Ceramics International最新文献

{"title":"Influence of Bi2O3 and Y2O3 co-doping on the structural and nuclear shielding properties of multi-elemental based glass-ceramics","authors":"Norah Salem Alsaiari ,&nbsp;Usman Iliyasu ,&nbsp;Erhan Ibrahimoglu ,&nbsp;M.S. Al-Buriahi","doi":"10.1016/j.ceramint.2025.01.574","DOIUrl":"10.1016/j.ceramint.2025.01.574","url":null,"abstract":"<div><div>This study explores the effects of co-doping Bi₂O₃ and Y₂O₃ (Bi-Y) on B₂O₃ -ZrO₂ -Na₂O –K₂O -SiO₂ -Al₂O₃ -ZnO -CaO glass-ceramics, produced via melting and powder metallurgy, for potential photon and neutron shielding applications. The Energy-Dispersive X-ray Spectroscopy (EDS) and Scanning Electron Microscopy (SEM) results showed that the undoped system had density of 2.68 g/cm³ and good homogeneity, while at 20 wt% Bi-Y, porosities and partial inhomogeneity appeared, with density increasing to 3.12 g/cm³. The Vickers hardness values increased from 6.27 Gpa to 12.42 GPa under a 0.5 kg load, and fracture toughness values (measured via the Palmqvist model) improved by 33 % with 20 wt% Bi-Y co-doping. The radiation shielding properties shows enhancement in mass and linear attenuation coefficient from 10.5226 to 20.7356 cm²/g and from 28.2006 to 64.6951 cm⁻¹, while the Mean Free Path (MFP) decrease from 0.0355 to 0.0155 cm for the undoped and co-doped with 20 wt% Bi-Y, at 0.015 MeV, indicating a clear compositional dependence. The effective neutron removal cross-sections of 20 wt% Bi-Y doped sample were 0.0939 cm⁻¹ greater than those of some common neutron shielding materials, indicating the potential for dual application in both photon and neutron shielding.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"51 13","pages":"Pages 17993-18002"},"PeriodicalIF":5.1,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143923198","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":"Melt-blending synthesis of v-GO/PCS precursor for deriving thermostable and microwave-absorbing rGO/SiC fibers","authors":"Tao Liu,&nbsp;Cheng Han,&nbsp;Xiaohan Wu,&nbsp;Yongjun Wang,&nbsp;Yucheng Ou,&nbsp;Songhe Zhang,&nbsp;Quzhi Song,&nbsp;Xiaoshan Zhang,&nbsp;Shanshan Wang,&nbsp;Yingde Wang","doi":"10.1016/j.ceramint.2025.01.488","DOIUrl":"10.1016/j.ceramint.2025.01.488","url":null,"abstract":"<div><div>Silicon carbide (SiC) fiber is considered an excellent reinforcement for high-temperature microwave-absorbing composites. Embedding graphene (Gr) to SiC monolithic ceramics has been proven to be a notable enhancement in both mechanical and microwave-absorbing properties. However, achieving homogeneous dispersion of Gr within SiC fibers remains a formidable challenge. Herein, we proposed a melt blending strategy without solution to prepare homogeneous-dispersed vinyl-bridged graphene oxide/polycarbosilane (v-GO/PCS) precursor. Subsequently, rGO/SiC fibers were fabricated using the polymer-derived ceramic (PDC) method. The distinctively wrinkled structure of rGO interlocks with the SiC fiber matrix, reinforcing the pulling-out and bridging mechanisms during the fiber fracture process, leading to a 36 % increase in the tensile strength of the 0.1%-rGO/SiC (as-received) fibers compared to the 0%-rGO/SiC (as-received) fibers. Moreover, rGO effectively stabilizes the amorphous SiC_<em>x</em>O_<em>y</em> and inhibits the rapid growth of SiC grains under high temperatures, resulting in a notable strength retention rate of 64 % for 0.1%-rGO/SiC fibers after 1600^oC-treatment. The reflection loss (RL) value of as-received 0.1%-rGO/SiC fibers reaches a minimum of −42.6 dB at 11.9 GHz, with an effective absorption bandwidth of 2.2 GHz (10.2–12.4 GHz). The results indicate that the melt blending strategy for uniformly embedding rGO into SiC fiber effectively achieves synergistic improvement of thermal stability and microwave-absorbing properties.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"51 13","pages":"Pages 17138-17147"},"PeriodicalIF":5.1,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143922767","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":"Investigations on the augmented physical, thermal and optical properties of tellurite glasses containing WO3 and TiO2","authors":"Nomula Chanakya ,&nbsp;J. Hema Madhuri ,&nbsp;Kiran Kumar Katta ,&nbsp;G. Upender ,&nbsp;Ch. Sameera Devi","doi":"10.1016/j.ceramint.2025.01.508","DOIUrl":"10.1016/j.ceramint.2025.01.508","url":null,"abstract":"<div><div>Novel tellurite glasses with compositional dependence of (90-x)TeO₂-10TiO₂-xWO₃ (0 ≤ x ≤ 30) were synthesized at 900 °C through melt quenching. XRD, EDX, FE-SEM, Color mappings, XPS, FTIR, Raman, DSC, optical absorption techniques were employed for characterizing the prepared samples. XRD, DSC and FE-SEM measurements testified the amorphous nature of the glasses. The Raman and FTIR analyses manifest the presence of TeO₃, TeO₃₊₁, TeO₄, WO₄, WO₆ structural units alongside the non-bridging oxygen's (NBO's) with increasing WO₃ content. The DSC studies showed that the addition of WO₃ content for TeO₂ reduced the crystallization by retaining the amorphous nature of these glasses which is a key for drawing optical fibers. Te-O-W/Ti-O-W/W-O-W linkages are observed to be accountable for increasing in glass transition temperature (T_g) of these glasses. On increasing WO₃ content, the crystal peaks shifted to higher temperature region which increased ΔT. The calculated optical band gap (E_opt) of the glasses suggests that the width of the valence and conduction bands increases by reducing the optical band gap energy. The Urbach energy (ΔE) values are observed to be increased and demonstrated that the glasses with higher mol% of WO₃ are having more structural disorder defects. The electron donating ability of O²⁻ ions in Te-O/W-O/Ti-O increases with increasing WO₃. The variations in α_O²⁻ and A_th clearly manifest that the degree of covalent bonds increases in the glass matrix with WO₃ content. The FTIR, Raman, DSC and Optical absorption analyses confirmed that these glasses possess higher refractive index, larger thermal stability and lowering the phonon energy due to the addition of WO₃ content. Thus, it is believed that these glasses might useful for making the optical lenses and promising material for fiber drawing applications.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"51 13","pages":"Pages 17355-17367"},"PeriodicalIF":5.1,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143922911","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":"3D porous CoNi@Ti3C2Tx@rGO aerogel exhibiting superior electromagnetic wave absorption performance","authors":"Shuang Zhang ,&nbsp;Na Zhao ,&nbsp;Fan Zhang ,&nbsp;Rui Zhang ,&nbsp;Hailong Wang ,&nbsp;Bingbing Fan","doi":"10.1016/j.ceramint.2025.01.479","DOIUrl":"10.1016/j.ceramint.2025.01.479","url":null,"abstract":"<div><div>A new type of two-dimensional Ti₃C₂T_<em>x</em> MXene material has attracted wide attention due to its unique layered structure, large specific surface area, and metallic properties. However, the microwave absorption (MA) performance is limited due to its high conductivity. To address this, a CoNi@ Ti₃C₂T_<em>x</em>@rGO aerogel composite was prepared by hydrothermal reaction and heat treatment. The MA properties of this composite can be effectively tuned by adjusting the mass ratio of CoNi@ Ti₃C₂T_<em>x</em> to GO. The results show that excellent MA performance is achieved at a low filling ratio (3 wt%). When the mass ratio of CoNi@Ti₃C₂T_<em>x</em> to GO is 1: 1, a minimum reflection loss of −66.36 dB at 7.2 GHz is observed with a thickness of 2.1 mm. Furthermore, by adjusting the thickness, the maximum effective absorption bandwidth can reach 6 GHz (11.5–17.5 GHz) with a thickness of only 1.4 mm. The composite's multiple components optimize impedance matching and enhance interfacial polarization loss, while the aerogel's structure promotes multiple reflections and scattering. This approach offers new insights into designing high-efficiency microwave absorption materials.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"51 13","pages":"Pages 17015-17024"},"PeriodicalIF":5.1,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143922991","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":"Exploring the structural and optical modifications induced by Ru doping in Ba0.5Sr0.5RuxFe12-xO19 M-type hexaferrites to enhanced microwave absorption","authors":"Varsha C. Pujari ,&nbsp;Pramod D. Mhase ,&nbsp;Sunil M. Patange ,&nbsp;Shoyebmohamad F. Shaikh ,&nbsp;Vijaykumar V. Jadhav ,&nbsp;Santosh S. Jadhav","doi":"10.1016/j.ceramint.2025.01.480","DOIUrl":"10.1016/j.ceramint.2025.01.480","url":null,"abstract":"<div><div>This study reports the effects of Ru doping on the structure, optical and microwave absorption (MWA) properties of M-type hexaferrites (MHF) for potential applications in electromagnetic interference (EMI) shielding and stealth technology. The Ba_0.5Sr_0.5Ru_xFe_12-xO₁₉ (x = 0.00,0.05,0.10,0.15 and 0.20) materials were synthesized using a sol–gel auto-combustion method, and their structural and morphological characteristics were analyzed using XRD, FESEM, and EDAX. The Rietveld refining method confirmed the stability of a hexaferrite structure belonging to the P6₃/mmc space group. The FESEM analysis of prepared hexaferrite materials revealed well-organized structures with particle sizes ranging from 0.63 μm to 5.12 μm. EDAX confirmed the presence of Ba, Sr, Ru, Fe, and O, indicating the purity of the synthesized MHF. PL spectroscopy showed that increasing the doping of Ru decreased PL intensity due to non-radiative recombination. Ru³⁺ doping gives rise to a prominent emission peak at 578 nm, an increase in the band gap energy from 2.58 eV to 2.83 eV and improved microwave absorption properties, with a minimum reflection loss (RL) of −34.4 dB at 10.08 GHz for x = 0.15. The work demonstrates the synergistic role of Ru³⁺ substitution in enhancing dielectric properties, magnetic loss mechanisms, and impedance matching, making these materials ideal candidates for tailored electromagnetic wave absorption in the 8–12 GHz frequency range. The material thickness plays a crucial role, with thinner samples exhibiting better microwave absorption at higher frequencies and thicker samples performing more effectively at lower frequencies, making prepared MHFs suitable for electromagnetic interference (EMI) shielding.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"51 13","pages":"Pages 17025-17039"},"PeriodicalIF":5.1,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143922992","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":"Preparation of porous silicon nitride as supporting skeletons to phase change material with improved anti-leakage and heat conduction performance","authors":"Nan Sheng ,&nbsp;Yunfei Li ,&nbsp;Rui Chen ,&nbsp;Min Deng ,&nbsp;Chunyu Zhu","doi":"10.1016/j.ceramint.2025.01.513","DOIUrl":"10.1016/j.ceramint.2025.01.513","url":null,"abstract":"<div><div>The employment of thermally conductive porous ceramic skeletons to adsorb the organic phase change materials (PCMs) is an effective method to address the problems of their low thermal conductivity and easy leakage. In this study, Si powders are used to form porous frameworks through the ice-templated shaping, and are subsequently transformed to Si₃N₄ skeletons by the direct nitridation reaction. Phase change composites (PCCs) were prepared by filling the porous skeletons with paraffin wax (PW) by vacuum impregnation. The layer directional structure of the ceramic skeletons constructs a continuous thermal conductive path, significantly enhancing the thermal conductivity of PCCs. The results demonstrate that when the proportion of Si₃N₄ skeleton reaches 53.3 wt%, the thermal conductivity of PCC in the axial direction was as high as 2.99 W m⁻¹ K⁻¹, which is 14.95 times that of PW. The PCC could maintain an enthalpy of 85.8 J g⁻¹ and a good cycling stability. Additionally, the porous Si₃N₄ skeletons also enable the composites with good shape-stability to avoid the leakage of PW. The enhancement of heat transfer and anti-leakage performance ensures the PCCs in this study with broad application prospects in the fields of heat storage and thermal management.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"51 13","pages":"Pages 17407-17414"},"PeriodicalIF":5.1,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143922999","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":"Fabrication and characterization of (Ti,W)C-HEA cermets based on the CoCrFeNiTi high entropy alloy","authors":"Liangcai Du ,&nbsp;Qianqian Kong ,&nbsp;Lichao Gong ,&nbsp;Huachen Liu ,&nbsp;Song Huang ,&nbsp;Yunqi Xie ,&nbsp;Zhenhua Yao","doi":"10.1016/j.ceramint.2025.01.554","DOIUrl":"10.1016/j.ceramint.2025.01.554","url":null,"abstract":"<div><div>High entropy alloys (HEAs) exhibit distinctive core effects and excellent properties, presenting promising prospects for various applications, particularly as potential cermet adhesives. (Ti,W)C-HEA cermets were synthesized using vacuum sintering, employing mechanically alloyed CoCrFeNiTi HEA powder as a binder. The microstructure and mechanical properties of the produced cermets were systematically analyzed, with a particular focus on the effect of the HEA binder on the mechanical properties of the cermets. The findings indicated a decreasing trend in relative density, Rockwell hardness, and transverse rupture strength (TRS) of the cermets. Notably, the CM1 group ((Ti,W)C-30 wt% Co₂₀Cr₂₀Fe₂₀Ni₃₅Ti₅) demonstrated the most favorable overall properties, with values of 97.0 % for relative density, 83.2 HRA for Rockwell hardness, and 776.6 MPa for TRS. The phase transformation of HEAs at elevated temperatures was meticulously investigated using differential scanning calorimetry (DSC) and heat treatment. Combined with X-ray diffraction (XRD), the phase transformation of Co₂₀Cr₂₀Fe₂₀Ni₂₅Ti₁₅ and Co₂₀Cr₂₀Fe₂₀Ni₁₅Ti₂₅, heat treated at increasing temperatures, is as follows: FCC + BCC (milled) → FCC + σ (700°C–1100 °C) → FCC (bulk).</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"51 13","pages":"Pages 17837-17849"},"PeriodicalIF":5.1,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143921630","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":"Integrated cold sintering of ceramic circuit substrate for power device packaging","authors":"Zhenyu Lei ,&nbsp;Yongjie Ding ,&nbsp;Xianxing Ju ,&nbsp;Qin Wang ,&nbsp;Yang Peng ,&nbsp;Mingxiang Chen","doi":"10.1016/j.ceramint.2025.01.557","DOIUrl":"10.1016/j.ceramint.2025.01.557","url":null,"abstract":"<div><div>The Al₂O₃ ceramic substrate exhibits significant potential in advanced packaging due to its superior comprehensive properties but is hindered by complex technology (separate processing of ceramic sheets and circuits), stringent processing conditions (&gt;1000 °C), and high thermal expansion coefficient, thus limiting its application in high heat dissipation devices. The cold sintering process (CSP), an advanced method for processing ceramic sheets, offers notable advantages in technology, costing, and flexibility, but still encounters restrictions regarding the thermal properties of the ceramic sheet, and the feasibility of concurrently preparing the ceramic sheets and circuits remains unexamined. Therefore, a straightforward and economical method for creating integrated ceramic circuit substrates based on CSP was proposed herein. The Al₂O₃ ceramic sheets and circuit layer metal were directly combined by molding copper foil and Al₂O₃ slurry together under a pressure of 300 MPa, the circuits were subsequently refined through pattern etching to create the Al₂O₃ CSP ceramic substrate, and the performance of the novel substrate in white light-emitting diode (WLED) packaging was validated. The exceptional CSP method significantly enhances the preparation efficiency and overall performance of the Al₂O₃ ceramic substrate. The Al₂O₃ CSP ceramic sheets exhibit minimal mass loss of 1.47 %, a high densification of 3.0263 g/cm³, a low thermal expansion coefficient of 1.286 × 10⁻⁵/°C, and superb bonding strength with copper foil (12.0 MPa). The Al₂O₃ CSP ceramic substrate ensures stable optical and thermal performance of the WLED, demonstrating its potential as a strategy for power device packaging and broadening the fabrication methods and application scope of the ceramic substrate.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"51 13","pages":"Pages 17870-17878"},"PeriodicalIF":5.1,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143921633","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":"Mechanical properties and aging resistance of calcia-yttria co-stabilized zirconia: from powder to ceramic","authors":"Ya-Nan Feng ,&nbsp;Fei-Fan Wang ,&nbsp;Weiwei Xiao ,&nbsp;Yan Xia ,&nbsp;Bin Wei ,&nbsp;Shuaihua Wang ,&nbsp;Zhonghua Deng ,&nbsp;Fei-Fei Chen ,&nbsp;Lingyun Li ,&nbsp;Yan Yu","doi":"10.1016/j.ceramint.2025.01.509","DOIUrl":"10.1016/j.ceramint.2025.01.509","url":null,"abstract":"<div><div>In this study, divalent calcium cation with large radius and trivalent yttrium cation with small radius were introduced to develop co-stabilized zirconia ceramics with both superior mechanical properties and aging resistance. Through a reverse coprecipitation-hydrothermal method, a series of ultrafine <em>x</em>CaO-<em>y</em>Y₂O₃-ZrO₂ (<em>x = 2.0, 3.0, y = 0.5, 1.0, 1.5, 2.0</em>) raw powders with high quality were fabricated for the production of nanostructured ceramics via low-temperature pressurelessly sintering. The sintering process was optimized by investigating the effects of sintering temperature on densification, grain growth and phase evolution. The minimally doped <em>2.0</em>CaO-<em>0.5</em>Y₂O₃-ZrO₂ ceramic retained pure tetragonal phase at room temperature, achieving a balance of excellent toughness and high aging resistance. The impacts of chemical composition on microstructure, hardness, toughness and aging resistance were examined for these <em>x</em>CaO-<em>y</em>Y₂O₃-ZrO₂ (<em>x = 2.0, 3.0, y = 0.5, 1.0, 1.5, 2.0</em>) ceramics. The segregation of calcium and yttrium cations at grain boundaries effectively tailored the microstructure. It was observed that substituting small trivalent yttrium cations for large divalent calcium cations effectively enhanced the aging resistance without sacrificing mechanical properties, due to the strengthened grain boundaries and asymmetrical distribution of cations among grains. This work not only produces low-doped zirconia ceramics with both excellent mechanical properties and aging resistance, but also presents straightforward method for preparation of high-quality raw powders and delicate microstructural engineering during sintering for developing advanced structural ceramics.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"51 13","pages":"Pages 17368-17378"},"PeriodicalIF":5.1,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143922996","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":"Tailoring optical and electrical properties of hybrid polymer nanodielectrics: Synthesis and characterization of CuO/TiO2 nanoparticle-embedded HPMC/NaAlg blend","authors":"H.M. Ragab ,&nbsp;N.S. Diab ,&nbsp;Azza M. Khaled ,&nbsp;Shimaa Mohammed Aboelnaga ,&nbsp;Ammar Qasem ,&nbsp;M.O. Farea ,&nbsp;M.A. Morsi","doi":"10.1016/j.ceramint.2025.01.503","DOIUrl":"10.1016/j.ceramint.2025.01.503","url":null,"abstract":"<div><div>Polymer nanodielectrics composed of nanoceramic fillers exhibit adjustable optical and electrical properties that make them suitable for advanced optoelectronic and organoelectronic devices. This study synthesized copper oxide and titanium dioxide nanoparticles (CuO/TiO₂ NPs) using a sonochemical method. These nanoparticles were incorporated into a hybrid polymer matrix of hydroxypropyl methylcellulose and sodium alginate (HPMC/NaAlg) at concentrations of 3.0, 5.0, 7.0, and 9.0 wt% through solution casting. X-ray diffraction (XRD) and Fourier-transform infrared (FTIR) spectra revealed the induced increment for the amorphous structure of the HPMC/NaAlg blend and the formation of intermolecular interactions between the host polymer and the added hybrid NPs. Optical properties, including the optical bandgap and other optical constants, were examined using UV/vis spectrophotometry, where the direct and indirect bandgaps reduced from 4.51 eV (for pure blend) to 3.28 eV (9.0 wt% nanocomposite film) and 3.37 to 2.29 eV, respectively. The AC electrical conductivity and dielectric complex permittivity were explored over the frequency (<em>f</em>) range of 0.1 Hz–10 MHz. At <em>f</em> = 10 Hz, the dielectric constant increased significantly from 12 to 270, and AC conductivity enhanced from 1.68 × 10⁻¹² S/m to 1.55 × 10⁻¹⁰ S/m with the addition of 9.0 wt% CuO/TiO₂ NPs. These results suggest that the prepared HPMC/NaAlg-CuO/TiO₂ films are promising for various applications such as UV-blockers, optical bandgap tuning, optical coatings, and high-permittivity controllable substrates for futuristic energy storage devices.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"51 13","pages":"Pages 17302-17310"},"PeriodicalIF":5.1,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143923188","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}