Ceramics International最新文献

{"title":"Effects of Cr3+ incorporation on structure, surface morphology, and the magnetocaloric effect in La0.8Sr0.2Mn1-xCrxO3 ceramics by means of first-principles calculations and wet chemical method","authors":"Zhuojia Xie ,&nbsp;Xiuxin Zheng ,&nbsp;Wenbin He ,&nbsp;Min Feng ,&nbsp;Changji Xu ,&nbsp;Zhengguang Zou","doi":"10.1016/j.ceramint.2024.12.434","DOIUrl":"10.1016/j.ceramint.2024.12.434","url":null,"abstract":"<div><div>The investigation focused on the impact of Cr³⁺ incorporation on structural features, surface morphology, and the magnetocaloric effect in La_0.8Sr_0.2Mn_1-<em>x</em>Cr_<em>x</em>O₃ ceramics, with <em>x</em> values of 0.05, 0.10, and 0.15, employing both experimental methods and theoretical simulations. Synthesis of La_0.8Sr_0.2Mn_1-<em>x</em>Cr_<em>x</em>O₃ ceramics was achieved using the sol-gel method. Analyses via transmission electron microscopy and X-ray diffraction confirmed that La_0.8Sr_0.2Mn_1-<em>x</em>Cr_<em>x</em>O₃ ceramics possess a rhombohedral crystal structure, corresponding to space group No.167 (R-3c). Scanning electron microscopy revealed that La_0.8Sr_0.2Mn_1-<em>x</em>Cr_<em>x</em>O₃ ceramics comprise irregular ellipsoidal particles. The average particle size ranged from 173 nm to 226 nm. XPS confirmed the presence of all elements in La_0.8Sr_0.2Mn_1-<em>x</em>Cr_<em>x</em>O₃ ceramics. Mixed valence states of Mn (Mn³⁺/Mn⁴⁺) and Cr (Cr³⁺/Cr⁴⁺) were identified, with Sr at +2 and La at +3. The Tc of La_0.8Sr_0.2Mn_1-<em>x</em>Cr_<em>x</em>O₃ ceramics (<em>x</em> = 0.05, 0.10, 0.15) were determined using a Magnetic Property Measurement System to be 301 K, 278 K, and 253 K, respectively. A decrease in Tc with increasing Cr³⁺ doping was observed. Analysis of isothermal magnetization and Arrott plots reveals that La_0.8Sr_0.2Mn_1-<em>x</em>Cr_<em>x</em>O₃ ceramics undergoes a second-order transition from paramagnetism to ferromagnetism. It was found that the net magnetic moment (The vector sum of all magnetic moments) and magnetic entropy change of La_0.8Sr_0.2Mn_1-<em>x</em>Cr_<em>x</em>O₃ ceramics decreased with increasing of Cr³⁺ doping. For samples with a chromium doping level of <em>x</em> = 0.05, the Tc is recorded at 301 K. At this doping concentration, the peak magnetic entropy change is observed to be 3.50 J/(kg K) (H = 5 T).</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"51 8","pages":"Pages 10026-10040"},"PeriodicalIF":5.1,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143593634","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Advanced n-V₂O₅/p-Si photodetector for high-efficiency visible and infrared detection","authors":"Divyanshu Vyas ,&nbsp;Shobharajsinh Rathod ,&nbsp;Rahul Patel ,&nbsp;C.K. Sumesh ,&nbsp;Kamlesh Chauhan ,&nbsp;Sanni Kapatel","doi":"10.1016/j.ceramint.2024.12.440","DOIUrl":"10.1016/j.ceramint.2024.12.440","url":null,"abstract":"<div><div>In this study, the potential of Vanadium pentoxide (V₂O₅), a candidate from Transition metal oxide family, has been harnessed for devising Photodetector through RF magnetron sputtering, for cutting-edge optoelecteonic applications. The thin film of n-type V₂O₅ was prepared on p-Si wafer substrare, operating within a high vacuum environment at <em>10</em>^{<em>−4</em>} <em>Pa</em>. It has been resulted in the X-ray diffraction analysis that highly crystalline orthorhombic crystal arrangement has formed with the crystallite size of <em>9.</em>26 nm. Encouragingly, it has been noted that the Raman analysis is also consistent with the X-ray analysis to provide structural information of the prepared film. Impressively, the prepared film has maintained a high optical transparency across the IR to Visible spectrum, also it has been deduced from the optical analysis marking the bandgap of <em>2.</em>45 eV. From the field emission scanning electron micrograph, it has been prosulated uniform formation of the film flake like structure. The analysis from energy dispersive spectroscopy suggested uniform stoichiometric arrangement of Vanadium and Oxygen through the film. X-ray photoelectron spectroscopy analysis enabled us to delve into the chemical composition and surface characteristics, shedding light on their electronic structure. Core to our investigation, we assessed the photodetection capabilities of these n-V₂O₅/p-Si device across different spectral ranges, including Blue, Infrared (IR), and Visible. We evaluated their photodetector performance through current-voltage (IV) characteristics under varying bias voltages, and wavelengths. These analyses unveiled remarkable responsivity of <em>6.</em>6 A/W, detectivity of <em>1.2 × 10</em>^<em>12</em> <em>Jones</em>, external quantum efficiency of <em>1498 %</em>, sensitivity of 2962 A/W, and rise time and fall time of 60 ms and 80 ms respectively for the visible LED, also underscoring the similar potential of device for blue and IR radiation, which complement the usage of V₂O₅ for optoelectronic applications.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"51 8","pages":"Pages 10095-10102"},"PeriodicalIF":5.1,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143593701","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Microstructure evolution of Ti3C2 / TiO2 quasi-dynamic heterostructures with high SERS sensitivity","authors":"Renjie Li ,&nbsp;Qiqi Chen ,&nbsp;Wenyan Shi ,&nbsp;Rui Da ,&nbsp;Jiajing Lin ,&nbsp;Zheng Li ,&nbsp;Zhuohong Feng ,&nbsp;Lin Lin ,&nbsp;Yang Ren ,&nbsp;Guilin Chen ,&nbsp;Zhezhe Wang","doi":"10.1016/j.ceramint.2024.12.419","DOIUrl":"10.1016/j.ceramint.2024.12.419","url":null,"abstract":"<div><div>A typical 2D MXenes of Ti₃C₂ were deposited on TiO₂ by thermal spraying. The formed heterostructures show excellent SERS sensitivity and reproductivity comparable to noble metals. The EF is estimated to be 5.09 ∗ 10⁹, and the LOD is calculated to be about 1.09∗10⁻¹³ M. The RSD of Rhodamine 6G (R6G) detected is about 3.13 %. The UV–vis spectra and PLE spectra demonstrates the local interface charge transfer (CT) in the Ti₃C₂/TiO₂ heterostructures. Furthermore, the 3D FDTD simulation was employed to simulate the spatial distribution of the electric field, which reveal that the charge transfer caused by the interface effects in 2D Ti₃C₂/TiO₂ structures play predominant role for improving the SERS performance via enhancing the electromagnetic field intensity. While, when the thickness of multi-layer Ti₃C₂ increases, local interface effect disappears, and the Raman enhancement mainly depend on the excellent metal conductivity of Ti₃C₂. The dynamic microstructure evolution of Ti₃C₂ into TiO₂ was surveyed by the SERS spectra and the results indicates that the decomposition of Ti₃C₂ is a first-order chemical reaction.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"51 8","pages":"Pages 9877-9883"},"PeriodicalIF":5.1,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143593742","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Cost-effective, facile, and scalable synthesis of alumina ceramic nanowires through strain-induced conversion of Al-Li bimetallic alloys","authors":"Wenqiang Hu ,&nbsp;Haozheng Han ,&nbsp;Qianwen Sun ,&nbsp;Xuanzhi Xiao ,&nbsp;Huiting Hu ,&nbsp;Zhenying Huang ,&nbsp;Yang Zhou","doi":"10.1016/j.ceramint.2024.12.408","DOIUrl":"10.1016/j.ceramint.2024.12.408","url":null,"abstract":"<div><div>One-dimensional (1D) Al₂O₃ materials with high aspect ratios are highly desirable because they promise to be functional and structural blocks for a new generation of nanocomposites due to their unique mechanical and chemical properties. Unfortunately, producing 1D Al₂O₃ microstructures at a large scale always suffers from costly or toxic chemicals and their complicated synthesis procedures. The present study proposed a straightforward strategy based on the strain-induced transformation of porous Al-Li bulk into 1-D nanowires (NWs), which enable scalable and low-cost producing batches of Al₂O₃ NWs. The balance between the minimization of strain energy of the reaction front and surface energy of in-situ formed NWs dominates the overall transformation process. We show that the surface activity of porous Al was significantly stimulated through the dissolution of Li⁺ ion as immersed the pristine Al-Li alloy in deionized water, and resulting Li-doped porous Al preform gradually evolved and transformed into Al ethoxide NWs in time of a dealloying reaction in ethanol. Such NWs can be eventually converted into pure Al₂O₃ NWs after subsequent annealing in air. We investigate the evolution process of NWs and the effect of Al−Li alloy composition, and thermal treatment temperature on the crystallographic structure and morphology of the obtained Al₂O₃ NWs. The newly developed Al₂O₃ nanowires obtained without using any co-catalyst, doping agents, or any other complexity of the procedure are expected to be of interest in industrial-scale applications.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"51 8","pages":"Pages 9772-9781"},"PeriodicalIF":5.1,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143593774","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of Cr on the oxidation resistance of in-situ TiC/Ni composites prepared by pressureless reactive sintering","authors":"Xiquan Zhang,&nbsp;Qian Qi,&nbsp;Yueyang Zhao,&nbsp;Yuanyang Zhu,&nbsp;Qixiao Yang","doi":"10.1016/j.ceramint.2024.12.414","DOIUrl":"10.1016/j.ceramint.2024.12.414","url":null,"abstract":"<div><div>The oxidation resistance of TiC/Ni composites plays one key role in the high temperature application areas. Cr could effectively improve the oxidation resistance of metal and alloys, and the effect of Cr on the oxidation behavior of in-situ TiC/Ni composites is investigated in this work. The composites with different Cr content (0, 5, 10 and 15 wt%) are prepared by reactive sintering, and the results show that Cr element dissolves in Ni matrix and exists in the form of Cr₇C₃ and Cr₂₃C₆ phase. The oxidation weight gain of composites decreases from 7.471 mg/cm² to 0.551 mg/cm², and the thickness of oxide scale decreases from 99.99 μm to 5.10 μm at 800 °C for 100 h by adding 15 wt% Cr. The double continuous layers including upper TiO₂ and beneath Cr₂O₃ is generated on composites. The Cr₂O₃ layer effectively inhibit the outward diffusion of Ti and Ni and inward diffusion of O ions, leading to the gradually disappearance of Ni oxides and inner oxide layer with the increase of Cr content. The critical value of Cr content in in-situ TiC/Ni composites to form continuous and dense Cr₂O₃ layer is about 10 wt%.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"51 8","pages":"Pages 9824-9832"},"PeriodicalIF":5.1,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143593778","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 thermally stable color-tunable white phosphor CaGa0.5Nb0.5O3: Dy3+/Sm3+ for warm WLEDs","authors":"Minghao Zhang ,&nbsp;Xiang Guo ,&nbsp;Ruirui Cui ,&nbsp;Jun Zhang ,&nbsp;Chaoyong Deng","doi":"10.1016/j.ceramint.2024.12.405","DOIUrl":"10.1016/j.ceramint.2024.12.405","url":null,"abstract":"<div><div>Rare-earth-doped double perovskite phosphors often exhibit excellent lumines-cent properties, high color rendering, and stability. However, there is little research on Dy³⁺-doped double perovskite white phosphors. Additionally, the white luminescence of Dy³⁺ ions has drawbacks such as high color temperature and low color ren-dering index. These drawbacks can often be improved by selecting appropriate co-doping ions such as Sm³⁺, which can be excited by ultraviolet and near-ultraviolet light to achieve good orange-red emission. Therefore, we synthesized a novel double perovskite phosphor CaGa₀.₅Nb₀.₅O₃ (CGNO): Dy³⁺/Sm³⁺ using the high-temperature solid-state method. The properties of the phosphors, such as crystal structure, elemental composition, absorption spectra, photoluminescence spectra, thermal stability, and CIE chromaticity coordinates, fluorescence lifetimes and quantum yield, were investigated in detail. It was found that the CGNO: 0.04Dy³⁺ phosphor and CGNO: 0.04Dy³⁺, 0.05Sm³⁺ phosphor were pure phase compounds with a particle size of about 5 μm. Under excitation at 351 nm or 363 nm, two prominent peaks of Dy³⁺ emerge around 481 nm and 575 nm, in that order. In this co-doped phosphor CGNO: 0.04Dy³⁺, 0.05Sm³⁺, the correlated color temperature (CCT) value decreases and the color purity increases with the concentration of Sm³⁺ ions increasing, and the tones of the white light emitted are gradually becoming mild and warm from a single cold. Fluorescence lifetime fitting indicates that energy transfer occurs between Dy³⁺ and Sm³⁺ through dipole-dipole interactions. The low chromaticity shift and low luminescence attenuation indicate that both phosphors have very stable luminescence and color performance at high temperatures, and using 365 nm InGaN chip excitation, the CGNO: 0.04Dy³⁺ phosphor and the CGNO: 0.04Dy³⁺, 0.05Sm³⁺ phosphor emit white light with CCT values of 3480 and 2893 K respectively, which have the potential to be applied to indoor lighting.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"51 8","pages":"Pages 9740-9752"},"PeriodicalIF":5.1,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143593847","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of carbon vacancy on phase formation and mechanical properties of high-entropy (Ti,Nb,Ta,Hf,W)Cx","authors":"Wei Liao ,&nbsp;Zhen Teng ,&nbsp;Yiwang Bao","doi":"10.1016/j.ceramint.2024.10.429","DOIUrl":"10.1016/j.ceramint.2024.10.429","url":null,"abstract":"<div><div>High-entropy (Ti_0.2Nb_0.2Ta_0.2Hf_0.2W_0.2)C_x with different carbon vacancies were prepared from raw binary carbides in this study. The influences of stoichiometry, particle size of raw powder, and sintering temperature on phase formation, microstructure, and mechanical properties of (Ti_0.2Nb_0.2Ta_0.2Hf_0.2W_0.2)C_x were systematically investigated. The results indicate that the introduction of carbon vacancies and using finer raw binary carbide powders can both significantly enhance the formation ability of single-phase composition with uniform elemental distributions. The formation of a high-entropy phase could enhance the Vicker's hardness. The flexural strength is greatly influenced by the content of carbon vacancy, which is greatly detrimental to flexural strength. The fracture toughness is determined by both the content of carbon vacancies and the presence of secondary phases. By optimizing the content of carbon vacancies, particle size of raw powders, and sintering temperature, (Ti_0.2Nb_0.2Ta_0.2Hf_0.2W_0.2)C shows super high flexural strength of 743 MPa and fracture toughness of 8.6 MPa m^−1/2.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"51 8","pages":"Pages 9579-9587"},"PeriodicalIF":5.1,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143593913","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"High-quality customized micro-diffractive optical devices fabricated from ZnS ceramics using femtosecond laser direct writing and solution etching","authors":"Hanchen Zhang ,&nbsp;Qisong Li ,&nbsp;Hongming Zheng ,&nbsp;Jincheng Jiang ,&nbsp;Wuqing Hong ,&nbsp;Long Zhang ,&nbsp;Yi Liu","doi":"10.1016/j.ceramint.2024.12.484","DOIUrl":"10.1016/j.ceramint.2024.12.484","url":null,"abstract":"<div><div>Zinc sulfide (ZnS) is one of the most widely used materials in infrared optics. ZnS-based micro-optical elements can transform a single infrared material into a functional micro-optical system, showing significant potential in the infrared field. In this study, we report, to the best of our knowledge, the first successful fabrication of surface-etched ZnS ceramic micro-optical devices with acceptable optical quality using femtosecond laser direct writing and subsequent solution etching. We investigated the widths and depths of the fabricated ZnS ceramic microstructures by varying laser energy, repetition frequency, and scanning speed. Based on these data and using the proposed technology, we prepared a series of micro-optical devices, including one- and two-dimensional gratings with various duty cycles, as well as square, circular, and Dammann gratings. Furthermore, the data on width and depth were used to design regulated micro-optical devices with different structural sizes. For example, we constructed a Fresnel zone plate with eight odd and eight even zones, each with different widths and radii. The results show that the fabrication error can be kept below 1 μm. Additionally, the diffraction and focusing results of the gratings demonstrated acceptable optical performance of these ZnS-based micro-optical devices at 632.8 nm and 3 μm, which shows the working ability at visible-infrared wavelengths. This study presents a novel approach for fabricating ZnS micro-optical devices, which could advance the development of infrared micro-optical elements.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"51 8","pages":"Pages 10521-10532"},"PeriodicalIF":5.1,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143594226","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Oxide-bonded silicon carbide and alumina ceramics obtained from template SCS powders","authors":"R.A. Shishkin","doi":"10.1016/j.ceramint.2024.12.467","DOIUrl":"10.1016/j.ceramint.2024.12.467","url":null,"abstract":"<div><div>This study explores the synthesis of SiC@Al₂O₃ and Al₂O₃@Al₂O₃ core-shell structured powders using a template-assisted solution combustion synthesis (SCS) method. Employing urea as the sole fuel resulted in well-dispersed aluminum oxide particles on the silicon carbide surface, while mixed fuels led to agglomeration. Subsequent processing using the template SCS method effectively minimized agglomeration and yielded predominantly the δ-Al₂O₃ phase. Despite not completely preventing silicon carbide oxidation, the core-shell structures significantly enhanced mullite bond formation, leading to reduced porosity and improved mechanical properties. The SCS method also lowered the mullite synthesis temperature to 1335 °C. Cold isostatic pressing further increased density and mechanical properties, resulting in microhardness of 5.2 GPa and bending strength of nearly 50 MPa. Template SCS emerges as a promising technique for producing high-density, high-performance ceramics and composite materials at lower temperatures.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"51 8","pages":"Pages 10340-10350"},"PeriodicalIF":5.1,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143594228","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Waterborne polyurethane composites with asymmetric multilayered electromagnetic gradient for absorption dominated electromagnetic interference shielding","authors":"Hao Sun ,&nbsp;Xudong Fang ,&nbsp;Chen Wu ,&nbsp;Ziyan Fang ,&nbsp;Qiang Kang ,&nbsp;Zhengcai Zhao ,&nbsp;Zhongkai Zhang ,&nbsp;Bian Tian ,&nbsp;Libo Zhao ,&nbsp;Maeda Ryutaro","doi":"10.1016/j.ceramint.2024.12.469","DOIUrl":"10.1016/j.ceramint.2024.12.469","url":null,"abstract":"<div><div>Absorption dominated electromagnetic interference (EMI) shielding composites have high EMI shielding effectiveness (SE) while eliminating electromagnetic (EM) radiation to the environment, making them vital for solving EM pollution problems. However, there is a lack of composite with both strong EM wave absorption and high EMI SE. Herein, we report an ingenious layer-by-layer (LBL) casting method to prepare waterborne polyurethane/iron oxide/carbon nanotube/reduced graphene oxide (WPU/Fe₃O₄/CNT/rGO, WFCR) EM wave absorber. A positive conductive gradient and a negative magnetic gradient are formed by controlling the composition, and EM wave absorption is enhanced by the asymmetric EM gradient structure. Subsequently, EM wave undergoes the process of \"absorption-reflection-reabsorption\" induced by the Ag reflection layer prepared by screen printing. Caused by the plentiful EM wave loss mechanism including magnetic loss, interface polarization and conductive loss in Ag-WFCR composites, EMI SE reaches 38.96 dB, and the absorption coefficient (<em>A</em>) value is 0.68, which intuitively demonstrates that the EMI shielding mechanism is dominated by absorption. In addition, the high tensile strength of 9.25 MPa and the compressive strength of 556.2 kPa also indicates its good mechanical properties. These excellent performances demonstrate the promising application of Ag-WFCR composites in EMI shielding and thermal management applications as well as in wearable electronics.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"51 8","pages":"Pages 10365-10374"},"PeriodicalIF":5.1,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143594230","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}