Article
Materials Science, Multidisciplinary
Jhonathan Castillo-Saenz, Nicola Nedev, Benjamin Valdez-Salas, Mario Curiel-Alvarez, Maria Isabel Mendivil-Palma, Norberto Hernandez-Como, Marcelo Martinez-Puente, David Mateos, Oscar Perez-Landeros, Eduardo Martinez-Guerra
Summary: Al2O3 layers with thicknesses ranging from 25 to 120 nm were successfully deposited by plasma enhanced atomic layer deposition at 70°C. The films exhibited high transmittance, close to stoichiometric composition, and good insulating properties, with films deposited using H2O as oxidant showing better I-V characteristics.
Article
Nanoscience & Nanotechnology
Mathias Franz, Mahnaz Safian Jouzdani, Lysann Kassner, Marcus Daniel, Frank Stahr, Stefan E. Schulz
Summary: The development of a low-temperature atomic layer deposition (ALD) process for metallic cobalt using a specific precursor and hydrogen plasma is presented. The ALD window for this process was determined to be between 50 and 110 degrees C, with a constant deposition rate of approximately 0.1 angstrom/cycle. The process showed a saturation behavior and resulted in a homogeneous coating of metallic cobalt at the wafer level. X-ray photoelectron spectroscopy measurements confirmed the formation of metallic cobalt.
BEILSTEIN JOURNAL OF NANOTECHNOLOGY
(2023)
Review
Materials Science, Multidisciplinary
James A. Oke, Tien-Chien Jen
Summary: Thin film technology aims to improve the properties of bulk materials and has been widely applied in various fields. Different deposition methods have different effects on film quality, and factors such as substrate, deposition temperature, and precursor choice are important. Atomic layer deposition (ALD) is a preferred technique for depositing ultra-thin films due to its simplicity and control over film composition and thickness.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Materials Science, Multidisciplinary
Tianzuo Fu, Lihua Zhou, Shuwen Meng, Yiqiang Zhong, Yiwu Chen, Qiang Yang, Yingxi Zhu, Tianfu Li, Xiaoyu Zou, Tinggui Yang
Summary: This study demonstrates the potential of atomic layer deposition (ALD) in reducing the surface oxidation of cerium (Ce), particularly with the use of ultra-thin films such as Al2O3, in short-term storage. The Al2O3 film grown by ALD shows the best antioxidation effect after 70 days of air exposure. This finding is important for the storage of actinide metals.
Article
Chemistry, Physical
Dingbo Chen, Xiao-Xi Li, Yu-Chun Li, Bo-Fang Peng, David Wei Zhang, Hong-Liang Lu
Summary: A multi-functional microwave annealing process was proposed for high-performance GaN heterostructure devices, resulting in a lower threshold voltage hysteresis, smaller gate leakage, and larger current output.
APPLIED SURFACE SCIENCE
(2021)
Article
Materials Science, Ceramics
Guangyu Dong, W. Li
Summary: Co-doped Al2O3 ceramics with Cu/Ti/Mg can effectively reduce the sintering temperature and achieve high density and uniform microstructure at 1150 degrees C, but higher temperature may lead to abnormal grain growth.
CERAMICS INTERNATIONAL
(2021)
Article
Chemistry, Physical
S. N. Kinnunen, K. Arstila, T. Sajavaara
Summary: This work investigated hydrogen and oxygen migration and exchange reactions in atomic layer deposited Al2O3 thin films, showing that films deposited at low temperatures can contain high hydrogen content but higher temperatures and longer purge lengths can decrease hydrogen and carbon concentrations significantly. Different isotopes of hydrogen and oxygen were used to track their movement in films, with findings indicating H-1/H-2 exchange reactions occur even at room temperature with high hydrogen concentrations while oxygen atoms do not notably migrate.
APPLIED SURFACE SCIENCE
(2021)
Article
Nanoscience & Nanotechnology
Tai Nguyen, Yves Fleming, Philipp Bender, Patrick Grysan, Nathalie Valle, Brahime El Adib, Noureddine Adjeroud, Didier Arl, Melanie Emo, Jaafar Ghanbaja, Andreas Michels, Jerome Polesel-Maris
Summary: This study investigates a strong magnetoelectric (ME) effect in thin-film composites of nickel, iron, or cobalt foils with AlN films grown by PE-ALD, revealing intricate interface structures and crystalline characteristics. The research also discusses the magnetoelectric responses and power generation potential of these composites, highlighting the importance of interface analysis in understanding their performance.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Optics
B. Can-Uc, R. Rangel-Rojo, E. G. Lizarraga-Medina, J. A. Jurado-Gonzalez, H. Tiznado
Summary: The linear and nonlinear optical properties of nanocomposites consisting of multiple Al2O3/Y2O3 bilayers were studied in this work. Different thicknesses of Y2O3 layers were fabricated while keeping the Al2O3 layer thickness constant. The samples were characterized using optical ellipsometry, transmission electron microscopy, and XRD. The third-order nonlinear optical properties were investigated using the z-scan technique, and figures of merit for potential optical processing applications were calculated and analyzed.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Chemistry, Physical
Chuanju Wang, Feras AlQatari, Vishal Khandelwal, Rongyu Lin, Xiaohang Li
Summary: The origin of interfacial charges in Al2O3/Si and Al2O3/GaN was studied, and it was found that the chemical stoichiometry deviations at the interfaces caused the different interfacial charges.
APPLIED SURFACE SCIENCE
(2023)
Article
Crystallography
Shinyoung Park, Sangwook Youn, Jun Tae Jang, Hyungjin Kim, Dae Hwan Kim
Summary: This paper discusses the correlation between SiO2 deposition thickness and hydrogen content, and analyzes the effect of the SiO2 layer on the properties of synaptic IGZO TFTs. The results show that the SiO2 layer improves the memory window and retention characteristics, and provides guidance for optimizing the hydrogen content.
Article
Chemistry, Physical
Tahereh G. Avval, Stanislav Prusa, Cody Cushman, Grant T. Hodges, Sarah Fearn, Seong H. Kim, Jan Cechal, Elena Vanickova, Pavel Babik, Tomas Sikola, Hidde H. Brongersma, Matthew R. Linford
Summary: This article presents a tag-and-count approach for determining surface silanol densities on glass surfaces. The method involves tagging surface silanols with zinc via atomic layer deposition (ALD) and detecting the zinc using high sensitivity-low energy ion scattering (HS-LEIS). Experimental results are consistent with literature values.
APPLIED SURFACE SCIENCE
(2023)
Article
Engineering, Electrical & Electronic
Nila Pal, Utkarsh Pandey, Sajal Biring, Bhola N. Pal
Summary: A top-contact bottom-gated SnO2 thin-film transistor (TFT) has been successfully fabricated using a TiO2/Li-Al2O3 bilayer stacked gate dielectric, with an operating voltage within 2.0 V. The bilayer dielectric shows higher areal capacitance and lower leakage current density, significantly improving the overall device performance of the TFT. Compared to TFTs with a single layer Li-Al2O3 gate dielectric, the TFT with the bilayer gate dielectric exhibits higher effective carrier mobility and on/off ratio.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2022)
Article
Engineering, Electrical & Electronic
J. R. Castillo-Saenz, N. Nedev, E. Martinez-Guerra, B. Valdez-Salas, M. I. Mendivil-Palma, M. A. Curiel-Alvarez, M. Aleman, M. Lopez-Castillo, J. L. Hernandez-Lopez, P. G. Toledo-Guizar, N. Hernandez-Como
Summary: Thin film transistors (TFT) were fabricated using plasma-enhanced atomic layer deposition (PE-ALD) technique at 70 degrees C on glass substrates. The fabricated transistors showed good electrical characteristics.
MICROELECTRONIC ENGINEERING
(2022)
Article
Physics, Multidisciplinary
Yu Fu, Rui-Min Xu, Xin-Xin Yu, Jian-Jun Zhou, Yue-Chan Kong, Tang-Sheng Chen, Bo Yan, Yan-Rong Li, Zheng-Qiang Ma, Yue-Hang Xu
Summary: The study investigates the fixed charges and interface trap states in C-H diamond MOSFETs using different gate dielectric processes. The results show that positive and negative fixed charges are present in Al2O3 films deposited at 80 degrees C and 300 degrees C, while shallow interface traps of different densities are found at the Al2O3/C-H diamond interface for different deposition conditions. Dynamic pulsed I-V and capacitance dispersion results indicate that ALD Al2O3 technique with 300 degrees C deposition temperature has higher stability for C-H diamond MOSFETs.
Review
Energy & Fuels
Muhammad Iqbal, Malik Muhammad Nauman, Farid Ullah Khan, Pg Emeroylariffion Abas, Quentin Cheok, Asif Iqbal, Brahim Aissa
Summary: The review summarizes recent developments in vibration-based energy harvesters (VEHs) with a focus on piezoelectric, electromagnetic, and hybrid piezoelectric-electromagnetic energy harvesters. Various vibration and motion-induced energy harvesting prototypes have been discussed in detail. Piezoelectric energy harvesters are typically in the millimeter to centimeter scales with resonant frequencies ranging from 2-13 900 Hz, while electromagnetic energy harvesters can potentially reach up to 778.01 mu W/cm(3). Hybrid energy harvesters (HEHs) show the highest power densities due to combined piezoelectric-electromagnetic energy conversion, ranging from 35.43-4900 mu W.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2021)
Article
Engineering, Electrical & Electronic
Imran Shah, Shahid Aziz, Afaque Manzoor Soomro, Kyunghwan Kim, Soo Wan Kim, Kyung Hyun Choi
Summary: The paper introduces three novel designs of micromixers for evaluating mixing performance in biodiesel preparation. The YCSMSAR micromixer demonstrates the best mixing efficiency at a Reynolds number of 100, with a mixing index of 99.9%.
MICROSYSTEM TECHNOLOGIES-MICRO-AND NANOSYSTEMS-INFORMATION STORAGE AND PROCESSING SYSTEMS
(2021)
Article
Engineering, Electrical & Electronic
Muhammad Shakeel, Khalid Rehman, Salman Ahmad, Kyung-Hyun Choi, Arshad Khan
Summary: Thermocouples are widely used for temperature measurement due to their reliability, with this research focusing on the fabrication of thermocouples using carbon and PEDOT: PSS materials to explore their performance. The study found that different materials have similar Seebeck coefficients, and the coefficient is not only material-dependent but also influenced by the electrical properties of the thermocouples.
IEEE SENSORS JOURNAL
(2021)
Article
Energy & Fuels
Muhammad Waqas, Afaque Manzoor Soomro, Shamshad Ali, Hina Ashraf, Abdul Sattar Chan, Suresh Kumar, Kyung Hyun Choi
Summary: The highly efficient microporous composite separator based on PVDF-HFP and C-La2O3 shows enhanced mechano-thermal stability and improved conductivity of lithium ions. It exhibits high wettability, electrolyte uptake, and ionic conductivity for high-temperature lithium-ion batteries.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2021)
Article
Nanoscience & Nanotechnology
Hafiz Muhammad Umer Farooqi, Bohye Kang, Muhammad Asad Ullah Khalid, Abdul Rahim Chethikkattuveli Salih, Kinam Hyun, Sung Hyuk Park, Dongeun Huh, Kyung Hyun Choi
Summary: Hepatic fibrosis is a warning sign for future adverse events like liver cirrhosis, liver failure, and cancer, mainly caused by hepatic stellate cell activation leading to excessive extracellular matrix deposition and hepatic parenchyma disintegration. In a dynamic cell culture microphysiological system, measuring trans-epithelial electrical resistance (TEER) can be used to monitor fibrosis development effectively, serving as a potential substitute for conventional assays.
Article
Chemistry, Multidisciplinary
Arun Asif, Sung Hyuk Park, Afaque Manzoor Soomro, Muhammad Asad Ullah Khalid, Abdul Rahim Chattikatikatuveli Salih, Bohye Kang, Faheem Ahmed, Kyung Hwan Kim, Kyung Hyun Choi
Summary: In the field of microfluidics, microphysiological systems (MPS) are addressing the challenge of physiological relevance in drug discovery and development by integrating a microfluidic albumin immunosensor with liver-on-a-chip MPS.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2021)
Article
Polymer Science
Abdul Rahim Chethikkattuveli Salih, Kinam Hyun, Arun Asif, Afaque Manzoor Soomro, Hafiz Muhammad Umer Farooqi, Young Su Kim, Kyung Hwan Kim, Jae Wook Lee, Dongeun Huh, Kyung Hyun Choi
Summary: Cellular microenvironment is crucial for tissue growth patterns and can be influenced by ECM. Hepatic microphysiological systems emulate human liver physiology for drug screening, and standardized ECM coatings on microfluidic devices may enhance organ-specific emulation. Optimizing surface coatings of different ECM types can improve tissue development, with image processing and TEER sensors assisting in tissue analysis.
Article
Plant Sciences
Farzana Kausar, Kyung-Hwan Kim, Hafiz Muhammad Umer Farooqi, Muhammad Awais Farooqi, Muhammad Kaleem, Rooma Waqar, Atif Ali Khan Khalil, Fazli Khuda, Chethikkattuveli Salih Abdul Rahim, Kinam Hyun, Kyung-Hyun Choi, Abdul Samad Mumtaz
Summary: This study investigated the anticancer and antimicrobial activities of Prunus cornuta and Quercus semicarpifolia. The results showed significant inhibitory effects on various cancer cell lines and antibacterial effects against different strains.
Article
Biology
Hafiz Muhammad Umer Farooqi, Anupamma Sammantasinghar, Farzana Kausar, Muhammad Awais Farooqi, Abdul Rahim Chethikkattuveli Salih, Kinam Hyun, Jong-Hwan Lim, Atif Ali Khan Khalil, Abdul Samad Mumtaz, Kyung Hyun Choi
Summary: This study assessed the anticancer activity of plant extracts using a liver tumor microphysiological system. The results demonstrated that the liver tumor microphysiological system showed better anticancer activity compared to traditional cell culture models. It allowed real-time observation of the anticancer effects of plant extracts and provided clues for future molecular research on anticancer pathways.
Article
Engineering, Chemical
Asif Iqbal, Guolong Zhao, Quentin Cheok, Ning He, Malik M. Nauman
Summary: Tool life criterion based on work surface roughness can extend tool life and make the machining process more sustainable.
Review
Materials Science, Multidisciplinary
Zulfikre Esa, Muhammad Abid, Juliana Hj Zaini, Brahim Aissa, Malik Muhammad Nauman
Summary: Electrohydrodynamic (EHD) printing is an ultra-high-resolution additive manufacturing technique that offers cost-effective and material-efficient direct-writing process without the need for vacuum or contact. It has advantages in terms of aspect ratio, performance improvement, and ink materials flexibility compared to other manufacturing techniques. EHD printing is used for fabricating micro and nanoelectronic devices and can operate in drop-on-demand or continuous jet printing styles for patterning and deposition of materials.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2022)
Article
Chemistry, Physical
Muhammad Nihal Naseer, Khurram Kamal, Muhammad Abid, Asif Iqbal, Hamdullah Khan, Ch. Muhammad Zubair, Sagar Kumar, Tahir Abdul Hussain Ratlamwala, Malik Muhammad Nauman
Summary: Energy production from clean and green sources is a major challenge. The integration of fuel cells and biogas offers a promising solution to reduce CO2 emissions. This study contributes by developing a self-sustaining biogas-fuel cell system for cold areas.
INTERNATIONAL JOURNAL OF PHOTOENERGY
(2022)
Article
Biochemistry & Molecular Biology
Faheeda Soomro, Fida Hussain Memon, Muhammad Ali Khan, Muzaffar Iqbal, Aliya Ibrar, Ayaz Ali Memon, Jong Hwan Lim, Kyung Hyon Choi, Khalid Hussain Thebo
Summary: An easy and efficient method was used to fabricate MoO2@GO and WO3@GO nanocomposite membranes with controlled structure and interlayer spacing. These membranes showed good separation for salt and heavy metal ions due to intensive stacking interaction and electrostatic attraction. They exhibited high rejection rates (>70%) for small metal ions such as sodium (Na+) and magnesium (Mg2+) ions, as well as >99% rejection rates for nickel (Ni2+) and lead (Pb2+) ions, with good water permeability of 275 +/- 10 L m(-2) h(-1) bar(-1). We believe that these fabricated membranes have a bright future in next generation desalination and water purification membranes.
Article
Biochemistry & Molecular Biology
Imtiaz Ali Soomro, Fida Hussain Memon, Waqas Mughal, Muhammad Ali Khan, Wajid Ali, Yong Liu, Kyung Hyun Choi, Khalid Hussain Thebo
Summary: In this study, a three-dimensional computational fluid dynamic model was developed based on published literature data to investigate the impact of temperature and pressure on the performance of proton exchange membrane fuel cells. The results showed that the performance of the fuel cell can be enhanced by adjusting the temperature and operating pressure. It was also found that an increase in temperature leads to a decrease in current density, while fully humidified gas channels and higher reference current density values can improve current density.
Article
Energy & Fuels
Quentin Cheok, Nurul Hafizan Husaini, Malik Muhammad Nauman
Summary: Personal transportation is prevalent in Brunei due to inadequate public transportation, but the effects of climate change cannot be ignored. This study found that electric vehicles have higher total cost of ownership compared to internal combustion engine vehicles, but are comparable to European premium brands.
