Article
Chemistry, Physical
Wei-Hsiang Wang, Chak-Ming Liu, Tzu-Hung Chuang, Der-Hsin Wei, Wen-Chin Lin, Pei-hsun Jiang
Summary: The evolution of micro-patterned magnetic domains in CoPd thin films pretreated with e-beam lithography and O-2 plasma was studied. Different behaviors of the patterned magnetic domains under magnetization reversal were observed during the days-long oxidation, indicating critical changes in local magnetic anisotropy energies due to the different forms of Co oxides. The coercive field in the plasma-exposed area showed a decrease initially but increased after a longer oxidation duration, providing a new dimension for magnetic-domain engineering compared to conventional lithography techniques.
SURFACES AND INTERFACES
(2021)
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
Physics, Applied
T. Harada, T. Nagai, M. Oishi, Y. Masahiro
Summary: This study reports the successful growth of c-axis-oriented PdCoO2 thin films on Al2O3 (001) substrates using magnetron sputtering. The films exhibited layered crystal structures, with a clear interface stacking sequence of Pd/CoO2/Al2O3. This layer stacking induces a high work function at the interface. Post-annealing treatment significantly decreased the resistivity of the films. Impurity phases of PdOx were observed using X-ray diffraction and scanning transmission electron microscopy. The sputtering deposition of c-axis-oriented thin films provides potential practical applications for the polar surface of PdCoO2 in semiconductor devices.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Engineering, Electrical & Electronic
Tingfeng Song, Huan Tan, Romain Bachelet, Guillaume Saint-Girons, Ignasi Fina, Florencio Sanchez
Summary: Epitaxial thin films of HfO2 doped with La have been grown on SrTiO3(001) and Si(001), and the impact of La concentration on the stabilization of the ferroelectric phase has been determined. Films with 2-5 at. % La doping exhibit the least amount of paraelectric monoclinic and cubic phases, highest polarization, and a remanent polarization above 20 mu C/cm(2). La concentration has a significant effect on the coercive field, which decreases with increasing La content. High polarization, retention, and endurance of at least 10(10) cycles are achieved in 5 at. % La-doped films.
ACS APPLIED ELECTRONIC MATERIALS
(2021)
Article
Multidisciplinary Sciences
Phu T. P. Le, Johan E. ten Elshof, Gertjan Koster
Summary: The study demonstrated the creation of freestanding SrRuO3 thin films using Sr3Al2O6 sacrificial layers, which were then successfully transferred onto Si substrates, showcasing the potential for transferring oriented oxide perovskite films onto Si and arbitrary substrates.
SCIENTIFIC REPORTS
(2021)
Article
Multidisciplinary Sciences
Ryo Takakura, Seigo Murakami, Kaname Watanabe, Ryo Takigawa
Summary: In this study, room-temperature wafer bonding of Al2O3 thin films on Si thermal oxide wafers was achieved using the surface-activated bonding (SAB) method. Transmission electron microscopy observations indicated that these room-temperature-bonded Al2O3 thin films worked as nanoadhesives forming strong bonds. The successful dicing of the bonded wafer into small dimensions and the estimated surface energy suggested their potential for device applications. The study also investigated the applicability of different Al2O3 microstructures and verified the effectiveness of ALD Al2O3 in the SAB method. This study opens possibilities for future room-temperature heterogeneous integration and wafer-level packaging.
SCIENTIFIC REPORTS
(2023)
Article
Physics, Applied
Prajwal Lamichhane, Tirtha R. Acharya, Jaewoo Park, Kirubel A. Amsalu, Byoungchoo Park, Eun Ha Choi
Summary: This study investigates the effects of nonthermal plasma characteristics on surface treatments of polyvinyl alcohol. Various diagnostics, such as Raman spectroscopy, work of adhesion, optical emission spectroscopy, and current-voltage measurements, were used. The findings highlight the importance of controlling the plasma's electron temperature and density to achieve desired surface treatment outcomes. Plasma jets with varying electron temperatures are found to be more suitable for different surface treatments, with high electron temperatures (>1.1 eV) suitable for functional group insertion and low electron temperatures for plasma etching, which increases surface roughness significantly.
PLASMA PROCESSES AND POLYMERS
(2023)
Article
Chemistry, Multidisciplinary
Junhyuk Ahn, Sanghyun Jeon, Ho Kun Woo, Junsung Bang, Yong Min Lee, Steven J. Neuhaus, Woo Seok Lee, Taesung Park, Sang Yeop Lee, Byung Ku Jung, Hyungmok Joh, Mingi Seong, Ji-hyuk Choi, Ho Gyu Yoon, Cherie R. Kagan, Soong Ju Oh
Summary: A one-step, ink-lithography technique has been developed to pattern and engineer thin films of colloidal nanocrystals, allowing modification of both the chemical nature of the nanocrystal surface and the physical properties of the thin films. This method has been successfully applied to engineer thin films of metals, semiconductors, and insulators for various applications.
Article
Polymer Science
Felipe Vicente de Paula Kodaira, Ana Carla de Paula Leite Almeida, Thayna Fernandes Tavares, Antje Quade, Luis Rogerio de Oliveira Hein, Konstantin Georgiev Kostov
Summary: A funnel-like atmospheric pressure plasma jet with a wide exit was proposed to overcome the limitation of small treatment area. Gas-permeable cotton cloth covered the nozzle to improve gas flow dynamics. Surface modifications were observed on both sides of the treated samples with different functional groups.
Review
Chemistry, Physical
Wenlei Wang, Yu Wang, Lixuan Yuan, Chaolin You, Junwei Wu, Lili Liu, Jilei Ye, Yunling Wu, Lijun Fu
Summary: This review discusses the major challenges and latest developments in the modification strategies of silicon-based anodes. The strategies include structure optimization, surface/interface regulation, novel binders, and innovative design of electrolyte. Perspectives for future development are also presented.
Article
Optics
Balazs Banhegyi, Laszlo Peter, Peter Dombi, Zsuzsanna Papa
Summary: In this study, we investigated laser-induced periodic surface structures (LIPSS) generated on indium-tin-oxide thin films using femtosecond laser pulses in the infrared region. We observed robust LIPSS morphologies with a periodicity close to lambda/10 using pulses with central wavelengths between 1.6 and 2.4 μm. Finite-difference time-domain calculations support that the surface forms are rooted in the field localization in the surface pits, leading to periodically increased absorption of the laser pulse energy and the creation of the observed periodic structures.
Article
Materials Science, Multidisciplinary
Tianhui Zhu, Yunhui Wu, Shuai Li, Farjana F. Tonni, Masahiro Nomura, Mona Zebarjadi
Summary: Silicon thin films are promising for chip-integrated Peltier micro-coolers and thermoelectric power generators due to their compatibility and cost effectiveness. This study focuses on reducing thermal conductivity by creating patterned nano-holes in single crystalline silicon thin films and surface doping them with organic molecules F4TCNQ. The results show significant improvements in electrical conductivity and power factor.
MATERIALS TODAY PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Parand R. Riley, Pratik Joshi, Jagdish Narayan, Roger J. Narayan
Summary: A method to tailor the surface of silicon-incorporated diamond-like carbon thin films for enhancing diamond nucleation density and growth was reported. By modifying the surfaces of Si-DLC films with fluorine and oxygen species, a significant improvement in micro-diamond nucleation density and growth was achieved, particularly on F Si-DLC films. The F Si-DLC thin film provided a superior platform for diamond nucleation compared to O Si-DLC film, with a continuous diamond coverage up to -2 mm2.
DIAMOND AND RELATED MATERIALS
(2021)
Article
Chemistry, Physical
P. Pobedinskas, G. Degutis, W. Dexters, J. D'Haen, M. K. Van Bael, K. Haenen
Summary: By exposing tantalum thin films to different gas discharge plasmas, the surface wetting properties can be altered, and ultra-dispersed nanodiamond particles can be seeded using water-based colloidal seeding. The electrostatic interaction between the tantalum surface and the nanodiamond particles is the primary factor affecting the success of seeding, while the surface wetting properties play a lesser role in the process.
APPLIED SURFACE SCIENCE
(2021)
Article
Chemistry, Physical
Seohan Kim, Janghee Yoon, Sungmin Park, Joonho Bang, Pungkeun Song
Summary: The hydrogen-driven surface amorphization of crystalline In-Sn-O thin films allows for smooth surface morphology and tunability of the work function, leading to improved power conversion efficiency of thin-film solar cells. This method provides a facile way to realize smooth surface morphology of crystalline thin films for optoelectronic applications.
APPLIED SURFACE SCIENCE
(2021)
