, and then decreases above this temperature due to a loss of chemical passivation.
IEEE JOURNAL OF PHOTOVOLTAICS
(2023)
Article
Nanoscience & Nanotechnology
A. Wratten, D. Walker, E. Khorani, B. F. M. Healy, N. E. Grant, J. D. Murphy
Summary: It has been demonstrated in this study that hafnium oxide (HfO2) thin films grown via atomic layer deposition on silicon and silicon precoated with aluminum oxide (Al2O3) possess tunable etch resistance properties. The etching rates of the films were found to be dependent on the post-deposition annealing temperature, with a decrease in etch rate observed at higher temperatures. Crystallized HfO2 films annealed above 350 degrees C exhibited resistance to 10% HF solutions for several hours.
Article
Nanoscience & Nanotechnology
Nathaniel P. Gallop, Dumitru Sirbu, David Walker, James Lloyd-Hughes, Pablo Docampo, Rebecca L. Milot
Summary: This study reports on the emission of high-intensity pulsed terahertz radiation from metal-free halide perovskite single crystal under femtosecond illumination. The angular dependence of THz emission was found to be modulated by phonon resonances, and the THz pulses showed a high peak-to-peak electric field strength.
Article
Chemistry, Physical
F. M. Maddar, D. Walker, T. W. Chamberlain, J. Compton, A. S. Menon, M. Copley, I. Hasa
Summary: This study investigates the properties and dehydration effects of a Prussian White (PW) cathode material (Na2-xFe[Fe(CN)(6)](1-y)& BULL;zH(2)O). It is found that the dehydration process is kinetically driven and strongly influenced by experimental conditions and the environment of the PW system. Optimal conditions for transitioning to a sodium-rich dehydrated rhombohedral phase are identified.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)
Article
Chemistry, Physical
Sai S. H. Dintakurti, David Walker, Tobias A. Bird, Yanan Fang, Tim White, John Hanna
Summary: This study reports the complete miscibility of Cs+ and MA(+) cations in lead chloride and lead bromide perovskites, achieved through a simple, cost-effective mechanochemical synthesis. The solvent-free approach induced high structural order across the entire compositional range, with the multinuclear NMR data showing sensitivity to the changing solid solution compositions within the MAPbX(3)-CsPbX3 system.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Chemistry, Physical
Haytham E. M. Hussein, Richard Beanland, Ana M. Sanchez, David Walker, Marc Walker, Yisong Han, Julie Macpherson
Summary: Using electrochemical potential pulse methodology in a mixed solvent system, amorphous V2O5 nanobelts were successfully electrochemically deposited. Crystallization was achieved through in-air annealing, and in situ heating TEM showed the crystallization temperature and nanobelt dimensions. Reversibility studies revealed the maximum specific capacity and morphological changes during lithium intercalation and de-intercalation, indicating the reversibility between alpha-V2O5 and omega-Li3V2O5.
JOURNAL OF MATERIALS CHEMISTRY A
(2022)
Article
Physics, Applied
Jessica Marshall, David Walker, Pam Thomas
JOURNAL OF ADVANCED DIELECTRICS
(2020)
Article
Materials Science, Multidisciplinary
Zeng Luo, Zenghui Liu, David Walker, Steven Huband, Pam A. Thomas, Nan Zhang, Wei Ren, Zuo-Guang Ye
JOURNAL OF MATERIALS CHEMISTRY C
(2020)
Article
Chemistry, Physical
Myung-Eun Song, Deepam Maurya, Yifei Wang, Jue Wang, Min-Gyu Kang, David Walker, Pam A. Thomas, Scott T. Huxtable, Robert J. Bodnar, N. Q. Vinh, Shashank Priya
ACS APPLIED ENERGY MATERIALS
(2020)
Article
Nuclear Science & Technology
J. M. Marshall, D. Walker, P. A. Thomas
NUCLEAR MATERIALS AND ENERGY
(2020)
