Article
Multidisciplinary Sciences
Abraham Ogwu, T. H. Darma
Summary: In this study, the Hamaker constant of copper oxide thin films was calculated using the Lifshitz theory and TWA method, and the influence of surface roughness on surface energy was determined. The dominance of the Cu2O phase and London dispersion force on the surface of the films was confirmed through FTIR Cu(I)-O vibrational mode observation and XPS Cu 2p(3/2) binding energy peak.
SCIENTIFIC REPORTS
(2021)
Article
Physics, Multidisciplinary
Krishn Pal Singh, Sudeep Bhattacharjee
Summary: This article investigates the irradiation effects of low energy Argon ion beams on the optical constants of copper, silver, and aluminum metallic thin films. It shows that with increasing ion fluence, the optical constants and optical conductivity of the films decrease while the skin depth increases.
FRONTIERS IN PHYSICS
(2021)
Article
Physics, Applied
Changyu Deng, Bogdan Epureanu, Bogdan-Ioan Popa, Wei Lu
Summary: Determining the effective conductivity of heterogeneous media is essential and challenging. This research derives the analytical form of the effective conductivity as a function of frequency caused by heterogeneity, and validates it using simulation and experiment data. The results show that this model has better agreement with the data than other models, and provides practical guidance on the interpretation and application of impedance and conductivity data.
APPLIED PHYSICS LETTERS
(2023)
Article
Chemistry, Physical
Juan Luengo-Marquez, Luis G. MacDowell
Summary: This study investigates the adsorption behavior near three-phase coexistence and analyzes the formation of wetting films from the perspective of intermolecular forces. Competition between ice and water layers for adsorption of water vapor on Silver Iodide surface is observed, with surface forces promoting ice growth, supporting a contact nucleation mode in the atmosphere. This approach provides a framework for understanding adsorption at three-phase coexistence and allows for studying ice nucleation efficiency on atmospheric aerosols.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2021)
Article
Chemistry, Multidisciplinary
Zhen-Hao Li, Tsung-Che Chiang, Po-Yi Kuo, Chun-Hao Tu, Yue Kuo, Po-Tsun Liu
Summary: The authors propose a novel vertically-stacked thin film transistor (TFT) architecture for heterogeneously complementary inverter applications, which consists of p-channel polycrystalline silicon (poly-Si) and n-channel amorphous indium tungsten oxide (a-IWO) with a smaller footprint than a planar structure. The electrical characteristics of the a-IWO TFT, including high mobility, low leakage current, and high on/off current ratio, make it well-suited for complementary metal-oxide-semiconductor technology applications. The vertically-stacked complementary field-effect transistors (CFET) exhibit high energy-efficiency and can increase the circuit density in a chip for next-generation semiconductor technology development.
Article
Physics, Particles & Fields
Simran Arora, Abhishek Parida, P. K. Sahoo
Summary: New high-precision observations allow for constraining different gravity theories, with the investigation of the accelerated expansion of the Universe using the newly proposed f(Q,T) gravity theory. By constraining the model with observational data, the study found the best fitting values for the parameters, supporting the feasibility of f(Q,T) as a promising theory of gravity.
EUROPEAN PHYSICAL JOURNAL C
(2021)
Article
Physics, Multidisciplinary
Jayashree Majumdar, Sudeep Bhattacharjee
Summary: The study reports the formation of self-organized microconical arrays on copper surface exposed to high flux of argon ion beams, and explores their field emission properties. The surface morphologies, local work function variation, and argon content in the irradiated layer are investigated to understand the evolution of microstructures. The enhancement in field emission properties of the irradiated copper substrates is observed, with a parametric model considered to explain the experimental results on field enhancement factor and emission current.
FRONTIERS IN PHYSICS
(2021)
Article
Physics, Applied
Jayashree Majumdar, Sudeep Bhattacharjee
Summary: A comparative study was conducted on the emission properties of atomically heterogeneous conical arrays irradiated with argon and krypton ions, revealing that krypton ion irradiation led to better generation of naturally selected arrays of field emitters.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Mechanics
Yujuan Chen, Xianmin Xu
Summary: Theoretical study on the self-propulsion dynamics of a small droplet on general curved surfaces leads to a new reduced model that quantitatively describes the motion of droplets. The model includes a scaling law for droplet displacement with respect to time on the outside surface of a cone. The theoretical results are in good agreement with experimental data without adjusting the friction coefficient in the model.
Article
Chemistry, Physical
Kishu Sugawara, Insung Seo, Shiro Yamazaki, Kan Nakatsuji, Yoshihiro Gohda, Hiroyuki Hirayama
Summary: The crystallized wetting layer beneath the Ag(111) islands on the Si(111)7 x 7 substrate was found to contribute to the formation of quantum-well states (QWSs). Compared to Ag islands nucleated directly on the substrate, the presence of a wetting layer caused a shift of one monolayer in the E-w relation.
Article
Physics, Particles & Fields
Alvaro S. de Jesus, Nelson Pinto-Neto, Farinaldo S. Queiroz, Joseph Silk, Deivid R. da Silva
Summary: The Hubble constant derived from the 6-parameter fit to the CMB power spectrum contradicts the value obtained from direct measurements via type Ia supernova and Cepheids observations. We propose a mechanism involving effective operators that produce relativistic dark matter particles at early times, increasing the number of relativistic degrees of freedom. This mechanism can raise the value of the Hubble constant derived from CMB and reconcile discrepancies between local and CMB probes. By itself, it can increase H-0 up to 70 km s(-1) Mpc(-1), and with the addition of a Phantom-like cosmology, reach H-0 ? 71-73 km s(-1)Mpc(-1). We also outline the parameter space that reproduces H-0? 71-73 km s(-1) Mpc(-1) while satisfying all relevant constraints.
EUROPEAN PHYSICAL JOURNAL C
(2023)
Article
Materials Science, Multidisciplinary
L. Afferrante, G. Violano
Summary: The study developed a comprehensive deterministic model describing the adhesive interactions of a rigid sphere in contact with a viscoelastic half-space, finding that the effective surface energy increases with the contact line velocity in loading-unloading cycles under different driving conditions.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2022)
Article
Chemistry, Physical
Genhao Liang, Long Cheng, Junkun Zha, Hui Cao, Jingxian Zhang, Qixin Liu, Mingrui Bao, Jia Liu, Xiaofang Zhai
Summary: This work introduces an in-situ technique for quantifying layer-by-layer roughness of thin films and heterostructures by measuring RHEED spectral profiles. The experiments demonstrate significantly improved synthesis efficiency for achieving atomically smooth surfaces and interfaces.
Article
Radiology, Nuclear Medicine & Medical Imaging
H. Cook, J. Lambert, R. Thomas, H. Palmans, M. Hussein, C. H. Clark, G. Royle, J. Pettingell, A. Lourenco
Summary: This study investigates the development of a bespoke Range Length Phantom (RaLPh) for independent determination of proton range in tissue. The phantom was tested with different configurations of tissue substitute slabs and was found to provide measurable range differences. Results were validated using Monte Carlo simulations and ionisation chamber measurements. The phantom was assessed as an audit device, but further improvements, such as material density override, are required for it to be effective.
PHYSICA MEDICA-EUROPEAN JOURNAL OF MEDICAL PHYSICS
(2022)
Article
Geochemistry & Geophysics
Yinfei Liao, Xingwei Song, Maoyan An, Zhe Yang, Xiaodong Hao, Hourui Ren
Summary: The study investigated the effect of a mixed collector on wetting film evolution, showing that the mixed collector reduced induction time and increased zeta potential, resulting in the strongest hydrophobic interaction between bubbles and coal particles treated by the mixed collector.
Article
Optics
Krishn Pal Singh, Jayashree Majumdar, Sudeep Bhattacharjee
Article
Physics, Multidisciplinary
Sayak Bhattacharjee, Anuj Ram Baitha, Jose Mathew, Sudeep Bhattacharjee
Summary: This study characterizes spatially varying optical emissions in a compact dipole plasma device driven by continuous mode microwaves. Two optical diagnostic techniques are employed to determine the local emissivities, and the existence of two bright belts separated by a darker band in the dipole plasma is confirmed by both the experimental and modeling results.
Article
Physics, Multidisciplinary
Jayashree Majumdar, Sudeep Bhattacharjee
Summary: The study reports the formation of self-organized microconical arrays on copper surface exposed to high flux of argon ion beams, and explores their field emission properties. The surface morphologies, local work function variation, and argon content in the irradiated layer are investigated to understand the evolution of microstructures. The enhancement in field emission properties of the irradiated copper substrates is observed, with a parametric model considered to explain the experimental results on field enhancement factor and emission current.
FRONTIERS IN PHYSICS
(2021)
Article
Physics, Multidisciplinary
Krishn Pal Singh, Sudeep Bhattacharjee
Summary: This article investigates the irradiation effects of low energy Argon ion beams on the optical constants of copper, silver, and aluminum metallic thin films. It shows that with increasing ion fluence, the optical constants and optical conductivity of the films decrease while the skin depth increases.
FRONTIERS IN PHYSICS
(2021)
Article
Physics, Fluids & Plasmas
Kalyani Barman, Mohit Mudgal, Ramkrishna Rane, Sudeep Bhattacharjee
Summary: The use of magnetic field impacts the dynamics of charged particles, plasma constituents, and optical emissions in a cold atmospheric pressure micro-plasma jet. Experiments show that externally applied transverse magnetic field affects optical emissions and particle behavior inside the plasma. The presence of reactive species important for biomedical applications is identified, and their behavior under the influence of magnetic field is investigated.
PHYSICS OF PLASMAS
(2021)
Article
Materials Science, Multidisciplinary
Dipak Bhowmik, Sudeep Bhattacharjee
Summary: This article investigates the modification of optical, structural, and electrical properties of indium-tin-oxide (ITO) thin films through argon ion implantation. The optical transmission is enhanced with increasing ion doses, and the optical bandgap can be tailored. Ion implantation also affects the crystal structure and element concentration. The electrical properties of ion-implanted ITO films can be tuned, and theoretical simulation supports the experimental observations.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2022)
Article
Physics, Applied
Sushanta Barman, Sudeep Bhattacharjee
Summary: A numerical simulation of a two-dimensional Gaussian wave packet of charged particles has been performed to investigate the diffraction phenomena from a single-, double-, and multi-slit grating biased with an electrostatic potential. The effect of the potential on transmission properties, fringe pattern, motion of the peaks, and wave number distribution in the diffracted wave has been studied.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Physics, Fluids & Plasmas
Ayesha Nanda, Sudeep Bhattacharjee
Summary: This study presents a generalization of electrical conductivity in a plasma confined in a dipole magnetic field with temperature anisotropy. The anisotropy influenced by the magnetic field distribution is found to be significant in the strong field region, affecting the Pedersen and longitudinal conductivity of electrons more than the Hall conductivity, while the effect of temperature anisotropy on Hall conductivity can be observed in ions. The research reveals new features in the conductivity tensor due to temperature anisotropy and the bidirectional nature of the dipole field, which contributes to a better understanding of electrical conduction in both laboratory and space dipole plasmas.
PHYSICS OF PLASMAS
(2022)
Article
Physics, Applied
Jayashree Majumdar, Sudeep Bhattacharjee
Summary: A comparative study was conducted on the emission properties of atomically heterogeneous conical arrays irradiated with argon and krypton ions, revealing that krypton ion irradiation led to better generation of naturally selected arrays of field emitters.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Physics, Applied
Kalyani Barman, Sunil Luhar, Ramkrishna Rane, Divesh N. Srivastava, Sudhir K. Nema, Sudeep Bhattacharjee
Summary: Screen-printed carbon electrode (SPCE) is widely used in biosensors. Surface modification of SPCE with argon atmospheric pressure plasma jet (APPJ) can remove binders, oxidize the surface, enhance hydrophilicity, and improve sensitivity for dopamine adsorption.
PLASMA PROCESSES AND POLYMERS
(2023)
Article
Physics, Fluids & Plasmas
Ayesha Nanda, Sudeep Bhattacharjee
Summary: This article presents current density profiles in a plasma confined by a dipole magnet, considering the effects of Lorentz and hydrodynamic forces, spatially varying plasma parameters, electrostatic field, and microwave electric field. It is found that the DC density is dominated by hydrodynamic force, while the AC density is dominated by the Lorentz force. The results also reveal the role of bounce motion, magnetic drifts, and anisotropic pressure tensor in controlling the current flow.
PHYSICS OF PLASMAS
(2023)
Article
Physics, Fluids & Plasmas
Sargam Hunjan, Sudeep Bhattacharjee
Summary: This study investigated the electron energy distribution function (EEDF) in a plasma driven and confined by a single permanent dipole magnet using electron cyclotron resonance heating. The results showed that the plasma was Maxwellian in most of the available space, and electrons had higher average energy in the direction parallel to the magnetic field. Energetic electron rich regions were found at specific locations, and process rates such as electron neutral collisions and ionization showed anisotropic variation in the polar plane of the dipole plasma.
PLASMA SOURCES SCIENCE & TECHNOLOGY
(2023)
Article
Physics, Fluids & Plasmas
Deepika Behmani, Sudeep Bhattacharjee
Summary: The interaction between a cold atmospheric pressure micro-plasma jet and different types of substrates with varying electrical permittivity is experimentally investigated. The results show that high permittivity substrates exhibit a return stroke phenomenon, while low permittivity substrates generate a surface ionization wave. The conductivity of the substrate affects the substrate current. The interaction also affects the gas temperature and electron density, but has minimal impact on the electron excitation temperature. The frequency of electric field fluctuations is higher for low permittivity substrates.
PHYSICS OF PLASMAS
(2023)
Article
Optics
Krishn Pal Singh, Sudeep Bhattacharjee
Summary: The stability and surface characteristics of aluminum and silver metallic thin films under helium ion bombardment were investigated to replicate the effect of alpha particle bombardment on spacecrafts and satellites in a space environment. The study found that helium ion implantation had a reasonably low degradation effect on the reflectivity of the films, suggesting their potential use for protecting optical components in spacecrafts.
Article
Nanoscience & Nanotechnology
Deepika Behmani, Kalyani Barman, Sudeep Bhattacharjee
Summary: Experimental investigation was carried out on fluctuations in plasma floating potential in an atmospheric pressure micro-plasma jet, showing that fluctuations increase with higher applied voltage or gas flow rate. The gas mixture ratio also influences the level of fluctuations.
Article
Chemistry, Physical
Qi-Wen Chen, Ze-Qing Guo, Jian-Ping Zhou
Summary: Multifunctional continuous solid solutions NFMTO-x were successfully synthesized via a one-step hydrothermal method by controlling the ratio of Mg and Fe. The NFMTO-x materials exhibited enhanced visible light response, effective adsorption and photocatalytic degradation of organic pollutants, CO2 methanation capability, and easy recyclability due to their magnetic properties. This research provides a significant multifunctional material for water purification.
APPLIED SURFACE SCIENCE
(2024)
Review
Chemistry, Physical
George E. Stan, Maziar Montazerian, Adam Shearer, Bryan W. Stuart, Francesco Baino, John C. Mauro, Jose M. F. Ferreira
Summary: Bioactive glasses have the ability to form strong bonds with tissues and release therapeutic ions. However, their biomechanical compatibility limits their use in load-bearing applications. The use of magnetron sputtering technology to fabricate BG coatings shows promise in improving their efficacy and potential for application.
APPLIED SURFACE SCIENCE
(2024)
Article
Chemistry, Physical
Zhaoxuan Wang, Zhicheng Yan, Zhigang Qi, Yu Feng, Qi Chen, Ziqi Song, Meng Huang, Peng Jia, Ki Buem Kim, Weimin Wang
Summary: The corrosion behavior of Fe-60 and Fe-83 ribbons in 0.6 M NaCl was studied. Fe-60 exhibited a local corrosion mode and formed a stable passivation film with higher corrosion resistance, while Fe-83 showed a combination of local and global corrosion modes and had lower corrosion resistance. Controlling the precipitation of nanocrystalline phases and increasing the POx content in the passivation film significantly improved the corrosion resistance of Fe-based glassy alloys.
APPLIED SURFACE SCIENCE
(2024)
Article
Chemistry, Physical
Hao-Kai Peng, Sheng-Yen Zheng, Wei-Ning Kao, Ting-Chieh Lai, Kai-Sheun Lee, Yung- Hsien Wu
Summary: This study investigates the effects of high energy/fluence proton radiation on the performance of HfZrOx-based FeFETs memory with different Zr content. The results show that the characteristics of FeFETs are influenced by proton radiation, and the extent of the influence depends on the Zr content. FeFETs with 50% Zr content exhibit minimal changes in memory window and demonstrate good endurance and retention performance.
APPLIED SURFACE SCIENCE
(2024)
Article
Chemistry, Physical
Zongyi Yue, Guangyi Wang, Zengguang Huang, Sihua Zhong
Summary: In this study, AZO and ITO films were successfully tuned as excellent passivation layers for c-Si surfaces, achieving effective minority carrier lifetime and outstanding optical properties through the optimization of annealing temperature and interfacial silicon oxide.
APPLIED SURFACE SCIENCE
(2024)
Article
Chemistry, Physical
Martin Hruska, Jan Kejzlar, Jaroslav Otta, Premysl Fitl, Michal Novotny, Jakub Cizek, Oksana Melikhova, Matej Micusik, Peter Machata, Martin Vrnata
Summary: This paper presents a detailed study on the hydrogen sensing capabilities of highly nanoporous black gold films. The films exhibit fast response and recovery times at low temperatures. Different levels of nanoporosity were prepared and tested to investigate the sensing properties, and it was found that nanoporous black gold is suitable for hydrogen sensing. The sensitivity of the film depends on its nanoporosity.
APPLIED SURFACE SCIENCE
(2024)
Article
Chemistry, Physical
Yupu Wang, Gaofeng Teng, Chun To Yiu, Junyi Zhu
Summary: In the study of BM-SCO and HSCO thin films, it was found that H vacancies tend to prefer sites near the external surface or oxygen vacancy channels (OVCs), while H interstitials prefer sites of oxygen on a layer that contains six-fold coordinated Co. These findings not only enrich the understanding of complex surface phenomena of defect formation but also provide an explanation for the reversibility during phase transformation.
APPLIED SURFACE SCIENCE
(2024)
Article
Chemistry, Physical
Jiafeng Lu, Linping Teng, Qinxiao Zhai, Chunhua Wang, Matthieu Lancry, Ye Dai, Xianglong Zeng
Summary: In this study, we achieved full control of fiber nanograting orientation by manipulating laser polarization, and tailored space variant fiber nanogratings, which expanded the diversity in fiber nanograting engineering.
APPLIED SURFACE SCIENCE
(2024)
Article
Chemistry, Physical
Yibo Liu, Yujie Tao, Yue Liu, Qi Sun, Qinrong Lin, Kexin Kang, Qinghua Zhang, Qingjie Sun
Summary: This study investigates the wettability of the Ti-Cu-Fe multi-metal system, specifically the wetting behaviors of CuSi3 droplets on TC4 and 304SS plates. The results show that the CO2 + Ar gas atmosphere significantly affects interfacial mass transfer, thus influencing the wettability of the systems.
APPLIED SURFACE SCIENCE
(2024)
Article
Chemistry, Physical
Jimei Liu, Fei Wang, Rong Guo, Yuqi Liu, Mengyu Zhang, Jaka Sunarso, Dong Liu
Summary: This study developed Co/MXene composites with anti-corrosion properties by varying the cobalt content. These composites exhibited remarkable electromagnetic absorption performance and high resistance to corrosion under various corrosive conditions. The study also revealed the mechanism of electron transfer from cobalt to MXene and the electromagnetic dissipation behavior originated from polarization loss alone.
APPLIED SURFACE SCIENCE
(2024)
Article
Chemistry, Physical
Moujie Huang, Yongsong Ma, Jingbo Yang, Lingyun Xu, Hangqi Yang, Miao Wang, Xin Ma, Xin Xia, Junhao Yang, Deli Wang, Chuang Peng
Summary: Strong metal-support interactions (SMSIs) are important for enhancing catalytic activities and stability in thermal catalysis. This study demonstrates a method to create SMSIs in electrocatalysis using carbon nanotubes and Ru nanoparticles, resulting in excellent catalytic activity and stability.
APPLIED SURFACE SCIENCE
(2024)
Article
Chemistry, Physical
Ravi Trivedi, Brinti Mondal, Nandini Garg, Brahmananda Chakraborty
Summary: This study explores the potential of biphenylene as a nanocarrier for the delivery of the anticancer drug cisplatin. It is found that biphenylene offers physical stability, rapid release rate, solubility, and bio-compatibilities compared to other nanocarriers. The adsorption of cisplatin on the surface of biphenylene involves charge transfer from cisplatin to biphenylene. The drug is shown to be released at body temperature in an acidic environment. Biphenylene also exhibits excellent cytotoxicity activity and cellular uptake of the drug. Overall, biphenylene shows promise as a potential nanocarrier for cisplatin delivery.
APPLIED SURFACE SCIENCE
(2024)
Article
Chemistry, Physical
Hyun Jeong, Hyeong Chan Suh, Ga Hyun Cho, Rafael Salas-Montiel, Hayoung Ko, Ki Kang Kim, Mun Seok Jeong
Summary: In this study, a potential platform to enhance Raman scattering and increase the number of observable Raman modes in monolayer transition metal dichalcogenides (TMDs) was proposed. The platform consisted of large-scale arrays of gold micropillars (MPs), which were able to enhance the Raman intensity of TMDs and make difficult-to-detect Raman modes observable. The platform showed great industrial advantages and wide applicability due to its low cost, simple process, large controllable area, and short process time.
APPLIED SURFACE SCIENCE
(2024)
Article
Chemistry, Physical
Yasir Abbas, Shafqat Ali, Sajjad Ali, Waqar Azeem, Zareen Zuhra, Haoliang Wang, Mohamed Bououdina, Zhenzhong Sun
Summary: In this study, FeOx@SPNO-C core-shell nanospheres as a catalyst for degradation of sulfamethoxazole (SMX) were successfully synthesized. The synergistic interaction between FeOx and SPNO-C, high carbon charge density, and the presence of C = O groups and N/Fe-Nx sites were found to be key factors for the enhanced degradation of SMX.
APPLIED SURFACE SCIENCE
(2024)
Article
Chemistry, Physical
Qiaoting Yang, Yuxiao Gong, Yan Qian, Zhou-Qing Xiao, Serge Cosnier, Xue-Ji Zhang, Robert S. Marks, Dan Shan
Summary: This study proposes a hierarchical confinement strategy to design Prussian blue nanoparticles (PB NPs) with satisfactory electrocatalytic ability and stability. The catalytic synthesis of PB NPs is achieved through a hydrothermal process, and the as-prepared PB@NH2MIL exhibits efficient electronic transmission and enhanced electrocatalytic properties.
APPLIED SURFACE SCIENCE
(2024)