Optical Materials最新文献

{"title":"Harnessing inherent charge retention characteristics of ZnO thin films for capacitive ultraviolet dosimeters","authors":"Abhishek Ranjan ,&nbsp;Aishani Mazumder ,&nbsp;Narayanan Ramakrishnan","doi":"10.1016/j.optmat.2025.116986","DOIUrl":"10.1016/j.optmat.2025.116986","url":null,"abstract":"<div><div>Over the years, ZnO, a well-known transparent semiconducting oxide (TSO) has been continuously investigated due to its inherent electronic and optoelectronic properties. Despite its remarkable visible blind optoelectronic properties, its application as a UV-specific detector remains a challenge due to its slow recovery. Although this charge retention characteristic is beneficial for synaptic applications, it becomes disadvantageous for UV detection and monitoring purposes. Thus, a gap remains in utilising this well-established TSO's charge retention characteristics as a UV detector and cumulative dosage calculator in the visible-blind region. Hence, an alternate instrumentation strategy is needed to exploit the UV-only absorption properties of ZnO to demonstrate a reliable UV-based dosimeter. In this work, we exploit the structural design of interdigitated electrodes (IDE) to utilise the capacitive properties of RF-sputtered ZnO thin films. Significantly large capacitance changes in the range of 10 ⁻¹¹ – 10 ⁻⁹ F are observed in the device upon UV illumination. The ZnO-based device demonstrates an increasing trend in capacitive changes upon cumulative UV exposure, even at low intensities of 50 μW/cm² which, remains unobserved in its resistive changes. The performance of the devices is evaluated under the influence of humidity and temperature and its feasibility as a dosimeter is demonstrated. Such a demonstration on a flexible platform provides a pathway for integrating ZnO thin films as a wearable UV dosimeter monitoring device in the future.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"163 ","pages":"Article 116986"},"PeriodicalIF":3.8,"publicationDate":"2025-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143735082","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Synthesis of ZnO nanorods on TiO2 and ZnO inverse opal structures prepared via thermal-atomic layer deposition and hydrothermal growth for photocatalytic applications","authors":"Lucy Nyambura Karanja ,&nbsp;Dániel Karajz ,&nbsp;Dóra Hessz ,&nbsp;Tamás Igricz ,&nbsp;Baradács Eszter Mónika ,&nbsp;Pál Petra ,&nbsp;Zoltán Erdélyi ,&nbsp;Csaba Cserháti ,&nbsp;Barbara Sárközi ,&nbsp;Imre Miklós Szilágyi","doi":"10.1016/j.optmat.2025.116989","DOIUrl":"10.1016/j.optmat.2025.116989","url":null,"abstract":"<div><div>Industrial pollutants, including synthetic dyes and organic compounds, pose serious environmental risks, making efficient remediation methods crucial. In this study, opal templates were fabricated using the Evaporation Induced Confined Area Assembly (EICAA) method, where polystyrene nanospheres (300 nm) were precisely assembled on silicon wafers. Subsequently, ZnO and TiO₂ layers were deposited onto the templates using thermal ALD. The polystyrene templates were then removed via calcination at 500 °C. Hydrothermal synthesis was employed to grow ZnO nanorods on the prepared structures. Comprehensive characterization was conducted using TG/DTA/DTG, SEM-EDX, XRD, Raman spectroscopy, UV–Vis spectrophotometry, and photoluminescence analysis. The results showed that the samples exhibited a well-ordered, crystalline inverse opal structure with vertically aligned nanorods on their surface. The photocatalytic performance of the samples was evaluated through the degradation of methylene blue and 4-nitrophenol under UV and visible light irradiation.</div><div>Photocatalytic tests revealed that ZnO inverse opals exhibited higher photocatalytic activity than TiO₂ inverse opals. The growth of ZnO nanorods on TiO₂ inverse opals significantly improved their activity, owing to the formation of a micro p-n junction between TiO₂ and ZnO, which enhanced electron-hole separation and reduced recombination rates. ZnO nanorods on ZnO inverse opals demonstrated overall higher activity, benefiting from their increased surface area and charge transport properties. These findings highlight ZnO-based photocatalysts as promising for the degradation of various pollutants, demonstrating potential for environmental remediation applications.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"163 ","pages":"Article 116989"},"PeriodicalIF":3.8,"publicationDate":"2025-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143739007","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Infrared emission characteristics research of Er3+ and Pr3+ ions doped YSAG single crystal fibers","authors":"Xinyu Wang ,&nbsp;Jiawei Guo ,&nbsp;You Wang ,&nbsp;Yang Yu ,&nbsp;Long Tian ,&nbsp;Shuyan Song ,&nbsp;Fanming Zeng ,&nbsp;Jing Feng ,&nbsp;Hongjie Zhang","doi":"10.1016/j.optmat.2025.116983","DOIUrl":"10.1016/j.optmat.2025.116983","url":null,"abstract":"<div><div>This study demonstrates that a yttrium aluminum garnet (Y₃Sc₂Al₃O₁₂, YSAG) single crystal fiber (SCF) doped with a specific concentration of Er³⁺ ions and varying concentrations of Pr³⁺ ions was successfully fabricated using the micro-pull-down technique. The fiber produced has a diameter of 3 mm. In this study, the physical and optical properties of the material were studied, conducting a comprehensive X-ray diffraction (XRD) analysis to confirm that the material exhibits a pure phase I_a-3d space group characteristic of YSAG. Subsequently, the thermal expansion behavior of the single crystal fiber was investigated at various doping levels. While the overall trends remained consistent, the specific thermal expansion coefficients and curve gradients exhibited variations among YSAG single crystal fibers with differing dopant concentrations. For the ⁴I_11/2 → ⁴I_13/2 radiation transition of Er³⁺ ions, the peak absorption cross section and peak emission cross section of 0.01 mol% Pr³⁺ ions doped YSAG SCFs are measured to be 6.44 × 10⁻¹⁹ cm² and 6.04 × 10⁻¹⁹ cm², respectively. The peak absorption and emission cross sections of 0.05 mol% Pr³⁺ ions doped YSAG SCFs are measured to be 9.26 × 10⁻¹⁹ cm² and 8.09 × 10⁻¹⁹ cm², respectively. These values represent the highest absorption and emission cross sections obtained in this study. Additionally, the fluorescence lifetimes indicate that at a doping concentration of 0.5 mol% of Pr³⁺ ions, the lifetime difference between the upper and lower energy levels of the 2.7 μm laser is merely 0.09 ms. This observation suggests that Pr³⁺ ions act as an efficient quenching agent within the YSAG SCFs matrix. In the Er³⁺, x mol% Pr³⁺: YSAG (x = 0.01, 0.05, 0.1, 0.3, 0.5) SCFs series, doping with only 0.05 mol% Pr³⁺ ions significantly reduces the fluorescence lifetime difference between the two levels of Er³⁺ ions at the 2.7 μm laser transition from 1.41 ms (in the absence of Pr³⁺ ions) to 0.55 ms. This study provides both a theoretical foundation and empirical data that support the application of Er³⁺, Pr³⁺: YSAG SCFs in laser technology and optical communication.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"163 ","pages":"Article 116983"},"PeriodicalIF":3.8,"publicationDate":"2025-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143760402","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Tetraphenyl ethylene derivatives exhibiting aggregation induced emission enhancement for OLEDs and optical sensors of nitroaromatic explosives","authors":"Santhiya Kuppusamy ,&nbsp;Melika Ghasemi ,&nbsp;Ehsan Ullah Rashid ,&nbsp;Dmytro Volyniuk ,&nbsp;Oleksandr Bezvikonnyi ,&nbsp;Khushdeep Kaur ,&nbsp;Jurate Simokaitiene ,&nbsp;Audrius Bucinskas ,&nbsp;Mariia Stanitska ,&nbsp;Oleksandr Navozenko ,&nbsp;Juozas V. Grazulevicius","doi":"10.1016/j.optmat.2025.116988","DOIUrl":"10.1016/j.optmat.2025.116988","url":null,"abstract":"<div><div>The design, synthesis, and properties of derivatives of tetraphenyl ethylene (TPE) and donor moieties of <em>tert</em>-butylcarbazole and dimethylacridane are described. The targeted compounds are characterized by single crystal X-ray analysis, mass and NMR spectrocopies. With the temperatures of the onsets of thermal decomposition of <em>ca.</em> 450–520 °C, the compounds exhibit remarkably high thermal stability. Density functional theory calculations are employed to investigate the frontier molecular orbitals and charge transfer dynamics between the distinct moieties of the studied compounds. The dimethylacridine derivative exhibits pronounced charge transfer, as elucidated through the experimental study of the solvatochromic effect. The results of the study of the photophysical properties of the dispersions of the compounds in the mixtures of THF and water demonstrate a pronounced aggregation-induced emission enhancement. The applicability of the synthesized compounds for the detection of nitroaromatic explosives is demonstrated, on the example of quenching of their emission by picric acid. The film of <em>tert</em>-butylcarbazolyl-substituted TPE exhibits almost twice photoluminescence quantum yield than a dimethylacridine-based counterpart. Due to this and a suitable energy level of HOMO of −5.43 eV, the derivative of TPE and <em>tert</em>-butylcarbazole is applied as emitter in a sky-blue organic light emitting diode, reaching external quantum efficiency of 1.7 % without doping into a host material.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"163 ","pages":"Article 116988"},"PeriodicalIF":3.8,"publicationDate":"2025-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143726292","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Infrared absorption and laser spectroscopy of Ho3+ doped K2YF5 microparticles","authors":"Pakwan Chanprakhon,&nbsp;Michael F. Reid,&nbsp;Jon-Paul R. Wells","doi":"10.1016/j.optmat.2025.116938","DOIUrl":"10.1016/j.optmat.2025.116938","url":null,"abstract":"<div><div>High-resolution absorption and laser spectroscopy are used to determine electronic energy levels for Ho<span><math><msup><mrow></mrow><mrow><mn>3</mn><mo>+</mo></mrow></msup></math></span> ions in K<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span>YF<span><math><msub><mrow></mrow><mrow><mn>5</mn></mrow></msub></math></span> microparticles. A total of 72 crystal-field energy levels, distributed among 8 multiplets, are assigned. This optical data is used for crystal-field modelling of the electronic structure of Ho<span><math><msup><mrow></mrow><mrow><mn>3</mn><mo>+</mo></mrow></msup></math></span> in K<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span>YF<span><math><msub><mrow></mrow><mrow><mn>5</mn></mrow></msub></math></span>. Partially-resolved hyperfine splittings are accurately reproduced by the model. The temperature dependence of the fluorescent lifetime of the <span><math><msup><mrow></mrow><mrow><mn>5</mn></mrow></msup></math></span>F<span><math><msub><mrow></mrow><mrow><mn>5</mn></mrow></msub></math></span> multiplet is measured and the temperature dependence of the non-radiative relaxation is modelled by a five-phonon process. Preliminary measurements of infra-red to visible upconversion in microparticles co-doped with Ho<span><math><msup><mrow></mrow><mrow><mn>3</mn><mo>+</mo></mrow></msup></math></span> and Yb<span><math><msup><mrow></mrow><mrow><mn>3</mn><mo>+</mo></mrow></msup></math></span> is reported.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"163 ","pages":"Article 116938"},"PeriodicalIF":3.8,"publicationDate":"2025-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143734987","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Overview of laser imprinted refractive index changes and related thermal stability in mid-infrared optical glasses","authors":"Julien Ari ,&nbsp;Yao Heng ,&nbsp;Maxime Cavillon ,&nbsp;Martin Bernier ,&nbsp;Marc Dussauze ,&nbsp;Matthieu Lancry","doi":"10.1016/j.optmat.2025.116985","DOIUrl":"10.1016/j.optmat.2025.116985","url":null,"abstract":"<div><div>Various glass compositions adapted to mid-infrared (heavy metal oxide, fluoride and chalcogenide glasses) were irradiated by femtosecond laser and their refractive index variations characterized as a function of laser pulse energy. Their thermal stability was studied through isochronal annealing conditions in order to determine their erasure temperatures. The measured index variations were compared to values collected from literature for a broad range of glass candidates. Additional chalcogenide glasses studied in this article (e.g. GeSbS and 75GeS₂-15In₂S₃–10CsCl) present very high refractive index variations (up to 5.5·10⁻²), almost 3 times the maximum value reported in heavy metal oxide glasses (2·10⁻², Corning 9754) or SiO₂, bringing interest for the development of mid-infrared optical devices. Nevertheless, they can be limited by their relatively low thermal stability, since the refractive index variations fully erase around their glass transition temperatures (typ. 200–300 °C for chalcogenide glasses studied herein).</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"163 ","pages":"Article 116985"},"PeriodicalIF":3.8,"publicationDate":"2025-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143739133","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Flexible tetra-carboxyphenyl porphyrin thin films for optoelectronic devices: Structural, optical and electrical characteristics","authors":"Fatma Gami ,&nbsp;M.A. Sebak ,&nbsp;M.A.A. Alzara ,&nbsp;Huda G. Alharbi ,&nbsp;Sahar Elnobi ,&nbsp;Amr Attia Abuelwafa","doi":"10.1016/j.optmat.2025.116976","DOIUrl":"10.1016/j.optmat.2025.116976","url":null,"abstract":"<div><div>Electronic devices based on flexible plastic substrates have much attention in the electronics future. A comprehensive analysis was performed to investigate the impact of thickness on vacuum-thermally produced tetra-carboxyphenyl porphyrin (TCPP) thin films on flexible indium tin oxide (ITO)/polyethylene terephthalate (PET) substrates. An X-ray diffraction (XRD) pattern demonstrated that the thin films had an amorphous structure. Atomic force microscopy (AFM) images were exposed, and average roughness (Ra), increased with layer thickness from 2.72 to 4.95 nm. Characteristic vibrations of intermolecular bonds in TCPP were confirmed using Fourier-transform infrared spectroscopy (FT-IR). Optical characterization studies indicated that the thin films exhibited an indirect allowed transition, as determined by the optical band gap (<span><math><mrow><msubsup><mi>E</mi><mi>g</mi><mrow><mi>O</mi><mi>p</mi><mi>t</mi></mrow></msubsup></mrow></math></span>). Furthermore, it was observed that the values of <span><math><mrow><msubsup><mi>E</mi><mi>g</mi><mrow><mi>O</mi><mi>p</mi><mi>t</mi><mspace></mspace></mrow></msubsup></mrow></math></span> was decreased from 2.67 to 2.44 eV as the thickness of the thin films increase from 90 nm to 320 nm. The dispersion parameters at normal dispersion were calculated as a function of film thickness. The calculated third-order nonlinear susceptibility χ ⁽³⁾ and nonlinear refractive index n₂ were found to be in the order of ∼10⁻¹⁰ and∼10⁻⁹ esu, respectively within the photon energy range of 0.5–4 eV. The photoresponse of Au/TCPP/ITO/PET diodes was evaluated under varying illumination conditions, revealing a photoresponsivity of 3.58 A/W, specific detectivity (D∗) of 3.02 × 10¹⁰ Jones, photosensitivity (PS) of 81.63 %, linear dynamic range (LDR) of 5.12 dB and external quantum efficiency of 8.05 % at -1V and 100 mW/cm². Finally, the conduction mechanism of the Au/TCPP/ITO/PET diode was investigated under forward bias voltage conditions. These findings highlight the potential of TCPP/ITO/PET thin films for flexible optoelectronic applications, particularly in nonlinear optical devices and photodiodes.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"163 ","pages":"Article 116976"},"PeriodicalIF":3.8,"publicationDate":"2025-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143714506","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of europium doping on structural, optical and fluorescence lifetime studies of CuS nanostructures","authors":"B. Sree Sesha Sudha Gayatri,&nbsp;N. Madhusudhana Rao","doi":"10.1016/j.optmat.2025.116982","DOIUrl":"10.1016/j.optmat.2025.116982","url":null,"abstract":"<div><div>The purpose of the current study was to examine the impact of varying concentrations of Europium (Eu) atoms on the physical properties of copper sulphide (CuS) nanostructures designed for optical and fluorescence studies. CuS nanostructures were grown using the hydrothermal method and subsequently evaluated their structural, optical, and morphological characteristics. Nanostructures of CuS doped with Eu at levels of 0, 1, 3, 5, and 7 at. % were synthesised. For the purpose of analysing their properties, various characterisation instruments like X-ray diffraction (XRD), Raman, X-ray photoelectron spectroscopy (XPS), UV–Vis, photoluminescence, and FESEM were utilised. Chemical states were analysed using XPS. The XRD analysis of CuS revealed its hexagonal structure in the covellite phase and samples doped with Eu showed an increment in crystallite size. Eu-doped CuS nanostructures exhibit bandgap increment with the introduction of doping. FESEM analysis reveals the formation of flower-like structures resembling spheres, while lower magnification identifies the presence of nanoflakes. Room-temperature photoluminescence analysis was performed utilising a fluorescence spectrophotometer, revealing orange-red emission peaks at an excitation wavelength of 350 nm. The colour-correlation temperature (CCT) and colour index of extinction (CIE) values of the synthesised samples indicate significant potential for application in display technology. The analysis of fluorescence lifetime and decay in CuS nanostructures doped with Eu was validated through fluorescence lifetime measurements, indicating that the Eu dopant serves as a fluorescence-enhancing agent. Their unique luminescent properties, particularly the strong red emission, suggest potential applications in red-emitting phosphors, white LEDs, high-energy batteries, and supercapacitors.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"163 ","pages":"Article 116982"},"PeriodicalIF":3.8,"publicationDate":"2025-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143714406","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Systematic analysis of nonlinear optical properties in pristine and rare-earth-doped Zn2V2O7 for low-power optical limiting applications","authors":"Haritha J ,&nbsp;Mani Rahulan K ,&nbsp;N. Angeline Little Flower ,&nbsp;T. Sharmila ,&nbsp;Sabari Girisun T C ,&nbsp;Annie Sujatha R","doi":"10.1016/j.optmat.2025.116974","DOIUrl":"10.1016/j.optmat.2025.116974","url":null,"abstract":"<div><div>This study focuses on the optical limiting (OL) as well as, nonlinear optical (NLO), properties of pristine and rare-earth (RE) doped zinc pyrovanadate (Zn₂V₂O₇), were systematically investigated through the Z-scan method operated at 532 nm wavelength within the nanosecond domain. RE-doped Zn₂V₂O₇ nanoparticles, where RE = Nd, Er, and Eu, are prepared through the hydrothermal method, and their structural, morphological, and optical properties are studied in detail. The X-ray diffraction studies describe the structure information and surface morphology it exhibits as revealed by scanning electron microscopy. The molecular structures and chemical bonding have been confirmed using Raman spectroscopy and Fourier-transform infrared spectroscopy. The linear absorption studies revealed decreased band gap energy upon doping with RE elements. Nonlinear optical studies conducted using the open-aperture (OA) Z-scan method showed that all the samples exhibited reverse saturable absorption (RSA) behavior through a mechanism involving the simultaneous absorption of two photons. Contrary to the pristine Zn₂V₂O₇, the OL and NLO behavior of the RE-doped samples are strongly enhanced. Among the materials under study, Eu-doped Zn₂V₂O₇ revealed the highest nonlinear optical absorption with better optical limiting performance compared to Nd and Er doping. These findings indicate that Eu-doped Zn₂V₂O₇ can be considered as a material with potential applications in low-power optical limiting devices due to its enhanced optical limiting characteristics and effective nonlinear absorption.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"163 ","pages":"Article 116974"},"PeriodicalIF":3.8,"publicationDate":"2025-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143739008","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The stability of polymethylphenylsiloxane varnish modified with SiO2 nanoparticles and exposed to solar spectrum quanta","authors":"Mikhail M. Mikhailov,&nbsp;Vladimir A. Goronchko,&nbsp;Semyon A. Yuryev,&nbsp;Alexey N. Lapin,&nbsp;Dmitriy S. Fedosov,&nbsp;Svetlana P. Ivanichko","doi":"10.1016/j.optmat.2025.116980","DOIUrl":"10.1016/j.optmat.2025.116980","url":null,"abstract":"<div><div>The article is focused on the effect of modification with silicon dioxide nanoparticles on the stability of polymethylphenylsiloxane varnish exposed to solar spectrum quanta. The modification was carried out within 0.1–10 wt % of SiO₂ by mixing the varnish with toluene and nanopowder and by subsequent application of ultrasonic waves in order to obtain the even distribution of nanoparticles. The irradiation was performed using a xenon arc lamp with the intensity 3 times higher than solar radiation. The analysis included studying the diffuse reflectance spectra within 0.2–2.5 μm; the optical absorption edge; the solar absorptance; FTIR and XRD spectra obtained after modifying and irradiating the samples; the adhesion of the samples to the aluminum-magnesium alloy substrate. Irradiation of the varnish leads to the appearance of integral absorption band from 295 to 700 nm, which is determined by the radicals formed by irradiation upon after breaking of the chemical bonds Si–Si, Si–C, C–C, C–O, CH₂–H, C–H, and Si–O. The results allowed for determining the optimal concentration value for SiO₂ nanoparticles that provides a 1.3-fold increase in the photostability of optical properties. The resulting modified varnishes can be used to develop thermal control coatings for spacecraft and photostable coatings for solar industry.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"163 ","pages":"Article 116980"},"PeriodicalIF":3.8,"publicationDate":"2025-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143714501","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}