Pub Date : 2024-09-13DOI: 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.
{"title":"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","authors":"Preethi Dhanapal, Manju S.L.","doi":"10.1016/j.synthmet.2024.117752","DOIUrl":"10.1016/j.synthmet.2024.117752","url":null,"abstract":"<div><p>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 Cu<sup>2+</sup> over 20 other common metal ions in a CH<sub>3</sub>CN (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 Cu<sup>2+</sup>. 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 Cu<sup>2+</sup> ion.</p></div>","PeriodicalId":22245,"journal":{"name":"Synthetic Metals","volume":"309 ","pages":"Article 117752"},"PeriodicalIF":4.0,"publicationDate":"2024-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142271808","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}
Pub Date : 2024-09-12DOI: 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。
{"title":"Influence of nitrogen exchange in the core-shell structure of naphthalenediimide molecules on the advancement of quantum electronic properties","authors":"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","doi":"10.1016/j.synthmet.2024.117748","DOIUrl":"10.1016/j.synthmet.2024.117748","url":null,"abstract":"<div><p>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.</p></div>","PeriodicalId":22245,"journal":{"name":"Synthetic Metals","volume":"309 ","pages":"Article 117748"},"PeriodicalIF":4.0,"publicationDate":"2024-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142230184","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}
Pub Date : 2024-09-12DOI: 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.
{"title":"Enhancing device characteristics of InP quantum dot LED through structural modification with polyethylene glycol blend","authors":"Jaeseung Kim , Ji Ho Roh , Thi Na Le , Min Woo Hyeon , Bong Hoon Cha , Min Chul Suh , Hyunjung Kim","doi":"10.1016/j.synthmet.2024.117747","DOIUrl":"10.1016/j.synthmet.2024.117747","url":null,"abstract":"<div><p>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.</p></div>","PeriodicalId":22245,"journal":{"name":"Synthetic Metals","volume":"309 ","pages":"Article 117747"},"PeriodicalIF":4.0,"publicationDate":"2024-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142169258","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}
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.
{"title":"AC-driven QLED based on far-field effect of Au NPs","authors":"Yanyue Yao, Zebang Zhao, Xiaojie Gong, Dandan Song, Bo Qiao, Zheng Xu, Suling Zhao","doi":"10.1016/j.synthmet.2024.117749","DOIUrl":"10.1016/j.synthmet.2024.117749","url":null,"abstract":"<div><p>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/m<sup>2</sup> to 7234 cd/m<sup>2</sup>, representing a substantial increase of approximately 31.2 %. It demonstrates the great potential of the \"far-field\" effect in AC-driven QLEDs.</p></div>","PeriodicalId":22245,"journal":{"name":"Synthetic Metals","volume":"309 ","pages":"Article 117749"},"PeriodicalIF":4.0,"publicationDate":"2024-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142271822","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}
Pub Date : 2024-09-10DOI: 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.
{"title":"Thieno[3,2-b]thiophene flanked para-azaquinodimethane π-extended aromatic-quinoidal polymers","authors":"Bharath Dyaga , Witold Waliszewski , Zhitian Ling , Sasikumar Mayarambakam , Olivier Boyron , Wojciech Pisula , Bruno Schmaltz","doi":"10.1016/j.synthmet.2024.117751","DOIUrl":"10.1016/j.synthmet.2024.117751","url":null,"abstract":"<div><p>A series of thieno[3,2-<em>b</em>]thiophene (TT) flanked <em>para</em>-azaquinodimethane (<em>p</em>-AQM) based quinoidal conjugated polymers <strong>PAQM2TT-T</strong>, <strong>PAQM2TT-BT</strong> and <strong>PAQM3TT</strong> 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 cm<sup>2</sup> V<sup>−1</sup> s<sup>−1</sup> for <strong>PAQM2TT-T</strong>, 0.12 cm<sup>2</sup> V<sup>−1</sup> s<sup>−1</sup> for <strong>PAQM2TT-BT</strong> and 0.05 cm<sup>2</sup> V<sup>−1</sup> s<sup>−1</sup> for <strong>PAM3TT</strong>. This report presents an alternative π-extended quinoidal-donor strategy to control the molecular design and properties of new <em>p</em>-AQM-based conjugated polymers.</p></div>","PeriodicalId":22245,"journal":{"name":"Synthetic Metals","volume":"309 ","pages":"Article 117751"},"PeriodicalIF":4.0,"publicationDate":"2024-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142271823","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}
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.
{"title":"Preparation and infrared shielding of polyaniline@MWCNTs flexible electrochromic device based on cotton fabric","authors":"Mengjie Li, Wei Jiang, Yun Lin, Changhui Li, Xue Liu, Qiongzhen Liu, Wenwen Wang, Liyan Yang, Yuedan Wang, 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}
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 , C.E. Sánchez-Rodríguez , R. López-Sandoval , 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}
Pub Date : 2024-09-05DOI: 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.
{"title":"Efficient electrooxidation of methanol by Co-Pt bimetallic nanoparticles loaded on carbon nanotubes in alkaline environment","authors":"Shuiyan Ning, Guiqi Gao, Ruiwen Yan","doi":"10.1016/j.synthmet.2024.117736","DOIUrl":"10.1016/j.synthmet.2024.117736","url":null,"abstract":"<div><p>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 Co<sub>3</sub>Pt<sub>1</sub> NPs/CNTs composites exhibited superior catalytic activity with a mass activity of 4411 mA·mg<sup>−1</sup><sub>Pt</sub>, 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.</p></div>","PeriodicalId":22245,"journal":{"name":"Synthetic Metals","volume":"309 ","pages":"Article 117736"},"PeriodicalIF":4.0,"publicationDate":"2024-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142150843","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}
Pub Date : 2024-08-30DOI: 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.
{"title":"Optoelectronic processes in ultrasonic spray coated organic solar cells","authors":"Gauri G. Bisen, Balaji V. Sanap, Milan S. Sonawane, Lekhamala D. Ingale, Anirudha M. Mangidkar, Jaydeep V. Sali, Sanjay S. Ghosh","doi":"10.1016/j.synthmet.2024.117733","DOIUrl":"10.1016/j.synthmet.2024.117733","url":null,"abstract":"<div><p>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 10<sup>4</sup> 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 PC<sub>71</sub>BM phases, indicating a competition between PTB7 aggregation and PC<sub>71</sub>BM dispersion in the coated film.</p></div>","PeriodicalId":22245,"journal":{"name":"Synthetic Metals","volume":"308 ","pages":"Article 117733"},"PeriodicalIF":4.0,"publicationDate":"2024-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142095770","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}
Pub Date : 2024-08-30DOI: 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.
{"title":"Blue hyperphosphorescence based on green Ir(III) sensitizer with dual CF3 substituted imidazo[4,5-c]pyridin-2-ylidene cyclometalates","authors":"Jie Yan , Yangyang Xin , Yi Pan , Guowei Ni , Shek-Man Yiu , Yun Chi , Lian Duan , Kai Chung Lau","doi":"10.1016/j.synthmet.2024.117734","DOIUrl":"10.1016/j.synthmet.2024.117734","url":null,"abstract":"<div><p>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 (CF<sub>3</sub>) substituted imidazo[4,5-<em>c</em>]pyridin-2-ylidene chelates; i.e., (<strong>L</strong><sub><strong>6F</strong></sub>) and (<strong>L</strong><sub><strong>6F</strong></sub><strong>B</strong>). The <em>f</em>-isomers exhibited efficient blue emission with peak max. 443 − 462 nm, while <em>m</em>-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 <em><strong>m</strong></em><strong>-Ir(L</strong><sub><strong>6F</strong></sub><strong>B)</strong><sub><strong>3</strong></sub> exhibited green luminescence at 505 nm, EQE<sub>max</sub> of 20.3 % and CIE<sub>x,y</sub> of (0.277, 0.462), while respective HPOLEDs with terminal emitter ν-DABNA showed blue hyperphosphorescence peaking at 468 nm, EQE<sub>max</sub> of 25.2 %, CIE<sub>x,y</sub> of (0.174, 0.204) and EQE of 22.7 % at 1000 cd·m<sup>-2</sup>. Therefore, our finding demonstrates the effective conversion of the green electrophosphorescence to blue hyperphosphorescence via the rapid FRET process.</p></div>","PeriodicalId":22245,"journal":{"name":"Synthetic Metals","volume":"308 ","pages":"Article 117734"},"PeriodicalIF":4.0,"publicationDate":"2024-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142129574","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}