Synthetic Metals最新文献_第3页

Synthesis and characterization of benzo-phenanthridine-based acceptor hosts with enhanced bipolar characteristics for red phosphorescent organic light-emitting diodes 红色磷光有机发光二极管增强双极特性的苯并菲菲啶受体宿主的合成与表征

IF 4.6 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Synthetic Metals

Pub Date : 2026-01-20 DOI: 10.1016/j.synthmet.2026.118082

Ye ji Hyeon , Chul Woong Joo , Baeksang Sung , Hyunji Park , Jonghee Lee , Yun-Hi Kim

Herein, we report the development of highly stable red phosphorescent organic light-emitting diodes (PhOLEDs) that exhibit stable light emission and low efficiency roll-off under high-brightness operation. Typical applications of PhOLEDs include smart phones, TVs, tablets, and automotive displays. Two new acceptor-type host materials, 6-phenyl-3,9-bis(3-(pyridin-3-yl)phenyl)benzo[k]phenanthridine (PBPyP-BPH) and 3-(3,5-di(pyridin-3-yl)phenyl)-6-phenylbenzo[k]phenanthridine (DPyP-BPH) were designed and synthesized based on a highly rigid benzophenanthridine core. Owing to this structural rigidity, the two hosts demonstrated excellent thermal stability with high 5 % weight loss temperatures (T_d,5 %) of 403°C for PBPyP-BPH and 395°C for DPyP-BPH. These high thermal transition temperatures ensure device reliability for automotive applications, even under harsh driving conditions. When utilized in a bipolar mixed-host system with a thermally stable donor, 4,4′,4″-tri(N-carbazolyl)triphenylamine (TCTA), the developed red PhOLEDs (doped with Bis(2-methyldibenzo[f,h]quinoxaline)(acetylacetonate)iridium(III) [Ir(MDQ)₂(acac)], TCTA: PBPyP-BPH and TCTA: DPyP-BPH, achieved high maximum external quantum efficiencies (EQEs) of 17.9 and 17.2 %, respectively with significantly suppressed efficiency roll-offs. These results demonstrate that securing high thermal stability through molecular design, combined with controlling charge balance via device structure optimization, is an effective strategy for realizing high-performance red PhOLEDs.

在此，我们报道了高稳定的红色磷光有机发光二极管（PhOLEDs）的开发，该二极管在高亮度工作下具有稳定的发光和低效率滚降。oled的典型应用包括智能手机、电视、平板电脑和汽车显示器。以高刚性苯并苯胺为核心，设计合成了6-苯基-3,9-双（3-（吡啶-3-基）苯基）苯并[k]菲并啶（pbypp - bph）和3-（3,5-二（吡啶-3-基）苯基）-6-苯基苯并[k]菲并啶（dypp - bph）两种新型受体型主体材料。由于这种结构刚性，两种基质表现出优异的热稳定性，其失重温度高达5 % (Td,5 %)，pbypp - bph为403°C， dypp - bph为395°C。即使在恶劣的驾驶条件下，这些高热转变温度也确保了汽车应用中器件的可靠性。在具有热稳定供体4,4′，4″-三（N-carbazolyl）三苯胺（TCTA）的双极性混合主体体系中，所开发的红色oled(掺杂双（2-甲基二苯并[f，h]喹啉）（乙酰丙酮）铱（III） [Ir（MDQ)2(acac)]， TCTA: pbypp - bph和TCTA: dpypp - bph）分别获得了17.9%和17.2% %的最大外量子效率（EQEs），效率滚降明显受到抑制。这些结果表明，通过分子设计获得高热稳定性，并通过器件结构优化控制电荷平衡，是实现高性能红色发光二极管的有效策略。

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引用次数: 0

Preparation and investigation of magnetic and thermal properties of Ni0.5Cu0.5-xYbxFe2O4 (X = 0.0, 0.1 & 0.2) nano ferrite for magneto-thermal applications 用于磁热应用的Ni0.5Cu0.5-xYbxFe2O4 （X = 0.0,0.1 & 0.2）纳米铁氧体的制备及磁性和热性能研究

IF 4.6 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Synthetic Metals

Pub Date : 2026-01-13 DOI: 10.1016/j.synthmet.2026.118079

Hanamanta Badiger , B.G. Hegde , Jogada Shivakumar , Shidaling Matteppanavar , Santosh Y. Khatavi

This study reports the successful synthesis of Ni_0.5Cu_0.5-xYb_xFe₂O₄ (x = 0.0, 0.1 and 0.2) (NCYFO) nanoparticles using a low-temperature sol-gel auto-combustion route. The study highlights its comprehensive investigation of the structural, magnetic, thermal, and electrical properties. X-ray diffraction confirmed a single-phase cubic spinel structure. The approach of Rietveld refinement analysis showed the diffracted peaks are well fitted with Bragg’s position. As the doping level increased, lattice constant are increased and crystallite values are decreased from 20 nm to 12 nm. The presence of five Raman modes further validated the cubic spinel structure. Room temperature M-H loops suggesting a weak ferrimagnetic behavior at higher doping level. Dielectric analysis demonstrated Maxwell–Wagner interfacial polarization consistent with Koop’s theory, while complex impedance spectroscopy indicated a non-Debye type of relaxation. Cole-Cole plot exhibits a straight line and followed by a skewed semicircle. The thermal analysis showed minimal weight loss (2.96 %), confirming the high thermal stability imparted by Yb doping. These combined results, particularly the enhanced thermal stability and magnetic behavior suggesting that, NCYFO nano particles are potential for thermal and magnetic applications.

本研究报道了采用低温溶胶-凝胶自燃烧方法成功合成Ni0.5Cu0.5-xYbxFe2O4 (x = 0.0,0.1和0.2)（NCYFO）纳米颗粒。该研究强调了其对结构、磁性、热学和电学性质的全面研究。x射线衍射证实为单相立方尖晶石结构。Rietveld细化分析表明，衍射峰与Bragg位置拟合良好。随着掺杂水平的增加，晶格常数增加，晶值从20 nm降低到12 nm。五种拉曼模式的存在进一步验证了立方尖晶石结构。室温M-H环表明在较高掺杂水平下具有弱铁磁行为。介电分析显示麦克斯韦-瓦格纳界面极化符合Koop理论，而复阻抗谱显示非德拜型弛豫。Cole-Cole图呈现一条直线，然后是一个歪斜的半圆。热分析显示失重最小（2.96 %），证实了Yb掺杂带来的高热稳定性。这些综合结果，特别是增强的热稳定性和磁性行为表明，NCYFO纳米颗粒具有热磁性应用的潜力。

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引用次数: 0

Decreasing dielectric loss of CoAl-LDH by polymerization of intercalated monomer at organic-inorganic interface 用插层单体在有机-无机界面聚合降低煤- ldh的介损

IF 4.6 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Synthetic Metals

Pub Date : 2026-01-12 DOI: 10.1016/j.synthmet.2026.118080

Fatima Zahra Bouragba, Abdelmonim Assekouri, Wafaa Elhatimi, El Mostafa Moujahid, Elmouloudi Sabbar

This work reports a study on the polymerization of vinylbenzenesulfonate anion (VBS) previously intercalated in the two-dimensional gallery of CoAl layered double hydroxide (CoAl-LDH). The in-situ polymerization was monitored through a combination of chemical characterization and an investigation of electric and dielectric properties. X-ray diffraction (XRD) results pointed to the successful insertion of VBS molecules in the interlayer space. Fourier transform infrared spectroscopy (FTIR) confirmed the formation of CoAl-PVBS nanocomposite by the polymerization of the intercalated monomers with the appearance of all the expected bands. Thermogravimetric analysis (TGA) showed an enhancement in thermal stability following the polymerization process. Additionally, it was found that the electrical modeling was initially established using an equivalent electrical circuit consisting of three blocks. After polymerization treatment, the sample modeling exhibited one bloc circuit which is related to an increase in the total resistance. Moreover, the in-situ polymerization is accompanied by significant decrease in σ_ac (from 10⁻⁷ to 10⁻¹¹ S.m⁻¹) and dielectric constant. As a result, dependency of dielectric constant on frequency attenuates and tanδ is lowered to below 0.070 (1 kHz). The as-prepared nanocomposite possess ultralow tanδ and suppressed dielectric loss over the frequency range of measure, making them promising for energy storage application.

本文报道了嵌套在双层氢氧化物（CoAl- ldh）二维通道中的乙烯基苯硫酸盐阴离子（VBS）的聚合反应。通过化学表征和电学和介电性能的研究来监测原位聚合。x射线衍射（XRD）结果表明VBS分子在层间空间成功插入。傅里叶变换红外光谱（FTIR）证实了由插层单体聚合形成的煤- pvbs纳米复合材料具有所有预期的谱带。热重分析（TGA）表明聚合过程后热稳定性增强。此外，发现电气建模最初是使用由三个模块组成的等效电路建立的。聚合处理后，样品模型呈现出一组电路，这与总电阻的增加有关。此外，原位聚合还伴随着σac（从10−7减小到10−11 S.m−1）和介电常数的显著降低。因此，介电常数对频率的依赖性减弱，tanδ降至0.070（1 kHz）以下。所制备的纳米复合材料在测量频率范围内具有超低的tanδ和抑制的介电损耗，使其具有储能应用前景。

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引用次数: 0

Symmetry breaking induced by indirect charge transfer governs photophysics of TIPS-pentacene 间接电荷转移引起的对称破缺支配着tips -五苯的光物理

IF 4.6 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Synthetic Metals

Pub Date : 2026-01-10 DOI: 10.1016/j.synthmet.2026.118078

Jieun Lee , Jaewook Kim , Juno Kim , Woojae Kim

Understanding how molecular structure and the surrounding environment shape the electronic states of organic chromophores is crucial for controlling their photophysical responses. In this study, we examine the solvent-polarity-dependent excited-state behavior of TIPS-pentacene (TIPS-Pc), a formally centrosymmetric acene derivative widely employed in organic optoelectronics. Although the absorption spectra of TIPS-Pc show little dependence on solvent polarity, the emission spectra exhibit clear positive solvatochromism, broadened line shapes, and changes in vibronic intensity ratios, indicating subtle yet distinct modifications in the nature of the S₁ state. To account for these effects, we invoke the concept of symmetry breaking, typically associated with quadrupolar donor-acceptor-donor systems, and apply it to TIPS-Pc. Femtosecond transient absorption measurements reveal that in apolar solvents, the excited-state absorption in the near-infrared region is dominated by the Laporte-allowed S₁ → S₂ transition. In polar solvents, however, solvent-induced fluctuations perturb the molecular centrosymmetry, enabling both the S₁ → S₂ and the otherwise Laporte-forbidden S₁ → S₃ transitions. Quantum-chemical analysis indicates that although the TIPS substituents do not directly contribute to the π–π* excitation, the experimental results apparently suggest that their inductive effects indirectly enhance charge-transfer character and could promote exciton desymmetrization.

了解分子结构和周围环境如何塑造有机发色团的电子状态对于控制其光物理响应至关重要。在这项研究中，我们研究了广泛应用于有机光电子学的一种形式中心对称的苯乙烯衍生物TIPS-pentacene （TIPS-Pc）的溶剂极性依赖的激化态行为。尽管TIPS-Pc的吸收光谱对溶剂极性的依赖性很小，但发射光谱表现出明显的正溶剂变色、线形变宽以及振动强度比的变化，表明S1态的性质发生了微妙而明显的改变。为了解释这些影响，我们引用了对称破缺的概念，通常与四极性供体-受体-供体系统相关，并将其应用于TIPS-Pc。飞秒瞬态吸收测量表明，在极性溶剂中，近红外区的激发态吸收主要由拉波特允许的S1→S2跃迁主导。然而，在极性溶剂中，溶剂诱导的波动扰乱了分子的中心对称性，使S1→S2和拉波特禁止的S1→S3转变成为可能。量子化学分析表明，虽然TIPS取代基不直接参与π -π *激发，但实验结果明显表明，它们的诱导效应间接增强了电荷转移特性，促进了激子的非对称化。

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引用次数: 0

Functionalized imidazole chromophores containing triphenylamine and acridine units for solution-processed deep-blue OLEDs 含三苯胺和吖啶基团的功能化咪唑发色团溶液处理的深蓝色oled

IF 4.6 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Synthetic Metals

Pub Date : 2026-01-07 DOI: 10.1016/j.synthmet.2026.118076

Qingyuan Tian , Shuomei Zhang , Di Zhang , Yuling Zhao , Wenming Su , Tianzhi Yu

Two Y-shaped imidazole-derived chromophores, DMAC-π-IM-(π-TPA)₂ and DPAC-π-IM-(π-TPA)_2, with imidazole unit as the acceptor and two triphenylamine (TPA) moieties attached at C4 and C5 positions of imidazole ring and one 9,9-dimethylacridine (DMAC) or 9,9-diphenylacridine (DPAC) moiety attached at C2 position of imidazole ring, were designed and synthesized for solution-processed blue OLEDs. Both of the compounds displayed deep-blue emission in toluene solution with photoluminescent quantum yield (PLQY) of 63.26 % for DMAC-π-IM-(π-TPA)₂ and 65.61 % for DPAC-π-IM-(π-TPA)₂, while they exhibited green emission in thin films with PLQY of 30.33 % and 24.48 %, and the compounds showed excellent thermal stability with the decomposition temperatures of 457 °C and 491 °C, respectively. In the absence of the hole-transporting layer, the solution-processed doped devices using the blend of 1,3-di(9H-carbazol-9-yl)benzene (mCP) with the Y-shaped imidazole-derived chromophores as emitting layers emitted deep-blue emission a maximum luminance (L_max) of 1206 cd/m² and a maximum external quantum efficiency (EQE_max) of 2.40 % for DMAC-π-IM-(π-TPA)₂ and a L_max of 944 cd/m² and a EQE_max of 3.60 % for DPAC-π-IM-(π-TPA)₂, respectively, suggesting that these compounds have a great potential as the organic emitters for deep-blue OLEDs.

设计合成了以咪唑为受体，在咪唑环的C4和C5位置连接两个三苯胺（TPA）基团，在咪唑环的C2位置连接一个9,9-二甲基吖啶（DMAC）或9,9-二苯吖啶（DPAC）基团的两个y形咪唑衍生的发色团DMAC-π- im -(π-TPA)2和DPAC-π- im -(π-TPA)2。两种化合物在甲苯溶液中均表现出深蓝色发光，DMAC-π- im -(π-TPA)2的光致发光量子产率为63.26 %,DPAC-π- im -(π-TPA)2的光致发光量子产率为65.61 %，而在薄膜中表现出绿色发光，PLQY分别为30.33 %和24.48 %，两种化合物均表现出优异的热稳定性，分解温度分别为457℃和491℃。在没有空穴传输层的情况下，以1,3-二（9h -卡布唑-9-基）苯（mCP）和y形咪唑衍生发色团为发射层的溶液处理掺杂器件发射出深蓝，DMAC-π- im -(π-TPA)2的最大亮度（Lmax）为1206 cd/m2，最大外量子效率（EQEmax）为2.40 %,DPAC-π- im -(π-TPA)2的Lmax为944 cd/m2， EQEmax为3.60 %。这表明这些化合物有很大的潜力作为深蓝色有机发光二极管的有机发射体。

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引用次数: 0

Origin and suppression of low-bias efficiency loss in OLEDs with a polar electron transport layer 具有极性电子传输层的有机发光二极管低偏置效率损失的来源和抑制

IF 4.6 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Synthetic Metals

Pub Date : 2026-01-07 DOI: 10.1016/j.synthmet.2026.118077

Zhaoyue Lü , Wei Jiang , Sinuo Xu , Junling Wang , Jing Xiao

Organic light-emitting diodes (OLEDs) often experience efficiency loss near the turn-on voltage, an issue that has received limited attention yet is critically associated with interfacial charge accumulation. Herein, leveraging an ultrathin Ir(piq)₂(acac) spectral probe to study the voltage-dependent recombination zone (RZ) evolution in Ir(ppy)₃-based OLEDs with a BCP electron transport layer (ETL), we elucidate the critical role of interfacial charge accumulation in inducing low-bias efficiency loss. Experimental results show the RZ is initially confined near the emissive layer (EML)/ETL interface at low bias and gradually shifts toward the EML center with increasing voltage. Low-bias efficiency loss is attributed to exciton-polaron quenching caused by interfacial charge accumulation, which primarily stems from spontaneous orientation polarization (SOP) in the BCP polar layer, a phenomenon confirmed by transient electroluminescence measurements. We further modulate BCP SOP by varying substrate temperature (T_sub) during deposition: higher T_sub suppresses SOP, reduces interfacial charge accumulation, mitigates exciton-polaron quenching, and shifts the RZ toward the EML center, thereby improving device efficiency. However, excessive T_sub (e.g., 85 °C) induces non-emissive species in underlying functional layers, ultimately reducing efficiency. For BCP deposition, the T_sub exhibits an optimal range of 65–80 °C. These findings not only deepen the understanding of efficiency loss mechanism in OLEDs but also provide a practical strategy for performance optimization by modulating molecular stacking via T_sub.

有机发光二极管（oled）在导通电压附近经常出现效率损失，这一问题受到的关注有限，但与界面电荷积累密切相关。本文利用超薄Ir(piq)2（acac）光谱探针研究了具有BCP电子传输层（ETL）的Ir(ppy)3基oled中电压依赖的复合区（RZ）演化，阐明了界面电荷积累在诱导低偏置效率损失中的关键作用。实验结果表明，在低偏压下，RZ最初被限制在EML /ETL界面附近，随着电压的升高，RZ逐渐向EML中心偏移。低偏置效率损失归因于界面电荷积累引起的激子-极化子猝灭，这主要源于BCP极层中的自发取向极化（SOP），这一现象被瞬态电致发光测量证实。我们进一步通过改变沉积过程中的衬底温度（Tsub）来调节BCP SOP：较高的Tsub抑制SOP，减少界面电荷积累，减轻激子-极化子猝灭，并将RZ向EML中心移动，从而提高器件效率。然而，过高的Tsub（例如85°C）会在底层功能层中诱导非发射物质，最终降低效率。对于BCP沉积，Tsub的最佳温度范围为65-80°C。这些发现不仅加深了对oled效率损失机制的理解，而且为通过Tsub调节分子堆叠来优化性能提供了实用的策略。

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引用次数: 0

3D printing of PEDOT:PSS microstructures: Capacitance scaling and mechanical flexibility for microelectronic devices PEDOT的3D打印：PSS微结构：微电子器件的电容缩放和机械灵活性

IF 4.6 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Synthetic Metals

Pub Date : 2026-01-06 DOI: 10.1016/j.synthmet.2026.118075

Myung-Nam Jeong , Hyeon-Seok Seo , Jaewon Choi , Jae-Hoon Kim , Seong-Jae Eom , Ki Hoon Sung , Jong-Sik Moon , Vanna Chrismas Silalahi , Jong-Min Lee

The precise fabrication of three-dimensional (3D) conductive polymer microarchitectures is critical for advancing flexible electronics and micro-sensing technologies. Here, we report a meniscus-guided 3D printing approach for the direct writing of high-aspect-ratio poly(3,4-ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS) microstructures. By leveraging controlled meniscus stretching and solvent evaporation, we fabricated free-standing micropillar arrays with aspect ratios exceeding 20:1. Systematic optimization of ink rheology and pulling speed enabled precise dimensional control, yielding uniform diameters down to a few micrometers. The printed microstructures exhibited remarkable electro-structural stability, showing negligible resistance change after 1000 bending cycles at 10 % strain. Functionally, these arrays demonstrated highly sensitive picofarad (pF)-scale capacitance variations dependent on electrode separation, confirming the preservation of PEDOT:PSS conductivity and their suitability for ultra-sensitive capacitive microsensors. Successful integration onto flexible conductive paper substrates underscores the versatility of this technique. This meniscus-guided strategy provides a scalable pathway for fabricating robust, 3D conductive polymer architectures for next-generation high-density electronics, microsensors, and wearable devices.

三维（3D）导电聚合物微结构的精确制造对于推进柔性电子和微传感技术至关重要。在这里，我们报告了一种半月板引导的3D打印方法，用于直接书写高纵横比聚（3,4-乙烯二氧噻吩）：聚苯乙烯磺酸盐（PEDOT:PSS）微结构。通过控制半月板拉伸和溶剂蒸发，我们制造了纵横比超过20:1的独立式微柱阵列。油墨流变性和拉出速度的系统优化实现了精确的尺寸控制，使直径均匀到几微米。打印的微结构表现出显著的电结构稳定性，在10 %应变下弯曲1000次后电阻变化可以忽略不计。在功能上，这些阵列显示出依赖于电极分离的高度敏感的皮法拉（pF）尺度电容变化，证实了PEDOT:PSS电导率的保存及其对超灵敏电容微传感器的适用性。在柔性导电纸基板上的成功集成强调了该技术的多功能性。这种半月板导向策略为下一代高密度电子产品、微传感器和可穿戴设备制造坚固的3D导电聚合物结构提供了可扩展的途径。

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引用次数: 0

Electrochemically tailored polythiophene–fullerene heterostructures integrated with binary-cation modulated quasi-solid-state ionic gel electrolytes for enhanced interfacial kinetics in dye-sensitized solar cells 电化学定制的多噻吩-富勒烯异质结构与二元阳离子调制准固态离子凝胶电解质集成，用于增强染料敏化太阳能电池的界面动力学

IF 4.6 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Synthetic Metals

Pub Date : 2026-01-05 DOI: 10.1016/j.synthmet.2026.118074

Muhammad Hamza Rasheed , Yasir Qayyum Gill , Muhammad Farooq , Muhammad Younas , Umer Mehmood

Interfacial recombination and limited ionic mobility remain major bottlenecks in advancing dye-sensitized solar cell (DSSC) performance. In this work, we develop a dual-material strategy that simultaneously enhances electronic and ionic transport by integrating a microwave-synthesized polythiophene–fullerene (PTh–C₆₀) nanocomposite counter electrode with a binary-cation ionic liquid polymer gel electrolyte (ILPGE). The optimized PTh–C₆₀ electrode exhibits a markedly improved electrical conductivity of 83.15 S cm⁻¹ , as confirmed by four-point probe analysis, supported by structural and morphological evidence from XRD and SEM. The ILPGE, formulated using LiI and TPAI within a polyacrylonitrile matrix and supplemented with an imidazolium-based ionic liquid, demonstrates a maximum ionic conductivity of 2.02 × 10⁻² mS cm⁻¹ and stable, reversible redox behavior over a wide electrochemical window (–1.5 V to +1.5 V). Molecular dynamics simulations reveal significantly enhanced ion diffusion in the dual-cation gel, while DFT calculations confirm favorable PTh–C₆₀ interaction energies that support efficient electrocatalytic interfaces. When integrated into a quasi-solid-state DSSC, the optimized materials deliver a power conversion efficiency of 7.87 %, surpassing the standard Pt-based device (7.45 %). Notably, the quasi-solid-state cell exhibits excellent long-term durability, retaining its performance beyond 25 days, whereas the standard device undergoes rapid degradation. This combined materials design offers a scalable and stable pathway for improving charge transport, interfacial kinetics, and operational lifetime in next-generation quasi-solid-state DSSCs.

界面复合和有限的离子迁移率仍然是提高染料敏化太阳能电池性能的主要瓶颈。在这项工作中，我们开发了一种双材料策略，通过将微波合成的聚噻吩-富勒烯（PTh-C₆₀）纳米复合对电极与二元阳离子离子液体聚合物凝胶电解质（ILPGE）集成在一起，同时增强了电子和离子传输。优化后的PTh-C₆₀电极的电导率为83.15 S cm（⁻¹ ），四点探针分析证实了这一点，XRD和SEM的结构和形态证据也证实了这一点。ILPGE是用LiI和TPAI在聚丙烯腈基质中配制的，并以咪唑基离子液体为补充物，其最大离子电导率为2.02 × 10⁻²mS cm⁻¹ ，在宽电化学窗口（-1.5 V至+1.5 V）内具有稳定、可逆的氧化还原行为。分子动力学模拟显示双阳离子凝胶中的离子扩散显著增强，而DFT计算证实有利的PTh-C₆₀相互作用能支持有效的电催化界面。当集成到准固态DSSC中时，优化的材料提供7.87 %的功率转换效率，超过了标准的基于pt的器件（7.45 %）。值得注意的是，准固态电池表现出优异的长期耐久性，其性能保持在25天以上，而标准器件则会迅速退化。这种组合材料的设计为改善下一代准固态DSSCs的电荷传输、界面动力学和使用寿命提供了一种可扩展和稳定的途径。

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引用次数: 0

Fabrication of solution-processed organic field-effect transistor by structural engineering of naphtho[1,2-b:5,6-b’]dithiophene derivatives 萘[1,2-b:5,6-b ']二噻吩衍生物的结构工程制备溶液加工有机场效应晶体管

IF 4.6 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Synthetic Metals

Pub Date : 2026-01-02 DOI: 10.1016/j.synthmet.2026.118073

Yerack Choi , Hyeonju Jang , Sejoong Kim , Choongik Kim , SungYong Seo

In this study, three novel organic semiconductors based on naphthodithiophene (NDT) derivatives were synthesized to investigate the influence of side-chain structure and phase transition on their material properties and electronic performance. The synthesized compounds are 2-octyl-7-(thiophen-2-yl)naphtho[1,2-b:5,6-b′]dithiophene (compound 1), 2-octyl-7-(5-octylthiophen-2-yl)naphtho[1,2-b:5,6-b′]dithiophene (compound 2), and 2-(5-(octan-3-yl)thiophen-2-yl)-7-octylnaphtho[1,2-b:5,6-b′]dithiophene (compound 3). To understand the effect of the different side chains, the optical, electrochemical, and thermal properties of the compounds were characterized, and their thin-film morphologies and phase transition behavior were analyzed. Solution-processed organic field-effect transistors (OFETs) were then fabricated using these materials as the active channel layer to evaluate the semiconducting performance. Among the three compounds, compound 1, which possesses the simplest side-chain structure, exhibited the highest carrier mobility of 0.024 cm²/(V·s). This result emphasizes the importance of side-chain engineering in molecular design, as the bulkier side chains on compounds 2 and 3 led to inferior semiconducting performance, likely due to increased steric hindrance that disrupts effective intermolecular packing.

本研究合成了三种新型的基于萘二噻吩（NDT）衍生物的有机半导体，研究了侧链结构和相变对其材料性能和电子性能的影响。合成的化合物为2-辛基-7-（噻吩-2-基）萘[1,2-b:5,6-b ']二噻吩（化合物1）、2-辛基-7-（5-辛基噻吩-2-基）萘[1,2-b:5,6-b ']二噻吩（化合物2）和2-(5-（辛烷-3-基）噻吩-2- 7-辛基噻吩[1,2-b:5,6-b ']二噻吩（化合物3）。为了了解不同侧链的影响，表征了化合物的光学、电化学和热性能，并分析了它们的薄膜形态和相变行为。然后用这些材料作为有源沟道层制备溶液处理的有机场效应晶体管（ofet），以评估其半导体性能。其中，侧链结构最简单的化合物1的载流子迁移率最高，为0.024 cm2/（V·s）。这一结果强调了侧链工程在分子设计中的重要性，因为化合物2和3上体积较大的侧链导致半导体性能较差，可能是由于空间位阻增加，破坏了有效的分子间包装。

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引用次数: 0

EMI shielding and joule heating properties of Cu/Ni metallized knitted fabrics 铜/镍金属化针织物的电磁干扰屏蔽及焦耳加热性能

IF 4.6 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Synthetic Metals

Pub Date : 2025-12-30 DOI: 10.1016/j.synthmet.2025.118072

Shachi Yadav, Kuldip Singh, Vijay Baheti

In this study, the electroless plating method was optimized for three process parameters i.e., CuSO₄ concentration, NiSO₄ concentration, and pH using an L9 orthogonal array Taguchi design for developing long lasting metallized fabrics. Further, few sample prototypes of metallized fabrics were developed at optimum electroless plating conditions with varying plating time. The morphological characterizations such as SEM, EDS, and XRD analysis of metallized fabrics depicted successful deposition of Cu/Ni particles. The electroless plating process was found to increase the fabric areal density, thickness and stiffness, while slightly reducing air permeability with a marginal increase in thermal and water vapour transmission. The electrical conductivity of the fabric was found stable at higher stretch levels, indicating its robust conductive performance. The metallized fabric showed an EMI shielding effectiveness of ∼26 dB across both lower and higher frequency ranges, alongside efficient joule heating, reaching ∼250 °C within 180 s at 10 V. These results demonstrated the potential of metallized fabrics as breathable, stretchable materials for advanced applications in EMI shielding and electrothermal devices.

本研究采用L9正交设计，对硫酸铜浓度、硫酸钾浓度和pH 3个工艺参数进行优化，以制备长效金属化织物。此外，在不同电镀时间的最佳化学镀条件下，很少有金属化织物的样品原型。金属化织物的SEM、EDS和XRD等形貌表征表明，Cu/Ni颗粒成功沉积。发现化学镀工艺增加了织物的面密度、厚度和刚度，同时略微降低了透气性，但热和水蒸气的透射率略有增加。织物的导电性在较高的拉伸水平下保持稳定，表明其导电性能良好。金属化织物在低频率和高频率范围内的电磁干扰屏蔽效率为~ 26 dB，伴随着有效的焦耳加热，在180 s内达到~ 250°C，电压为10 V。这些结果证明了金属化织物作为一种透气、可拉伸的材料在电磁干扰屏蔽和电热器件中的先进应用的潜力。

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引用次数: 0