Vacuum最新文献

{"title":"Effects of translation misalignment on ion optics with slit apertures","authors":"Zhi Yang ,&nbsp;Honghui Guo ,&nbsp;Hongtao Liu ,&nbsp;Jinwei Bai ,&nbsp;Yong Cao","doi":"10.1016/j.vacuum.2024.113793","DOIUrl":"10.1016/j.vacuum.2024.113793","url":null,"abstract":"<div><div>For ion thrusters, the deflection of the ion beam caused by the relative translation of the grids is one of the primary factors limiting the erosion lifetime of the ion optical system. A two-dimensional (2D) simulation package of the ion optic system is developed to investigate the ion sputtering corrosion due to grid translation misalignment. For benchmark cases, the 2D simulation package shows a reasonable consistency compared to the experimental method in ion beam deflection angle and drain-to-beam current ratio, indicating the effectiveness of the simulation package. The deviation between the simulated deflection angle and the experimental value is within 8.86%. Furthermore, this 2D package is employed to analyze the variation patterns of ion beam, ion collection, and the distribution of ion sputtering rates caused by grid translation. The simulation results indicate that the ion beam deflection occurs in the direction opposite to grid translation. The number of ions collected at different positions on the acceleration grid shows different tendencies. Only the upstream surface <span><math><msub><mrow><mi>S</mi></mrow><mrow><mi>y−</mi></mrow></msub></math></span> and the aperture surface <span><math><msub><mrow><mi>S</mi></mrow><mrow><mi>x+</mi></mrow></msub></math></span> will be subjected to energetic ion impingement. The sputtering of energetic ions on these two surfaces becomes the dominant factor limiting the grid’s ion corrosion lifetime when the grid translation is significant. The sputtering rate of energetic ions can exceed that of charge exchange (CEX) ions by more than 10 times. The proportion of the region where energetic ions contribute to sputtering expands with increasing grid misalignment, reaching up to 52.5% on surface <span><math><msub><mrow><mi>S</mi></mrow><mrow><mi>x+</mi></mrow></msub></math></span>. Additionally, the downstream surface <span><math><msub><mrow><mi>S</mi></mrow><mrow><mi>y+</mi></mrow></msub></math></span> and the aperture surface <span><math><msub><mrow><mi>S</mi></mrow><mrow><mi>x−</mi></mrow></msub></math></span> are only subjected to CEX ion sputtering regardless of grid translation. Moreover, the CEX ion sputtering regions on surfaces <span><math><msub><mrow><mi>S</mi></mrow><mrow><mi>x−</mi></mrow></msub></math></span> and <span><math><msub><mrow><mi>S</mi></mrow><mrow><mi>x+</mi></mrow></msub></math></span> expand as the grid misalignment distance increases. The peak in the ion sputtering rate distribution profile on surface <span><math><msub><mrow><mi>S</mi></mrow><mrow><mi>y+</mi></mrow></msub></math></span> becomes more prominent due to grid translation, with the sputtering rate at the peak position reaching approximately 1.65 times that of the surrounding lower-rate regions. The analysis of the electric field indicates that local electric field variations caused by grid misalignment are the underlying reason for the ion erosion characteristics.</div></div>","PeriodicalId":23559,"journal":{"name":"Vacuum","volume":"231 ","pages":"Article 113793"},"PeriodicalIF":3.8,"publicationDate":"2024-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142659408","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 behavior and SERS properties of self-grown Ag/Ag-Nb nano-island films sputtered on flexible substrates","authors":"Haitao Zheng ,&nbsp;Mingshuai Shen ,&nbsp;Zunyan Xie ,&nbsp;Ziyi Li ,&nbsp;Mengran Zhang ,&nbsp;Haoliang Sun","doi":"10.1016/j.vacuum.2024.113802","DOIUrl":"10.1016/j.vacuum.2024.113802","url":null,"abstract":"<div><div>Ag-Nb alloy films with varying Nb content were deposited on flexible polyimide substrates by the magnetron sputtering metho. The results show that dense and monodisperse Ag nano-islands were self-grown on the surfaces of as-deposited Ag-31.1 at% Nb alloy films. FDTD simulations revealed that the local electric field strength is closely related to the covering Ag layer, size and spacing of self-grown nano-islands. A 166-nm Ag-31.1 % Nb alloy film covered with 15-nm Ag layer served as the SERS substrate presented excellent and stable SERS performance and can detect 5 × 10⁻¹⁴ mol/L R6G solution. The preparation method of Ag nano-island/alloy films offers a novel approach for producing reproducible and highly sensitive SERS substrates.</div></div>","PeriodicalId":23559,"journal":{"name":"Vacuum","volume":"231 ","pages":"Article 113802"},"PeriodicalIF":3.8,"publicationDate":"2024-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142586935","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":"Novel Carbon@BaMoZrFe12O19 photocatalytic peroxymonosulfate activation for ibuprofen removal","authors":"Abeer A. AlObaid ,&nbsp;Jin Yang ,&nbsp;Sajid Mahmood ,&nbsp;Ghulam Abbas Ashraf ,&nbsp;Noor Hassan ,&nbsp;Raqiqa Tur Rasool ,&nbsp;Muhammad Adnan ,&nbsp;Zeeshan Ajmal ,&nbsp;Amna Mir","doi":"10.1016/j.vacuum.2024.113801","DOIUrl":"10.1016/j.vacuum.2024.113801","url":null,"abstract":"<div><div>This study reports a successful synthesis of a novel Carbon@BaMoZrFe₁₂O₁₉ Mhexaferrite photocatalyst (NPs) using the coprecipitation method. Afterthat, the NPs were used as an activator for peroxymonosulfate (PMS) to remove ibuprofen (IBU) from water. NPs were subjected for a thorough characterization process utilizing various analytical techniques including XRD, FTIR, UV, PL TEM, SEM/EDS, and X-ray photoelectron spectroscopy (XPS). Significantly, the utilization of NPs for PMS activation demonstrated a notable improvement in the elimination of IBU under visible light. The research conducted a thorough investigation into the effects of various parameters, such as activating systems, initial pH, inorganic salts, IBU contents, and water matrix on the efficiency of IBU degradation. The significance of reactive oxygen species, such as sulfate and hydroxyl radicals, as well as singlet oxygen, in the removal of IBU, was clarified by chemical quenching tests. In addition, NPs exhibited competent magnetic separation and reprocessing capacities. The magnetic NPs revealed excellent constancy and recyclability, by sustaining degrading productivity after five consecutive cycles. Therefore, the present study offers a significant contributions to the understanding of photocatalytic degradation for organic pollutants through the utilization of magnetic photocatalysts.</div></div>","PeriodicalId":23559,"journal":{"name":"Vacuum","volume":"231 ","pages":"Article 113801"},"PeriodicalIF":3.8,"publicationDate":"2024-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142659508","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":"Ni and Sb improve the microstructure, mechanical properties, and solder joint reliability of Sn-3.0Ag-0.5Cu alloy","authors":"Biao Wang ,&nbsp;Jikang Yan ,&nbsp;Jiangshan Liu ,&nbsp;Jianhua Zhao ,&nbsp;Lingyan Zhao","doi":"10.1016/j.vacuum.2024.113782","DOIUrl":"10.1016/j.vacuum.2024.113782","url":null,"abstract":"<div><div>In this study, SAC305-0.1Ni and SAC305-0.1Ni-<em>x</em>Sb (<em>x</em> = 1.5 wt %, 2.0 wt %, 2.5 wt %) composite solders were fabricated by incorporating Ni and Sb alloying elements into Sn3.0Ag0.5Cu (SAC305) solder. A comprehensive investigation was carried by utilizing X-ray diffraction (XRD), scanning electron microscopy (SEM), differential scanning calorimetry (DSC), microhardness tests, nanoindentation, transmission electron microscopy (TEM), and a universal mechanical testing machine. The effects of Ni and Sb additions on microstructures, thermal properties, wettability, mechanical characteristics, as well as thermal aging, interfacial growth, and mechanical properties of welded joints were systematically explored, and these results were compared with SAC305 solder. The results indicated that the incorporation of Sb and Ni enhanced the microstructure of the solder alloy through the formation of (Cu, Ni)₆Sn₅ and SnSb phases, leading to a 23.90 % increase in the solder wetted area. Additionally, the formation of (Cu, Ni)₆Sn₅ and SnSb intermetallic compounds (IMC) increased resistance to dislocation motion, thereby enhancing the mechanical properties of the solder alloys in comparison to SAC305 solder. The creep resistance of the solder alloys was significantly improved, with a corresponding 49.19 % increase in Vickers hardness. During the thermal aging of solder joints, the interfacial growth coefficient decreased, with the SAC305-0.1Ni-2.0Sb joints exhibiting the lowest value at 0.0185. Furthermore, the co-addition of Ni and Sb consistently enhanced the mechanical properties of the welded joints. The average tensile strength of SAC305-0.1Ni-2.0Sb joints reached 77.87 MPa, which represents a 28.45 % increase compared to SAC305 joints. As the Sb content increased, the fracture mode transitioned from brittle fracture to ductile fracture, and eventually to a mixed ductile-brittle fracture.</div></div>","PeriodicalId":23559,"journal":{"name":"Vacuum","volume":"231 ","pages":"Article 113782"},"PeriodicalIF":3.8,"publicationDate":"2024-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142586936","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":"In situ formation SiC nanowires on loofah sponge-derived porous carbon for efficient electromagnetic wave absorption","authors":"Xiaolin Guo ,&nbsp;Haiyu Li ,&nbsp;Zhaoyang Zhang ,&nbsp;Pengfei Xing ,&nbsp;Shuai Wang ,&nbsp;Shengnan Jiang ,&nbsp;Yanxin Zhuang","doi":"10.1016/j.vacuum.2024.113769","DOIUrl":"10.1016/j.vacuum.2024.113769","url":null,"abstract":"<div><div>A lightweight, heterogeneous, three-dimensional network-structured composite has been meticulously developed with the specific goal of optimizing impedance matching and elevating electromagnetic wave absorption properties. SiC nanowires-carbon composites were synthesized through a novel process involving combined carbothermal reduction and chemical vapor deposition, utilizing loofah sponge as the foundational material. Accessible and cost-effective organosilane waste was applied as the silicon source. The resulting composites manifest exceptional electromagnetic wave absorption performance with a minimum reflection loss of −46.34 dB and a wide effective bandwidth of 3.84 GHz at a thin thickness of 1.9 mm. Superior electromagnetic wave absorption is attributed to synergistic interplay of multiple interfacial polarizations, dipole polarization, conductive losses, and multiple reflections and scattering. This work presents an innovative pathway toward fabricating highly efficient electromagnetic wave-absorbing materials while effectively repurposing recycled waste.</div></div>","PeriodicalId":23559,"journal":{"name":"Vacuum","volume":"231 ","pages":"Article 113769"},"PeriodicalIF":3.8,"publicationDate":"2024-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142657371","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":"Mo vacancies enhancing Pt, Ni co-incorporated Mo2C nanofibers for high-efficiency water decomposition","authors":"Keke Huang ,&nbsp;Yaotian Yan ,&nbsp;Jingxuan Li ,&nbsp;Liang Qiao ,&nbsp;Jiehe Sui ,&nbsp;Wei Cai ,&nbsp;Xiaohang Zheng","doi":"10.1016/j.vacuum.2024.113792","DOIUrl":"10.1016/j.vacuum.2024.113792","url":null,"abstract":"<div><div>Hard alloy type compounds are promising candidates for developing robust and cost-effective electrocatalysts due to the good conductivity and lattice hardness. However, their insufficient intrinsic activities require further surface modification, which remains a significant challenge due to the high hardness and surface inertness. Herein, a vacancies-promoted heteroatoms integration method is provided to construct Pt and Ni co-incorporated molybdenum carbide nanofibers ((Pt, Ni)-Mo₂C). The Pt and Ni atoms filling into the Mo vacancy reduce the formation energy by ∼5.5 eV, which indicates an improved crystal stability. The electrons flow from Mo, Ni centers to Pt, C centers, resulting in the shifted average valence of Mo, Ni sites and moderate oxidation states of Pt, C sites. Therefore, the hydrogen adsorption free energy (ΔG_∗H) of Mo and C sites increases from ∼-0.6 eV to ∼-0.03 eV (C sites) and ∼-0.2 eV (Mo sites), resulting in a state closer to ideal state (0 eV). As a result, the (Pt, Ni)-Mo₂C catalyst exhibits an excellent overpotential of 64 mV at 10 mA cm⁻² for hydrogen evolution reaction (HER), reducing by 149 mV than pure Mo₂C. Current work paves a favorable method for integrating dissimilar atoms to modify hard alloy type compound surface.</div></div>","PeriodicalId":23559,"journal":{"name":"Vacuum","volume":"231 ","pages":"Article 113792"},"PeriodicalIF":3.8,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142659411","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":"Single-layer GaInTe3: Water-splitting photocatalyst low exciton binding and ultrahigh solar conversion efficiency","authors":"Jia-Yu Bao ,&nbsp;Si-Hai Wen ,&nbsp;Yi Xiang ,&nbsp;Le-Jun Wang ,&nbsp;Tong-De Rao ,&nbsp;Wen-Bo Yuan ,&nbsp;Chun-Ming Yang ,&nbsp;Mei-Ying Huang ,&nbsp;Yong-Sheng Xie ,&nbsp;Kai Wu ,&nbsp;Lei Hu","doi":"10.1016/j.vacuum.2024.113795","DOIUrl":"10.1016/j.vacuum.2024.113795","url":null,"abstract":"<div><div>Herein, we analyze the water decomposition possibility of single-layer (SL) GaInTe₃ under the −2% to +2 % biaxial strain via first-principles stimulations. Our results find that SL GaInTe₃ exhibits effective separation of photogenerated electrons and holes, which is strongly affirmed by the electronic property and the quite loose exciton binding. Furthermore, SL GaInTe₃ has a suitable band edge and excellent visible-light capture ability, making it an ideal candidate for solar-assisted water decomposition. In addition, SL GaInTe₃ shows a solar-to-hydrogen (STH) conversion of more than 33.0 %, further emphasizing its potential as a highly efficient photocatalyst. In conclusion, SL GaInTe₃ has been supported by conclusive evidence as a photocatalytic material with excellent performance, providing new support and encouragement for the development of hydrogen production technology. Moreover, the effective thickness of 2D materials is defined as the largest spreading height of the electron cloud in covalent bonds perpendicular to the 2D atomic plane.</div></div>","PeriodicalId":23559,"journal":{"name":"Vacuum","volume":"231 ","pages":"Article 113795"},"PeriodicalIF":3.8,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142572293","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":"Multicore@shell nanoparticle synthesis from a single multicomponent target by gas aggregation source","authors":"Amir Mohammad Ahadi ,&nbsp;Tim Tjardts ,&nbsp;Salih Veziroglu ,&nbsp;Marie Elis ,&nbsp;Thomas Strunskus ,&nbsp;Lorenz Kienle ,&nbsp;Franz Faupel ,&nbsp;Alexander Vahl","doi":"10.1016/j.vacuum.2024.113794","DOIUrl":"10.1016/j.vacuum.2024.113794","url":null,"abstract":"<div><div>Synthesis of multifunctional nanomaterials is known as a critical challenge in advanced nanoscience. Multicore@shell nanostructures are generated here via a gas phase synthesis approach. To achieve this objective, we used conventional DC magnetron sputtering in conjunction with a gas aggregation chamber. We employed a customized Au-Ti target to produce metal-metal oxide multicore@shell nanoparticles (NPs) with tunable properties. The deposited NPs were characterized with regard to their chemical composition, morphology, structural status, NP size distribution and optical properties. The obtained data clearly confirms that the crystalline Au cores are encapsulated in a TiOx matrix in each individual NP. Furthermore, the chemical composition and size distribution of the NPs can be affected by the operating pressure. Our approach provides a versatile route with many different possibilities to synthesize multicore@shell NPs from a variety of composite targets for well-desired applications including environmental, optical/plasmonic, and energy.</div></div>","PeriodicalId":23559,"journal":{"name":"Vacuum","volume":"231 ","pages":"Article 113794"},"PeriodicalIF":3.8,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142659409","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Tailoring oxygen vacancies in Ga2O3 thin films and controlled formation of Ga2O3/SiO2 heterostructures via annealing","authors":"Asma O. Al Ghaithi ,&nbsp;Inas Taha ,&nbsp;Sumayya M. Ansari ,&nbsp;Nitul Rajput ,&nbsp;Baker Mohammad ,&nbsp;Haila M. Aldosari","doi":"10.1016/j.vacuum.2024.113791","DOIUrl":"10.1016/j.vacuum.2024.113791","url":null,"abstract":"<div><div>This study examines the effects of annealing duration on the oxygen vacancies in gallium oxide (Ga₂O₃) thin films. Ga₂O₃ thin films were deposited by RF magnetron sputtering on (100) silicon substrates and subsequently annealed in an argon atmosphere at 1000 °C for 1, 2, 4, and 7 h. The impact of the annealing time on the morphology, oxygen content, optical bandgap, and thickness of Ga₂O₃ thin films was thoroughly investigated. All annealed films exhibited a polycrystalline β-Ga₂O₃ phase with a monoclinic crystal structure and a preferred orientation along the (400) plane. Increasing the annealing time resulted in larger grains, a denser interfacial layer, and reduced microstrain. Prolonged annealing also facilitated the escape of oxygen atoms, creating oxygen vacancies that formed a defect band below the conduction band, significantly lowering the optical bandgap. Cross-sectional transmission electron microscopy revealed a Ga₂O₃/SiO₂ heterostructure formation, with Ga₂O₃ thickness decreasing and SiO₂ thickness increasing with longer annealing times. These findings enhance the understanding of the role of annealing in optimizing Ga₂O₃ thin films for electronic and optoelectronic applications.</div></div>","PeriodicalId":23559,"journal":{"name":"Vacuum","volume":"231 ","pages":"Article 113791"},"PeriodicalIF":3.8,"publicationDate":"2024-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142572212","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":"Microscopic scale analysis of the dynamic changes of the melt pool and the evolution of dendritic structure during L-DED of GH3536 alloy","authors":"Kaikai Xu ,&nbsp;Yadong Gong ,&nbsp;Jibin Zhao ,&nbsp;Qiang Zhao","doi":"10.1016/j.vacuum.2024.113790","DOIUrl":"10.1016/j.vacuum.2024.113790","url":null,"abstract":"<div><div>This paper presents the establishment of a melt pool flow model, wherein the solute field and phase field are concurrently integrated to simulate the dynamic transformations within the melt pool and the evolution of dendrites during the solidification process. Experimental validation affirms the model's precision. The simulation outcomes indicate the persistence of a pronounced symmetry within the melt pool throughout the flow process. Intriguingly, perturbations in the powder and variations in heat transfer give rise to a vortex-like internal flow pattern within the melt pool. These findings align harmoniously with the experimental results concerning the dimensions of the melt pool (melt width, melt depth, and melt height). Specifically, the growth rate of dendrite tips and the dendrite count exhibit significant sensitivity to alterations in temperature gradient. As the temperature gradient escalates, the primary dendrite arm spacing diminishes, accompanied by heightened development of secondary dendrite arms. In congruence with the simulated dendrite evolution process, the microstructure within the deposited layer derived from experimental observations primarily comprises columnar crystals. The growth of dendrites unfolds perpendicularly to the melt pool boundary, following the trajectory of decreasing temperature gradient, thereby mirroring the simulated dendrite evolution process.</div></div>","PeriodicalId":23559,"journal":{"name":"Vacuum","volume":"231 ","pages":"Article 113790"},"PeriodicalIF":3.8,"publicationDate":"2024-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142572214","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}