Synthetic MetalsPub Date : 2024-06-09DOI: 10.1016/j.synthmet.2024.117678
Lewis M. Cowen , Megan M. Westwood , Pauline M.F. Kasongo-Ntumba , Irena Nevjestic , Peter A. Gilhooly-Finn , Sandrine Heutz , Oliver Fenwick , Bob C. Schroeder
{"title":"Diketopyrrolopyrrole based molecular semiconductors with intrinsic conductivity","authors":"Lewis M. Cowen , Megan M. Westwood , Pauline M.F. Kasongo-Ntumba , Irena Nevjestic , Peter A. Gilhooly-Finn , Sandrine Heutz , Oliver Fenwick , Bob C. Schroeder","doi":"10.1016/j.synthmet.2024.117678","DOIUrl":"10.1016/j.synthmet.2024.117678","url":null,"abstract":"<div><p>Intrinsically conducting diketopyrrolopyrrole (DPP) compounds functionalised with pendant quaternary ammonium groups have been synthesised. The hydroxide forms were found to be the product of base hydrolysis of the DPP amide during synthesis, likely made possible by restricted resonance. This gave mixed chemical compositions of solutions and conductive films formed by drop-casting. Chemical decomposition of the hydrolysed compounds was also observed at temperatures above 85 °C. Conductivities of approximately 3 × 10<sup>−4</sup> S m<sup>−1</sup> were observed in processed films of DPP ammonium hydroxides. It was also found that trifluoroacetic acid (TFA) DPP precursors gave clear electron paramagnetic resonance (EPR) signals indicative of doping and exhibited conductivities one order of magnitude larger than the hydroxides. This opens the possibility of using ammonium TFAs as moieties for doping organic semiconductors.</p></div>","PeriodicalId":22245,"journal":{"name":"Synthetic Metals","volume":"307 ","pages":"Article 117678"},"PeriodicalIF":4.4,"publicationDate":"2024-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0379677924001401/pdfft?md5=392854de772f88210136f3a2881fab54&pid=1-s2.0-S0379677924001401-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141411558","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Synthetic MetalsPub Date : 2024-06-09DOI: 10.1016/j.synthmet.2024.117679
Faiza Shoukat , Azmat Ali , Jin Hee Lee , Yeasin Khan , Bright Walker , Jung Hwa Seo
{"title":"Ag:PSS polyelectrolyte/PTB7 bilayers as efficient hole transport layers for perovskite solar cells","authors":"Faiza Shoukat , Azmat Ali , Jin Hee Lee , Yeasin Khan , Bright Walker , Jung Hwa Seo","doi":"10.1016/j.synthmet.2024.117679","DOIUrl":"https://doi.org/10.1016/j.synthmet.2024.117679","url":null,"abstract":"<div><p>By virtue of the exceptional optical and electrical features of organic-inorganic lead-halide perovskites, the power conversion efficiency (PCE) of perovskite solar cells (PeSCs) has surpassed that of commercialized single junction silicon solar cells. Although PeSCs have demonstrated exceptional efficiency, there is still room for improvement to approach the theoretical Shockley-Queisser limit. Additionally, there is a need for the development of cost-effective strategies to produce high-performance devices, enabling PeSCs to fulfill their potential as a widely adopted and sustainable energy source.</p><p>Considering this, in this work, we’ve developed a polyelectrolyte (silver poly(styrene sulfonate (PSS)) (Ag:PSS) hole transport layer (HTL), and investigated it in combination with a conjugated polymer,poly[4,8-bis[(2-ethylhexyl)oxy]benzo[1,2-b:4,5-<em>b</em>]-dithiophene-2,6-diyl][3-fluoro-2-[(2-ethylhexyl)carbonyl]thieno[3,4-<em>b</em>]thiophenediyl] (PTB7) as a bilayer HTL. Ag:PSS alone performs poorly due to mismatched energy levels at the anode interface, however, when PTB7 is used in combination with Ag:PSS, effective extraction and transport of carriers towards the anode is achieved. PeSCs with optimized bilayer HTLs (Ag:PSS/PTB7) gave PCEs of up to 17.09 %, higher than that of the Ag:PSS alone (reference device 12.13 %) which can be attributed to improved interfacial energetics at the HTL/perovskite interface.</p></div>","PeriodicalId":22245,"journal":{"name":"Synthetic Metals","volume":"307 ","pages":"Article 117679"},"PeriodicalIF":4.4,"publicationDate":"2024-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141323257","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}
Synthetic MetalsPub Date : 2024-06-06DOI: 10.1016/j.synthmet.2024.117674
Intasab Farooq , M.U. Islam , Muhammad Danish , Farooq Ahmad , I.H. Gul , M. Azhar Khan
{"title":"Synergistic effects of Li-based ferrite and graphene oxide in microwave absorption applications","authors":"Intasab Farooq , M.U. Islam , Muhammad Danish , Farooq Ahmad , I.H. Gul , M. Azhar Khan","doi":"10.1016/j.synthmet.2024.117674","DOIUrl":"https://doi.org/10.1016/j.synthmet.2024.117674","url":null,"abstract":"<div><p>The successful fabrication of composites consisting of ferrites with a composition of Li<sub>0.4</sub>Mg<sub>0.25</sub>Zn<sub>0.25</sub>Fe<sub>2.2</sub>O<sub>4</sub> and Graphene oxide was carried out using the ultra-sonication technique. The current study examined the impact of graphene oxide in spinel ferrite employing X-ray diffraction, dielectric, and magnetic susceptibility studies. The X-ray diffraction investigation confirmed the spinel phase formation in ferrite and graphene oxide synthesis. The measured range for the size of crystallites was found to be between 48.43 and 30.07 nm. The DC resistivity of cubic ferrite at room temperature was determined to be 1.715 ×10<sup>10</sup> ohm-cm by a two-probe approach. Furthermore, it was observed that the resistivity fell significantly as the content of graphene oxide increased. The dielectric constant exhibited behavior consistency with the Maxwell-Wagner phenomenon of interfacial polarization. The rise in graphene oxide content in ferrite results in high AC conductivity of composites due to the relatively large value of conductivity of graphene oxide and the improved charge hopping mechanism. The magnetic susceptibility of all the samples demonstrated a progressive decline as the temperature increased, which can be attributed to the disruption of spin alignment at the Curie temperature. The observed Curie temperature of all samples was 413–473 K. Integrating spinel ferrite with Graphene oxide has significantly improved the magneto-electrical characteristics, indicating potential applications in supercapacitors, high-frequency electromagnetic devices, and microwave absorption.</p></div>","PeriodicalId":22245,"journal":{"name":"Synthetic Metals","volume":"307 ","pages":"Article 117674"},"PeriodicalIF":4.4,"publicationDate":"2024-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141290242","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}
Synthetic MetalsPub Date : 2024-06-06DOI: 10.1016/j.synthmet.2024.117675
Olga V. Sedelnikova, Dmitriy V. Gorodetskiy, Alexander N. Lavrov, Maria A. Grebenkina, Anastasiya D. Fedorenko, Lyubov G. Bulusheva, Alexander V. Okotrub
{"title":"Transformation of the diamond surface with a thin iron coating during annealing and transport properties of the formed conductive layer","authors":"Olga V. Sedelnikova, Dmitriy V. Gorodetskiy, Alexander N. Lavrov, Maria A. Grebenkina, Anastasiya D. Fedorenko, Lyubov G. Bulusheva, Alexander V. Okotrub","doi":"10.1016/j.synthmet.2024.117675","DOIUrl":"10.1016/j.synthmet.2024.117675","url":null,"abstract":"<div><p>In our study, we annealed polycrystalline diamond films with nanometer-thick iron coatings. Based on analysis of X-ray photoelectron spectroscopy data the presence of two catalytic processes was suggested. One is the continuous absorption of sp<sup>3</sup> carbon by iron nanoparticles with subsequent extrusion of the sp<sup>2</sup> phase from the formed iron carbide, which leads to the creation of deep tracks into the diamond bulk that are filled with graphite stacks. The other process involves a thin layer of iron carbide on the surface and results in the creation of sp<sup>2</sup> layers, which are made up of fused graphene-like patches and are oriented mainly along the surface of the diamond film. For the sample annealed at 800 °C for 1 h, the sp<sup>2</sup> layers formed exhibit semi-metallic conductivity with quantum corrections caused by disorders. At the same time, no evidence of iron contribution in conductivity of the annealed Fe-coated film was detected, implying that upon transforming the diamond, iron moved quite deep into the bulk. In addition, the formed conductive layer on the diamond surface shows mechanical stability, ensuring the reproducibility of conductivity measurements even after six months of storage in air. The study has revealed the potential for targeted metal-assisted formation of sp<sup>2</sup> carbon-based conducting pathways on diamond surfaces for electronic devices.</p></div>","PeriodicalId":22245,"journal":{"name":"Synthetic Metals","volume":"307 ","pages":"Article 117675"},"PeriodicalIF":4.4,"publicationDate":"2024-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141407420","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}
Synthetic MetalsPub Date : 2024-06-05DOI: 10.1016/j.synthmet.2024.117673
Aliaa M. Salem , Sayed Y. Attia , Amira Gaber , Saad G. Mohamed , Soliman I. El-Hout
{"title":"In-situ-assembled polyaniline frameworks on reduced graphene oxide toward high-performance energy-storage materials","authors":"Aliaa M. Salem , Sayed Y. Attia , Amira Gaber , Saad G. Mohamed , Soliman I. El-Hout","doi":"10.1016/j.synthmet.2024.117673","DOIUrl":"https://doi.org/10.1016/j.synthmet.2024.117673","url":null,"abstract":"<div><p>PANI exhibited considerable potential in the conversion and storage of energy systems because of its high elasticity, large specific capacitance, multiple oxidation states, and relatively inexpensive. Unfortunately, PANI's poor stability restricts its usage. The coupling of PANI and other active materials has the potential to overcome PANI's inherent limitations. Here, we successfully synthesized reduced graphene oxide (rGO) that was utilized as a carbon substrate for in situ chemical polymerization of PANI at different operating temperatures [0°C, room temperature (RT), and 50°C]. The fabricated PANI-RT/rGO nanocomposite showed a high porosity with a high surface area, acting as an ions diffusion pathway. The estimated electrochemical results of the prepared electrodes, PANI-RT, PANI-50, PANI-0, and PANI-RT/rGO electrodes at an applied current of 2 A.g<sup>−1</sup> are 832 F.g<sup>−1</sup> (418 C/g), 256 F.g<sup>−1</sup> (128 C/g), and 224 F.g<sup>−1</sup> (112 C/g), and 1056 F.g<sup>−1</sup> (528 C/g), respectively. The capacitance of the PANI-RT/rGO electrode is much larger than that of the others, and rGO incorporation demonstrates a key factor in improving the electrochemical storage capability. Furthermore, the device is stable, keeping 90 % of its original capacity following 3 K charge/discharge repeated runs at 5 A g<sup>−1</sup>.</p></div>","PeriodicalId":22245,"journal":{"name":"Synthetic Metals","volume":"307 ","pages":"Article 117673"},"PeriodicalIF":4.4,"publicationDate":"2024-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141290241","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}
Synthetic MetalsPub Date : 2024-06-04DOI: 10.1016/j.synthmet.2024.117665
Swellam W. Sharshir , Heba G. El-Attar , Ali Basem , Ahmed A. El-Naggar , Abdulrhman M. Alaraj , Ahmed Attia , Lotfy A. Lotfy , Wissam H. Alawee , Hasan Sh. Majdi , A.S. Abdullah , Mahmoud Abdelfatah , Abdelhamid El-Shaer , Hany Koheil
{"title":"An overview of the progress in the synthesis of nanocomposites for industrial applications: Techniques preparation, definitions, and characterization","authors":"Swellam W. Sharshir , Heba G. El-Attar , Ali Basem , Ahmed A. El-Naggar , Abdulrhman M. Alaraj , Ahmed Attia , Lotfy A. Lotfy , Wissam H. Alawee , Hasan Sh. Majdi , A.S. Abdullah , Mahmoud Abdelfatah , Abdelhamid El-Shaer , Hany Koheil","doi":"10.1016/j.synthmet.2024.117665","DOIUrl":"https://doi.org/10.1016/j.synthmet.2024.117665","url":null,"abstract":"<div><p>High-performance materials called nanocomposites have unique features. Nanocomposites are in high demand in plastic engineering, with an anticipated periodic growth rate of 25 %. Its potential is so great that it is useful in numerous operations, from packaging to biomedical operations. It is anticipated that similar equipment and other intriguing operations will be required. The operations of nanocomposites display new specialized and marketable potential for numerous electronics, automotive, aerospace, and biotechnology sectors because of their environmental friendliness. Some studies on water uptake have shown that both ZnO nanorods and polymer polyaniline (PANI) function to prevent up to 75 % of liquid from penetrating the paint layer. With 4 % MWCNT content, a polypyrrole-multiwalled carbon nanotube (PPy-MWCNT) nanocomposites sensor was developed that was most sensitive to NH<sub>3</sub> gas. The produced material maintained 86.9 % of its starting specific capacitance. The graphene quantum dots (GQDs) composite results show that the high charge storage retention is 91.45 %. This paper will explain the importance of using nanocomposites in industry applications where the paper decides on coating, sensors, and energy storage.</p></div>","PeriodicalId":22245,"journal":{"name":"Synthetic Metals","volume":"307 ","pages":"Article 117665"},"PeriodicalIF":4.4,"publicationDate":"2024-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141290240","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}
Synthetic MetalsPub Date : 2024-06-03DOI: 10.1016/j.synthmet.2024.117663
The Thai Nguyen , Thanh-Tam Thi Huynh , Viet-Ha Thi Le , Khuong Quoc Vo , Phuong Hoang Tran
{"title":"Gold-decorated carbon material for enhanced catalytic performance of cyclization/oxidation of 2-aminophenol, 2-aminothiophenol, and 2-aminoaniline with aromatic aldehydes","authors":"The Thai Nguyen , Thanh-Tam Thi Huynh , Viet-Ha Thi Le , Khuong Quoc Vo , Phuong Hoang Tran","doi":"10.1016/j.synthmet.2024.117663","DOIUrl":"10.1016/j.synthmet.2024.117663","url":null,"abstract":"<div><p>In this study, a three-step process for the synthesis of gold nanoparticles supported on amorphous carbon (Au-Ac) using readily available chemicals has been developed. The characterization and properties of the resulting Au-AC catalyst were investigated using advanced analytical techniques, including FT-IR, Raman spectroscopy, X-ray diffraction (XRD), thermal gravimetric analysis (TGA), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), and energy-dispersive X-ray spectroscopy (EDX). This is the first time the Au-AC has been applied as a catalyst in the synthesis of 2-arylbenzo[<em>d</em>]oxazoles/2-arylbenzo[<em>d</em>]thiazoles/1-benzyl-2-arylbenzo[<em>d</em>]imidazoles from 2-aminophenol/2-aminothiophenol/2-aminoaniline and aldehydes. The catalyst facilitates the process of cyclization and oxidation through the Au active sites. The successful synthesis of derivatives of 2-phenylbenzo[<em>d</em>]oxazole, 2-phenylbenzo[<em>d</em>]thiazole and 1-benzyl-2-arylbenzo[<em>d</em>]imidazoles was achieved by employing optimal reaction conditions, which included the use of a 30 mg Au-AC catalyst and 100 mg of [Emim]Cl at 110 °C for 24 h.</p></div>","PeriodicalId":22245,"journal":{"name":"Synthetic Metals","volume":"307 ","pages":"Article 117663"},"PeriodicalIF":4.4,"publicationDate":"2024-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141279898","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}
Synthetic MetalsPub Date : 2024-06-01DOI: 10.1016/j.synthmet.2024.117660
Louise Dauga , Guillaume Haddad , Dominique Foix , Delphine Flahaut , Diane Delbègue , Yannick Borthomieu , Bernard Simon , Marc Dubois , Katia Guérin
{"title":"Enhanced lithium battery cathode performance via mechanical grinding of CFx_MnO2 hybrid materials for space-grade applications: Unveiling synergistic effects","authors":"Louise Dauga , Guillaume Haddad , Dominique Foix , Delphine Flahaut , Diane Delbègue , Yannick Borthomieu , Bernard Simon , Marc Dubois , Katia Guérin","doi":"10.1016/j.synthmet.2024.117660","DOIUrl":"10.1016/j.synthmet.2024.117660","url":null,"abstract":"<div><p>CFx_MnO<sub>2</sub> hybrid cathode materials are prepared from a (C<sub>2</sub>F)n-type graphite fluoride (CFx) and industrial MnO<sub>2</sub>. Because of its physicochemical (insulating behavior, low content of CF<sub>2</sub> and CF<sub>3</sub> groups, no or a few remaining sp<sup>2</sup> carbon atoms) and electrochemical properties (flat plateau on galvanostatic curve and theoretical capacity of 623 mAh/g, higher than other conventional cathodes for primary lithium battery), graphite fluoride of (C<sub>2</sub>F)n-type is selected to evidence synergetic effects with MnO<sub>2</sub> that occur at the fluoride/oxide and electrolyte/ electrode interfaces. Both materials are mixed by mechanical ball-milling using different sets of parameters. The hybrid material presents very good electrochemical properties with a maximum energy density of about 1600 Wh per kg of active material. Notably, it shows a considerable improvement in voltage plateau and voltage delay compared to CFx. The parameters applied during ball-milling also shape the electrochemical performance of the new hybrid material. Ball milling increases the average discharge voltage plateau, and the power density of the battery, and avoids ohmic drop which may cause a battery to be eliminated as soon as it begins to discharge. More finely, electrochemical impedance spectroscopy shows that pushed grinding leads to more homogeneous but more polarized material-electrolyte interfaces so better diffusion and capacity but lower discharge potential.</p></div>","PeriodicalId":22245,"journal":{"name":"Synthetic Metals","volume":"307 ","pages":"Article 117660"},"PeriodicalIF":4.4,"publicationDate":"2024-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141274500","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}
Synthetic MetalsPub Date : 2024-06-01DOI: 10.1016/j.synthmet.2024.117662
Alejandro E. Pérez Mendoza, Corina Andronescu, André Olean-Oliveira
{"title":"Design of conducting polymer/metal-based nanocomposites as electrocatalysts for electrochemical energy conversion","authors":"Alejandro E. Pérez Mendoza, Corina Andronescu, André Olean-Oliveira","doi":"10.1016/j.synthmet.2024.117662","DOIUrl":"10.1016/j.synthmet.2024.117662","url":null,"abstract":"<div><p>Conducting polymers (CPs) hold significant promise in the development of electrocatalysts due to their tailored conductivity and distinctive electronic properties. In recent years, there has been considerable attention towards metal nanoparticles/CPs nanocomposites as potential electrocatalysts. These composites have demonstrated the ability of CPs to enhance the electrocatalytic activity of metal nanoparticles by providing higher electrical conductivity, controlled structure, and increased surface area for the electrocatalysts. Moreover, CPs can exhibit active sites or modulate the activity of metal nanoparticles through interactions facilitated by their functional groups. This review offers a perspective on the potential use of well-designed CPs in creating high-performance electrocatalyst-based nanocomposites for applications in energy conversion. We specifically highlight previously reported CP-based electrocatalysts used in oxygen evolution (OER) and reduction (ORR), hydrogen evolution (HER), CO<sub>2</sub> electroreduction (CO<sub>2</sub>RR), and alcohol oxidation (AOR) reactions. We underscore both the merits and challenges associated with this type of material.</p></div>","PeriodicalId":22245,"journal":{"name":"Synthetic Metals","volume":"307 ","pages":"Article 117662"},"PeriodicalIF":4.4,"publicationDate":"2024-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0379677924001243/pdfft?md5=e10eb7dcfba50513aac3f4149e8ae177&pid=1-s2.0-S0379677924001243-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141277152","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Synthetic MetalsPub Date : 2024-05-31DOI: 10.1016/j.synthmet.2024.117656
Yi Cao , Mohamed Amine Khadimallah , Mohd Ahmed , Hamid Assilzadeh
{"title":"Enhancing structural analysis and electromagnetic shielding in carbon foam composites with applications in concrete integrating XGBoost machine learning, carbon nanotubes, and montmorillonite","authors":"Yi Cao , Mohamed Amine Khadimallah , Mohd Ahmed , Hamid Assilzadeh","doi":"10.1016/j.synthmet.2024.117656","DOIUrl":"https://doi.org/10.1016/j.synthmet.2024.117656","url":null,"abstract":"<div><p>Electromagnetic shielding in carbon foam composites involves using the natural conductivity of carbon foam to block or absorb electromagnetic fields. These composites protect sensitive electronic devices from electromagnetic interference (EMI), which can disrupt or damage their operation. The inclusion of XGBoost machine learning analyzes and optimizes the material compositions for electromagnetic interference shielding. By integrating Carbon Nanotubes (CNTs) and Montmorillonite (MMT) into samples of carbon foam, this research aims to identify the electromagnetic shielding effectiveness (SE), electrical conductivity, and dielectric permittivity at different frequencies of carbon foam composites. This analysis will facilitate the development of enhanced composite materials tailored for effective EMI shielding in concrete environments, particularly in structures housing sensitive electronic equipment. The novelty of this study lies in the dual integration of carbon nanotubes and montmorillonite into carbon foam composites, uniquely exploring their synergistic effects on both mechanical and electrical properties. The study employs XGBoost machine learning to optimize the material compositions for enhanced electromagnetic interference shielding. This study probes the dual integration of CNTs and montmorillonite into carbon foam composites, evaluating their synergistic impact on mechanical and electromagnetic properties. Incorporating 1 %, 3 %, and 5 % of these additives into carbon foams, substantial improvements were recorded in compressive, tensile, and flexural strengths, peaking with a 5 % MMT enhancement that nearly doubled the compressive strength from 3.96 MPa to 9.44 MPa. Concurrently, these composites displayed enhanced EMI SE, with detailed electrical characterizations at varying frequencies. Employing XGBoost machine learning, optimal material compositions were derived for EMI shielding, presenting advancements for industrial applications requiring robust structural and electrical performance.</p></div>","PeriodicalId":22245,"journal":{"name":"Synthetic Metals","volume":"307 ","pages":"Article 117656"},"PeriodicalIF":4.4,"publicationDate":"2024-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141308034","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}