Article
Chemistry, Physical
Joseph Grondin, Christian Aupetit, Jean-Marc Vincent, Raphael Mereau, Thierry Tassaing
Summary: The visible light promoted perfluoroalkylation reactions involving halogen bonding interactions have been recognized as a powerful tool in radical synthetic chemistry. Studies showed that the halogen-bonded complexes are the main species present in solution during perfluoroalkylation reactions, with UV-Vis spectroscopy revealing a significant increase in absorption from 225 to 350 nm, proportional to the basicity of the Lewis base.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Article
Chemistry, Physical
Hannes Radinger, Paula Connor, Robert Stark, Wolfram Jaegermann, Bernhard Kaiser
Summary: In the study on using manganese oxide (MnOx) for the oxygen evolution reaction (OER) in water splitting, X-ray photoelectron spectroscopy and surface-enhanced Raman spectroscopy were used to gain deeper knowledge of the types of MnOx and their changes. Raman spectroscopy during electrochemical measurements revealed a correlation between activity and spectral features.
Article
Chemistry, Physical
Diana M. Arciniegas Jaimes, Valeria C. Fuertes, M. Cecilia Blanco, German Tirao, Silvina Limandri, Vivian M. Nassif, Gabriel J. Cuello, Alejandro Rodriguez, Edilso Reguera, Raul E. Carbonio
Summary: This study reports the synthesis, structural characterization, and magnetic properties of La3Mn2NbO9 double perovskite. The crystal structure shows a high degree of cation order and magnetization measurements reveal the presence of ferromagnetic and antiferromagnetic interactions at different temperatures.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Physics, Applied
A. J. X. Choorakuttil, A. Pruccoli, M. J. Winterhalder, P. Zirak, D. Gudavicius, G. Martynaitis, D. Petrulionis, D. Samsonas, L. Kontenis, A. Zumbusch
Summary: We present an experimental scheme for stimulated Raman scattering (SRS) microscopy using visible light excitation, allowing for electronically preresonant imaging of a wide range of chromophores with sensitivities as low as 1 mu M. Our experiment utilizes two synchronously pumped optical parametric oscillators (OPOs) in the near-infrared region, and by combining spectral focusing and tuning, we demonstrate the recording of epr-SRS spectra over the entire range of molecular vibrations at a speed 20 times faster than classical wavelength tuning. The imaging capabilities of this setup are demonstrated with material scientific and cellular samples.
APPLIED PHYSICS LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Jorge A. Calderon, Heiddy P. Quiroz, M. Manso-Silvan, Alvaro Munoz Noval, A. Dussan, H. Mendez
Summary: The structural, morphological, topographical, and magnetic properties of GaSb/Mn multilayers deposited via DC magnetron sputtering at room temperature and 423 K were investigated in this study. The results showed the formation of p-type GaSb layers and effective interlayers due to the neighboring Mn layer. The multilayers exhibited a columnar microstructure and the grain sizes and roughness increased with the number of layers. Additionally, the formation of interlayers between GaSb and Mn layers was observed, which contributed to the magnetic behavior of the multilayers.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2022)
Article
Chemistry, Physical
M. M. Arman, M. K. Ahmed, Mai M. El-Masry
Summary: A simple and fast method was used to synthesize cellulose acetate (CA), CA/LaFeO3, CA/graphene (G) and CA/LaFeO3/G nanocomposite films. XRD analysis showed that all films were amorphous CA polymer. Raman spectra revealed the reaction between CA polymer and G nanofiller, leading to decreased intensity. FESEM images displayed the porous nature and smooth surface morphology of CA film. UV spectra and optical properties indicated the potential applications of the films in converting harmful UV radiation into red light, with CA/G film having the highest conversion efficiency.
JOURNAL OF MOLECULAR STRUCTURE
(2023)
Article
Chemistry, Multidisciplinary
Noelia Rubio, Heather Au, Gabriel O. Coulter, Laure Guetaz, Gerard Gebel, Cecilia Mattevi, Milo S. P. Shaffer
Summary: The study shows that the locus of functionalisation on graphene-related materials and the progress of the reaction strongly depend on the starting feedstock. Experiments with five characteristically different graphite sources reveal an increase in grafting ratio and an improvement in grafting stoichiometry as flake radius decreases. Raman spectrum imaging indicates that grafting is directed towards flake edges.
Article
Biochemical Research Methods
Michael Foster, William Brooks, Philipp Jahn, Jesper Hedberg, Andreas Andersson, And Lorna Ashton
Summary: This paper introduces a new deep UV Raman instrument that can provide high specificity and accuracy for biopharmaceutical products, with the potential for online measurement.
JOURNAL OF BIOPHOTONICS
(2022)
Article
Chemistry, Inorganic & Nuclear
Shuhang Liu, Jun Han, Rongli Cui, Xin Yang, Yunfan Fei, Xingyu Tang, Yida Wang, Yajie Wang, Yongjin Chen, Jiajia Feng, Haiyan Zheng, Kuo Li, Xiaoyang Liu
Summary: In this work, Gd-doped diamond was synthesized from an endohedral metallofullerene (EMF) under high pressure and high temperature conditions. The experiments showed that Gd was uniformly distributed in the diamond lattice, exhibiting dilute paramagnetic properties, and the lattice parameters of diamond were enlarged. This study provides insights into the synthesis of other metal-doped diamond materials.
INORGANIC CHEMISTRY FRONTIERS
(2023)
Article
Chemistry, Physical
Steffen M. Brulls, Valentina Cantatore, Pui Lam Tam, Per Malmberg, Elisabet Ahlberg, Itai Panas, Siegfried Eigler, Jerker Martensson
Summary: Functionalization and modulation of graphene's electronic properties using organic polycations were investigated. Wet-chemical non-covalent functionalization was performed on chemical vapor deposition graphene and reduced graphene oxide. The number of anions and the properties of the benzimidazole-based systems were found to play a crucial role in determining the redox properties and bonding to graphene. This study provides insights into the cooperative effects of the system's structure and anions on the binding affinity.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Biochemistry & Molecular Biology
Maria Pachetti, Francesco D'Amico, Luisa Zupin, Stefania Luppi, Monica Martinelli, Sergio Crovella, Giuseppe Ricci, Lorella Pascolo
Summary: This study aimed to use UV resonance Raman spectroscopy to monitor molecular modifications in nucleic acids and support the selection of high-quality sperm samples in ART. The results suggest that UVRR can be utilized as an inexpensive tool for semen quality assessment.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2021)
Article
Materials Science, Ceramics
Zexing Wang, Yunfeng Guo, Jiamao Li
Summary: In this paper, a series of Li2Zn[Ti1-x(Co1/3Nb2/3)x]3O8 ceramics were prepared via the conventional solid-state method. The influences of (Co1/3Nb2/3)4+ complex ions on the phase composition, spectral characteristics, microstructure, and microwave dielectric properties of Li2Zn[Ti1-x(Co1/3Nb2/3)x]3O8 ceramics were systematically studied. The study found that the presence of (Co1/3Nb2/3)4+ content affected the structure, performance, and microwave dielectric properties of Li2Zn[Ti1-x(Co1/3Nb2/3)x]3O8 ceramics.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Coatings & Films
Fangfang Zeng, Lianchang Qiu, Shan He, Liying Wu, Jifei Zhu, Kai Li, Huixin Liu, Yong Du
Summary: Transition metal nitrides and diborides have high melting points, excellent chemical stability, and good thermal conductivity, but oxidation is a common issue in high-temperature environments. In this study, single layer TiB1.73, Al0.59Ti0.41N, and bilayer TiB1.73/Al0.59Ti0.41N coatings were deposited on cemented carbide inserts using the HiPIMS method, and their oxidation behavior and phase transition were investigated through experiments and phase diagram calculations.
SURFACE & COATINGS TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Zhichen Yan, Shuangyue Wang, Xianjue Chen, Geedhika K. Poduval, John A. Stride
Summary: Chemical vapor deposition (CVD) shows great potential in large-scale production of graphene films. A new method has been developed to directly grow graphene films on crystalline silicon wafers with a 300 nm oxide layer using a seeded-CVD growth approach. The use of methane as feedstock and optimized graphene seeds has improved the film formation, which consists of graphene layers formed by the coalescence of expanding graphene seeds according to SEM, X-ray photoelectron and Raman spectroscopies. The films also exhibit regions of single graphene crystallites resulting from lateral growth of the seeds. Moreover, the unilateral conductivity of the graphene films suggests potential application in device fabrication due to the presence of graphene nanoribbons.
JOURNAL OF MATERIALS SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Un Jeong Kim, Seung Hyun Nam, Juyeon Seo, Mino Yang, Qundong Fu, Zheng Liu, Hyungbin Son, Moonsang Lee, Myung Gwan Hahm
Summary: This study introduces how the crystallographic structure and quality of atomic-layered materials can be projected through Raman spectroscopy analysis, with a specific focus on a two-dimensional layered material.
Article
Nanoscience & Nanotechnology
Spyridon G. Kosionis, Emmanuel Paspalakis
Summary: In this study, we theoretically investigate the pump-probe response and the four-wave mixing spectrum in a hybrid system composed of a semiconductor quantum dot and a spherical metal nanoparticle. Using a density matrix methodology, we calculate the absorption/gain, dispersion, and four-wave mixing spectra, and analyze their spectral characteristics. We also apply the metastate theory and the dressed-state picture to predict the positions of the spectral resonances.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2024)
Article
Nanoscience & Nanotechnology
L. S. Lima
Summary: This study investigates quantum correlation and entanglement in the non-Hermitian Hubbard model. By analyzing quantum entanglement measures such as entanglement negativity and entropy, the effect of non-Hermitian imaginary hopping on the system is explored. It is found that in the large... limit, the non-Hermiticity reverses the behavior of the ground state energy and low-lying excitations.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2024)
Article
Nanoscience & Nanotechnology
Nam-Chol Ri, Chung-Sim Kim, Sang-Ryol Ri, Su-Il Ri
Summary: By decreasing the lattice thermal conductivity of GNR through chemical derivation and strain, enhancing the thermoelectric properties of the electron part can be an important method to approach PGEC. This paper proposes synthesized hybrid systems formed by chemical derivation in the middle parts of b-AGNRs, and investigates the band structures and thermoelectric properties of the electron part under different strains. The results show that the band gaps of the systems significantly increase under different strains.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2024)
Article
Nanoscience & Nanotechnology
Le T. T. Phuong, Tran Cong Phong
Summary: This study investigates the effects of gas molecules adsorbed on /312-borophene on its electronic heat capacity and thermal Schottky anomaly. The results show that the adsorbed gas molecules have different impacts on the electronic heat capacity, leading to the generation of various new energy levels.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2024)
Article
Nanoscience & Nanotechnology
Tianyan Jiang, Jie Fang, Wentao Zhang, Maoqiang Bi, Xi Chen, Junsheng Chen
Summary: This paper investigates the adsorption and sensing properties of transition metal-doped WSSe gas-sensitive devices towards H2, CO, and CO2 gases related to thermal runaway in Li-ion batteries using density functional theory. The results show that Ti, Mn, and Mo dopants preferentially bind to the S-surface of the WSSe monolayer, and all three monolayers exhibit significantly improved sensing characteristics, with chemisorption towards CO. Band structure analysis suggests that the Ti-WSSe monolayer has the potential to be used as a resistive CO detection sensor. Recovery time calculations indicate the reuse capabilities of the gas-sensitive devices. Mn-WSSe monolayer shows potential for H2 detection, while Mo-WSSe monolayer is more suitable for CO2 detection. This work lays the foundation for potential gas-sensitive applications of WSSe monolayer in thermal runaway scenarios, advancing research in gas sensing domains.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2024)
Article
Nanoscience & Nanotechnology
Olga A. Alekseeva, Aleksandr A. Naberezhnov, Ekaterina Yu. Koroleva, Aleksandr Fokin
Summary: This study investigates the temperature dependence of crystal structure and dielectric response in a nanocomposite material containing porous glasses and embedded sodium nitrate. The results reveal a crossover point in the temperature dependence of the order parameter of the structural transition in sodium nitrate nanoparticles, as well as a decrease in activation energy of sodium ions hopping conductivity during heating.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2024)
Article
Nanoscience & Nanotechnology
Lijun Cheng, Fang Cheng
Summary: This paper investigates the effects of electric and magnetic fields on the Goos-Hanchen (GH) shift in a semi-Dirac system. The results show that the magnitude and direction of the GH shift depend on various factors such as incidence angle, electric barrier height and width, and magnetic field. It is observed that there is a saltus step in GH shifts at the critical magnetic field, which decreases with increased potential barrier thickness. Additionally, the GH shift can be significantly enhanced by applying an electric field in the III region. These findings are important for the development of semi-Dirac based electronic devices.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2024)
Article
Nanoscience & Nanotechnology
Alexander K. Fedotov, Uladzislaw E. Gumiennik, Julia A. Fedotova, Janusz Przewoznik, Czeslaw Kapusta
Summary: The study conducted an improved analysis of carrier transport in single-layer graphene and hybrid structures, showing the coexistence of negative and positive contributions in magnetoresistive effect. Various models were used to analyze the dependences on temperature and magnetic field, providing insights into the behavior of electrical resistance in the structures.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2024)
Article
Nanoscience & Nanotechnology
Xuhui Peng, Tao Chen, Ruotong Chen, Shizheng Chen, Qing Zhao, Xiaoping Huang
Summary: In this study, a novel method was proposed to design and fabricate optoelectronic devices with highly precise controlled photorefractive liquid crystal structures. By utilizing quantum dots and electric tuning, a regular periodic grating was formed in a quantum dot-doped liquid crystal volume illuminated by a laser standing evanescent wave field. The obtained optical diffraction pattern showed equally spaced light spots and high diffraction efficiency, indicating a significant change in the refractive index of the nanostructured device.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2024)
Article
Nanoscience & Nanotechnology
Kai-Hua Yang, Xiao-Hui Liang, Huai-Yu Wang, Yi-Fan Wu, Qian-Qian Yang
Summary: In this work, a theoretical model is proposed to achieve the controllability of quantum interference and decoherence. The effects of intralead Coulomb interaction, interdot tunneling, and electron-phonon interactions on differential conductance are investigated. The results show the appearance of destructive interference, Fano interference, and negative differential conductance in strong dot-lead tunneling regions, while a characteristic pattern of positive and negative differential conductances appears in the weak dot-lead tunneling regime.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2024)
Article
Nanoscience & Nanotechnology
Xueying Wang, Qian Ma, Qi Zhang, Yi Wang, Lingyu Li, Dongheng Zhao, Zhiqiang Liu
Summary: Porous double-channel alpha-Fe2O3/SnO2 heterostructures with tunable surface/interface transport mechanism were successfully fabricated by electrospinning and calcination. These heterostructures exhibited a large specific surface area, providing more active sites and enhanced adsorption capacity. The optimal composite materials showed the highest response value and the fastest response/recovery times to DMF, along with good cycling performance, long-term stability, and high gas selectivity.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2024)
Article
Nanoscience & Nanotechnology
Donglin Guo, Zhengmeng Xu, Chunhong Li, Kejian Li, Bin Shao, Xianfu Luo, Jianchun Sun, Yilong Ma
Summary: Using full electron-phonon interactions and the Boltzmann transport equation, this study investigates the phonon scattering channel and electrical properties of graphene under anharmonic phonon renormalization (APRN). The results show that the APRN reduces the phonon frequency and three-phonon phase space with increasing temperature, affecting the acoustic branch more than the optical branch. The thermal conductivity of graphene decreases after considering three- and four-phonon scattering, and the primary scattering channels are identified. Furthermore, the APRN increases the strength of electron-phonon coupling and leads to an increase in n-type electric resistance at room temperature.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2024)
Article
Nanoscience & Nanotechnology
Hongping Zhao, Man Zhao, Dayong Jiang
Summary: The study proposes a broadband photodetector with high response, high sensitivity, and controllable band by integrating quantum dots and highly conductive materials. The PD composed of ZnO film/PbS quantum dots heterostructure shows excellent photoresponse performance in the UV-Vis-NIR range, with the peak responsivity increased by 550%, accompanied by significant red shift, faster response, and recovery speed. By using RF magnetron sputtering to prepare ultra-thin ZnO film, the impact of PbS quantum dots on the photoelectric properties of ZnO film is comprehensively and systematically discussed.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2024)
Article
Nanoscience & Nanotechnology
Ye Xuan Meng, Liwei Jiang, Yisong Zheng
Summary: Manipulating magnetism by electrical means is an effective method for realizing ultra-low power spintronic-integrated circuits. In this study, it is demonstrated that the two-dimensional semiconductor material InO monolayer can be tuned to a half-metallic state by applying a gate voltage, providing theoretical guidance for adjusting two-dimensional magnetic semiconductors.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2024)
Article
Nanoscience & Nanotechnology
Anusha Kachu, Aalu Boda
Summary: In this research, we investigated the impact of confinement nature on a neutral hydrogenic donor impurity in a quantum dot. The study demonstrated intriguing behavior in response to changes in potential shape, quantum dot parameters, and spin-orbit coupling strengths. The findings provide valuable insights into the fundamental physics of quantum dots and impurities and can aid in the design and optimization of QD-based technologies.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2024)