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High Temperature Inhibits Light-induced Phase Separation of All-inorganic Halogen Perovskite CsPbBrxCl3-x 高温抑制全无机卤素钙钛矿CsPbBrxCl3-x光致相分离
IF 3.3 3区 材料科学 Q3 CHEMISTRY, PHYSICAL Pub Date : 2025-08-06 DOI: 10.1007/s12633-025-03430-4
Yingqiang Sun, Shenwei Wang, Wenlu Deng, Lixin Yi

Metal halide perovskites (MHPs) have garnered significant attention as promising luminescent candidates due to their tunable band gaps, high color purity with narrow emission linewidths, high carrier mobility, and high photoluminescence quantum yield (PLQY). To date, red and green perovskite light-emitting diodes (LEDs) have achieved remarkable efficiency, boasting external quantum efficiencies (EQEs) exceeding 20%. In contrast, blue perovskite LEDs have fallen behind in terms of both efficiency and stability, which poses a significant barrier to their application in lighting and display. Currently, a straightforward strategy for achieving blue light emission in perovskites involves using thin-film devices with a tunable bandgap based on a mixture of chlorine (Cl) and bromine (Br) halogens. However, this approach is challenged by phase separation under the influence of light and electric fields. In this study, we tackle the critical issue of phase separation by light-induced in hybrid halide perovskites. Furthermore, we demonstrate the spectrally stable in blue perovskite films with a broad emission wavelength range of 428 to 452 nm by introducing a simple and practical method that involves annealing all-inorganic halogen perovskite films in air at high temperatures. This temperature (350 °C) is much higher than the annealing temperature common in the current literature (80–120 °C). Moreover, we used N-type silicon with superior thermal conductivity as the substrate. Silicon with superior thermal conductivity not only mitigates the adverse effects in low-conductivity glass substrates at elevated temperatures, but also facilitates direct device integration for future applications. This high-temperature annealing process reduces grain boundaries and defect density, thereby inhibiting the migration of halogen ions and effectively preventing phase separation.

金属卤化物钙钛矿(MHPs)由于其可调的带隙、高色纯度、窄发射线宽、高载流子迁移率和高光致发光量子产率(PLQY)而成为有前途的发光材料,受到了广泛的关注。迄今为止,红色和绿色钙钛矿发光二极管(led)已经取得了显着的效率,其外部量子效率(EQEs)超过20%。相比之下,蓝色钙钛矿led在效率和稳定性方面都落后,这对其在照明和显示方面的应用构成了重大障碍。目前,在钙钛矿中实现蓝光发射的一种直接策略是使用基于氯(Cl)和溴(Br)卤素混合物的可调带隙薄膜器件。然而,这种方法受到光和电场影响下相分离的挑战。在这项研究中,我们解决了光诱导混合卤化物钙钛矿相分离的关键问题。此外,我们通过引入一种简单实用的方法,在高温下在空气中退火全无机卤素钙钛矿薄膜,证明了蓝钙钛矿薄膜在428 ~ 452nm宽发射波长范围内的光谱稳定性。这个温度(350°C)比当前文献中常见的退火温度(80-120°C)高得多。此外,我们还采用了导热性能优异的n型硅作为衬底。具有优异导热性的硅不仅减轻了高温下低导电性玻璃基板的不利影响,而且还促进了未来应用的直接器件集成。这种高温退火工艺降低了晶界和缺陷密度,从而抑制了卤素离子的迁移,有效地防止了相分离。
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引用次数: 0
Design and Optimization of a Thermally Tunable Vanadium Dioxide-Based Metasurface Optical Switch for Mid-Infrared Applications 用于中红外应用的热可调谐二氧化钒超表面光开关的设计与优化
IF 3.3 3区 材料科学 Q3 CHEMISTRY, PHYSICAL Pub Date : 2025-08-04 DOI: 10.1007/s12633-025-03425-1
Abida Parveen, Ahsan Irshad,  Um-e-Kalsoom, Deepika Tyagi, Mehboob Alam, Ali Kazim, Faisal Ahmad, Keyu Tao, Zhengbiao Ouyang

Ultrafast all-optical switching plays a critical role in the advancement of optical signal processing and sensing technologies, enabling high-speed, energy-efficient data transmission and real-time environmental monitoring. Recent progress in novel materials and structural innovations has significantly improved switching speed and efficiency. However, current designs often face challenges such as limited modulation depth, slow response times, reduced bandwidth, and a lower Extinction Ratio (ER). This work introduces a metamaterial-based optical switch that harnesses the insulator-to-metal phase transition of vanadium dioxide ((VO_2)) to overcome these challenges. The optical switch operates within the mid-infrared range (5.4-7 (mu m)), achieving a remarkable 97% absorption in the high state and just 10% in the low state. This performance delivers an outstanding ON / OFF contrast ratio of 9.7 and an extinction ratio of 37.45 dB. The innovative integration of a patterned (VO_2) layer with (SiO_2) and Cr substrates ensures precise resonant coupling and enables rapid modulation with sub-picosecond switching times (1.27 ps). By overcoming the limitations of previous designs, this switch offers high-speed, tunable optical performance with enhanced bandwidth, making it highly suitable for next-generation infrared sensors, reconfigurable photonic circuits, and high-speed optical communication systems. Its ability to achieve ultrafast modulation and strong contrast makes it a promising device for advanced infrared sensing, optical imaging, and environmental monitoring applications.

超快全光交换在光信号处理和传感技术的进步中起着至关重要的作用,实现了高速、节能的数据传输和实时环境监测。新材料和结构创新的最新进展显著提高了开关的速度和效率。然而,目前的设计经常面临诸如有限的调制深度、缓慢的响应时间、减少的带宽和较低的消光比(ER)等挑战。这项工作介绍了一种基于超材料的光开关,它利用二氧化钒的绝缘体到金属的相变((VO_2))来克服这些挑战。光开关在中红外范围内工作(5.4-7 (mu m)),实现了显着的97% absorption in the high state and just 10% in the low state. This performance delivers an outstanding ON / OFF contrast ratio of 9.7 and an extinction ratio of 37.45 dB. The innovative integration of a patterned (VO_2) layer with (SiO_2) and Cr substrates ensures precise resonant coupling and enables rapid modulation with sub-picosecond switching times (1.27 ps). By overcoming the limitations of previous designs, this switch offers high-speed, tunable optical performance with enhanced bandwidth, making it highly suitable for next-generation infrared sensors, reconfigurable photonic circuits, and high-speed optical communication systems. Its ability to achieve ultrafast modulation and strong contrast makes it a promising device for advanced infrared sensing, optical imaging, and environmental monitoring applications.
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引用次数: 0
Correction to: Multiplexer based all-optical NOR, NAND, XNOR and XOR gates using silicon microring resonator: Design and analysis 修正:基于多路复用器的全光NOR, NAND, XNOR和XOR门使用硅微环谐振器:设计和分析
IF 3.3 3区 材料科学 Q3 CHEMISTRY, PHYSICAL Pub Date : 2025-08-04 DOI: 10.1007/s12633-025-03424-2
Selvakumarasamy Kathirvelu, Somasundaram Kasiviswanathan, Chidambarathanu Krishnan, Sultan Mahaboob Basha, Manjur Hossain
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引用次数: 0
HVOF-Sprayed Silicon Carbide-Enhanced TiO₂ Cermet Coatings for Titanium Alloys: A Study on Solid Particle Erosion Behavior hvof喷涂碳化硅增强钛合金tio2金属陶瓷涂层:固体颗粒侵蚀行为研究
IF 3.3 3区 材料科学 Q3 CHEMISTRY, PHYSICAL Pub Date : 2025-08-02 DOI: 10.1007/s12633-025-03422-4
R. Sathiyamoorthy, Thirumalaikumarasamy Duraisamy, Ashokkumar Mohankumar

Titanium and its alloys are extensively utilized in aggressive environments like aviation and power generation sectors, where surface degradation through erosion plays a critical role in component performance and life. For this present study, TiO₂-SiC cermet coatings were coated on Ti base substrate using the High-Velocity Oxy-Fuel (HVOF) spraying technique with varying SiC reinforcement levels—uncoated alloy (Ti), TiO₂ coatings (T0), 5 wt.% SiC (T5), 10 wt.% SiC (T10), and 15 wt.% SiC (T15)—with the aim of improving erosion-resistant of the deposit. The coatings were examined through the solid particle erosion testing with considering the effect of particle velocity, particle flux rate, and impingement angle impacts on the erosion behavior of the coatings. Microstructural inspection showed a monotonic decrease in porosity from 6.4 vol.% of T0 to 2.1 vol.% for T10, accompanied by the corresponding increase in microhardness from 612 HV₀.₃ to 856 HV₀.₃. The T10 coating, specifically, showed better erosion resistance, with erosion rates decreased by 60.4% (from 0.48 mg/g to 0.19 mg/g) at 100 m/s particle velocity, 47.4% (from 2.75 mg/g to 2.22 mg/g) at an impingement angle of 90°, and 67.3% (from 0.55 mg/g 0.18 mg/g) at a particle flux of 5 g/m, as compared to T0. In addition, Atomic Force Microscopy (AFM) validated a denser and smoother surface with roughness reduced from 5.3 µm (T0) to 2.9 µm (T10). These results prove that TiO₂-SiC HVOF-sprayed coatings, when sprayed with optimized SiC reinforcement and spray parameters, improve erosion resistance, mechanical performance, and surface integrity substantially, and are hence ideal for high-temperature and erosive service applications.

钛及其合金广泛应用于航空和发电等恶劣环境中,在这些环境中,表面腐蚀对部件的性能和寿命起着至关重要的作用。在本研究中,使用高速氧燃料(HVOF)喷涂技术在Ti基基上涂覆tio_2 -SiC金属涂层,并具有不同的SiC增强水平-未涂覆合金(Ti), tio_2涂层(T0), 5wt .% SiC (T5), 10wt .% SiC (T10)和15wt .% SiC (T15) -旨在提高镀层的耐腐蚀性。通过固体颗粒冲蚀试验,考察了颗粒速度、颗粒通量和冲击角对涂层冲蚀性能的影响。显微组织检查表明,孔隙率从T0的6.4 vol.%单调下降到T10的2.1 vol.%,伴随着显微硬度从612 HV 0相应增加。₃到856 HV₀₃。其中,T10涂层表现出更好的抗冲蚀性能,在100 m/s颗粒速度下,与T0相比,冲蚀率下降了60.4%(从0.48 mg/g降至0.19 mg/g),在90°冲击角下,冲蚀率下降了47.4%(从2.75 mg/g降至2.22 mg/g),在5 g/m颗粒流速下,冲蚀率下降了67.3%(从0.55 mg/g降至0.18 mg/g)。此外,原子力显微镜(AFM)验证了更致密、更光滑的表面,粗糙度从5.3µm (T0)降低到2.9µm (T10)。这些结果证明,当采用优化的SiC增强剂和喷涂参数喷涂时,tio_2 -SiC hvof喷涂涂层可以显著提高抗侵蚀性能、机械性能和表面完整性,因此是高温和腐蚀性应用的理想选择。
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引用次数: 0
Nanoengineered Triple Material Gate Nanosheet MOSFETs for Advanced SARS-CoV-2 Biosensing 用于新型冠状病毒生物传感的纳米工程三重材料栅极纳米片mosfet
IF 3.3 3区 材料科学 Q3 CHEMISTRY, PHYSICAL Pub Date : 2025-08-02 DOI: 10.1007/s12633-025-03410-8
E. Rajalakshmi, N. B. Balamurugan, M. Suguna, D. Sriram Kumar

Silicon based biosensors have emerged as a promising solution for real-time virus detection due to their high sensitivity and scalability. A new Triple Material Gate Nanosheet (TMGNS) MOSFETs-based biosensor for extremely sensitive SARS-CoV-2 detection is presented in this work for the first time. The suggested TMGNS MOSFETs enhances detection sensitivity and charge modulation by utilizing the special benefits of nanosheet MOSFETs, including improved electrostatic control, a high surface-to-volume ratio, and decreased short-channel effects. In this work, the S-protein and complementary DNA (c-DNA) of SARS-CoV-2 are two viral biomarkers that may be precisely detected. The device's exceptional performance is confirmed by Technology Computer-Aided Design (TCAD) simulations, which show notable threshold voltage shifts and drain current modulation in response to changes in the dielectric constant of biomolecules. The proposed biosensor has a quick response time of 4 ps and a high drain current sensitivity of 3.5 × 106 at k = 12. It is appropriate for real-time viral detection due to its 10% improvement in the ION/IOFF ratio and 6% improvement in subthreshold swing. Additionally, robust performance is confirmed by sensitivity analysis under various biomolecular charge densities, with a 22% improvement in threshold voltage for k = 12. A scalable, low-power, and highly effective method for identifying SARS-CoV-2 and other emerging viruses, the silicon based TMGNS MOSFETs is positioned as a prospective contender for next-generation point-of-care diagnostic applications due to its improved electrostatic coupling and charge sensing capabilities.

硅基生物传感器由于其高灵敏度和可扩展性而成为实时病毒检测的一种有前途的解决方案。本文首次提出了一种新型的三材料栅极纳米片(TMGNS) mosfet生物传感器,用于高度灵敏的SARS-CoV-2检测。所提出的TMGNS mosfet通过利用纳米片mosfet的特殊优势,包括改进的静电控制、高表面体积比和减少的短通道效应,提高了检测灵敏度和电荷调制。在这项工作中,SARS-CoV-2的s蛋白和互补DNA (c-DNA)是两个可以精确检测的病毒生物标志物。技术计算机辅助设计(TCAD)模拟证实了该器件的卓越性能,该器件显示出明显的阈值电压偏移和漏极电流调制,以响应生物分子介电常数的变化。所提出的生物传感器在k = 12时具有4 ps的快速响应时间和3.5 × 106的高漏极电流灵敏度。它适合实时病毒检测,因为它的离子/ off比提高了10%,亚阈值摆动提高了6%。此外,在不同生物分子电荷密度下的灵敏度分析证实了其稳健的性能,k = 12时阈值电压提高了22%。硅基TMGNS mosfet是一种可扩展、低功耗、高效的方法,可用于识别SARS-CoV-2和其他新出现的病毒,由于其改进的静电耦合和电荷传感能力,它被定位为下一代即时诊断应用的潜在竞争者。
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引用次数: 0
Preparation of Zwitterionic Polycarboxylate Dispersant and its Influence on Rheological Properties and Dispersion Mechanism of Oil Well Cement 两性离子聚羧酸酯分散剂的制备及其对油井水泥流变性能和分散机理的影响
IF 3.3 3区 材料科学 Q3 CHEMISTRY, PHYSICAL Pub Date : 2025-08-02 DOI: 10.1007/s12633-025-03417-1
Xuejie Li, Zhigang Peng, Qian Feng, Yong Zheng, Xiaofeng Zhang, Haojun Zhang, Yu Long, Yunao Zhang, Jun Zhou

To address the excessive retardation of oil well cement caused by polycarboxylate dispersants (PCE), this study synthesized a zwitterionic polycarboxylate dispersant (DPC). Its molecular structure and weight were characterized using 1H nuclear magnetic resonance and gel permeation chromatography, respectively. The dispersion effect of DPC in cement slurries was evaluated by analyzing microstates, particle size distribution, Zeta potential, and rheological properties, and compared with acetone formaldehyde sulfite condensates (AFS) and conventional anionic polycarboxylate dispersants (CPC). The influence of DPC on cement hydration was studied through thickening performance, compressive strength, semi-adiabatic calorimetry, and X-ray diffraction. DPC effectively disrupted particle flocculation in cement slurry, reducing the median particle size from 34.4 μm to 10.2 μm. At a dosage of 0.20%, the slurry with DPC exhibited superior flowability compared to CPC and AFS. DPC induced Newtonian fluid behavior with weaker thixotropy and significantly reduced retardation effects. The 24-h compressive strength of cement stones reached 39.7 MPa, the thickening time was about 83 min, and the hydration heat peak occurred earlier. Adsorption studies indicated that DPC disperses through steric hindrance and the synergistic anchoring effects of cations and anions. Overall, DPC demonstrates high dispersibility and lower retardation, making it a promising additive for oil and gas well cementing.

为解决聚羧酸酯分散剂(PCE)对油井水泥缓凝作用过大的问题,合成了两性离子聚羧酸酯分散剂(DPC)。用1H核磁共振和凝胶渗透色谱对其分子结构和质量进行了表征。通过分析DPC在水泥浆中的微观状态、粒径分布、Zeta电位和流变性能来评价DPC在水泥浆中的分散效果,并与丙酮甲醛亚硫酸盐凝聚体(AFS)和常规阴离子聚羧酸酯分散剂(CPC)进行比较。通过增稠性能、抗压强度、半绝热量热法和x射线衍射研究了DPC对水泥水化的影响。DPC有效地破坏了水泥浆中的颗粒絮凝,将中位粒径从34.4 μm降低到10.2 μm。掺量为0.20%时,DPC浆体的流动性优于CPC浆体和AFS浆体。DPC诱导牛顿流体行为,触变性较弱,延迟效应显著降低。水泥石24h抗压强度达到39.7 MPa,稠化时间约为83 min,水化热峰出现时间提前。吸附研究表明,DPC通过空间位阻和阳离子、阴离子的协同锚定作用进行分散。总体而言,DPC具有高分散性和低缓凝性,是一种很有前景的油气井固井添加剂。
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引用次数: 0
Parametric Study and Characterization of SiC—TiC—Al Composite Coatings Fabricated on Al 6061 Alloy by TIG Cladding Process TIG熔覆Al 6061合金SiC-TiC-Al复合涂层的参数研究与表征
IF 3.3 3区 材料科学 Q3 CHEMISTRY, PHYSICAL Pub Date : 2025-08-01 DOI: 10.1007/s12633-025-03418-0
Pritam Paul, Subrata Kumar Ghosh, Rahul Kanti Nath, Pabitra Maji, R. K. Bhogendro Meitei

SiC—TiC—Al composite coatings were successfully deposited by preplacing paste of SiC, TiC and Al powder mixture on aluminum 6061 alloy substrate by TIG cladding process. The effect of process parameters on microstructure, microhardness and wear properties of the coatings was investigated by SEM and XRD, Vickers microhardness tester, and pin-on-disc type dry sliding wear tester respectively. The analysis demonstrated that the microstructure, microhardness and wear behaviour of the SiC—TiC—Al coatings were influenced by heat input, which was varied by different parametric combinations of current and scan speed during cladding. XRD result revealed the presence of Al, TiC and formation of compound such as Al4SiC4, which enhanced the microhardness values of the clad layers such that, the microhardness of the cladded surface was observed up to 168 HV0.05, which was more than three times that of the substrate material. The developed coatings showed up to 4 times less in the wear loss value; under sliding abrasive conditions compared to the uncoated Al 6061 alloy, which validated the composite coating as a suitable option for the components requiring wear resistance.

采用TIG熔覆工艺,在6061铝合金基体上制备了SiC、TiC和Al粉末混合物的预糊状物,成功地沉积了SiC - TiC - Al复合涂层。采用扫描电镜(SEM)、x射线衍射仪(XRD)、维氏显微硬度仪(Vickers显微硬度计)和销盘式干滑动磨损仪(pin-on-disc)分别研究了工艺参数对涂层显微组织、显微硬度和磨损性能的影响。分析表明,热输入对SiC-TiC-Al涂层的显微组织、显微硬度和磨损性能有一定的影响,而热输入又受熔覆过程中不同电流和扫描速度参数组合的影响。XRD结果表明,包覆层中Al、TiC的存在以及Al4SiC4等化合物的形成提高了包覆层的显微硬度值,包覆层表面的显微硬度高达168 HV0.05,是基体材料的3倍以上。该涂层的磨损损失值降低了1 / 4;与未涂层的Al 6061合金相比,在滑动磨损条件下,复合涂层是需要耐磨性的部件的合适选择。
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引用次数: 0
Silicon Dioxide Functionalized with Benzimidazole: A Versatile Dual-Function Sensor and Enhanced Antimicrobial Agent 苯并咪唑功能化二氧化硅:一种多功能双功能传感器和增强抗菌剂
IF 3.3 3区 材料科学 Q3 CHEMISTRY, PHYSICAL Pub Date : 2025-08-01 DOI: 10.1007/s12633-025-03421-5
HaoTang, Xue Xia, Kanagaraj Rajalakshmi, Jian Shen, K. Jayamoorthy, Selvaraj Muthusamy, Dongwei Zhu, Xiaojian Liu, R. Sasikala

This study explores the intriguing interaction between 1-(4-bromobenzyl)-2-(4-bromophenyl)-4-fluoro-1H-benzo[d]imidazole (BBFB) and silicon dioxide (SiO2) nanoparticles, unveiling how functionalization enhances both the photophysical properties and antimicrobial efficacy of BBFB. Through absorption, fluorescence, and FT-IR spectroscopy, it is revealed that BBFB undergoes strong adsorption onto the surface of SiO2nanoparticles, primarily driven by electron transfer interactions. The fluorescence quenching observed in BBFB is attributed to photo-induced electron transfer from the excited state of BBFB to the conduction band of SiO2 nanoparticles. Functionalization of BBFB with SiO2 nanoparticles significantly enhances its biocidal activity. Antibacterial assays indicate that the BBFB-functionalized SiO2 nanoparticles exhibit superior efficacy against Staphylococcus aureus and Salmonella typhi, compared to unmodified BBFB. In antifungal testing, BBFB-functionalized SiO2 nanoparticles also demonstrate improved performance against Aspergillus flavus and Candida albicans. The study highlights the potential of BBFB-functionalized SiO2 nanoparticles as a promising antimicrobial agent, offering enhanced biological activity, reduced reaction times in synthesis, and improved efficiency, thus presenting a viable, eco-friendly alternative for various pharmaceutical applications.

本研究探讨了1-(4-溴苯基)-2-(4-溴苯基)-4-氟- 1h -苯并咪唑(BBFB)与二氧化硅(SiO2)纳米颗粒之间的相互作用,揭示了功能化如何增强BBFB的光物理性质和抗菌功效。通过吸收光谱、荧光光谱和红外光谱分析,发现BBFB在sio2纳米颗粒表面发生了强吸附,主要是由电子转移相互作用驱动的。在BBFB中观察到的荧光猝灭归因于光诱导电子从BBFB的激发态转移到SiO2纳米颗粒的导带。二氧化硅纳米颗粒功能化BBFB后,其杀菌活性显著提高。抗菌实验表明,与未修饰的BBFB相比,BBFB功能化的SiO2纳米颗粒对金黄色葡萄球菌和伤寒沙门氏菌的抗菌效果更佳。在抗真菌测试中,bbfb功能化SiO2纳米颗粒对黄曲霉和白色念珠菌的抗真菌性能也有所提高。该研究强调了bbfb功能化SiO2纳米颗粒作为一种有前途的抗菌剂的潜力,它具有增强的生物活性、缩短的合成反应时间和提高的效率,从而为各种药物应用提供了可行的、环保的替代品。
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引用次数: 0
Preparation and Modulation of the Morphological, Structural, Electrical, Dielectric and Linear/Nonlinear Optical Characteristics of PVA-PVP/SiC-Bi2O3 Nancomposites for Energy Storage Devices and Radiation Attenuation PVA-PVP/SiC-Bi2O3纳米复合材料的制备及其形态、结构、电学、介电和线性/非线性光学特性的调制
IF 3.3 3区 材料科学 Q3 CHEMISTRY, PHYSICAL Pub Date : 2025-07-31 DOI: 10.1007/s12633-025-03414-4
Jassim M. AL-Issawe, Majeed Ali Habeeb, Ali R. Abdulridha
<div><p>This study aims to develop advanced polymer nanocomposites with enhanced optical, electrical, and mechanical properties for potential use in flexible electronics and radiation shielding.A polymer blend of polyvinyl alcohol (PVA) and polyvinylpyrrolidone (PVP) was reinforced with varying concentrations of silicon carbide (SiC) and bismuth oxide (Bi₂O₃) nanoparticles. The incorporation of these fillers significantly improved the dielectric properties, electrical conductivity, and nonlinear optical behavior of the nanocomposites. The present research tested the optical, structural, morphological, pressure sensor and gamma shielding characteristics of (PVA–PVP/SiC-Bi<sub>2</sub>O<sub>3</sub>) nanocomposites. The blended homog enous nanoparticle distribution, which forms a unified network across the polymer matrix, is shown in the optical microscope photos. The findings of optical characteristics reveal that absorbance, absorption coefficient, refractive index, dielectric constant (both real and imaginary), and optical conductivity exhibit an upward trend with increasing concentrations of (SiC-Bi<sub>2</sub>O<sub>3</sub>) nanoparticles. At the same time, the transmittance of the nanocomposites decreases as the concentration of nanoparticles increases. The band gaps of (PVA–PVP/SiC-Bi<sub>2</sub>O<sub>3</sub>) polymer nanocomposites decrease from 5.65 to 2.66 eV for allowed transitions as well as from 5.43 to 2.01 eV for disallowed transitions with an increase in (SiC- Bi<sub>2</sub>O<sub>3</sub>) nanoparticles concentration. The dispersion of energy (E<sub>d</sub>), average oscillator strength (S<sub>o</sub>), and single-oscillator energy (E<sub>oso</sub>) all decrease as the concentration of nanoparticles increases. Conversely, the Urbach tail energy (E<sub>u</sub>), linear susceptibility (χ<sup>(1)</sup>), nonlinear susceptibility (χ<sup>(3)</sup>), nonlinear refractive index (n<sub>2</sub>), average oscillator parameter (λ<sub>o</sub>), zero-frequency dielectric constant (ε<sub>o</sub>), and zero-frequency refractive index (n<sub>o</sub>) increase. The electrical properties indicate that the dielectric constant (ɛ'), dielectric loss (<b>ε</b>"), and electrical conductivity increase as the concentration of nanoparticles increases. The results demonstrate that the (PVA–PVP/SiC-Bi<sub>2</sub>O<sub>3</sub>) nanostructured films exhibit outstanding electrical and optical properties, making them promising candidates for electronic devices and optical nanotechnology applications. The outcomes of the pressure sensor evaluation indicate that (PVA–PVP/SiC- Bi<sub>2</sub>O<sub>3</sub>) nanostructures exhibit superior environmental stability, outstanding mechanical flexibility, and exceptional pressure sensitivity compared to other sensor materials. When gamma rays expose the (PVA–PVP/SiC-Bi<sub>2</sub>O<sub>3</sub>) PNC films, they exhibit remarkably high decay coefficients. This nanocomposite shows excellent promise as a suitable material for flexibl
本研究旨在开发具有增强光学、电学和机械性能的先进聚合物纳米复合材料,用于柔性电子和辐射屏蔽。用不同浓度的碳化硅(SiC)和氧化铋(Bi₂O₃)纳米颗粒增强了聚乙烯醇(PVA)和聚乙烯吡咯烷酮(PVP)的聚合物共混物。这些填料的掺入显著改善了纳米复合材料的介电性能、电导率和非线性光学性能。本研究测试了(PVA-PVP /SiC-Bi2O3)纳米复合材料的光学、结构、形态、压力传感器和伽马屏蔽特性。光学显微镜照片显示,混合均匀的纳米颗粒分布在聚合物基体上形成统一的网络。光学特性的研究结果表明,随着(SiC-Bi2O3)纳米颗粒浓度的增加,吸光度、吸收系数、折射率、介电常数(实、虚)和光电导率均呈上升趋势。同时,随着纳米粒子浓度的增加,复合材料的透光率降低。随着(SiC- Bi2O3)纳米粒子浓度的增加,(PVA-PVP /SiC-Bi2O3)聚合物纳米复合材料的禁带从5.65 eV减小到2.66 eV,从5.43 eV减小到2.01 eV。随着纳米粒子浓度的增加,能量色散(Ed)、平均振子强度(So)和单振子能量(Eoso)均降低。相反,Urbach尾能(Eu)、线性磁化率(χ(1))、非线性磁化率(χ(3))、非线性折射率(n2)、平均振荡器参数(λo)、零频率介电常数(εo)和零频率折射率(no)增加。电学性质表明,随着纳米颗粒浓度的增加,介电常数、介电损耗和电导率均增加。结果表明,(PVA-PVP /SiC-Bi2O3)纳米结构薄膜具有优异的电学和光学性能,使其成为电子器件和光学纳米技术应用的有希望的候选者。压力传感器评估结果表明,与其他传感器材料相比,(PVA-PVP /SiC- Bi2O3)纳米结构具有优越的环境稳定性,突出的机械灵活性和优异的压力敏感性。当伽马射线照射PNC (PVA-PVP /SiC-Bi2O3)薄膜时,它们表现出非常高的衰减系数。这种纳米复合材料作为柔性纳米器件的合适材料,具有良好的应用前景。
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引用次数: 0
Silicon-Modified Electrochemical Sensing and Drug Delivery Platform for Sensitive Dex Detection and Prevention of Postoperative Cognitive Dysfunction 硅修饰的电化学传感和给药平台用于灵敏Dex检测和预防术后认知功能障碍
IF 3.3 3区 材料科学 Q3 CHEMISTRY, PHYSICAL Pub Date : 2025-07-30 DOI: 10.1007/s12633-025-03396-3
Hongquan Ren, Yuan Cao, Minna Hou, Jiao Guo

Postoperative cognitive dysfunction (POCD) is a frequent neuroinflammatory complication in elderly patients, and dexmedetomidine has shown potential in reducing its incidence by modulating the CX3CL1/CX3CR1 signaling pathway. In this study, carboxymethyl chitosan (CMCS) was chemically modified with a silicon-based polymer (CPTMS) and a natural extract (compound 2) to construct a functionalized carrier material, CPTMS-CMCS-2. This hybrid platform was subsequently loaded with compound 1 and dexamethasone (Dex), yielding the electroactive nanocomposite CPTMS-CMCS-2@1@Dex. Electrochemical characterization revealed that the incorporation of π-conjugated structures and bioactive components enhanced the redox activity, electron transfer efficiency, and surface conductivity of the material, which are beneficial for stimuli-responsive drug release. A POCD rat model was established via abdominal surgery, followed by cognitive assessment using the Morris water maze and analysis of hippocampal CX3CL1 mRNA expression. The results showed that intervention with CPTMS-CMCS-2@1@Dex significantly improved the spatial learning ability of POCD model rats. This study provides new insights into the pathogenesis of POCD and highlights the potential of electroactive, functionalized polysaccharide-based nanocarriers in enhancing the therapeutic efficacy of dexmedetomidine through responsive delivery systems.

术后认知功能障碍(POCD)是老年患者常见的神经炎症并发症,右美托咪定已显示出通过调节CX3CL1/CX3CR1信号通路降低其发生率的潜力。本研究以硅基聚合物(CPTMS)和天然提取物(化合物2)对羧甲基壳聚糖(CMCS)进行化学修饰,构建了功能化载体材料CPTMS-CMCS-2。该混合平台随后负载化合物1和地塞米松(Dex),得到电活性纳米复合材料CPTMS-CMCS-2@1@Dex。电化学表征表明,π共轭结构和生物活性成分的掺入提高了材料的氧化还原活性、电子传递效率和表面电导率,有利于刺激反应性药物释放。通过腹部手术建立POCD大鼠模型,采用Morris水迷宫评估认知能力,分析海马CX3CL1 mRNA表达。结果表明,CPTMS-CMCS-2@1@Dex干预可显著提高POCD模型大鼠的空间学习能力。该研究为POCD的发病机制提供了新的见解,并强调了电活性、功能化多糖基纳米载体通过响应性递送系统提高右美托咪定治疗效果的潜力。
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