jablonkagroup/rise_ai_scientists huggingface dataset:
Authors: Antonio Ribeiro‐González | Carlos Agudo‐Blanco | Sergio Ramírez‐Barroso | Cristina Navío | Luis Bañares | Roger Bresolí‐Obach | Santi Nonell | Nazario Martı́n | David García‐Fresnadillo
Source: Advanced Science (article, 2025-07-06)
Field: Materials Science — Materials Chemistry

Pulsed Laser Synthesis of Carbon Nanostructures from Organic Molecular Liquids: Structure, Kinetics and Photophysical Properties The striking one-step bottom-up synthesis of carbon nanoparticles (CNPs) from visible and near infrared (NIR) light transparent air-equilibrated liquid aromatic compounds (benzene, toluene, chlorobenzene, aniline, pyrrole, and thiophene) under unfocused pulsed nanosecond laser irradiation (532/1064 nm) is reported. The formation of CNPs follows zero-order kinetics with an induction period dependent on the reactivity of the organic precursor. Experimental evidence suggests a surface-catalyzed photochemical process involving a partial change in C-atom hybridization from sp<sup>2</sup> to sp<sup>3</sup>, with oxygen-based functional groups passivating the surface of the nanostructures. The presence of additional heteroatoms depends on the structure and composition of the precursor. Contingent on the starting compound, the prepared CNPs can be classified as amorphous carbon nanodots (CNDs) or layered curved-graphene quantum dots (c-GQDs), resembling nano-onion fragments. CNDs are obtained from substituted benzenes or heterocyclic compounds, whereas c-GQDs can be synthesized from benzene. Photophysical characterization of the CNPs shows both wavelength-dependent excitation and emission bands, with constant emission quantum yields in the 1-10% range, and wavelength-dependent emission decays displaying several lifetime components in the range 1-20 ns. Triplet exciton lifetimes longer than 5 µs and wavelength-dependent singlet oxygen production quantum yields in the 10-40% range have been measured. Photochemistry ; Materials science ; Chlorobenzene ; Heteroatom ; Chemistry ; Alkyl ; Organic chemistry ; Catalysis Carbon and Quantum Dots Applications ; Luminescence and Fluorescent Materials ; Laser-Ablation Synthesis of Nanoparticles
Authors: F.M. El-Hossary | A. M. Abd El-Rahman | Ali.A. El-kamle | Mohammed H. Fawey
Source: Sohag Journal of Sciences (article, 2025-09-01)
Field: Materials Science — Polymers and Plastics

Tailoring Vanadium Oxide Thin Film Structure and Electrical Properties via Pulsed DC and RF Magnetron Sputtering Vanadium oxide thin films are increasingly explored for electronic, electrochemical, and energy-related applications due to their variable oxidation states and versatile physicochemical properties. This study systematically compares the effects of pulsed DC and RF magnetron sputtering techniques on the structural, morphological, and electrical characteristics of vanadium oxide films deposited on 304 AISI stainless steel substrates. High-purity vanadium target was sputtered in a controlled Ar/O2 environment. X-ray diffraction (XRD) revealed that pulsed DC sputtering favored the formation of monoclinic VO2, while RF sputtering promoted orthorhombic V2O5, indicating a phase transition driven by deposition parameters. The average crystallite size was smaller in pulsed DC films (~10.12 nm) than in RF films (~12.26 nm). X-ray photoelectron spectroscopy (XPS) showed that pulsed DC sputtering produced films with more stable V4+/V5+ ratios and controlled stoichiometry. In contrast, RF-deposited films exhibited higher oxidation states and greater surface contamination due to porosity. Fourier transform infrared (FTIR) spectra confirmed these phase distinctions by identifying vibrational modes corresponding to VO2-rich and V2O5-rich compositions. Scanning electron microscopy (SEM) revealed that pulsed DC film was thinner, denser, and smoother, while RF film was thicker with a porous nanostructure. Electrical measurements showed higher conductivity in pulsed DC films (~4.04 × 10-4 S/cm) than in RF films (~3.22 × 10-4 S/cm). These findings highlight the critical role of deposition technique in tailoring vanadium oxide thin films for advanced smart devices and energy systems. Pulsed DC ; Thin film ; Sputtering ; Sputter deposition ; Vanadium oxide ; Crystallite ; Vanadium ; X-ray photoelectron spectroscopy Transition Metal Oxide Nanomaterials ; Electronic and Structural Properties of Oxides ; Gas Sensing Nanomaterials and Sensors
Authors: İpek Savaş | M. Çelik | Alberto Barsella | Cagatay Dengiz
Source: Chemistry - A European Journal (article, 2025-01-23)
Field: Chemistry — Organic Chemistry

Carbamate‐Functionalized NLOphores via a Formal [2+2] Cycloaddition‐Retroelectrocyclization Strategy This study introduces a new donor group capable of activating click-type [2+2] cycloaddition-retroelectrocyclizations, generally known for their limited scope. Target chromophores were synthesized using isocyanate-free urethane synthesis. The developed synthetic method allows for the tuning of the optical properties of the chromophores by modifying the donor groups, the acceptor units, and the side chains. The charge transfer (CT) bands of the chromophores exhibit λ<sub>max</sub> values ranging from 363 to 692 nm. The CT bands observed have been supported by solvatochromism and protonation experiments. The synthesized compounds exhibit positive solvatochromism. Due to their potential as NLOphore candidates, the stability of the synthesized compounds have been investigated both experimentally through TGA and theoretically by calculating parameters such as frontier orbital energy differences, electronegativity, and global hardness/softness. TD-DFT calculations were used to elucidate the nature of the electronic transitions, revealing that the bands correspond to CT arising from HOMO-to-LUMO excitations. The NLO properties of the chromophores were investigated theoretically by DFT methods and experimentally by the EFISHG technique. Both results are shown to be in agreement with HOMO-LUMO energy differences. The experimental μβ values of the selected molecules range from 470×10<sup>-48</sup> to 5400×10<sup>-48</sup> esu. Cycloaddition ; Carbamate ; Combinatorial chemistry ; Chemistry ; Computer science ; Organic chemistry ; Catalysis Sulfur-Based Synthesis Techniques ; Chemical Synthesis and Analysis ; Chemical Synthesis and Reactions
Authors: Paul Okpozo | Jordan C. Kelly | Jennifer A. Aitken | John A. Viator | Ketan Pancholi
Source: Scientific Reports (article, 2025-10-28)
Field: Materials Science — Electronic, Optical and Magnetic Materials

The optoelectric tunability effect of structurally patterned Fe3O4-Au assembly on Rhodamine 6G signals under Magneto-SERS measurements The magneto-plasmonic tunability property of magnetite-gold complex (Fe<sub>3</sub>O<sub>4</sub>-Au) colloids has garnered significant interest in bio-sensory applications like surface-enhanced Raman spectroscopy (SERS). In many studies, this tunability does not only depend on the external magnetic field contribution but also on the concentration ratio between Fe<sub>3</sub>O<sub>4</sub> and Au. This would require multiple preparation of Fe<sub>3</sub>O<sub>4</sub>-Au colloidal badges. In this study, a magnetically stimulated Fe<sub>3</sub>O<sub>4</sub>-Au colloidal suspension in polyvinyl alcohol was spin-coated, forming a micro-patterned thin film on a silicon wafer substrate for assessing the SERS vibrational signal response of Rhodamine 6G (R6G). The varying concentration ratio between Fe<sub>3</sub>O<sub>4</sub> and Au across three regions of interest within the single cast resulted in differing optoelectronic behaviour. Such was observed from diffuse reflectance UV-Vis-NIR spectroscopy measurements, and its impact on different Raman signals of R6G. The introduction of an external magnetic field also led to approximately 133% higher peak intensity and improved spectral resolution of R6G under SERS measurements. This implies that the magnetic field polarization of Fe<sub>3</sub>O<sub>4</sub> domain electrons influences plasmon electrons of Au nanoparticles leading to tuning of electronic-influenced vibrations of nearby analyte molecules. The variability of nanoparticle concentration ratios, configurations and the magneto-optoelectronic effect of this design template, provide flexibility and tunability in diagnosing biomolecule signals under SERS. Rhodamine 6G ; Raman spectroscopy ; Plasmon ; Magnetic field ; Nanoparticle ; Surface-enhanced Raman spectroscopy ; Substrate (aquarium) ; Silicon ; Spectroscopy Gold and Silver Nanoparticles Synthesis and Applications ; Characterization and Applications of Magnetic Nanoparticles ; Plasmonic and Surface Plasmon Research
Authors: K. Kim | Jaehwan Ko | Jeonghoon Lee | Dongju Jung | Jae Seung Lee | Jaehyun Kim | Young Jae Kim | Dong Rip Kim | Chi Hwan Lee | Dahin Kim | Dennis T. Lee | Heesun Yang | Kyu Hyun | Wan Ki Bae | Hyung‐Jun Song | Byeong Guk Jeong
Source: Small Structures (article, 2025-04-17)
Field: Materials Science — Materials Chemistry

Stable Colored Photovoltaics with Thiol–Ene Crosslinked InP/ZnSe<i><sub>x</sub></i>S<sub>1<i>−x</i></sub>/ZnS Quantum Dot‐Polymer Downshifting Layers Building integrated photovoltaics (BIPVs) combine building materials and PV cells to support net zero energy buildings and maintain aesthetics. Quantum dot‐luminescent downshifting (QD‐LDS) technology can improve BIPV performance by converting barely harvested ultraviolet light into wavelengths that correspond to the high‐efficiency range of the device, using environmentally benign materials such as indium phosphide (InP) QDs. Despite their potential, InP QDs face photochemical instability against outdoor environments. To address this issue, an approach is demonstrated to formulate polymer composites with InP QDs using thiol–ene bonds, forming a crosslinked network with a transparent acrylate resin. The polymer composite shields the QDs from environmental factors, enhancing stability without deteriorating transmittance. The formulation of QD‐polymer composite enables to integrate the QD‐LDS layer into various dimensions with high degree of freedom for efficient and pleasant applying BIPV. Colored PV utilizing QD‐LDS layer demonstrates potential for developing highly efficient and stable BIPV modules, paving the way for innovative and sustainable energy solutions. Photovoltaics ; Quantum dot ; Colored ; Materials science ; Polymer ; Optoelectronics ; Thiol ; Chemistry ; Composite material ; Photovoltaic system ; Electrical engineering ; Organic chemistry Quantum Dots Synthesis And Properties ; Chalcogenide Semiconductor Thin Films ; TiO2 Photocatalysis and Solar Cells
Authors: Rebecca Strada | David J. Dunlop | Peter Šebej
Source: ChemPlusChem (article, 2025-10-03)
Field: Materials Science — Materials Chemistry

Cyanines Substituted on the Polymethine Chain: Synthesis, Resulting Properties, and Application Use Cases Cyanines comprise a diverse group of small-molecule polymethine dyes combining tunable optical properties with high molar absorptivity and fluorescence emission quantum yield, enabling various applications in bioimaging, diagnostics, molecular electronics, photonics, and nonlinear optics. These applications can be facilitated by adjusting the length of their polymethine chain and their functionalization through their end groups or the polymethine chain. Yet, the latter approach remains largely unexplored, with limited information scattered throughout literature. This review focuses on cyanines substituted on their chain, covering their synthesis, properties, and applications and providing an overview of how substituents on their polymethine chain influences their spectroscopic properties, akin to other factors, such as polymethine length and end groups. Lastly, this review illustrates how substituents on the polymethine chain facilitate the application of cyanine dyes in promising research areas. Cyanine ; Molar absorptivity ; Fluorescence ; Nonlinear optical ; Chain (unit) Luminescence and Fluorescent Materials ; Nanoplatforms for cancer theranostics ; Molecular Sensors and Ion Detection
Authors: Dong Xiang | Xu Wang | Feilong Wang | Hao Tang | Yulin Hou | Hong Lin | Yongxiang Xu
Source: Advanced Functional Materials (article, 2025-09-09)
Field: Materials Science — Biomaterials

Bioinspired Nanofibrous Spongyhydrogels via the Hofmeister Effect and Thermally Co‐Induced Assembly Abstract Human tissues integrate the advantages of both hydrogels and sponges, yet existing biomaterials fail to achieve tissue‐like hydration, mechanical adaptability, and bioactivity simultaneously. Here, a class of bioinspired nanofibrous spongyhydrogels is introduced, which bridge hydrogels and sponges by leveraging the Hofmeister effect and thermally co‐induced assembly process. Unlike conventional hydrogels that swell or sponges that lack viscoelasticity, these spongyhydrogels feature a nanofibrous network with intermediate structural scale and hydration state, enabling non‐swelling, highly compressible, and viscoelastic properties. The biomimetic nanofibrous structure promotes cell adhesion, proliferation, and in vivo wound healing. Moreover, the system allows for the incorporation of functional metal cations, opening avenues for diverse biomedical applications. This work establishes a robust platform for designing bioinspired nanofibrous materials with tunable hydration and multifunctional capabilities. Self-healing hydrogels ; Nanofiber ; Tissue engineering ; Viscoelasticity ; Biomimetic materials ; Nanoscopic scale ; Biomimetics Electrospun Nanofibers in Biomedical Applications ; Hydrogels: synthesis, properties, applications ; Polymer Surface Interaction Studies
Authors: Dilanath Adhikari | Yusuff Adeyemi Salawu | Jun Zhou | Yuwaraj K. Kshetri | Nak-Kwan Chung | Young Hwa Jung | Heon‐Jung Kim
Source: Communications Materials (article, 2025-10-14)
Field: Materials Science — Materials Chemistry

Enhancing magnetoresistance and mobility in Co3+xSn2-xS2 via non-stoichiometric doping for fermi level engineering Precise tuning of the Fermi level in topological magnetic materials is essential for optimizing electronic properties, yet conventional doping methods often degrade structural integrity and magnetic order. Here, we achieve controlled electron doping in Co3Sn2S2 via non-stoichiometric substitution in Co3+xSn2-xS2 (0 ≤ x ≤ 0.3), preserving the Kagome lattice while enhancing transport properties. This method shifts the Fermi level upward close to the Weyl nodes, leading to a crossover from hole to electron conduction at 2 K. The x = 0.27 sample exhibits a giant transverse magnetoresistance (MR) of 1150% and ultra-high carrier mobility of 18,000 cm²V⁻¹s⁻¹, surpassing conventional magnetic Weyl semimetals. Our findings highlight the role of non-stoichiometric doping in optimizing topological electronic states, positioning Co3+xSn2-xS2 as a promising candidate for spintronic and quantum transport applications. Doping is an effective approach for tuning the Fermi level of topological magnetic materials, yet can degrade magnetic order. Here, controlled electron doping via non-stoichiometric substitution is achieved in Co3+xSn2-xS2, maintaining the Kagome lattice and enhancing transport behavior. Magnetoresistance ; Spintronics ; Doping ; Fermi level ; Quantum oscillations ; Electron ; Lattice (music) ; Topological insulator Electronic and Structural Properties of Oxides ; Magnetic and transport properties of perovskites and related materials ; ZnO doping and properties
Authors: Md. Saiful Hoque | Mehnab Ali | Xiaoruo Sun | Asad Asad | Patricia I. Dolez | James D. Hogan | Dan Sameoto
Source: Micromachines (article, 2025-01-31)
Field: Materials Science — Polymers and Plastics

Development of Visibly Opaque Polyolefin Sheets While Preserving Infrared-Light Transparency This study focused on developing pigmented linear low-density polyethylene (LLDPE) sheets while preserving their mechanical properties and infrared (IR) transparency. Six pigments-ZnO, ZnS, TiO<sub>2</sub>, FeO yellow, FeO light brown, and FeO dark brown-were each mixed with polyethylene (PE) wax in a 1:1 ratio and blended with LLDPE at concentrations of 1, 3, and 5 wt%. Tensile strength tests showed minimal changes at lower pigment concentrations, with values near that of pure LLDPE (14 MPa), and slight reductions at 5 wt%. IR transparency tests, conducted using both direct and reflected heat sources, showed that white-pigmented sheets maintained over 85% transparency, while colored pigments exhibited slightly reduced IR transmittance, ranging from 70% to 91%. Fourier Transform Infrared Spectroscopy (FTIR) analysis confirmed that the critical IR transparency range of 8-12 μm remained unaffected with both pure and pigmented sheets. On the other hand, ultraviolet-visible (UV-VIS) testing showed that white-pigmented sheets experienced enhanced visible-light absorption with increasing pigment concentration and thickness, while color-pigmented sheets exhibited high opacity. Additionally, micro-structuring was performed on the LLDPE sheets to further modify their IR properties, which resulted in effective scattering of IR radiation. These findings highlight the potential of pigmented LLDPE sheets for applications requiring both visual opacity and IR transparency, such as thermal management and camouflage, as well as applications requiring tunable IR properties. Polyolefin ; Opacity ; Transparency (behavior) ; Infrared ; Materials science ; Optoelectronics ; Nanotechnology ; Optics ; Computer science ; Physics ; Computer security Polymer Nanocomposites and Properties ; Polymer composites and self-healing ; Photopolymerization techniques and applications
Authors: Lucie Suchánková | Libor Kvı́tek | Milan Kolář | Aleš Panáček
Source: FEMS Microbiology Reviews (article, 2025-12-04)
Field: Materials Science — Materials Chemistry

Emerging strategies of bacterial adaptation mechanisms to silver and metal oxide nanomaterials This review addresses the crucial and emerging field of bacterial adaptation to antimicrobial nanomaterials, challenging prior assumptions that their multi-level action prevents the development of reduced bacterial sensitivity. It provides a comprehensive overview of experimentally induced adaptation mechanisms across various nanomaterials (e.g. AgNPs, ZnO) and bacterial species. Bacterial adaptations encompass genetic adaptations (e.g. efflux systems, mutagenesis), biomolecule production (e.g. flagellin, exopolysaccharides forming biofilms, protein coronas), and structural changes (e.g. altered shape, cell wall thickening, enhanced motility, membrane permeability changes). The described adaptation mechanisms to nanomaterials are compared with antibiotic resistance mechanisms, emphasizing common strategies such as efflux and envelope changes, but also unique adaptations specific to nanoparticles, such as aggregation and different roles of biomolecules. The review offers insights and emerging strategies for designing safer, more effective nano-antimicrobials, including membrane potential disruption, biofilm inhibition, and size modulation. It emphasizes the need for standardized evaluation methods and future research on cross-resistance. Efflux ; Adaptation (eye) ; Biofilm ; Cell envelope ; Nanomaterials ; Bacterial cell structure ; Membrane permeability Nanoparticles: synthesis and applications ; Bacterial biofilms and quorum sensing ; Antimicrobial agents and applications
Authors: Dominik Fendre | Miha Lukšič | Krištof Kranjc
Source: Molecules (article, 2025-05-22)
Field: Chemistry — Organic Chemistry

Towards Greener Synthesis of Substituted 3-Aminophthalates Starting from 2H-Pyran-2-ones via Diels–Alder Reaction of Acetylenedicarboxylates The aim of this work was to prepare a large set of variously substituted 3-aminophthalates starting from substituted 3-acylamino-2<i>H</i>-pyran-2-ones acting as dienes in Diels-Alder reactions with dialkyl acetylenedicarboxylates having the role of dienophiles. These thermally allowed [4+2] cycloadditions were taking place with normal electron demand due to rather electron-deficient dienophiles and relatively electron-rich dienes; however, they still required quite harsh reaction conditions: heating in closed vessels at 190 °C for up to 17 h was sufficient in most cases (albeit for a few reactions the time needed was up to 58 h) to achieve conversions above 95%. Such conditions, unfortunately, necessitated the use of a larger excess of dienophiles (as undesired polymerization takes place concomitantly); nevertheless, the straightforward isolation procedures enabled access to the target compounds in moderate to high yields (average yield 56%). All products were characterized by standard analytical and spectroscopic methods. With the goal of changing the reaction conditions to be more environmentally friendly, we investigated the effect of various solvents (water, <i>n</i>-butanol, butyl acetate, xylene, <i>para</i>-cymene, <i>n</i>-nonane, etc.) and the temperature applied (130-190 °C) on the conversion. We found that higher temperatures are necessary in most cases (except for the most reactive 2<i>H</i>-pyran-2-ones) regardless of the solvent used. Relative reactivity was determined for both sets of reactants and the experimentally obtained data show good agreement with the computational results. Diels–Alder reaction ; Pyran ; Alder ; Chemistry ; Organic chemistry ; Combinatorial chemistry ; Catalysis ; Botany ; Biology Multicomponent Synthesis of Heterocycles ; Synthesis of heterocyclic compounds ; Synthesis and biological activity
Authors: Nadezhda Prokhorenkova | Almira Zhilkаshinova | Almira Zhilkashinova | Мadi Аbilev | Leszek Łatka | Igor Ocheredko | Assel Zhilkashinova
Source: Compounds (article, 2025-07-20)
Field: Chemistry — Organic Chemistry

Phase Composition, Structure, and Microwave Absorption of Magnetron-Sputtered Co–C–Cr Multilayer Films Multilayer thin films composed of cobalt (Co), carbon (C), and chromium (Cr) possess promising electromagnetic properties, yet the combined Co–C–Cr system remains underexplored, particularly regarding its performance as a microwave absorber. Existing research has primarily focused on binary Co–C or Co–Cr compositions, leaving a critical knowledge gap in understanding how ternary multilayer architectures influence electromagnetic behavior. This study addresses this gap by investigating the structure, phase composition, and microwave absorption performance of Co–C–Cr multilayer coatings fabricated via magnetron sputtering onto porous silicon substrates. This study compares four-layer and eight-layer configurations to assess how multilayer architecture affects impedance matching, reflection coefficients, and absorption characteristics within the 8.2–12.4 GHz frequency range. Structural analyses using X-ray diffraction and transmission electron microscopy confirm the coexistence of amorphous and nanocrystalline phases, which enhance absorption through dielectric and magnetic loss mechanisms. Both experimental and simulated results show that increasing the number of layers improves impedance gradients and broadens the operational bandwidth. The eight-layer coatings demonstrate a more uniform absorption response, while four-layer structures exhibit sharper resonant minima. These findings advance the understanding of ternary multilayer systems and contribute to the development of frequency-selective surfaces and broadband microwave shielding materials. Microwave ; Cavity magnetron ; Materials science ; Phase (matter) ; Absorption (acoustics) ; Composition (language) ; Sputter deposition ; Thin film ; Chemistry ; Sputtering ; Composite material ; Nanotechnology ; Telecommunications ; Computer science ; Organic chemistry Microwave-Assisted Synthesis and Applications ; Copper Interconnects and Reliability ; Electromagnetic wave absorption materials