Article
Chemistry, Physical
Helle-Mai Piirsoo, Taivo Jogiaas, Kaupo Kukli, Aile Tamm
Summary: The mechanical properties of nanodevices are greatly influenced by the mechanical properties of thin films. Amorphous Al2O3-Ta2O5 double and triple layers were deposited with various single-layer thicknesses. Annealing at different temperatures caused changes in the microstructure, resulting in the formation of different crystalline grains. The hardness and elastic modulus of the annealed laminates depended on the layer sequence, indicating the significant influence of the layered structure on the mechanical behavior.
Article
Crystallography
Ginka Exner, Aleksandar Grigorov, Elizabeth Ivanova, Peter Schunemann, Vladimir Tassev, Kevin Zawilski, Valentin Petrov
Summary: We investigated the nanohardness and Young's modulus of randomly oriented CdSiP2 (CSP) and ZnGeP2 (ZGP) single crystals grown by the horizontal Bridgman method. Nanoindentation using a Berkovich tip was employed in the continuous stiffness mode to determine the nanohardness values of CSP (9.9 +/- 0.2 GPa) and ZGP (11.5 +/- 0.1 GPa), as well as the Young's modulus values of CSP (136 +/- 2 GPa) and ZGP (150 +/- 2 GPa). The trends observed in hardness with bandgap and melting point for CSP and ZGP did not match previous measurements, but the results for ZGP showed good agreement with its binary isoelectronic analog, 2GaP.
Article
Engineering, Manufacturing
Bryan Lim, Keita Nomoto, Amy J. Clarke, Sudarsanam Suresh Babu, Sophie Primig, Xiaozhou Liao, Andrew J. Breen, Simon P. Ringer
Summary: Complex geometries and topology optimisations are driving the additive manufacturing of Ni-based superalloys, but there are thermal signature differences in complex components compared to commonly studied test coupons, leading to unaccounted microstructure-property variations. The effects of topological changes, such as engineered internal voids, on the mechanical performance of as-fabricated Haynes 282 monolith are investigated, revealing the influence of changing thermal conditions on the local mechanical property response.
ADDITIVE MANUFACTURING
(2023)
Article
Chemistry, Multidisciplinary
Taivo Jogiaas, Aivar Tarre, Hugo Maendar, Jekaterina Kozlova, Aile Tamm
Summary: In this study, Cr2O3 thin films with different structures were deposited using atomic layer deposition, and their phase composition, hardness, and other properties were measured. The results indicate that Cr2O3 could be a promising material as a mechanically protective thin film.
Review
Engineering, Electrical & Electronic
Nhat-Khuong Nguyen, Thanh Nguyen, Tuan-Khoa Nguyen, Sharda Yadav, Toan Dinh, Mostafa Kamal Masud, Pradip Singha, Thanh Nho Do, Matthew J. Barton, Hang Thu Ta, Navid Kashaninejad, Chin Hong Ooi, Nam-Trung Nguyen, Hoang-Phuong Phan
Summary: Wearable and implantable bioelectronics have made remarkable progress, but organic materials have limitations. Wide-band-gap materials are emerging as promising candidates for flexible electronics due to their excellent electrical and mechanical properties.
ACS APPLIED ELECTRONIC MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Mikk Kull, Helle-Mai Piirsoo, Aivar Tarre, Hugo Mandar, Aile Tamm, Taivo Jogiaas
Summary: In this study, HfO2 thin films doped with Al2O3 were deposited on silicon using PE-ALD, resulting in coatings with tunable refractive index and high mechanical resilience. The films were mainly amorphous with thicknesses of 60-80 nm and Al contents ranging from 2 to 26 at.%. The refractive indexes varied from 1.69 to 2.08 at 632 nm wavelength, and showed a strong correlation with the composition. The films exhibited hardness values of 12-15 GPa and modulus values of 160-180 GPa, with no clear correlation between mechanical properties and deposited compositions. The results suggest that thin films of HfO2 doped with Al2O3 can be used for mechanically resilient and optically tunable coatings in various applications.
Article
Chemistry, Inorganic & Nuclear
Roman G. Parkhomenko, Oreste De Luca, Lukasz Kolodziejczyk, Evgeny Modin, Petra Rudolf, Diego Martinez Martinez, Luis Cunha, Mato Knez
Summary: Amorphous AlN films obtained by atomic layer deposition exhibit compact and continuous structure with homogeneous composition, and their mechanical properties are comparable to those of AlN films produced by other techniques.
DALTON TRANSACTIONS
(2021)
Article
Nanoscience & Nanotechnology
Samreen Khan, Frank Angeles, John Wright, Saurabh Vishwakarma, Victor H. Ortiz, Erick Guzman, Fariborz Kargar, Alexander A. Balandin, David J. Smith, Debdeep Jena, H. Grace Xing, Richard Wilson
Summary: The study aims to investigate the impact of bulk vibrational properties and interfacial structure on thermal transport at interfaces in wide band gap semiconductor systems. The results suggest that thermal conductance depends on the bulk phonon properties of the softer material and the interfacial structure, rather than just the vibrational similarity between the two materials.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Multidisciplinary
Gianluigi De Falco, Fiorenzo Carbone, Mario Commodo, Patrizia Minutolo, Andrea D'Anna
Summary: This study conducted an experimental investigation on the nanomechanical properties of flame-formed carbonaceous particle layers using Atomic Force Microscopy (AFM) for the first time. The experimental procedure involved a combination of semi-contact and contact AFM imaging, as well as AFM force spectroscopy. Results discussed the hardness and Young's modulus values obtained from AFM measurements for different soot particle films.
APPLIED SCIENCES-BASEL
(2021)
Article
Materials Science, Multidisciplinary
Shalima Shawuti
Summary: The research aimed to compare oxide semiconductors as electrolyte materials for intermediate temperature solid oxide fuel cells. Among them, CoGa2O4 exhibited the highest ionic conductivity values in a specific grain size range.
MATERIALS TODAY COMMUNICATIONS
(2022)
Article
Materials Science, Coatings & Films
Tomas Plichta, Vaclav Sulc, Miloslav Ohlidal, Vladimir Cech
Summary: Amorphous hydrogenated silicon carbide (a-CSi:H) thin films were deposited using plasma-enhanced chemical vapor deposition with tetravinylsilane as precursor. The films exhibited improved mechanical properties, such as increased modulus of elasticity and hardness, with increasing power delivered to the plasma. The increase in energy led to greater fragmentation of the precursor and increased crosslinking of the material network. Minor changes in mechanical properties were observed over a 6-year aging period, but no significant changes in internal stress values were observed. These stable a-CSi:H films with low internal stress have a wide range of applications.
SURFACE & COATINGS TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Jinseok Kim, Junyoung Choi, Youngho Kang
Summary: Using first-principles calculations, alkaline earth tellurides MTe (M = Sr or Ba) are shown to be promising wide-band-gap semiconductors that can be ambipolarly doped and transparent to visible light. With large direct band gaps (3.74 eV for SrTe and 3.09 eV for BaTe), 100 nm thick MTe films exhibit significant transmittance (over 80%) for visible light. The effective mass of electrons and holes in MTe is predicted to be small (<1 m0), enabling high carrier mobilities.
CURRENT APPLIED PHYSICS
(2023)
Article
Chemistry, Physical
Matthew Barone, Michael Foody, Yaoqiao Hu, Jiaxin Sun, Bailey Frye, S. Sameera Perera, Biwas Subedi, Hanjong Paik, Jonathan Hollin, Myoungho Jeong, Kiyoung Lee, Charles H. Winter, Nikolas J. Podraza, Kyeongjae Cho, Adam Hock, Darrell G. Schlom
Summary: The study focuses on the synthesis and properties evaluation of Ta2SnO6, a potential p-type material. Despite the high hole mobility prediction, the direct epitaxial growth is hindered by the spontaneous formation of oxygen vacancies. Further studies using different synthesis techniques are needed.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Physics, Multidisciplinary
Zhenjiang Han, Han Liu, Quan Li, Dan Zhou, Jian Lv
Summary: The study found that the ideal strength of nanotwinned GaAs is 14% and 15% higher than that of single-crystal GaAs under pure and indentation shear strains, respectively, without negatively impacting its electronic performance. This increase in strength is attributed to the rearrangement of directional covalent bonds at the twin boundary.
CHINESE PHYSICS LETTERS
(2021)
Article
Chemistry, Physical
Hubert Grzywacz, Piotr Jenczyk, Michal Milczarek, Marcin Michalowski, Dariusz M. Jarzabek
Summary: This study used AFM-NI and OP model to analyze the mechanical properties of PMMA thin films, finding high sensitivity to experimental parameters with clear differences between thin and thick films. A simple parameter, the ratio of hardness to viscosity, was proposed for evaluating resist suitability for NIL, suggesting that thinner PMMA films are more suitable.
Article
Instruments & Instrumentation
Ashish Kumar, Ashutosh Patel, Saurabh Singh, Asokan Kandasami, D. Kanjilal
REVIEW OF SCIENTIFIC INSTRUMENTS
(2019)
Article
Physics, Applied
G. Maity, R. P. Yadav, R. Singhal, P. K. Kulriya, A. Mishra, T. Som, S. Dhar, D. Kanjilal, Shiv. P. Patel
Summary: The research investigates the morphology of crystalline Si surfaces in Al/amorphous-Si bilayer thin films under ion beam irradiation at 100 degrees C. It was found that the best crystallization is achieved at a specific ion fluence, and the hydrophobic nature of the surfaces decreases as ion fluence increases. These surfaces, with low reflectivity and hydrophobic properties, can potentially be used as photon absorber layers in advanced solar cell devices.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Physics, Applied
Anusmita Chakravorty, Budhi Singh, Hemant Jatav, Ramcharan Meena, D. Kanjilal, D. Kabiraj
Summary: Swift heavy ion irradiation can control the generation of defects in SiC, including VSi emitters and photo-absorbing centers, affecting the material's optical properties. Irradiation also induces specific optical changes, such as variations in the optical bandgap and suppression of Raman signals.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Physics, Applied
G. Maity, R. P. Yadav, R. Singhal, I. Sulania, A. K. Mittal, Dhirendra. K. Chaudhary, D. Kanjilal, Shiv. P. Patel
Summary: The study investigates the effects of film thickness on scaling law and surface properties of SnTe thin films. It is found that crystallinity of the films increases with thickness, and the thicker sample has a rougher surface. Fractal analysis reveals irregularity of surfaces, with parameters indicating quasi-3D island/mound growth type with rapid roughening behavior and anomalous scaling. The results suggest that thicker, higher crystalline films may be more suitable for advanced mid-infrared detector applications.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Materials Science, Ceramics
Vishal Kamathe, Rupali Nagar
Summary: This study reports a simple and novel technique to grow fractal structures with intricate geometries under lab environment. The fabricated fractals show excellent optoelectronic properties and have potential applications. The growth mechanism is discussed and the technique is shown to be versatile for growing other fractal and multi-dendritic structures.
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
(2022)
Review
Nanoscience & Nanotechnology
Vishal Kamathe, Rupali Nagar
Summary: This article provides a comprehensive review on inorganic fabricated fractals (fab-fracs) synthesized in labs and used as gas sensors. The focus is on investigating the morphology-driven gas response of these fab-fracs and identifying key parameters of fractal geometry influencing gas response. Fab-fracs with roughened microstructure, pore-network connectivity, and fractal dimension (D) less than 2 are projected to have better gas sensing capabilities.
BEILSTEIN JOURNAL OF NANOTECHNOLOGY
(2021)
Article
Physics, Applied
G. Maity, R. Singhal, S. Ojha, A. Mishra, U. B. Singh, T. Som, S. Dhar, D. Kanjilal, Shiv. P. Patel
Summary: This paper presents a novel technique for developing poly-crystalline Si thin films at room temperature using ion irradiation. The crystallization temperature is reduced through the process of aluminum-induced crystallization. The study shows that increasing ion fluence leads to higher crystallinity of Si.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Abha Mahajan, Vetrivel Sankar, Sundara Ramaprabhu, Rupali Nagar
Summary: This paper reports a rapid synthesis method for growing template-free three-dimensional hexagonal zinc oxide micro-rods using pulsed-microwave irradiation technique. The growth mechanism and optical properties of these structures were studied, and their potential applications as miniature sensors or in lasing applications were discussed.
MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS
(2022)
Review
Chemistry, Multidisciplinary
Josny Joy, Anand Krishnamoorthy, Ashish Tanna, Vishal Kamathe, Rupali Nagar, Sesha Srinivasan
Summary: This research paper focuses on the use of ball milled nanocomposite materials for energy storage applications. The review discusses the latest developments in synthesizing nanocomposites using a top-down approach and the related aspects of interfacial interactions. The use of milled nanocomposites in different structural applications is highlighted, as well as the effect of various parameters on their processability. The latter part of the review also discusses important advancements in the energy sector.
APPLIED SCIENCES-BASEL
(2022)
Article
Materials Science, Multidisciplinary
Damini Shivadas, Vishal Kamathe, Rupali Nagar
Summary: With the advancement in telecommunication technology, secure data transfer has become crucial. This study proposes the use of lab-grown fractals, rooted in Material Science, as a novel tool for data encryption.
MATERIALS ADVANCES
(2022)
Article
Materials Science, Multidisciplinary
Ravindra Singh Bisht, Sudipta Chatterjee, Sreyan Raha, Achintya Singha, D. Kabiraj, D. Kanjilal, A. K. Raychaudhuri
Summary: We demonstrate that controlled introduction of disorder through ion irradiation suppresses the metal-insulator transition in NdNiO3 films. The films exhibit a heavily disordered conductor governed by weak localization and an Anderson localized state at higher disorder. The experimental results show a suppression of the insulating state and a transition to a state of finite conductivity at low temperature in a disordered conductor. Similar behavior is also observed in La substituted NdNiO3 films irradiated with ion irradiation.
Article
Nanoscience & Nanotechnology
Sneha R. Prasad, Shivangi Srivastava, Rupali Nagar, Neeru Bhagat
Summary: With the increasing use of electronics, safe and effective energy storage devices have become a necessity. Supercapacitors, with their potential for maximum charge storage, compact size, economic feasibility, and faster charging rates, can contribute to sustainable development in the energy sector.
JOURNAL OF NANOSTRUCTURES
(2022)
Article
Materials Science, Multidisciplinary
Arun Kumar, Honey Mittal, Rupali Nagar, Manika Khanuja
Summary: In this study, a novel optimized nanocomposite was synthesized and its physiochemical properties were investigated. The addition of PANI nanofibers increased the surface area of the nanocomposite, leading to enhanced adsorption and photocatalytic degradation performance. The TCP50 nanocomposite exhibited excellent degradation efficiency for toxic textiles dyes.
MATERIALS ADVANCES
(2022)
Article
Nanoscience & Nanotechnology
Balaji Rakesh, Nipun Sharma, Rupali Nagar, Vipul Dhongade, Krishna Daware, Suresh Gosavi
Summary: This article discusses the importance of the type of interaction between a sensor and an analyte on sensor performance, and how response curves can be used to understand the mechanism of the sensing process.
ADVANCES IN NATURAL SCIENCES-NANOSCIENCE AND NANOTECHNOLOGY
(2021)
Article
Instruments & Instrumentation
Ram Swaroop, Narender Kumar, G. Rodrigues, D. Kanjilal, I Banerjee, S. K. Mahapatra
Summary: The project focuses on developing a compact ion implanter and plasma diagnostic facility based on a 2.45 GHz microwave ion source. Through the introduction of a four-step ridge waveguide, the microwave coupling to the ECR plasma cavity has been optimized. Simulations with different ions have shown the impact of accelerating voltages on beam emittance and output current.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2021)
