Article
Materials Science, Multidisciplinary
Camila Ianhez-Pereira, Akhil Kuriakose, Ariano De Giovanni Rodrigues, Ana Luiza Costa Silva, Ottavia Jedrkiewicz, Monica Bollani, Marcio Peron Franco de Godoy
Summary: This study aims to evaluate the crystalline changes induced by ultrafast laser micromachining on manganese oxide thin films using micro-Raman spectroscopy. The results show that laser-writing is effective in locally modifying low-crystallinity films and increasing crystallite sizes, highlighting an interesting approach to evaluate laser-induced structural modifications on metal oxide thin films.
Article
Multidisciplinary Sciences
M. R. Sazideh, M. H. Ehsani, M. M. Shahidi, H. Rezagholipour Dizaji
Summary: In this study, Tin (II) sulfide films were deposited on different substrates using the Physical Vapor Deposition method with Glancing Angle Deposition technique. The effects of substrate crystalline structure and deposition angles on the structure of SnS nano-plates were investigated. The phonons lifetime, atomic ratio, and morphological characteristics of the samples were analyzed. The formation of the second phase of Sn2S3 was confirmed, and the relationship between substrate roughness and SnS nano-sheets growth process was explained.
SCIENTIFIC REPORTS
(2022)
Article
Chemistry, Physical
Stepan Stehlik, Michel Mermoux, Bernhard Schummer, Ondrej Vanek, Katerina Kolarova, Pavla Stenclova, Ales Vlk, Martin Ledinsky, Rene Pfeifer, Oleksandr Romanyuk, Ivan Gordeev, Francine Roussel-Dherbey, Zuzana Nemeckova, Jiri Henych, Petr Bezdicka, Alexander Kromka, Bohuslav Rezek
Summary: The study investigated the effects of size on the surface chemistry, microscopic structure, and Raman scattering of nanodiamonds, revealing size-dependent and synthesis-dependent differences in their properties. By analyzing particle size distribution and comparing detonation and high-pressure high-temperature nanodiamonds, the study identified effects of diamond core size, defects, chemical stability, and phonon confinement models. Additionally, low-frequency Raman scattering was observed, suggesting confined acoustic vibrational modes in the nanodiamonds.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Chemistry, Physical
Roman Kusterer, Charlotte Ruhmlieb, Christian Strelow, Tobias Kipp, Alf Mews
Summary: The effects of oxygen on the optical properties of wet-chemically synthesized colloidal CdSe quantum wires were investigated using confocal spectroscopy. It was found that both irreversible photoluminescence enhancement and quenching processes occurred in oxygen and reversible changes in the emission spectra and Raman spectra were observed when changing the gas atmosphere. The irreversible photoluminescence enhancement was attributed to reduction of Auger recombination by formation of oxides on the surface, while the reversible changes were attributed to electron scavenging by oxygen.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Chemistry, Physical
Roman Kusterer, Charlotte Ruhmlieb, Christian Strelow, Tobias Kipp, Alf Mews
Summary: In this study, the effects of oxygen on the optical properties of wet-chemically synthesized colloidal CdSe quantum wires were investigated using confocal spectroscopy. Results showed that oxygen caused irreversible photo-luminescence enhancement and quenching processes, as well as reversible changes in emission intensity and wavelengths. These effects may be attributed to the formation of oxides on the surface and electron scavenging by oxygen.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Materials Science, Multidisciplinary
Mihail Elisa, Stefan-Marian Iordache, Ana-Maria Iordache, Madalin Ion Rusu, Gabriel Socol, Mihaela Filipescu, Cristina Bartha, Monica Enculescu
Summary: In this study, a composite material for optoelectronic applications was investigated, involving CdSe-doped glass film prepared by pulsed laser deposition. The optical absorption spectra revealed exciton peaks and the dependence of CdSe quantum dots band gap energy on quantum confinement effect. Photoluminescence of the CdSe-doped film exhibited peaks corresponding to transitions from the excited state to the ground state. The size of CdSe nanoclusters was correlated with different imaging techniques, and specific vibration modes were identified through spectroscopy analyses.
Article
Chemistry, Multidisciplinary
Dongjin Xie, Qiuyi Luo, Shen Zhou, Mei Zu, Haifeng Cheng
Summary: A one-step solvothermal method was used to prepare Cr2O3-based pigment inks with long-term dispersion stability, demonstrating superior dispersion stability of the Cr2O3 particles capped by ligands. The ink remained stable under a natural sediment test for 2.5 years, and successful printing on nylon fabrics was achieved, showing a spectral correlation coefficient of 0.9043 to green leaves.
NANOSCALE ADVANCES
(2021)
Article
Chemistry, Multidisciplinary
Zachary R. Lindsey, Malachi West, Peter Jacobson, John Robert Ray
Summary: Compared to Si, GaAs has advantages such as high carrier mobility and energy conversion efficiency, making it a leading competitor in optoelectronics and solar energy conversion. This research demonstrates the electrodeposition and controlled alloying of polycrystalline InxGa1-xAs films at ambient pressure and near-room temperature using the electrochemical liquid-liquid-solid (ec-LLS) process.
CRYSTAL GROWTH & DESIGN
(2022)
Article
Engineering, Electrical & Electronic
Suat Pat, Reza Mohammadigharehbagh, Nihan Akkurt, Sadan Korkmaz
Summary: In this research, Ta doped ZnO thin films were successfully deposited using the TVA system. Various analysis methods were used to study the properties of the films, revealing changes in band gap after doping and the presence of β'-Ta2O5 in the structure. Factors such as doping levels and substrate materials have a significant impact on the film properties.
OPTICAL AND QUANTUM ELECTRONICS
(2021)
Article
Chemistry, Physical
Laura Kampermann, Julian Klein, Jannik Korte, Oliver Kowollik, Oliver Pfingsten, Tim Smola, Sascha Saddeler, Tobias Horst Piotrowiak, Soma Salamon, Joachim Landers, Heiko Wende, Alfred Ludwig, Stephan Schulz, Gerd Bacher
Summary: The structural and optical properties of CoxFe3-xO4 nanoparticles change with increasing Fe content, as revealed by Raman and absorption spectroscopy, with inter valence charge transfer processes becoming more prominent. The photoluminescence of the nanoparticles shows a broad band with a peak at around 510 nm, while temperature-resolved experiments indicate that the green photoluminescence is likely due to OH-groups on the surface.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Materials Science, Ceramics
Ashok Ande, J. Bhemarajam, Venkanna Kanneboina, Swapna, M. Prasad
Summary: Silver nanoparticles were synthesized in Dy3+ doped lithium zinc borate glasses by conventional melt quenching method. The impact of silver nanoparticles on the luminescence properties of the glasses was investigated, and the structural characteristics of the glasses were confirmed through XRD measurements as well as Raman and Fourier transform infrared spectra.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2021)
Article
Chemistry, Multidisciplinary
Rana Faryad Ali, Byron D. Gates
Summary: This study compares the effects of different Li precursors on the synthesis of LiNbO3 NPs, showing that the choice of Li precursor plays a crucial role in nanoparticle formation and can affect crystallinity and size. By adjusting the Li precursor, the uniformity, crystallinity, and aggregation of LiNbO3 NPs can be controlled.
Article
Engineering, Electrical & Electronic
H. H. Gullu, M. Isik, O. Surucu, N. M. Gasanly, M. Parlak
Summary: This study investigated the structural, optical, and band gap characteristics of thermally evaporated CdSe thin films, showing preferential orientation and a Cd/Se ratio close to 1.0. Temperature-dependent band gap properties were explored for the first time, with the direct band gap energy decreasing from 1.750 eV to 1.705 eV. The Varshni model was successfully applied, and various optical constants were determined, providing valuable data for researchers studying optoelectronic device applications of CdSe thin films.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2021)
Article
Chemistry, Inorganic & Nuclear
Shengjie Xiong, Jia Li, Maobin Wei, Donglai Han, Jihui Lang, Huilian Liu, Jinghai Yang, Yang Liu, Ming Gao
Summary: Ag-doped MoS2 (AMS(x)) was prepared as a SERS substrate with excellent reproducibility, stability, and recyclability. It exhibited an enhancement factor of 4.07 x 10(6) and a detection limit of 10(-9) M, proving its potential for applications in SERS sensing.
DALTON TRANSACTIONS
(2023)
Article
Chemistry, Physical
Aleksey A. Nikitin, Anton Yu Yurenya, Raul R. Gabbasov, Valeriy M. Cherepanov, Mikhail A. Polikarpov, Michael A. Chuev, Alexander G. Majouga, Vladislav Ya Panchenko, Maxim A. Abakumov
Summary: In this study, Mossbauer spectroscopy and dynamic light scattering were used to investigate the self-diffusion coefficient and hydrodynamic size of iron-containing nanoparticles in complex solutions. The results show that the diffusion of CFNs greatly affects the broadening of Mossbauer spectra.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Review
Physics, Condensed Matter
Volodymyr Dzhagan, Alexander P. Litvinchuk, Mykhailo Ya Valakh, Dietrich R. T. Zahn
Summary: Ternary and quaternary metal-chalcogenides, such as CuInS2 and Cu2ZnSn(S,Se)(4), have gained significant attention for their applications in alternative energy conversion and light-emitting devices. These compounds offer more sustainable and affordable solutions compared to traditional semiconductors. However, their tolerance to non-stoichiometric compositions and polymorphism can lead to undesirable coexistence of different compounds and point defects, posing challenges for practical applications. Raman spectroscopy has emerged as a powerful tool for structural diagnostics and characterization of these compounds, especially in the context of nanostructures. This review aims to summarize the current knowledge on the phonon spectra and the capabilities of Raman and IR spectroscopies in characterizing these promising families of compounds.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2023)
Article
Chemistry, Multidisciplinary
Oleksandr Smirnov, Volodymyr Dzhagan, Mariia Kovalenko, Oleksandr Gudymenko, Veronika Dzhagan, Nazar Mazur, Oksana Isaieva, Zoia Maksimenko, Serhiy Kondratenko, Mykola Skoryk, Volodymyr Yukhymchuk
Summary: Fungi produce and excrete various substances that can be used for green synthesis of metal and semiconductor nanoparticles. In this study, flower-like ZnO nanoparticles were synthesized using an extract of Ganoderma lucidum as a reducing agent and stabilizer. The resulting nanoparticles exhibited a large effective surface and high crystallinity.
Article
Polymer Science
Doan Vu, Wen Liang Tan, Lu He, Alexander Ehm, Dietrich R. T. Zahn, Christopher R. McNeill
Summary: We report the discovery of a third crystalline polymorph of the electron-transporting conjugated polymer P(NDI2OD-T2), called form III, which exhibits an end-on texture. This new polymorph is characterized by the incorporation of two monomer units along the backbone-stacking direction, resulting in a doubling of the unit cell c axis. The formation of form III crystallites is achieved by melt annealing a thin film followed by slow cooling. Analysis using grazing-incidence wide-angle X-ray scattering (GIWAXS) and peak simulation confirms the unique packing of this polymorph. This discovery presents an exciting opportunity to study the structure/function relationships of this important semiconducting polymer.
Article
Chemistry, Multidisciplinary
Yevhenii Havryliuk, Volodymyr Dzhagan, Anatolii Karnaukhov, Oleksandr Selyshchev, Julia Hann, Dietrich R. T. Zahn
Summary: In this study, the composite films of Cu2ZnSnS4 (CZTS) nanocrystals (NCs) with PEDOT:PSS were investigated. The structural stability of both NCs and polymers in the composite films with different ratios was studied. It was found that CZTS NCs and PEDOT:PSS mutually influence each other in the composite. The thermoelectric properties of PEDOT:PSS/CZTS composite films were higher compared to the films consisting of bare materials and can be further improved with the addition of DMSO. However, the presence of NCs in the polymer deteriorates its structural stability when subjected to flash lamp annealing or laser treatment.
Article
Crystallography
Mykhailo Valakh, Alexander P. Litvinchuk, Yevhenii Havryliuk, Volodymyr Yukhymchuk, Volodymyr Dzhagan, Dmytro Solonenko, Sergei A. Kulinich, Lyudmyla Piskach, Yuriy Kogut, Lu He, Dietrich R. T. Zahn
Summary: AgGaGeS4 is a promising material with desired nonlinear properties in the infrared range. Experimental phonon and Raman spectra of AgGaGeS4 single crystals synthesized by modified Bridgman method are presented. The infrared absorption spectra are obtained from fitting reflectivity to a dielectric function model. Temperature dependence of Raman spectra is investigated between room temperature and 15 K.
Article
Chemistry, Physical
N. N. Kurus, I. A. Milekhin, N. A. Nebogatikova, I. Antonova, E. E. Rodyakina, A. G. Milekhin, A. Latyshev, D. R. T. Zahn
Summary: This study focuses on enhancing Raman scattering in multilayered graphene films through plasmonic interaction. By placing the films on a plasmonic substrate consisting of arrays of gold nanodisks, resonant Raman enhancement of the main vibrational modes of multilayered graphene was achieved. The results showed a 25-fold enhancement for nanodisks with a diameter of 103 nm. Moreover, stronger local enhancement (50-fold) was obtained using gap-mode tip-enhanced Raman scattering. The study also revealed the presence of nanofolds in the graphene film, which exhibited mechanical stresses up to 0.7% and lower frequency positions for certain vibrational modes.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Engineering, Electrical & Electronic
A. Ievtushenko, V Dzhagan, O. Khyzhun, O. Baibara, O. Bykov, M. Zahornyi, V Yukhymchuk, M. Valakh, D. R. T. Zahn, K. Naumenko, P. Zaremba, S. Zagorodnya
Summary: Ag-containing ZnO nanostructures were synthesized on Ag coated Si substrates using atmospheric pressure metal-organic chemical vapour deposition. The relation between structural parameters and chemical composition with photoluminescence properties and electron-phonon coupling was investigated through XRD, XPS, and Raman spectroscopy. The position and width of the phonon Raman peaks and near bandgap PL band were found to be determined by the structural quality of the crystallites. The heat dissipation in the film, influenced by the nanostructure morphology and Ag content, played a crucial role in the behavior of phonon and PL bands.
SEMICONDUCTOR SCIENCE AND TECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Yevhenii Havryliuk, Volodymyr Dzhagan, Anatolii Karnaukhov, Oleksandr Selyshchev, Julia Hann, Dietrich R. T. Zahn
Summary: The problem of waste heat in solar panels has led to research on hybrid solar cells that combine photovoltaic and thermoelectric properties. One potential material for this is Cu2ZnSnS4 (CZTS). In this study, CZTS thin films were formed using green colloidal synthesis and subjected to thermal annealing or flash-lamp annealing. The optimal temperature range for obtaining conductive nanocrystalline films and determining reliable thermoelectric parameters was found to be 250-300 ?. The presence of the CuxS phase was found to be important for the electrical and thermoelectric properties of CZTS films obtained in this way.
Article
Chemistry, Multidisciplinary
Volodymyr Dzhagan, Nazar Mazur, Olga Kapush, Oleksandr Selyshchev, Anatolii Karnaukhov, Oleg A. Yeshchenko, Mykola I. Danylenko, Volodymyr Yukhymchuk, Dietrich R. T. Zahn
Summary: This study investigates the influence of the parameters of the shell and interface in semiconductor core/shell nanocrystals (NCs) on their optical properties and charge transfer, using Raman spectroscopy. The results show that the use of thioglycolic acid (TGA) during the synthesis leads to the formation of a CdS shell around the CdTe core in the NCs. The optical absorption and photoluminescence bands of these NCs are determined by the CdTe core, while the far-infrared absorption and resonant Raman scattering spectra are dominated by the vibrations related to the shell.
Article
Chemistry, Physical
Oleksandr Stroyuk, Cosima Guettler, Claudia Buerhop-Lutz, Jens Hauch, Ian Marius Peters
Summary: The feasibility of identifying the backsheet composition of field-aged Si photovoltaic modules was demonstrated by analyzing the characteristic patterns of UV-excited fluorescence of ethylene vinyl acetate copolymer encapsulant. The approach involves the use of vibrational spectroscopies to identify the backsheet and the creation of a database of characteristic UV-excited fluorescence patterns. By employing multivariate principal component analysis on the UV-excited fluorescence images of unknown samples, combined with the UV-excited fluorescence pattern database, the backsheet type can be identified solely from UV-excited fluorescence images. The geometric position of specific samples in the principal component plots indicates the overall degradation status of photovoltaic modules.
ACS APPLIED ENERGY MATERIALS
(2023)
Article
Chemistry, Physical
Serhiy Kondratenko, Oleksandr I. Datsenko, Danylo Babich, Volodymyr Dzhagan, Yang Pan, Mahfujur Rahaman, Oleksandr Selyshchev, Dietrich R. T. Zahn
Summary: This study presents the fabrication of hybrid 2D-QD MoS2-AgInS2 photoconductive devices by pressing a MoS2 flake onto an AgInS2 QD film. The devices exhibit enhanced photoresponse under continuous and modulated optical excitations, attributed to the built-in electric field near the MoS2/AgInS2 interface. The study demonstrates the potential of these devices for photovoltaic and optoelectronic applications.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Chemistry, Physical
Lu He, Dietrich R. T. Zahn, Teresa I. I. Madeira
Summary: Titanium dioxide (TiO2) thin films have photocatalytic properties and can be used for recycling and maintenance. Factors affecting their performance include nanocrystalline size, surface morphology, and phase composition, which need to be better studied and correlated.
