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Thiophene appended schiff base probe for selective ‘turn-on’ response for copper (ii) ion and their applications in live cell imaging Thiophene appended schiff base probe for selective ‘turn-on’ response for copper (ii) ion and their applications in live cell imaging 用于铜(ii)离子选择性 "开启 "响应的噻吩添加的雪夫碱探针及其在活细胞成像中的应用 用于铜(ii)离子选择性 "开启 "响应的噻吩添加的雪夫碱探针及其在活细胞成像中的应用
IF 4 3区 材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-09-13 DOI: 10.1016/j.synthmet.2024.117752
Preethi Dhanapal, Manju S.L.

In this research, we have synthesized a thiophene Schiff base from 5-phenyl thiophene-2-carboxaldehyde and 2-thiophene carboxylic acid hydrazide and characterized by using FT-IR NMR, HRMS and SC-XRD analysis techniques. The probe exhibited a selective turn-on fluorescence response for Cu2+ over 20 other common metal ions in a CH3CN (9:1, v/v) solution. The Job’s plot represents a 1:1 binding complexation mode and further DFT study was carried out to aid in understanding the geometric structure and interaction of the ligand and Cu2+. The detection limit (LOD) and limit of quantification (LOQ) were found to be 20 nM and 69 nM respectively. Furthermore, the probe’s sensing ability was tested in HeLa cells and their fluorescence imaging also supported the effective turn-on response towards Cu2+ ion.

在这项研究中,我们用 5-苯基噻吩-2-甲醛和 2-噻吩羧酸酰肼合成了一种噻吩希夫碱,并利用傅立叶变换红外核磁共振、高光谱质谱和 SC-XRD 分析技术对其进行了表征。在 CH3CN(9:1,v/v)溶液中,该探针对 Cu2+ 和其他 20 种常见金属离子具有选择性开启荧光响应。约伯图显示了 1:1 的结合络合模式,进一步的 DFT 研究有助于了解配体和 Cu2+ 的几何结构和相互作用。检测限(LOD)和定量限(LOQ)分别为 20 nM 和 69 nM。此外,还在 HeLa 细胞中测试了该探针的传感能力,其荧光成像也证实了该探针对 Cu2+ 离子的有效开启反应。
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引用次数: 0
Influence of nitrogen exchange in the core-shell structure of naphthalenediimide molecules on the advancement of quantum electronic properties 萘二亚胺分子核壳结构中的氮交换对量子电子特性进步的影响
IF 4 3区 材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-09-12 DOI: 10.1016/j.synthmet.2024.117748
Hamid Hadi , Ahmed Mahmoud Ahmed Mahmoud , Imen Cherif , Reza Safari , Bouzid Gassoumi , Balkis Abdelaziz , A Aathif Basha , Predhanekar Mohamed Imran , Muhammad Usman Khan , Hasan Zandi , Mounira Mahdouani , Sahbi Ayachi , Rafik Ben Chaabane , Mahmoud M. Hessien

This study explores how nitrogen substitution and gold electrodes collectively influence the electronic characteristics of naphthalenediimide (NDI) molecules (M = 1, 2, and 3) through theoretical analysis. Utilizing ELF, LOL, QTAIM, and NCI analyses, we reveal significant alterations in NDI's electronic structure and interactions upon bonding with gold electrodes (Au-M-Au). Both ELF and LOL analyses demonstrate increased electron localization and delocalization on the NDI surface due to gold electrodes, with a stronger effect on nitrogen-doped molecules (M = 2, 3). QTAIM analysis confirms favorable non-covalent interactions, including evident hydrogen bonding, between NDI molecules and gold electrodes, notably intensified in doped molecules, especially the Au…O interaction. NCI analysis provides insight into the diverse interactions within the molecular system. Overall, this research highlights the crucial role of gold electrodes and nitrogen substitution in fine-tuning NDI molecules' electronic properties. The observed modulation of electron behavior and formation of beneficial interactions with gold electrodes hint at promising applications for doped NDI-gold systems requiring efficient charge transport mechanisms.

本研究通过理论分析,探讨氮取代和金电极如何共同影响萘二亚胺(NDI)分子(M = 1、2 和 3)的电子特性。利用 ELF、LOL、QTAIM 和 NCI 分析,我们揭示了 NDI 与金电极(Au-M-Au)结合后电子结构和相互作用的显著变化。ELF 和 LOL 分析表明,金电极增加了 NDI 表面的电子定位和脱定位,对掺氮分子(M = 2、3)的影响更大。QTAIM 分析证实了 NDI 分子与金电极之间有利的非共价相互作用,包括明显的氢键作用,掺杂分子的这种作用明显增强,尤其是 Au...O 相互作用。通过 NCI 分析,可以深入了解分子体系内的各种相互作用。总之,这项研究强调了金电极和氮取代在微调 NDI 分子电子特性方面的关键作用。观察到的电子行为调制以及与金电极形成的有益相互作用,为需要高效电荷传输机制的掺杂 NDI 金系统带来了广阔的应用前景。
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引用次数: 0
Enhancing device characteristics of InP quantum dot LED through structural modification with polyethylene glycol blend 通过聚乙二醇混合物的结构改性提高 InP 量子点 LED 的器件特性
IF 4 3区 材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-09-12 DOI: 10.1016/j.synthmet.2024.117747
Jaeseung Kim , Ji Ho Roh , Thi Na Le , Min Woo Hyeon , Bong Hoon Cha , Min Chul Suh , Hyunjung Kim

This study explored the integration of polyethylene glycol (PEG) into InP-based quantum dot (QD) light-emitting diodes (LEDs). By 5 wt% of PEG 400 blended into the QD emission layer (EML), we achieved an enhancement in both current efficiency (100 %) and external quantum efficiency (91 %). X-ray reflectivity revealed significant morphological changes in the QD EML upon PEG incorporation, primarily manifesting as increased thickness in the dense surface region without affecting the total thickness. This adjustment influenced electron density distribution, impacting hole and electron flow. Overall, the addition of PEG not only improved the electrical properties of QD LEDs but also reshaped the internal morphology of the QD EML. Notably, the efficiency improvements observed rival those achieved by integrating traditional hole transport materials into QD EMLs.

本研究探讨了将聚乙二醇(PEG)整合到基于 InP 的量子点(QD)发光二极管(LED)中的问题。通过在 QD 发射层 (EML) 中掺入 5 wt% 的 PEG 400,我们提高了电流效率(100%)和外部量子效率(91%)。X 射线反射率显示,掺入 PEG 后,QD EML 的形态发生了显著变化,主要表现为致密表面区域的厚度增加,但不影响总厚度。这种调整影响了电子密度分布,对空穴和电子流产生了影响。总之,添加 PEG 不仅改善了 QD LED 的电学特性,还重塑了 QD EML 的内部形态。值得注意的是,所观察到的效率提高与将传统空穴传输材料集成到 QD EML 中实现的效率提高不相上下。
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引用次数: 0
AC-driven QLED based on far-field effect of Au NPs 基于金氧化物远场效应的交流驱动 QLED
IF 4 3区 材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-09-11 DOI: 10.1016/j.synthmet.2024.117749
Yanyue Yao, Zebang Zhao, Xiaojie Gong, Dandan Song, Bo Qiao, Zheng Xu, Suling Zhao

As the pixel size continues to shrink, conventional display devices are unable to satisfy the increasing demand. Therefore, a novel light-emitting device has garnered significant attention. This device emitted light under an alternating current (AC) electric field and blocked the injection of external carriers by using the insulating layer. However, at the same time, this approach leads to a reduction in brightness. In this paper, we have realized the performance enhancement of AC-driven QLEDs by incorporating Au NPs of different sizes in PEDOT:PSS. Our investigation reveals that Au NPs of greater size exhibit a notable enhancement of the brightness, rising from 5512 cd/m2 to 7234 cd/m2, representing a substantial increase of approximately 31.2 %. It demonstrates the great potential of the "far-field" effect in AC-driven QLEDs.

随着像素尺寸的不断缩小,传统的显示设备已无法满足日益增长的需求。因此,一种新型发光器件备受关注。这种器件在交流(AC)电场下发光,并利用绝缘层阻止外部载流子的注入。但同时,这种方法也导致亮度降低。在本文中,我们在 PEDOT:PSS 中加入了不同尺寸的金氧化物,从而实现了交流驱动 QLED 的性能提升。我们的研究发现,尺寸越大的金氮化物亮度越高,从 5512 cd/m2 上升到 7234 cd/m2,大幅提高了约 31.2%。这证明了 "远场 "效应在交流驱动 QLED 中的巨大潜力。
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引用次数: 0
Thieno[3,2-b]thiophene flanked para-azaquinodimethane π-extended aromatic-quinoidal polymers 噻吩并[3,2-b]噻吩侧面对位氮杂喹啉二甲烷π-扩展芳香醌聚合物
IF 4 3区 材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-09-10 DOI: 10.1016/j.synthmet.2024.117751
Bharath Dyaga , Witold Waliszewski , Zhitian Ling , Sasikumar Mayarambakam , Olivier Boyron , Wojciech Pisula , Bruno Schmaltz

A series of thieno[3,2-b]thiophene (TT) flanked para-azaquinodimethane (p-AQM) based quinoidal conjugated polymers PAQM2TT-T, PAQM2TT-BT and PAQM3TT were designed in a strategy to extend the aromatic-quinoidal π-system. The three polymers were synthesized by Stille polycondensation, and their opto-electronic properties and device performance in field-effect transistors have been explored. From absorption spectroscopy, the polymers show low bandgaps (1.54–1.57 eV) and high HOMO energy levels. They exhibit typical p-type behavior according to the results of the characterization of the field-effect transistors with average charge carrier mobilities of 0.08 cm2 V−1 s−1 for PAQM2TT-T, 0.12 cm2 V−1 s−1 for PAQM2TT-BT and 0.05 cm2 V−1 s−1 for PAM3TT. This report presents an alternative π-extended quinoidal-donor strategy to control the molecular design and properties of new p-AQM-based conjugated polymers.

为了扩展芳香-醌π系统,我们设计了一系列噻吩并[3,2-b]噻吩(TT)侧对位氮杂喹啉二甲烷(p-AQM)基醌类共轭聚合物 PAQM2TT-T、PAQM2TT-BT 和 PAQM3TT。通过 Stille 缩聚法合成了这三种聚合物,并对它们在场效应晶体管中的光电特性和器件性能进行了研究。从吸收光谱来看,这些聚合物显示出低带隙(1.54-1.57 eV)和高 HOMO 能级。根据场效应晶体管的表征结果,它们表现出典型的 p 型行为,PAQM2TT-T 的平均电荷载流子迁移率为 0.08 cm2 V-1 s-1,PAQM2TT-BT 为 0.12 cm2 V-1 s-1,PAM3TT 为 0.05 cm2 V-1 s-1。本报告介绍了一种替代性的 π 扩展醌-载体策略,用于控制基于 p-AQM 的新型共轭聚合物的分子设计和特性。
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引用次数: 0
Preparation and infrared shielding of polyaniline@MWCNTs flexible electrochromic device based on cotton fabric 基于棉织物的聚苯胺@MWCNTs 柔性电致变色装置的制备与红外屏蔽
IF 4 3区 材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-09-07 DOI: 10.1016/j.synthmet.2024.117744
Mengjie Li, Wei Jiang, Yun Lin, Changhui Li, Xue Liu, Qiongzhen Liu, Wenwen Wang, Liyan Yang, Yuedan Wang, Dong Wang

Electrochromic fabric was formed by interfacial polymerization of polyaniline (PANI) and multi-walled carbon nanotubes (MWCNTs) on the surface of cotton cloth. The morphology and properties of the composite films were controlled by changing the content of multi-walled carbon nanotubes. The electrochromic properties of the fabric and its application in the field of near-infrared thermal shielding were studied. It is found that the electrochromic fabrics with MWCNTs have better electrochemical and color-changing properties. Electrochromic fabrics achieve color changes from light yellow to yellow-green to dark green in the voltage range of −1.0–1.2 V, and maintain a fast color switching time (2.15 s for coloring, 1.89 s for bleaching) after 600 cycles. The reflection contrast (ΔR) at 500 nm is 23.01 %. Moreover, the electrochromic devices are assembled with fabrics. The device has obvious discoloration and good bending stability. In addition, the thermal shielding is realized by using their reflection characteristics in the visual-near-infrared region. The results show that the electrochromic device has a low surface temperature at different environmental condition, and the thermal reduction from the original state to the bleached state is up to 3.8 ° C, indicating the potential application of the device in thermal regulation.

通过聚苯胺(PANI)和多壁碳纳米管(MWCNTs)在棉布表面的界面聚合形成了电致变色织物。通过改变多壁碳纳米管的含量来控制复合薄膜的形态和性能。研究了织物的电致变色特性及其在近红外热屏蔽领域的应用。研究发现,含有多壁碳纳米管的电致变色织物具有更好的电化学性能和变色性能。电致变色织物在 -1.0-1.2 V 的电压范围内实现了从浅黄色到黄绿色再到深绿色的颜色变化,并且在 600 次循环后仍能保持快速的颜色切换时间(着色 2.15 s,漂白 1.89 s)。在 500 纳米波长处的反射对比度(ΔR)为 23.01%。此外,电致变色装置与织物组装在一起。该装置具有明显的褪色和良好的弯曲稳定性。此外,还利用其在可视-近红外区域的反射特性实现了热屏蔽。研究结果表明,电致变色装置在不同环境条件下的表面温度较低,从原始状态到漂白状态的热降幅可达 3.8 °C,这表明该装置在热调节方面具有潜在的应用价值。
{"title":"Preparation and infrared shielding of polyaniline@MWCNTs flexible electrochromic device based on cotton fabric","authors":"Mengjie Li,&nbsp;Wei Jiang,&nbsp;Yun Lin,&nbsp;Changhui Li,&nbsp;Xue Liu,&nbsp;Qiongzhen Liu,&nbsp;Wenwen Wang,&nbsp;Liyan Yang,&nbsp;Yuedan Wang,&nbsp;Dong Wang","doi":"10.1016/j.synthmet.2024.117744","DOIUrl":"10.1016/j.synthmet.2024.117744","url":null,"abstract":"<div><p>Electrochromic fabric was formed by interfacial polymerization of polyaniline (PANI) and multi-walled carbon nanotubes (MWCNTs) on the surface of cotton cloth. The morphology and properties of the composite films were controlled by changing the content of multi-walled carbon nanotubes. The electrochromic properties of the fabric and its application in the field of near-infrared thermal shielding were studied. It is found that the electrochromic fabrics with MWCNTs have better electrochemical and color-changing properties. Electrochromic fabrics achieve color changes from light yellow to yellow-green to dark green in the voltage range of −1.0–1.2 V, and maintain a fast color switching time (2.15 s for coloring, 1.89 s for bleaching) after 600 cycles. The reflection contrast (ΔR) at 500 nm is 23.01 %. Moreover, the electrochromic devices are assembled with fabrics. The device has obvious discoloration and good bending stability. In addition, the thermal shielding is realized by using their reflection characteristics in the visual-near-infrared region. The results show that the electrochromic device has a low surface temperature at different environmental condition, and the thermal reduction from the original state to the bleached state is up to 3.8 ° C, indicating the potential application of the device in thermal regulation.</p></div>","PeriodicalId":22245,"journal":{"name":"Synthetic Metals","volume":"309 ","pages":"Article 117744"},"PeriodicalIF":4.0,"publicationDate":"2024-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142164137","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}
引用次数: 0
Oxidative calcination of brewery bagasse and in-situ preparation of activated carbon-PEDOT composite for hybrid supercapacitor application 氧化煅烧啤酒渣和原位制备用于混合超级电容器的活性炭-PEDOT 复合材料
IF 4 3区 材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-09-06 DOI: 10.1016/j.synthmet.2024.117735
S.E. Kayode , C.E. Sánchez-Rodríguez , R. López-Sandoval , F.J. González

In this study, we prepared an electrode material from biowaste residue for hybrid supercapacitor application. Bagasse from brewery residue was treated by oxidative calcination at 300 °C. The carbonized material was impregnated using different concentrations of potassium hydroxide (KOH), followed by thermal annealing at 850 °C to obtain activated carbon (AC). The AC obtained was used to prepare a composite with poly(3,4-ethylenedioxythiophene) (PEDOT) via in-situ polymerization process using iron (III) tosylate as oxidizing agent. Pure activated carbon attained a specific surface area (SSA) of 625 m2 g−1, and specific capacitance of 80.38 F g−1 at 5 mV s−1 while the AC-PEDOT composite presents 201 F g−1 at the same scan rate, given about 250 % improvement to the specific capacitance. Likewise, the AC presented an energy density of 10.88 Wh Kg−1 and a power density of 9411.59 W Kg−1 at 0.5 A g−1 while the AC-PEDOT composite showed energy density of 25.92 Wh Kg−1 and power density of 4836.44 W Kg−1 at 0.5 A g−1. The results confirm the properties of AC as a supercapacitive material and a battery-like behavior for the AC-PEDOT composite, demonstrating potential for hybrid supercapacitors application.

在这项研究中,我们利用生物废渣制备了一种用于混合超级电容器的电极材料。酿酒残渣中的甘蔗渣在 300 °C 下进行氧化煅烧处理。使用不同浓度的氢氧化钾(KOH)对碳化材料进行浸渍,然后在 850 °C 下进行热退火处理,以获得活性炭(AC)。得到的活性炭与聚(3,4-亚乙二氧基噻吩)(PEDOT)通过原位聚合工艺,以对甲苯磺酸铁(III)为氧化剂制备复合材料。纯活性炭的比表面积(SSA)为 625 m2 g-1,在 5 mV s-1 下的比电容为 80.38 F g-1,而 AC-PEDOT 复合材料在相同扫描速率下的比电容为 201 F g-1,比电容提高了约 250%。同样,交流电在 0.5 A g-1 时的能量密度为 10.88 Wh Kg-1,功率密度为 9411.59 W Kg-1,而交流电-PEDOT 复合材料在 0.5 A g-1 时的能量密度为 25.92 Wh Kg-1,功率密度为 4836.44 W Kg-1。这些结果证实了交流电作为超级电容器材料的特性,以及交流电-PEDOT 复合材料类似电池的行为,展示了混合超级电容器的应用潜力。
{"title":"Oxidative calcination of brewery bagasse and in-situ preparation of activated carbon-PEDOT composite for hybrid supercapacitor application","authors":"S.E. Kayode ,&nbsp;C.E. Sánchez-Rodríguez ,&nbsp;R. López-Sandoval ,&nbsp;F.J. González","doi":"10.1016/j.synthmet.2024.117735","DOIUrl":"10.1016/j.synthmet.2024.117735","url":null,"abstract":"<div><p>In this study, we prepared an electrode material from biowaste residue for hybrid supercapacitor application. Bagasse from brewery residue was treated by oxidative calcination at 300 °C. The carbonized material was impregnated using different concentrations of potassium hydroxide (KOH), followed by thermal annealing at 850 °C to obtain activated carbon (AC). The AC obtained was used to prepare a composite with poly(3,4-ethylenedioxythiophene) (PEDOT) via <em>in-situ</em> polymerization process using iron (III) tosylate as oxidizing agent. Pure activated carbon attained a specific surface area (SSA) of 625 m<sup>2</sup> g<sup>−1</sup>, and specific capacitance of 80.38 F g<sup>−1</sup> at 5 mV s<sup>−1</sup> while the AC-PEDOT composite presents 201 F g<sup>−1</sup> at the same scan rate, given about 250 % improvement to the specific capacitance. Likewise, the AC presented an energy density of 10.88 Wh Kg<sup>−1</sup> and a power density of 9411.59 W Kg<sup>−1</sup> at 0.5 A g<sup>−1</sup> while the AC-PEDOT composite showed energy density of 25.92 Wh Kg<sup>−1</sup> and power density of 4836.44 W Kg<sup>−1</sup> at 0.5 A g<sup>−1</sup>. The results confirm the properties of AC as a supercapacitive material and a battery-like behavior for the AC-PEDOT composite, demonstrating potential for hybrid supercapacitors application.</p></div>","PeriodicalId":22245,"journal":{"name":"Synthetic Metals","volume":"309 ","pages":"Article 117735"},"PeriodicalIF":4.0,"publicationDate":"2024-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142230183","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}
引用次数: 0
Efficient electrooxidation of methanol by Co-Pt bimetallic nanoparticles loaded on carbon nanotubes in alkaline environment 碳纳米管上负载的 Co-Pt 双金属纳米粒子在碱性环境中对甲醇的高效电氧化作用
IF 4 3区 材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-09-05 DOI: 10.1016/j.synthmet.2024.117736
Shuiyan Ning, Guiqi Gao, Ruiwen Yan

In this work, composites of Co-Pt nanoparticles/carbon nanotubes (Co-Pt NPs/CNTs) were prepared by loading binary nanoparticles Co-Pt nanoparticles onto carbon nanotubes. These composites were utilized as highly efficient catalysts for the methanol electrocatalytic oxidation reaction (MOR). The morphology of the materials was analyzed using transmission electron microscopy (TEM), Spherical Aberration Corrected Scanning (AC-STEM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). The results revealed that the 5.54 nm diameter Co-Pt nanoparticles were evenly distributed on the surface of carbon nanotubes. Chronoamperometry (CA), linear scanning voltammetry (LSV), and cyclic voltammetry (CV) techniques were employed to assess the activity and stability of Co-Pt NPs/CNTs composites. Various Co-Pt NPs/CNTs composites were prepared by adjusting the ratio of Co-Pt. Through analysis of MOR performance, it was found that the Co3Pt1 NPs/CNTs composites exhibited superior catalytic activity with a mass activity of 4411 mA·mg−1Pt, which was 2.45 times higher than that of commercial Pt/C catalysts. This study introduced a novel approach for the preparation of high-performance Co-Pt bimetallic nanoparticles catalysts.

在这项研究中,通过在碳纳米管上负载二元纳米颗粒 Co-Pt 纳米颗粒,制备了 Co-Pt 纳米颗粒/碳纳米管(Co-Pt NPs/CNTs)复合材料。这些复合材料被用作甲醇电催化氧化反应(MOR)的高效催化剂。使用透射电子显微镜(TEM)、球面像差校正扫描(AC-STEM)、X 射线衍射(XRD)和 X 射线光电子能谱(XPS)分析了材料的形态。结果表明,直径为 5.54 nm 的 Co-Pt 纳米粒子均匀地分布在碳纳米管表面。为了评估 Co-Pt NPs/CNTs 复合材料的活性和稳定性,研究人员采用了时标法(CA)、线性扫描伏安法(LSV)和循环伏安法(CV)等技术。通过对 MOR 性能的分析发现,Co3Pt1 NPs/CNTs 复合材料具有优异的催化活性,其质量活性为 4411 mA-mg-1Pt,是商用 Pt/C 催化剂的 2.45 倍。该研究为制备高性能 Co-Pt 双金属纳米颗粒催化剂提供了一种新方法。
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引用次数: 0
Optoelectronic processes in ultrasonic spray coated organic solar cells 超声波喷涂有机太阳能电池中的光电过程
IF 4 3区 材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-08-30 DOI: 10.1016/j.synthmet.2024.117733
Gauri G. Bisen, Balaji V. Sanap, Milan S. Sonawane, Lekhamala D. Ingale, Anirudha M. Mangidkar, Jaydeep V. Sali, Sanjay S. Ghosh

In this work, the role of a high boiling point green solvent additive Diphenyl ether (DPE) in device recombination processes in organic solar cell, fabricated using ultrasonic spray coating method is investigated. Without DPE and with 2.4 % DPE, the device series resistance was high of the order of 104 Ω. With 0.3 %, 0.6 %, 1.2 % DPE, series resistance was less. Transient studies show that, for these contents, the rise and decay times of photocurrent was less than 5 µs. For 0.3 % DPE, nearly 3/4th photovoltage decayed with 51.4 µs lifetime and the remaining decays with 4.6 µs lifetime. With higher DPE content (1.2 %), 97 % photovoltage decay was with a longer lifetime 46.1 µs, and remaining with 1.6 µs. With further more DPE content (2.4 %), only 1 % TPV decays with shorter lifetime of 11.6 µs and 99 % decay is in longer time scale of 672 µs. In addition, a longer lifetime of over 1000 µs was also observed for this case, indicating the presence of deep traps, in addition to the shallow traps and bimolecular recombination. Morphology studies show that for 0 % and 0.3 % DPE content, stacked structure of droplets was formed in the film, but with 0.6 % and higher content, the progressively impinging droplets intermix with each other, providing more time for the film to dry. It was shown that the contribution of trap assisted recombination for varying DPE content was due to disordered PTB7 or PC71BM phases, indicating a competition between PTB7 aggregation and PC71BM dispersion in the coated film.

这项研究调查了高沸点绿色溶剂添加剂二苯醚(DPE)在使用超声波喷涂法制造的有机太阳能电池的器件重组过程中的作用。在不使用 DPE 和使用 2.4 % DPE 的情况下,器件的串联电阻高达 104 Ω。瞬态研究表明,对于这些含量,光电流的上升和衰减时间均小于 5 µs。对于 0.3 % 的 DPE,近四分之三的光电压在 51.4 微秒的寿命内衰减,其余的在 4.6 微秒的寿命内衰减。DPE 含量越高(1.2%),97% 的光电压衰减寿命为 46.1 微秒,其余为 1.6 微秒。当 DPE 含量进一步增加(2.4%)时,只有 1% 的热塑性硫化弹性体在 11.6 微秒的较短寿命内衰减,而 99% 的衰减在 672 微秒的较长时标内衰减。此外,在这种情况下还观察到超过 1000 µs 的较长寿命,这表明除了浅陷阱和双分子重组外,还存在深陷阱。形态学研究表明,在 DPE 含量为 0% 和 0.3% 的情况下,薄膜中会形成堆叠结构的液滴,但当 DPE 含量为 0.6% 或更高时,逐渐撞击的液滴会相互混合,从而为薄膜的干燥提供了更多时间。研究表明,在不同的 DPE 含量下,陷阱辅助重组的贡献是由无序的 PTB7 或 PC71BM 相造成的,这表明 PTB7 的聚集与 PC71BM 在涂膜中的分散之间存在竞争。
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引用次数: 0
Blue hyperphosphorescence based on green Ir(III) sensitizer with dual CF3 substituted imidazo[4,5-c]pyridin-2-ylidene cyclometalates 基于具有双 CF3 取代咪唑并[4,5-c]吡啶-2-亚基环金属盐的绿色 Ir(III) 感光剂的蓝色超磷光体
IF 4 3区 材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-08-30 DOI: 10.1016/j.synthmet.2024.117734
Jie Yan , Yangyang Xin , Yi Pan , Guowei Ni , Shek-Man Yiu , Yun Chi , Lian Duan , Kai Chung Lau

Hyperphosphorescent organic light-emitting diodes (HPOLEDs) are drawing increased attention, as the efficient Förster resonance energy transfer (FRET) from phosphorescent sensitizer to the narrowband fluorescent terminal emitter may give improved performances. In this work, we reported a class of Ir(III) phosphors based on the di-trifluoromethyl (CF3) substituted imidazo[4,5-c]pyridin-2-ylidene chelates; i.e., (L6F) and (L6FB). The f-isomers exhibited efficient blue emission with peak max. 443 − 462 nm, while m-counterparts exhibited green emission between 501 – 512 nm in degassed toluene solution. The theoretical calculation indicates divergent MLCT, LLCT and ILCT contributions for distinctive isomers. OLEDs based on dopant m-Ir(L6FB)3 exhibited green luminescence at 505 nm, EQEmax of 20.3 % and CIEx,y of (0.277, 0.462), while respective HPOLEDs with terminal emitter ν-DABNA showed blue hyperphosphorescence peaking at 468 nm, EQEmax of 25.2 %, CIEx,y of (0.174, 0.204) and EQE of 22.7 % at 1000 cd·m-2. Therefore, our finding demonstrates the effective conversion of the green electrophosphorescence to blue hyperphosphorescence via the rapid FRET process.

超磷光有机发光二极管(HPOLED)越来越受到人们的关注,因为从磷光敏化剂到窄带荧光末端发射器的高效佛斯特共振能量转移(FRET)可以提高发光二极管的性能。在这项工作中,我们报告了一类基于二三氟甲基(CF3)取代咪唑并[4,5-c]吡啶-2-亚基螯合物的 Ir(III) 荧光体,即 (L6F) 和 (L6FB)。f 异构体显示出高效的蓝色发射,最大峰值为 443 - 462 nm。在脱气甲苯溶液中,f-异构体显示出高效的蓝色发射,峰值最大为 443 - 462 nm,而 m-异构体则显示出 501 - 512 nm 的绿色发射。理论计算表明,不同异构体的 MLCT、LLCT 和 ILCT 贡献不同。基于掺杂剂 m-Ir(L6FB)3 的有机发光二极管在 505 纳米波长处发出绿色荧光,EQEmax 为 20.3 %,CIEx,y 为 (0.277, 0.462);而使用终端发射体 ν-DABNA 的相应 HPOLED 则在 468 纳米波长处发出蓝色超磷光,EQEmax 为 25.2 %,CIEx,y 为 (0.174, 0.204),1000 cd-m-2 时的 EQE 为 22.7 %。因此,我们的发现证明了绿色电致磷光通过快速 FRET 过程有效地转化为蓝色超磷光。
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Synthetic Metals
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