Synthetic Metals最新文献

{"title":"EMI shielding study of PVC-PT-Ag/ZnS nanocomposites in microwave region","authors":"Hafiz Muhammad Fayzan Shakir ,&nbsp;Aiman Fatima ,&nbsp;Muhammad Zahid ,&nbsp;Zulfiqar Ahmad Rehan ,&nbsp;Sohad Abdulkaleg Alshareef ,&nbsp;Mohamed El-Sharnouby","doi":"10.1016/j.synthmet.2024.117687","DOIUrl":"https://doi.org/10.1016/j.synthmet.2024.117687","url":null,"abstract":"<div><p>Chemical oxidative polymerization and hydrothermal methods were employed to synthesize polythiophene (PT) and silver-doped zinc sulfide (Ag/ZnS) nanoparticles for electromagnetic interference (EMI) shielding applications. Composite films based on PVC were fabricated by incorporating these nanoparticles, both Ag/ZnS and PT-Ag/ZnS. Initially, X-ray diffraction and zetasizer technology were utilized to analyze the crystal structure and particle size of these nanoparticles. Subsequently, the nanocomposite films were assessed for various properties, including electrical conductivity and transmittance in the near-infrared wavelength range of 200–800 nm, as well as their effectiveness in shielding electromagnetic interference in the microwave frequency range of 0.1–20 GHz. The aforementioned features were investigated using DC conductivity, vector network analysis, and NIR spectroscopy. It was discovered that both conductance and shielding effectiveness increased to 0.029 S/cm and 54 dB, respectively, as the nanoparticle density increased. At 20 wt% PT-Ag/ZnS, the maximum attenuation value within the 0.1–20 GHz frequency band reached 54 dB, with transmittance below 0.5 %.</p></div>","PeriodicalId":22245,"journal":{"name":"Synthetic Metals","volume":"307 ","pages":"Article 117687"},"PeriodicalIF":4.0,"publicationDate":"2024-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141542777","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A highly sensitive polydentate ligand-based fluorescent probe for imaging of Hg2+ in Arabidopsis thaliana","authors":"Xianjiao Meng,&nbsp;Yaru Zhang,&nbsp;Jingjing Li","doi":"10.1016/j.synthmet.2024.117689","DOIUrl":"https://doi.org/10.1016/j.synthmet.2024.117689","url":null,"abstract":"<div><p>A novel fluorescent chemosensor (<em>E</em>)-2-((3-((bis(pyridin-2-ylmethyl)amino)methyl)-2-hydroxy-5-methylbenzylidene)amino)-3′, 6′-bis(diethylamino)spiro[isoindoline-1, 9′-xanthen]-3-one (<strong>RPA)</strong> was synthesized through traditional Schiff base preparation methods and characterized by ¹H NMR, ¹³C NMR and ESI-MS. Sensor <strong>RPA</strong> showed obvious fluorescence enhancement response to Hg²⁺ in aqueous solution, and the detection limit was 0.8 μM. The results of Job curve indicated that sensor <strong>RPA</strong> and Hg²⁺ ion coordinated with each other with a binding stoichiometry of 1:1, and the optimal pH range was from 4 to 9. The results of paper strip suggested that sensor <strong>RPA</strong> could been used for effective naked-eye detection of Hg²⁺ and showed low toxicity and good biocompatibility with <em>Arabidopsis thaliana</em>.</p></div>","PeriodicalId":22245,"journal":{"name":"Synthetic Metals","volume":"307 ","pages":"Article 117689"},"PeriodicalIF":4.0,"publicationDate":"2024-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141485581","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The electrochemical performance of gallium nitride composited with g-C3N4 in bulk and oxidized forms for supercapacitors","authors":"Zahra Salehi Rozveh ,&nbsp;Morteza Moradi ,&nbsp;Mehran Keyhan ,&nbsp;Vahid Safarifard ,&nbsp;Peyman Yaghoubizadeh ,&nbsp;Mohamad Javad Eshraghi","doi":"10.1016/j.synthmet.2024.117686","DOIUrl":"https://doi.org/10.1016/j.synthmet.2024.117686","url":null,"abstract":"<div><p>Six composites were synthesized using g-C₃N₄ in two forms, namely Bulk and Oxidized, mixed with gallium nitride, and composites of materials were employed as electrode components for supercapacitors. The composites' physical and structural characteristics were analyzed and the electrochemical performance of composite materials containing varying ratios of GaN and g-C₃N₄ was analyzed. Galvanostatic charge-discharge investigations revealed that the Oxidized g-C₃N₄/GaN-1:2 composite exhibited a superior maximum specific capacitance compared to other electrode materials, achieving 200 F g⁻¹ at a current density of 2 A g⁻¹, which suggest that mixing GaN with different forms of g-C₃N₄ (Bulk and Oxidized) have the potential to produce favorable electrode materials suitable for application in electrochemical supercapacitors. The device demonstrated a remarkable high energy density of 1.5 µWh cm^-² at a power density of 327.9 mW cm^-², along with exceptional long-term durability.</p></div>","PeriodicalId":22245,"journal":{"name":"Synthetic Metals","volume":"307 ","pages":"Article 117686"},"PeriodicalIF":4.0,"publicationDate":"2024-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141485583","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"New conjugated copolymer MEH-PPV-P3HT with donor-acceptor system for organic optoelectronics applications: Experimental and theoretical study","authors":"M. Ltayef ,&nbsp;M. Almoneef ,&nbsp;M. Mbarek ,&nbsp;K. Alimi","doi":"10.1016/j.synthmet.2024.117684","DOIUrl":"https://doi.org/10.1016/j.synthmet.2024.117684","url":null,"abstract":"<div><p>Donor-acceptor architecture was designed of new diblocks copolymer MEH-PPV-P3HT synthesis. The new copolymer was elaborated through oxidative pathway. The correlation structure-properties and their potential photophysical characteristics of the obtained material were reported utilizing several characterization analyses (InfraRed, Raman, TGA, UV visible spectroscopy, as well as PL and TRPL). To define the model's geometric structure, vibrational, and optoelectronic properties of the studied copolymer, Density Functional Theory DFT and Time-dependent Density Functional Theory TD-DFT approach were carried out. The obtained copolymer exhibits great thermal stability and substantial absorption in the visible range. An energy gap lower than the original materials by the amount of 1.74 eV which proves the presence of the charge transfer process. In addition, due to Forster energy transfer from the MEH-PPV to the P3HT an enhancement of the exciton average lifetime was detected. The obtained results from the copolymer characterization suggest a potential for application in organic optoelectronic devices. A good accordance between experimental and theoretical results based DFT calculations is obtained.</p></div>","PeriodicalId":22245,"journal":{"name":"Synthetic Metals","volume":"307 ","pages":"Article 117684"},"PeriodicalIF":4.0,"publicationDate":"2024-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141480290","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Molybdenum trioxide/carbon nanotubes/poly (5-carboxylindole) (MoO3/MWCNT-COOH/P5ICA) nanocomposites as an electrode material for high-performance hybrid supercapacitors","authors":"Xukun Deng,&nbsp;Yanmei Cheng,&nbsp;Chunhui Du,&nbsp;Junde Zhang,&nbsp;Dandan Liu,&nbsp;Guangming Nie","doi":"10.1016/j.synthmet.2024.117683","DOIUrl":"https://doi.org/10.1016/j.synthmet.2024.117683","url":null,"abstract":"<div><p>Molybdenum trioxide/carboxyl functionalized carbon multi-wall nanotubes/poly(5-carboxylindole) (MoO₃/MWCNT-COOH/P5ICA) ternary composites were prepared as supercapacitor electrodes by hydrothermal and electrochemical polymerization methods. When three materials are composite used as electrodes for supercapacitors, the advantages of each material can be effectively integrated, resulting in low impedance and high capacitance characteristics. After optimizing the electrochemical polymerization time of P5ICA, the maximum specific capacitance of the composite electrode can reach 165.6 mF cm⁻². The symmetric supercapacitor constructed with composite electrodes demonstrates a maximum specific capacitance of 61.0 mF cm⁻², and the area specific capacitance can remain 74 % of the original after 1000 charge and discharge cycles. This study provides a feasible scheme for preparing high performance supercapacitor materials.</p></div>","PeriodicalId":22245,"journal":{"name":"Synthetic Metals","volume":"307 ","pages":"Article 117683"},"PeriodicalIF":4.0,"publicationDate":"2024-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141485582","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Broken crystal symmetry of MWCNTs as the key factor in improvement of carboxyl functionalization","authors":"Nadezhda G. Bobenko ,&nbsp;Vladislav V. Shunaev ,&nbsp;Petr M. Korusenko ,&nbsp;Valeriy E. Egorushkin ,&nbsp;Olga E. Glukhova","doi":"10.1016/j.synthmet.2024.117677","DOIUrl":"https://doi.org/10.1016/j.synthmet.2024.117677","url":null,"abstract":"<div><p>Carbon nanotubes functionalized with carboxyl groups (COOH-CNTs) find their application in energy storage, sensing, improving mechanical stability and biomedicine. So a facilitation of COOH-groups bonding to CNTs is one the modern scientific challenges. In this study untreated multi-walled CNT (MWCNTs), nitrogen-doped MWCNT (N-MWCNTs) and ion-beam irradiated N-MWCNTs (irr-N-MWCNTs) were synthesized using the CVD method. Characterizations were performed via HRTEM, Raman, XPS, and NEXAFS spectroscopy. Irr-N-MWCNTs demonstrated the largest amount of carbon crystallites, the presence of Stone-Wales defects as well as the regions of tensile-compressive, shear and torsional deformation. All these factors contributed to increase of carboxyl functionalization at the tube’s surface. On the base of experimental data, the atomic supercells of N-MWCNTs and irr-N-MWCNTs were built by the self-consistent-charge density-functional tight-binding method (SCC DFTB). Through SCC DFTB, we quantified atomic rearrangements, electronic structures, charge transfers, total energies, and the forces and energy barriers relevant to COOH bonding. The twisting of irr-N-MWCNTs supercells by 45 degrees decreased the barrier to the carboxyl formation in 2.5 times in comparison to undeformed nanotubes. Our findings reveal that nitrogen addition, ion-beam irradiation, and induced deformations create the necessary conditions for COOH functionalization by altering the physicochemical surface properties of MWCNTs.</p></div>","PeriodicalId":22245,"journal":{"name":"Synthetic Metals","volume":"307 ","pages":"Article 117677"},"PeriodicalIF":4.0,"publicationDate":"2024-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141480289","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Recent progress in p-type doped conjugated polymer-based thermoelectric thin films","authors":"Wei-Ni Wu ,&nbsp;Qing-Bao Zheng ,&nbsp;Cheng-Liang Liu","doi":"10.1016/j.synthmet.2024.117682","DOIUrl":"https://doi.org/10.1016/j.synthmet.2024.117682","url":null,"abstract":"<div><p>Organic thermoelectric materials have garnered considerable attention in recent years for their potential in harvesting low-grade waste heat. The exploration of efficient and sustainable energy conversion technologies has prompted a significant interest in conjugated polymers (CPs) due to their tunable chemical structures, cost-effectiveness, environmental friendliness, light-weight, mechanically flexible and stretchable, high Seebeck coefficients, and low thermal conductivities, making them promising for organic thermoelectric devices. The optimization of the power factor in organic thermoelectric devices necessitates the incorporation of doping agents, which facilitates the intentional introduction of charge carriers in order to manipulate the electrical conductivity of the CP. The present review explores the recent developments in p-type doped CP-based thermoelectric thin films, with a particular emphasis on the intricate relationship between modifications of the chemical structure and the resultant thermoelectric properties, including electrical conductivities and power factors. Furthermore, various doping strategies, including doping processing methods and dopant structure engineering, are thoroughly examined. The comprehensive analysis presented herein contributes to the collective understanding of doped CP-based thermoelectric thin films, and offers insights into potential avenues for future research and development in this dynamically evolving field.</p></div>","PeriodicalId":22245,"journal":{"name":"Synthetic Metals","volume":"307 ","pages":"Article 117682"},"PeriodicalIF":4.0,"publicationDate":"2024-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141438223","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Study of direct current charge transport mechanism in a series of iridium metal complexes based on varying ancillary and cyclometalated ligands","authors":"Ankit Kumar Rao,&nbsp;Amarjeet Kaur","doi":"10.1016/j.synthmet.2024.117680","DOIUrl":"10.1016/j.synthmet.2024.117680","url":null,"abstract":"<div><p>The mechanism of charge transport in a series of iridium metal complexes prepared with varying ancillary and cyclometalated ligands is reported here. The structural conformation of the synthesized complexes is acquired via NMR spectroscopy and elemental analysis. The photophysical properties of the samples are investigated through UV–visible and photoluminescence spectroscopy. The investigation of the temperature-dependent dc electrical conductivity of the samples is conducted within the temperature range of 280–473 K. The room temperature conductivity of all samples is determined to be of the order ∼10⁻⁸ S/cm. All the complexes exhibit semiconducting behavior in a certain temperature range above room temperature. A continued elevation in temperature leads to reduction in the conductivity of all the samples resulting in metal-like conduction behavior above a certain temperature. The transition temperature of the iridium metal complexes is attributed to the removal of the coordinated water molecule from the samples as suggested by thermal analysis of the complexes. The removal of water molecule from the sample is expected to localize the electron densities which consequently results in a fall of the conductivity in the samples. The conduction mechanism in the samples is analyzed in the light of band conduction mechanism and Mott’s variable range hopping model. All the samples are found to obey 1-D VRH mechanism. The activation energy and the corresponding Mott’s parameters are derived from the ln σ vs 1/T curves.</p></div>","PeriodicalId":22245,"journal":{"name":"Synthetic Metals","volume":"307 ","pages":"Article 117680"},"PeriodicalIF":4.0,"publicationDate":"2024-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141402179","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Two-photon absorption induced optical limiting action of Ag-doped lanthanum molybdate decorated reduced graphene oxide nanocomposites","authors":"A.S. Jayasree ,&nbsp;N. Angeline Little Flower ,&nbsp;R. Annie Sujatha ,&nbsp;T.C. Sabari Girisun ,&nbsp;K. Mani Rahulan","doi":"10.1016/j.synthmet.2024.117681","DOIUrl":"10.1016/j.synthmet.2024.117681","url":null,"abstract":"<div><p>In this research, we aimed to investigate the linear and non-linear optical properties of Ag-La₂(MoO₄)₃@RGO nanocomposites. For this purpose, Graphene Oxide (GO) was synthesized by Modified Hummer’s method after which GO was chemically reduced to Reduced graphene oxide (RGO). The nanocomposite Ag-doped La₂(MoO₄)₃ is prepared by a simple and facile co-precipitation method. The prepared nanocomposite was characterized by Fourier transform infrared (FTIR), Ultraviolet-Visible (UV-Vis) absorption, X-ray diffraction (XRD), Scanning electron microscope (SEM), and energy dispersive X-ray spectroscopy (EDX). XRD and EDX analysis indicated the reduction of GO and successful synthesis of Ag-doped La₂(MoO₄)₃ nanocomposite. FESEM images portray the presence of thin layers of graphene sheets and Ag-doped La₂(MoO₄)₃ on the sheets of reduced graphene oxide. Ground state absorption studies show that the reduction of graphene oxide causes a hypsochromic shift in the absorption maxima of the graphene layers. The photoluminescence of Ag- La₂(MoO₄)₃@RGO demonstrates the utmost emission in the UV range caused by the valence band and conduction band's direct transitions in the band gap region. Z-scan method using Nd: YAG laser exposes that both nanocomposite and specific counterparts hold reverse saturable absorption behaviour. The source of optical limiting action is attributed to the excited state absorption process, emerging from the influence of the plasmon resonance state of Ag nanoparticles. Strong nonlinear absorption and lower onset limiting threshold make the Ag-La₂(MoO₄)₃@RGO nanocomposite desirable material for laser safety devices.</p></div>","PeriodicalId":22245,"journal":{"name":"Synthetic Metals","volume":"307 ","pages":"Article 117681"},"PeriodicalIF":4.0,"publicationDate":"2024-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141391224","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Porous polyaniline/flower-like hybrid phase MoS2/phosphorus-doped graphene ternary nanocomposite for efficient room temperature ammonia sensors","authors":"Ravinder Singh ,&nbsp;Sunil Agrohiya ,&nbsp;Ishpal Rawal ,&nbsp;Anil Ohlan ,&nbsp;Sajjan Dahiya ,&nbsp;R. Punia ,&nbsp;A.S. Maan","doi":"10.1016/j.synthmet.2024.117676","DOIUrl":"10.1016/j.synthmet.2024.117676","url":null,"abstract":"<div><p>Ammonia, a ubiquitous gas with diverse industrial applications, demands reliable and cost-effective sensing technologies for monitoring and control. In this context, this study presents the development of a novel ternary nanocomposite comprised of porous polyaniline (PANI), hybrid phase molybdenum disulfide (MoS₂), and phosphorus-doped graphene (PGO) for the realization of highly efficient room temperature ammonia sensors. The synergistic combination of these three materials leverages their individual properties, such as high surface area, excellent electrical conductivity, and enhanced catalytic activity, to create a robust sensing platform. The PANI/1 T-2 H MoS₂/PGO nanocomposites were synthesized by a combination of solvothermal processing and in-situ polymerization techniques. The morphological and structural characteristics of the PANI/1 T-2 H MoS₂/PGO nanocomposites were conducted using advanced analytical techniques, that include, Scanning Electron Microscopy (SEM), X-ray Diffraction (XRD), Raman spectroscopy, Transmission Electron Microscopy (TEM), and X-ray Photoelectron Spectroscopy (XPS), and Brunauer-Emmett-Teller method (BET). The enhanced surface area of PANI/1 T-2 H MoS₂/PGO (54.72 m²/g) compared to PANI (31.8 m²/g) has a positive impact on the sensing characteristics of PANI/1 T-2 H MoS₂/PGO. The PANI/1 T-2 H MoS₂/PGO nanocomposite sensor has shown sensing response values of ∼1070 %, response time of 12 s, recovery time of 30 s towards 100 ppm of NH_3, and detection limit is 0.01 ppm (10 ppb). A highly linear gas response of the PANI/1 T-2 H MoS₂/PGO sensor is observed in a range of 10–100 ppm ammonia concentration. The development of the PANI/1 T-2 H MoS₂/PGO nanocomposite sensor aims to meet the increasing need for temperature-efficient, cost-effective, and energy-efficient gas sensing technologies that can be used in various fields including environmental monitoring and industrial safety.</p></div>","PeriodicalId":22245,"journal":{"name":"Synthetic Metals","volume":"307 ","pages":"Article 117676"},"PeriodicalIF":4.4,"publicationDate":"2024-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141398514","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}