Materials Chemistry and Physics最新文献

{"title":"Preparation of Fe@C nanoparticles via hydrogen-oxygen explosion","authors":"Yi Liu ,&nbsp;Tiejun Zhao ,&nbsp;Honghao Yan ,&nbsp;Zhongyu Yang ,&nbsp;Wenfeng Du ,&nbsp;Linjie Tian","doi":"10.1016/j.matchemphys.2024.130141","DOIUrl":"10.1016/j.matchemphys.2024.130141","url":null,"abstract":"<div><div>In order to study the growth process of Fe@C nanoparticles prepared by gas explosion method, experiments and numerical simulations of hydrogen-oxygen explosion were carried out. The influence of hydrogen concentration on the propagation of explosion wave, the variation of detonation parameters and the growth of Fe@C nanoparticles were analyzed. The results show that the hydrogen-oxygen explosion in a closed tube includes the propagation stage and the attenuation stage of the explosion wave, and they are greatly affected by the hydrogen concentration. When the hydrogen concentration increases from 66.7 vol% to 80 vol%, the detonation wave in the propagation stage will be replaced by a deflagration wave. The peak values of velocity, pressure, and temperature in the explosion process generally show a decreasing trend, and the attenuation speed in the attenuation stage gradually slows down after the explosion reaction. The morphology of Fe@C nanoparticles prepared by the hydrogen-oxygen explosion is closely related to the propagation and attenuation of explosion waves, and it can be controlled by adjusting the hydrogen concentration. When the hydrogen concentration in H₂–O₂ mixture gas is 66.7 vol%, the explosion reaction forms a severe temperature and pressure environment, and the deflagration wave in attenuation stage decays rapidly, as a result, the Fe@C nanoparticles were obtained. As the hydrogen concentration reaches 80 vol%, the velocity and attenuation speed of the deflagration wave in attenuation stage slows down, which prolongs the high-temperature time within the unit interval, and creates a relatively mild temperature and pressure environment for the growth of CNTs. Then the Fe@C nanoparticles with a large number of CNTs were prepared. This study provides a reference for the study of controlled preparation of Fe@C nanoparticles by gaseous detonation method.</div></div>","PeriodicalId":18227,"journal":{"name":"Materials Chemistry and Physics","volume":"331 ","pages":"Article 130141"},"PeriodicalIF":4.3,"publicationDate":"2024-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142721497","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":"Influence of core fluorination on the phase properties of fan-like azobenzene based supramolecules, their cis-trans photoisomerization and photoluminescence dynamics","authors":"Vinayak Adimule ,&nbsp;Kalpana Sharma ,&nbsp;Vandna Sharma ,&nbsp;Pankaj Kumar ,&nbsp;Rangappa Keri ,&nbsp;Rajeev Joshi ,&nbsp;Santosh Nandi","doi":"10.1016/j.matchemphys.2024.130140","DOIUrl":"10.1016/j.matchemphys.2024.130140","url":null,"abstract":"<div><div>The stimuli-responsive, low molecular weight, dynamically tunable photophysical features have long been an important objective that challenges chemists in synthesizing liquid crystal (LC) compounds. Herein, the effect of core fluorination on the mesomorphic behavior of fan-like azobenzene derivatives was reported. Two new series of azobenzene derivatives which differ from each other in the length of the terminal alkoxy side chain as well as fluorine (-F) group substitution on the azobenzene moiety were synthesized <strong>(3a-3c, 4a-4c)</strong> and molecular structures of the compounds were confirmed using various analytical techniques. Absorption spectra of the LC compounds <strong>3b</strong> and <strong>3c</strong> are characterized by ππ∗ transitions around 350–410 nm. The self-assembly of these LC compounds was investigated using polarized optical microscope (POM) and differential scanning colorimetry (DSC). The <em>trans</em>-to-<em>cis</em> photoisomerization of the LC compounds <strong>3b</strong> and <strong>3c</strong> occurs in these absorption bands. The <em>trans</em>-to-<em>cis</em> photoisomerization of LC compounds <strong>3b</strong> and <strong>3c</strong> showed 4 h and 24.5 h whereas, thermal <em>cis</em>-to-<em>trans</em> isomerization rates were found to be 90s and 100s resulting in tuning of mesophases. Room temperature photoluminescence (RTPL) of LC compounds <strong>3b</strong> and <strong>3c</strong> when excited at 220 nm, 230 nm and 240 nm showed several sharp/weak emission intensity bands. Both the LC compounds (<strong>3b, 3c</strong>) showed sharp blue emission bands and yellow/green/orange colored bands correspond to weak emission spectra when excited at 220 nm. Further, steady state photoluminescence (SSPL) spectra of these both LC compounds revealed sharp near edge emission bands and broad violet emission peaks with higher Stoke's shift as well as full width half maximum (FWHM). Fluorescence lifetime decay (FLD) studies of compound 3 b unveiled an average lifetime (τ) shuttle between 17.24 ns and 103.60 ns at various excitation wavelengths. However, FLD of LC compound <strong>3c</strong> unveiled that the τ fluctuates between 27.00 ns and 102.56 ns at various excitation wavelengths. Quantum yield (QY) decreases for both the LC compounds with an increase in excitation wavelengths. The study proved the importance of the alkoxy side chain at one end of the aromatic ring and core fluorination as a significant tool to modify the LC behavior of azobenzene derivatives. Thus, synthesized azobenzene derivatives are potentially useful for developing permanent optical storage and display devices.</div></div>","PeriodicalId":18227,"journal":{"name":"Materials Chemistry and Physics","volume":"329 ","pages":"Article 130140"},"PeriodicalIF":4.3,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142663136","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":"Investigation of structural, thermal, and electrical properties of sodium-doped oxynitride glass-ceramics","authors":"Natalia Anna Wójcik ,&nbsp;Abbas Saeed Hakeem ,&nbsp;Zuzanna Mielke ,&nbsp;Sharafat Ali","doi":"10.1016/j.matchemphys.2024.130139","DOIUrl":"10.1016/j.matchemphys.2024.130139","url":null,"abstract":"<div><div>This study aimed to investigate the influence of Na₂O addition on the structural, thermal, and electrical characteristics of oxynitride glass-ceramics within the Na–K–Mg–Ca–Al–Si–O–N system. Oxynitride glass-ceramic samples were prepared via spark plasma sintering (SPS) with sodium oxide doping levels ranging from 0 wt% to 12 wt%. FESEM analysis revealed changes in sample morphology with increasing sodium content, indicating the formation of granular structures and sodium-rich clusters in the glass matrix. XRD revealed the presence of nanocrystalline phases in doped samples, primarily (Na,Ca)(Si,Al)₄O₈. IR spectroscopy demonstrated changes in the glass network structure due to sodium, affecting both silicate and aluminum units. Increasing sodium content led to higher crystallinity and a corresponding decrease in sample density. The thermal expansion increased notably with sodium content, attributed to the disruptive effect of sodium ions on the glass-ceramics structure, while thermal conductivity decreased also attributed to this disruption. AC conductivity increased significantly with sodium, indicating enhanced ionic conductivity, while DC conductivity was observed in doped samples at higher temperatures, with activation energies consistent with ionic conduction mechanisms. The exponent-dependent (s) parameter decreased with higher sodium content, suggesting limited ion diffusion.</div></div>","PeriodicalId":18227,"journal":{"name":"Materials Chemistry and Physics","volume":"329 ","pages":"Article 130139"},"PeriodicalIF":4.3,"publicationDate":"2024-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142663134","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}

{"title":"Synthesis and application of Ho³⁺ doped BaGd₂ZnO₅ nanophosphors for enhanced latent fingerprint development and poroscopy","authors":"S.C. Sharma","doi":"10.1016/j.matchemphys.2024.130127","DOIUrl":"10.1016/j.matchemphys.2024.130127","url":null,"abstract":"<div><div>In this study, Ho³⁺-doped BaGd₂ZnO₅ (1–11 mol%) nanophosphors (BGZO:Ho³⁺ NPs) were synthesized through combustion synthesis, utilizing <em>Spirulina</em> leaf extract as a natural green fuel. Luminescence studies revealed that the BGZO:Ho³⁺ phosphors exhibit a strong green emission primarily resulting from the ⁵S₂→⁵I₈ transition of Ho³⁺ ions. The optimal doping concentration was found to be 7 mol % Ho³⁺, which yielded the highest luminescence efficiency. Furthermore, the CIE chromaticity coordinates for BGZO:7Ho³⁺ were accurately determined to be (0.2595, 0.7290), with a color purity (CP) of 99.98 %. These results indicate the potential of this material for producing high-quality green emissions suitable for solid-state lighting and display applications. Optimized BGZO:Ho³⁺ NPs were utilized for latent fingerprints (LFPs) development via the powder dusting method. Under 365 nm UV light, the NPs effectively revealed Level I-III fingerprints (FPs) details, including ridge patterns, minutiae, and sweat pore features, on various substrates such as glass, plastic, and metal. The high luminescence of BGZO:Ho³⁺ NPs under UV illumination offers a sensitive and non-destructive method for enhancing FPs visibility, making it a promising tool for forensic applications. In addition, this study focuses on FPs poroscopy, examining the detailed pore structure of LFPs for forensic identification. Using advanced imaging techniques, we analyzed sweat pore distribution, size, and shape across various substrates and conditions. A detailed poroscopic analysis of LFPs, focusing on key parameters such as pore interspacing (165–332 μm), pore size (4140–9956 μm²), shapes (elliptical, rhomboid, triangular, square and rectangular) and pore angle (167°–179°). Further, a mathematical model was developed using <em>Python</em>-based software to enable precise and accurate analysis of FPs, enhancing clarity and identification accuracy, supporting the uniqueness of FPs beyond ridge patterns. The results demonstrate the potential of poroscopy for enhancing FPs analysis by offering an additional layer of precise biometric data.</div></div>","PeriodicalId":18227,"journal":{"name":"Materials Chemistry and Physics","volume":"329 ","pages":"Article 130127"},"PeriodicalIF":4.3,"publicationDate":"2024-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142663450","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":"Exploring the synergistic potential: A comprehensive review of MXene-Based composite electrocatalysts","authors":"Mehdi Mehrpooya ,&nbsp;Mozhgan Hadavand ,&nbsp;Mohammad Reza Ganjali","doi":"10.1016/j.matchemphys.2024.130076","DOIUrl":"10.1016/j.matchemphys.2024.130076","url":null,"abstract":"<div><div>MXenes, a prominent category of 2D materials consisting of transition metal carbides, nitrides, and carbonitrides, have garnered significant interest since the introduction of Ti₃C₂T_x. This fascination arises from their exceptional attributes like their high special surface area, superb electrical conductivity, and remarkable mechanical strength. These qualities have established MXenes as top materials for electrocatalysis, a critical component of clean energy conversion technologies. Crucially, MXenes serve as the foundation for the next generation of electrocatalysts, aiming at high activity, selectivity, and sustainability.</div><div>In electrocatalysis, MXene composites enhance the performance of various reactions, such as water splitting and fuel cell operations. When combined with metals, metal oxides, or other conductive materials, MXenes exhibit improved electrical conductivity and catalytic activity. These composites can achieve higher efficiency and selectivity in electrochemical reactions, making them suitable for sustainable energy applications. MXene composites also play an significant role in the development of supercapacitors, which are energy storage devices characterized by rapid charge and discharge capabilities. The high special surface area and excellent conductivity of MXenes increase charge storage and improve energy and power density. When MXene composites are mixed with materials such as polymers or other nanomaterials, they can further optimize these properties, leading to increased performance and longevity. Also in battery technology, MXene composites are used to improve the performance of anodes and cathodes. Their high capacity for ion storage and conduction contributes to higher energy density and faster charge/discharge rates. By combining MXenes with other materials, researchers are able to create advanced battery systems that overcome traditional limitations, resulting in batteries that are more efficient, durable, and capable of delivering higher performance. In this study MXene–Carbon composites, MXene-LDH composites, MXene-Polymer composites, MXene-MOF composites are reviewed and discussed. The versatility of MXenes is further enhanced when they are composited with various other materials. Such compositions allow for tailoring their innate properties, enabling a widespread range of applications. In terms of environmental implications, MXenes and their composites boast excellent reducibility, conductivity, and biocompatibility, making them very appropriate for use in environmental clean-up and protection applications.</div></div>","PeriodicalId":18227,"journal":{"name":"Materials Chemistry and Physics","volume":"332 ","pages":"Article 130076"},"PeriodicalIF":4.3,"publicationDate":"2024-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142743762","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":"Expansion of thermodynamic calculation principle of multi-component alloy and its application in the study of thermodynamic properties of the Cr–Mo–Nb–V high entropy alloy","authors":"Yiqing Wang,&nbsp;Cai Li,&nbsp;Ye Yuan,&nbsp;Yimao Yu,&nbsp;Kai Wang,&nbsp;Yuan Huang","doi":"10.1016/j.matchemphys.2024.130131","DOIUrl":"10.1016/j.matchemphys.2024.130131","url":null,"abstract":"<div><div>In this paper, based on the improved Miedema model and the quaternary alloy calculation model expanded by Chou model, the activity calculation model of the ternary alloy system is extended to the quaternary alloy system through the ternary alloy activity calculation model of Wagner and Ma Zhongting et al. In addition, a new deviation function is used in the expanded quaternary alloy calculation model to calculate the thermodynamic properties of quaternary alloys, which meets the characteristics of both non-negativity and reducibility. Using the developed model, this paper calculates the thermodynamic data of each sub-binary, sub-ternary, and quaternary system in the Cr–Mo–Nb–V quaternary high entropy alloy system. Subsequently, this paper analyzes the interactions between components, predicts the possible precipitated phases in the alloy system, and explains the possibility of forming a solid solution in the alloy system. The final results are consistent with those shown in the literatures on studying the Cr–Mo–Nb–V quaternary alloy system, which verifies the applicability of the developed model in the miscible alloy system, enriches the thermodynamic database of Cr–Mo–Nb–V alloy, and provides theoretical reference and ideas for the design of multi-component alloys.</div></div>","PeriodicalId":18227,"journal":{"name":"Materials Chemistry and Physics","volume":"329 ","pages":"Article 130131"},"PeriodicalIF":4.3,"publicationDate":"2024-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142663456","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":"Effect of pressure-induced lattice distortion on physical properties of L10-FeNi ordered alloy","authors":"Tai-min Cheng,&nbsp;Qing-qing Fan,&nbsp;Guo-qing chai,&nbsp;Xin-xin Zhang,&nbsp;Guo-liang Yu","doi":"10.1016/j.matchemphys.2024.130137","DOIUrl":"10.1016/j.matchemphys.2024.130137","url":null,"abstract":"<div><div>The ground-state properties of tetragonal <em>L</em>1₀ type FeNi alloy have been thoroughly studied, while its physical properties under high pressure are poorly understood. Here, the effect of pressure on the structural, magnetic, mechanical and dynamical properties of <em>L</em>1₀-FeNi are systematically investigated from the first principles calculations. The critical pressure of ferromagnetic collapse is detected to be 250 GPa, and the system is mechanically and dynamically stable below the critical pressure. The pressure-induced lattice distortion is identified in the pressure range of 80–150 GPa. Within this pressure range, the magnetic moments of the system decrease dramatically, the elastic constants <em>C</em>₁₂, <em>C</em>₁₃, <em>C</em>₃₃ and bulk modulus <em>B</em> show softening behavior, and consequently the ductility, longitudinal sound velocity, and acoustic Grüneisen constant exhibit softening behavior, while the elastic anisotropy increase sharply. Furthermore, there are significant variations in magnetocrystalline anisotropy, coercivity, maximum magnetic energy product and magnetic hardness parameters within the pressure range of lattice distortion. More interesting is the discovery that the pressure-induced lattice distortion triggers a transition from semi-hard to hard magnet near 130 GPa.</div></div>","PeriodicalId":18227,"journal":{"name":"Materials Chemistry and Physics","volume":"329 ","pages":"Article 130137"},"PeriodicalIF":4.3,"publicationDate":"2024-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142663449","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":"Synthesis and characterization of synergetic Pd/MoO3–rGO hybrid material as efficient electrode for supercapacitor application","authors":"Waritnan Wanchan ,&nbsp;Gaurav Kumar Yogesh ,&nbsp;Rungsima Yeetsorn ,&nbsp;Yaowaret Maiket ,&nbsp;Pankaj Koinkar","doi":"10.1016/j.matchemphys.2024.130134","DOIUrl":"10.1016/j.matchemphys.2024.130134","url":null,"abstract":"<div><div>In this work, study synthesized Pd–rGO and Pd/MoO₃–rGO nanocomposites via a one-pot hydrothermal method, serving as efficient electrodes for supercapacitor applications. Various analytical techniques, including XRD, XPS, HRTEM, BET, and Raman spectroscopy, were employed to characterize the structural, morphological, and physiochemical properties to assess the electrochemical supercapacitor performance of nanocomposite materials. The analyses confirmed that the charge transfer mechanism between the MoO₃-NR with Pd-rGO in Pd/MoO₃–rGO samples has significantly improved the electrochemical performance of Pd/MoO₃–rGO by 2.7 times compared to Pd-rGO sample (105.00 F/g at 0.5 A/g). Remarkably, the Pd/MoO₃–rGO hybrid material exhibited excellent electrochemical activity, boosting a specific capacitance of 291.50 F/g at a current density of 0.5 A/g, accompanied by energy density and power density values of 18.06 Wh/kg and 250.00 W/kg, respectively. Furthermore, it demonstrated noteworthy stability over prolonged usage, retaining 88.46 % of its capacity after 1000 cycles at a constant current density of 1.0 A/g. These findings underscore the promising potential of the Pd/MoO₃–rGO nanocomposite as a highly effective electrode material for supercapacitors.</div></div>","PeriodicalId":18227,"journal":{"name":"Materials Chemistry and Physics","volume":"331 ","pages":"Article 130134"},"PeriodicalIF":4.3,"publicationDate":"2024-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142721513","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":"Novel hybrid adsorbent for cationic dye decoloration: Zero-valent nickel nanoparticles supported on activated carbon incorporated in electrospun polyacrylonitrile nanofibers","authors":"Badr M. Thamer ,&nbsp;Faiz A. Al-aizari ,&nbsp;Ibrahim A. Alnaser ,&nbsp;Mohamed H. El-Newehy ,&nbsp;Abdullah M. Al-Enizi","doi":"10.1016/j.matchemphys.2024.130132","DOIUrl":"10.1016/j.matchemphys.2024.130132","url":null,"abstract":"<div><div>In this study, zero-valent nickel (ZVNi) supported on high porous activated carbon (HPAC) was successfully prepared and impregnated into polyacrylonitrile nanofibers (PAN NFs) by electrospinning to design nanofiber composite called ZVNi@HPAC/PAN NFs. The produced ZVNi@HPAC and PAN NFs its composite were characterized using a variety of characterization techniques, including FESEM, TEM, XRD, EDX, FTIR and TGA. The adsorption performance of the PAN NFs and ZVNi@HPAC/PAN NFs was evaluated under varying conditions of initial concentration of crystal violet dye (CV) (25–1000 mg/L), pH (3–10), temperature (25–40 °C), ionic strength (0.05–0.3 M) and time (5 min–24 h). The synergistic effect on adsorption performance resulting from the combination of the ZVNi@HPAC and PAN NFs was studied by batch adsorption test. Isothermal studies confirmed that the Langmuir model is the most accurate for simulating the results of crystal violet dye adsorption. The ZVNi@HPAC composite exhibited a high adsorption capacity (q_max) of 723.75 mg/g compared to 69.75 mg/g for pure PAN NFs at pH 10 and 40 °C. ZVNi@HPAC showed superior CV dye removal efficiency of 96 % even at high concentrations (300 mg/L), within a short time of 60 min, compared to 27 % efficiency for PAN NFs. The ZVNi@HPAC/PAN NFs exhibit high reusability by keeping adsorption performance at more than 98.79 % after ten reuse cycles.</div></div>","PeriodicalId":18227,"journal":{"name":"Materials Chemistry and Physics","volume":"329 ","pages":"Article 130132"},"PeriodicalIF":4.3,"publicationDate":"2024-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142663133","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":"Development of an efficient, lead-free piezoelectric nanogenerator utilizing PVDF: MnO2–Bi2WO6: RGO composite fiber for self-powered sensing and biomechanical energy harvesting","authors":"Y. Khazani ,&nbsp;E. Rafiee ,&nbsp;A. Samadi","doi":"10.1016/j.matchemphys.2024.130136","DOIUrl":"10.1016/j.matchemphys.2024.130136","url":null,"abstract":"<div><div>In this study, we have fabricated a highly efficient, environmentally safe, and flexible piezoelectric nanogenerator (PENG) utilizing a composite material comprising manganese oxide-bismuth tungstate (MnO₂–Bi₂WO₆), polyvinylidene fluoride (PVDF), and reduced graphene oxide (RGO) by an optimized electrospinning technique. The PENG constructed with aluminum-based electrodes demonstrates an open-circuit voltage of 5 V and a short-circuit current of 2 μA under the influence of a compressive force measuring 10 N at a frequency of 3 Hz. These measurements were 3.2 and 3.3 times higher, respectively, than those of the original PVDF PENG. Moreover, the optimized PENG achieved an instantaneous power density of 0.4 mW. The exceptional performance of the nanogenerator can be ascribed to the synergistic blend of the <em>β</em>-phase PVDF polymer, the non-centrosymmetric characteristics of MnO₂–Bi₂WO₆ nanosheets, and the electrical conductivity provided by RGO. Additionally, to evaluate both its capacity for sensing and energy harvesting capabilities, the fabricated PENG was utilized for detecting diverse human movements and charging multiple capacitors. Observations revealed that mechanical stimulation could charge a capacitor with a capacity of 1 μF–5 V within 2.4 s, suggesting a viable platform for removing the requirement of an external power source for operating portable devices. As a result, the created PENG exhibits considerable promise and can serve as a viable substitute for traditional power sources in self-sustaining devices, providing its stability and flexibility.</div></div>","PeriodicalId":18227,"journal":{"name":"Materials Chemistry and Physics","volume":"329 ","pages":"Article 130136"},"PeriodicalIF":4.3,"publicationDate":"2024-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142663451","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}