Article
Optics
Reena Gadhwal, Hukum Singh, Ambika Devi, Kapil Kumar
Summary: In this article, spectral studies and optical nonlinearities of optical grade thin films fabricated from nano colloidal solutions of Ge20Te75Bi5 chalcogenide glass are reported. The emission peaks and bandgap of the films vary with the concentration and grain size of the nanocomposites. The presence of reverse saturable absorption is confirmed and the third-order optical nonlinearities can be enhanced for usage in nonlinear optical systems.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Chemistry, Physical
Justine Dagher, Riham El Kurdi, Digambara Patra
Summary: This study optimized the synthesis of colloidal silica nanoparticles by varying the type of silica precursor and concentration of sodium hydroxide. The prepared nanoparticles were applicable for the detection of silver ions, with a detection limit of 130 nM and a recovery percentage between 98.4% and 100.4%, using resonance Rayleigh scattering spectrometry.
Article
Optics
Mani Priyadarshini, Jitendra Nath Acharyya, Sumeet Mahajan, G. Vijaya Prakash
Summary: Gold nanoparticles prepared by femtosecond laser ablation and wet-chemical citrate reduction synthesis were studied for optical nonlinearities, showing distinct characteristics in nonlinear absorption. The study also demonstrated the potential of laser-produced nanoparticles for optical limiting applications due to their strong nonlinear absorption properties.
OPTICS AND LASER TECHNOLOGY
(2021)
Article
Optics
I. D. Laktaev, B. M. Saidzhonov, R. B. Vasiliev, A. M. Smirnov, O. V. Butov
Summary: The photoluminescence features of a light-hole - electron exciton transition in CdSe/CdS nanoplatelets colloidal solution under resonant two-photon excitation were investigated. The powerlaw dependence of the photoluminescence intensity on the excitation laser femtosecond pulses intensity was discovered to be related to biexciton radiation. In addition, the conditions for the photoluminescence growth and quenching were determined based on the concentration and pump intensity.
JOURNAL OF LUMINESCENCE
(2022)
Review
Chemistry, Multidisciplinary
Zachary M. Sherman, Allison M. Green, Michael P. Howard, Eric Anslyn, Thomas M. Truskett, Delia J. Milliron
Summary: The assembly of tunable nanocrystal gels using reversible chemical bonding and polymer-induced depletion attractions shows promise for creating functional materials with controllable properties, although challenges exist in translating principles to the nanoscale. The control of structure and properties at both microscopic and macroscopic levels is key in guiding the reversible assembly of nanocrystal gels. Insights from statistical thermodynamic theory and computer simulation have helped in predicting conditions for gelation and optimizing experimental parameters for targeted functionalities.
ACCOUNTS OF CHEMICAL RESEARCH
(2021)
Article
Chemistry, Multidisciplinary
Vanessa Pilati, Guilherme Gomide, Rafael Cabreira Gomes, Gerardo F. Goya, Jerome Depeyrot
Summary: This study focuses on the production of bimagnetic core@shell NPs and the use of the electric double layer (EDL) as a strategy to maintain colloidal stability in aqueous ferrofluids. By adjusting the ion/counterion ratio and controlling the water content, ultrastable concentrated ferrofluids were achieved. The influence of colloidal stability on the heating response of ferrofluids was investigated by studying different levels of nanoparticle clustering achieved through changing ionic force and medium pH.
Article
Chemistry, Physical
Lin Huang, Zikang Ye, Lei Yang, Jiongzhao Li, Haiyan Qin, Xiaogang Peng
Summary: The study proposes localization of exciton wavefunctions away from the inorganic-organic interface to synthesize colloidal spheroidal quantum dots with ultranarrow photoluminescence peak width. By controlling the synthetic process of alloy QDs, regular and uniform CdxZn1-xSe and CdxZn1-xSe/ZnSe/ZnS core/shell QDs have been successfully achieved.
CHEMISTRY OF MATERIALS
(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, Physical
Thomas Noblet, Julie Hottechamps, Marie Erard, Laurent Dreesen
Summary: This article highlights the importance of using fluorescent nanocrystals for biosensing, particularly colloidal quantum dots (QDs) which can perform resonant energy transfer (FRET). The study reveals that unlike molecular fluorophores, the emission properties of QDs are highly dependent on their size distribution, leading to energy transfers between QDs when clustered together. A mathematical model is developed to explain the efficiency of this homogeneous resonant energy transfer (homo-FRET) process, which is influenced by the statistical donor-acceptor polarization of the QD population.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Chemistry, Multidisciplinary
Taylan Bozkaya, Furkan Isik, Iklim Bozkaya, Savas Delikanli, Emre Unal, Hilmi Volkan Demir
Summary: A new class of light-sensitive nanocrystal skins (LS-NS) utilizing a monolayer of face-down orientation-controlled self-assembled CQWs as the active absorbing layer in the UV-visible range is developed, enabling non-conventional photosensing operation and self-powered operation.
Article
Chemistry, Multidisciplinary
Max E. Distler, Kaitlin M. Landy, Kyle J. Gibson, Byeongdu Lee, Steven Weigand, Chad A. Mirkin
Summary: In this study, novel DNA dendrimers were synthesized and characterized, which can break the symmetry in colloidal crystals and enable directional interactions. By modulating the shape anisotropy of the DNA dendrimers, the distribution of nanoparticles within the crystals can be precisely controlled.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Nanoscience & Nanotechnology
Li Zhang, Hongcen Zheng, Yonghai Gan, Bingdang Wu, Zhihao Chen, Shuangshuang Wei, Guoyang Zhang, Shujuan Zhang, Bingcai Pan, Chuncheng Chen
Summary: This article introduces a novel method for the synthesis and functionalization of gold nanoparticles using acetylacetone. The size of the nanoparticles can be controlled by adjusting light intensity and acetylacetone dosage. The capping role of acetylacetone allows for stable dispersion in water without changes in morphology and photochemical properties. Additionally, the nanoparticles can be used as imaging probes through reactions with other substances.
Article
Nanoscience & Nanotechnology
Jianying Ouyang, Neil Graddage, Jianping Lu, Yufang Zhong, Ta-Ya Chu, Yanguang Zhang, Xiaohua Wu, Oltion Kodra, Zhao Li, Ye Tao, Jianfu Ding
Summary: This study systematically investigates the critical synthesis parameters of Ag2Te colloidal quantum dots, showing that different Ag/Te feed ratios and ligands can significantly affect the size distribution and photoluminescence quantum yield. By optimizing the synthesis conditions, Ag2Te QDs with excellent performance were obtained for NIR-II photodetection.
ACS APPLIED NANO MATERIALS
(2021)
Article
Chemistry, Physical
Shan Xue, Shun-Li Chen, Qing Ling, Qunhui Yuan, Wei Gan
Summary: This study demonstrates that the surface redox reaction of Ag nanoparticles in colloids can be investigated using second harmonic generation (SHG) and two-photon luminescence (TPL). The oxidation of silver on AgNPs was found to accelerate upon femtosecond laser excitation, leading to a decrease in SHG and TPL emissions. This work confirms that SHG and TPL are sensitive tools for probing subtle structural changes on the surface of AgNPs.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2021)
Article
Chemistry, Multidisciplinary
Yunhee Cho, Thi Anh Le, Hyunjung Kim, Yeseul Hong, Heemin Hwang, G. Hwan Park, Sohyeon Seo, Hyoyoung Lee
Summary: The study found that ligands adsorbed on metal positions can induce partial electron localization, accelerate metal-chalcogen bond formation, and enhance the anisotropic growth of nanosheets.
Article
Physics, Condensed Matter
Alexander P. Litvinchuk, Volodymyr Dzhagan, Nazar Mazur, Volodymyr O. Yukhymchuk, Olga A. Kapush, Dietrich R. T. Zahn
Summary: First principles calculations were used to study the electronic band structure, optical properties, and lattice dynamics of the quaternary Cu2ZnSnTe4 (CZTTe) semiconductor with kesterite crystallographic structure. The analysis revealed that the highest frequency phonon mode in CZTTe involves heavy Sn and Te atoms due to their strong bonding. Experimental Raman spectra of Cu-Zn-Sn-Te nanocrystals showed characteristic and higher order overtones due to resonant conditions, while Raman features related to Sn-S vibrations appeared in the spectra of Cu-Zn-Sn-(Te-S) alloy nanoparticles, indicating a two-mode type of transformation in their vibrational spectra.
PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS
(2022)
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
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, Multidisciplinary
Volodymyr Dzhagan, Nazar Mazur, Oleksandr Smirnov, Oleg Yeshchenko, Oksana Isaieva, Mariia Kovalenko, Mykola Vuichyk, Mykola Skoryk, Yaroslav Pirko, Alla Yemets, Volodymyr Yukhymchuk, Mykhailo Valakh
Summary: Colloidal silver nanoparticles synthesized using Ganoderma lucidum extract are studied as a substrate for enhancement of SERS. The nanoparticles are nearly spherical with a mean size of 20-30 nm, as confirmed by SEM and DLS. The passivating layer on the nanoparticle surface is only a few nm thick, making these nanoparticles suitable for various applications involving plasmonic enhancement and charge or energy transfer.
JOURNAL OF NANOPARTICLE RESEARCH
(2023)
Article
Physics, Applied
Andrii Vasin, Olexander Slobodian, Andrii Rusavsky, Olexander Gudymenko, Petro Lytvyn, Stanislav Tiagulskyi, Roman Yatskiv, Jan Grym, Eugene Bortchagovsky, Volodymyr Dzhagan, Dietrich Zahn, Alexei Nazarov
Summary: Magnetron discharge plasma was used to synthesize CN (x) thin layers with different nitrogen incorporation, resulting in varied growth morphologies. The films exhibited buried porous layer, aligned nanorods, and mesoporous sponge-like structures depending on the nitrogen and discharge power. The article discusses the physical mechanisms behind the formation of nano- and mesoshaped morphologies. The CN (x) films demonstrated enhanced sensitivity to ammonia and modified electrical response to moisture due to the nitridated surface.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(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
Biochemical Research Methods
Volodymyr Dzhagan, Oleksandr Smirnov, Mariia Kovalenko, Oleksandr Gudymenko, Nazar Mazur, Olga Kapush, Mykola Skoryk, Yaroslav Pirko, Alla Yemets, Mykhailo Valakh, Petro Shepeliavyi, Volodymyr Yukhymchuk
Summary: In this study, flower-like zinc oxide nanoparticles (NPs) were synthesized using a cost-effective colloidal route with Ganoderma lucidum extract. These NPs demonstrated advantageous properties for surface-enhanced Raman spectroscopy (SERS) and other sensing applications due to their large effective surface area. The use of mycoextract as a surface stabilizer allowed for subsequent deposition of metal NPs or layers. The SERS activity of the ZnO NPs was demonstrated through the detection of standard dye analytes without additional optimization of the substrates. The observed results highlight the potential of these freestanding ZnO NPs and their dense films for various applications, including catalysis and sensing.
ANALYTICAL BIOCHEMISTRY
(2023)
Article
Biochemistry & Molecular Biology
Elena Rimskaya, Svetlana Shelygina, Alina Timurzieva, Irina Saraeva, Elena Perevedentseva, Nikolay Melnik, Konstantin Kudrin, Dmitry Reshetov, Sergey Kudryashov
Summary: Confocal scanning Raman and photoluminescence (PL) microspectroscopy is a non-invasive method for analyzing biomarkers in skin tissue. By studying different excitation wavelengths, we were able to identify distinct spectral differences in the Raman spectra of basal cell carcinoma and squamous cell carcinoma compared to healthy skin. We proposed two novel wavelength-independent spectral criteria for differentiating skin tumors based on the vibrational fingerprints of cell membrane lipids, achieving high sensitivity and specificity.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(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
Biology
Oleksandr Smirnov, Vitalii Kalynovskyi, Yuliia Yumyna, Pavlina Zelena, Tetiana Levenets, Mariia Kovalenko, Volodymyr Dzhagan, Mykola Skoryk
Summary: This study successfully synthesized silver nanoparticles (AgNPs) using an eco-friendly approach with the aqueous extract of common toothwort as a bioreductant. The phytosynthesized AgNPs exhibited excellent antimicrobial and antifungal properties, and also showed significant potential in enhancing seed germination and seedling development of emmer wheat.
Article
Materials Science, Multidisciplinary
Lysann Kassner, Thomas Ebert, Patricia Godermajer, Volodymyr Dzhagan, Dietrich R. T. Zahn, Frank Simon, Doreen Dentel, Christoph Tegenkamp, Stefan Spange, Michael Mehring
Summary: Base-catalysed twin polymerisation (TP) was used to coat solid substrates with a nanostructured phenolic resin-silica hybrid material layer. The coating process was carried out using the base-modified substrate particles as the catalyst in a slurry of diisopropylnaphtalene (DIPN). The quantity and thickness of the hybrid layers were controlled by the amount of the monomer used. The phenolic resin-silica layer was transformed into a carbon/silica layer on certain substrates, and the silica component could be removed to obtain microporous carbon layers.
MATERIALS ADVANCES
(2022)
