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Electromagnetic interference shielding performance of nano-structure pyrolytic carbon cement composite
IF 2.7 4区 材料科学
Materials Letters Pub Date : 2025-03-26 DOI: 10.1016/j.matlet.2025.138465
N.K .Karthikeyan, S. Elavenil
{"title":"Electromagnetic interference shielding performance of nano-structure pyrolytic carbon cement composite","authors":"N.K .Karthikeyan,&nbsp;S. Elavenil","doi":"10.1016/j.matlet.2025.138465","DOIUrl":"10.1016/j.matlet.2025.138465","url":null,"abstract":"<div><div>This article comprehensively investigated on the advantage of using Nanostructure Pyrolytic Carbon (NSPC) to develop an electromagnetic interference (EMI) shielding material. The composite composed of a cement matrix with NSPC particle as nano-filler and silica fume (SF) as dispersing material. This study investigated the effect of NSPC particles on electrical resistivity and EMI shielding of cement paste matrix. The experimental results revealed that the dispersion of NSPC particles reduced electrical resistivity to 4953 Ω.cm that reduced two orders of magnitude. NSPC composites (3 wt%) have maximum and average electromagnetic shielding effectiveness of 60.08 dB and 52.61 dB with the highest frequency range for SE &gt; 50 is 9.6–12 GHz. Thus, NSPC particles will be a paradigm shift in material science to develop EMI shielding composites.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"390 ","pages":"Article 138465"},"PeriodicalIF":2.7,"publicationDate":"2025-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143714488","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Honeycomb nanosheets F-Ni2V2O7 grown in situ on nickel foam as efficient OER electrocatalysts
IF 2.7 4区 材料科学
Materials Letters Pub Date : 2025-03-26 DOI: 10.1016/j.matlet.2025.138464
Lingfang Zhao , Xi Sun , Hao Yang , Nannan Dou
{"title":"Honeycomb nanosheets F-Ni2V2O7 grown in situ on nickel foam as efficient OER electrocatalysts","authors":"Lingfang Zhao ,&nbsp;Xi Sun ,&nbsp;Hao Yang ,&nbsp;Nannan Dou","doi":"10.1016/j.matlet.2025.138464","DOIUrl":"10.1016/j.matlet.2025.138464","url":null,"abstract":"<div><div>To design and synthesize high-performance, low-cost, and binder-free oxygen evolution reaction (OER) electrocatalysts is of critical importance for enhancing efficiency of electrocatalytic water splitting (EWS). Honeycomb nanosheets F-Ni<sub>2</sub>V<sub>2</sub>O<sub>7</sub> electrocatalysts, which were grown in situ on nickel foam (NF), were prepared via a facile yet efficacious two-step hydrothermal and immersion methodology. Here F-Ni<sub>2</sub>V<sub>2</sub>O<sub>7</sub> manifested outstanding OER activity, requiring only 270 mV of overpotential to achieve a current density of 100 mA·cm<sup>−2</sup> and a low Tafel slope of 36 mV·dec<sup>-1</sup>. Additionally, it maintained a remarkable stability over 12 h. The particular structural features of F-Ni<sub>2</sub>V<sub>2</sub>O<sub>7</sub> imparted it with the following advantages: (1) the honeycomb nanosheets structure provided an abundance of catalytic sites; (2) F-doping improved the electrical conductivity and augmented the intrinsic active sites; (3) F-doping adjusted the electronic structure, promoting the generation of oxygen vacancies.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"390 ","pages":"Article 138464"},"PeriodicalIF":2.7,"publicationDate":"2025-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143714494","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
An electrolyte additive for realizing stable lithium metal batteries by constructing robust interphase with high mechanical strength and high ionic conductivity
IF 2.7 4区 材料科学
Materials Letters Pub Date : 2025-03-24 DOI: 10.1016/j.matlet.2025.138455
Jinpen Niu, Yanan Li, Yuzhi Chen, Yuxin Ouyang, Bo Wen, Xinyu Da, Wei Yu
{"title":"An electrolyte additive for realizing stable lithium metal batteries by constructing robust interphase with high mechanical strength and high ionic conductivity","authors":"Jinpen Niu,&nbsp;Yanan Li,&nbsp;Yuzhi Chen,&nbsp;Yuxin Ouyang,&nbsp;Bo Wen,&nbsp;Xinyu Da,&nbsp;Wei Yu","doi":"10.1016/j.matlet.2025.138455","DOIUrl":"10.1016/j.matlet.2025.138455","url":null,"abstract":"<div><div>Constructing a stable solid electrolyte interphase (SEI) can effectively enhance the cycling stability of lithium metal batteries (LMBs). In this study, we developed a NaF-doped SEI using sodium bis(trifluoromethylsulfonyl)imide (NaTFSI) as an electrolyte additive. The high Young’s modulus of NaF strengthens the mechanical strength of the SEI, effectively inhibiting the growth of lithium dendrites. Meanwhile, this SEI features abundant grain boundaries and superior interfacial properties, significantly improving Li<sup>+</sup> transport. Consequently, the Li||NCM811 cells with 3 wt% NaTFSI demonstrate outstanding long-term cycling performance and capacity retention (500 cycles, retention: 82.43 %). These results indicate that NaTFSI holds significant potential for enhancing next-generation LMBs.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"390 ","pages":"Article 138455"},"PeriodicalIF":2.7,"publicationDate":"2025-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143705257","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Pd@MoS2 nanosheets based room-temperature hydrogen sensor
IF 2.7 4区 材料科学
Materials Letters Pub Date : 2025-03-24 DOI: 10.1016/j.matlet.2025.138458
Boyi Wang, Zhipeng Li, Liupeng Zhao, Peng Sun
{"title":"Pd@MoS2 nanosheets based room-temperature hydrogen sensor","authors":"Boyi Wang,&nbsp;Zhipeng Li,&nbsp;Liupeng Zhao,&nbsp;Peng Sun","doi":"10.1016/j.matlet.2025.138458","DOIUrl":"10.1016/j.matlet.2025.138458","url":null,"abstract":"<div><div>In this work, we reported a simple, scalable, and low-cost method based on a simple solution process for fabricating room-temperature hydrogen sensors. The sensor was prepared by loading palladium on the ultrasonically exfoliated MoS<sub>2</sub> surface by liquid-phase reduction, and then drop-casting the MoS<sub>2</sub>-containing solution onto a flexible polyimide substrate, and the structural and morphological properties of the Pd@MoS<sub>2</sub> composites were investigated by relevant characterization methods. The fabricated sensors were lightweight, operating at room temperature, and had high sensitivity. The Pd@MoS<sub>2</sub> H<sub>2</sub> sensor had a sensitivity of 4.44 at 15,000 ppm, and a detection limit as low as 300 ppm.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"390 ","pages":"Article 138458"},"PeriodicalIF":2.7,"publicationDate":"2025-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143704284","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Molecular insight into the corrosion resistance and tribological properties of poly(aspartic ester) polyurea cured with different curing agents
IF 2.7 4区 材料科学
Materials Letters Pub Date : 2025-03-24 DOI: 10.1016/j.matlet.2025.138456
Rudong Zhou , Bingjie Lian , Yuan Xia , Jia Cheng , Wen Li
{"title":"Molecular insight into the corrosion resistance and tribological properties of poly(aspartic ester) polyurea cured with different curing agents","authors":"Rudong Zhou ,&nbsp;Bingjie Lian ,&nbsp;Yuan Xia ,&nbsp;Jia Cheng ,&nbsp;Wen Li","doi":"10.1016/j.matlet.2025.138456","DOIUrl":"10.1016/j.matlet.2025.138456","url":null,"abstract":"<div><div>Molecular dynamics (MD) simulations are adopted to investigate the relationship between the molecular structure of isocyanate curing agents and the corrosion resistance and tribological properties of the poly(aspartic ester) (PAE) polyurea coating. Dimer, trimer and silane modified trimer isocyanates (S-trimer) were used as curing agents. The microstructure of the PAE polyurea is revealed by cohesive energy density and free volume. The diffusion behavior of corrosion media and adhesion strength on iron substrate are utilized to estimate the anticorrosion performance. Three-layer friction structures are constructed to analyze the tribological behavior. According to the results, the compactness, adhesion force, and cohesive energy density follow the order of S-trimer &gt; trimer &gt; dimer systems. The S-trimer system has the lowest free volume, resulting in a weaken diffusion ability of corrosive media. A jump diffusion mechanism for the transport of corrosive media is proposed. The silane modification improves the intermolecular interactions and electrostatic interactions, which enhances the wear resistance of the polyurea coating.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"390 ","pages":"Article 138456"},"PeriodicalIF":2.7,"publicationDate":"2025-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143705082","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A complementary precipitated mechanism of grain boundary α phases in metastable β titanium alloy
IF 2.7 4区 材料科学
Materials Letters Pub Date : 2025-03-23 DOI: 10.1016/j.matlet.2025.138450
Chengpeng Zhu , Kening Chen , Bin Kong , ZhengQiao Liu , Bingfeng Wang , Xiao-yong Zhang , Kechao Zhou
{"title":"A complementary precipitated mechanism of grain boundary α phases in metastable β titanium alloy","authors":"Chengpeng Zhu ,&nbsp;Kening Chen ,&nbsp;Bin Kong ,&nbsp;ZhengQiao Liu ,&nbsp;Bingfeng Wang ,&nbsp;Xiao-yong Zhang ,&nbsp;Kechao Zhou","doi":"10.1016/j.matlet.2025.138450","DOIUrl":"10.1016/j.matlet.2025.138450","url":null,"abstract":"<div><div>In titanium alloys, the grain boundary α(α<sub>GB</sub>) phase constitutes a critical microstructural feature whose characteristics affect the mechanical properties of the alloys. However, current understanding of the α<sub>GB</sub> precipitation process remains incomplete, posing significant challenges in precisely controlling its morphology. In this study, we systematically investigated the morphological evolution of α<sub>GB</sub> during distinct precipitation stages and proposed a grain boundary curvature mechanism. During progressive step cooling, α<sub>GB</sub> phases initially nucleate at multiple sites along grain boundaries. Subsequently, α<sub>GB</sub> phases exhibit preferential growth toward one adjacent grain, thereby inducing localized curvature of the grain boundaries. The final stage involves coarsening and coalescence of α<sub>GB</sub> phases, accompanied by the precipitation of grain boundary Widmanstätte α (α<sub>WGB</sub>) colony at the α<sub>GB</sub> particle intersections or the α<sub>GB</sub> phase endpoints. This finding provides a more comprehensive framework for interpreting α<sub>GB</sub> precipitation sequence, but also a theoretical guidance for microstructure tailored strategies in advanced titanium alloys.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"390 ","pages":"Article 138450"},"PeriodicalIF":2.7,"publicationDate":"2025-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143705080","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Investigation of TiCN thin films prepared by cathodic arc deposition for alternative SERS substrates
IF 2.7 4区 材料科学
Materials Letters Pub Date : 2025-03-23 DOI: 10.1016/j.matlet.2025.138454
W. Phae-ngam , T. Chaikeeree , T. Lertvanithphol , K. Dhanasiwawong , G. Gitgeatpong , J. Prathumsit , H. Nakajima , A. Treetong , L. Mathurasa , R. Sangsirimongkolying , S. Limwichean , R. Botta , A. Klamchuen , M. Horprathum
{"title":"Investigation of TiCN thin films prepared by cathodic arc deposition for alternative SERS substrates","authors":"W. Phae-ngam ,&nbsp;T. Chaikeeree ,&nbsp;T. Lertvanithphol ,&nbsp;K. Dhanasiwawong ,&nbsp;G. Gitgeatpong ,&nbsp;J. Prathumsit ,&nbsp;H. Nakajima ,&nbsp;A. Treetong ,&nbsp;L. Mathurasa ,&nbsp;R. Sangsirimongkolying ,&nbsp;S. Limwichean ,&nbsp;R. Botta ,&nbsp;A. Klamchuen ,&nbsp;M. Horprathum","doi":"10.1016/j.matlet.2025.138454","DOIUrl":"10.1016/j.matlet.2025.138454","url":null,"abstract":"<div><div>We report the cathodic arc deposition of TiCN thin films on a silicon wafer substrate at various N<sub>2</sub>/C<sub>2</sub>H<sub>2</sub> flow rate ratios for alternative SERS substrate. Structural, morphological, and electronic structures were analyzed by GIXRD, FE-SEM, and XAS. Spectroscopic ellipsometry (SE) determined the dielectric function and Q-factor to evaluate SERS potential. Our results show that polycrystalline TiCN thin films exhibit plasmonic properties, with highest Q-factor in near-infrared region. Preliminary SERS performance using Rhodamine 6G (R6G) identified the optimal film, at a 2.3 N<sub>2</sub>/C<sub>2</sub>H<sub>2</sub> ratio, achieving a high EF at 10<sup>−6</sup> M and LOD of 2.11 × 10<sup>−7</sup> M. These findings highlight TiCN thin film as promising candidates for SERS sensor applications.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"390 ","pages":"Article 138454"},"PeriodicalIF":2.7,"publicationDate":"2025-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143705079","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Uniform-sized (K, Na)NbO3 nanocrystallines as potential photocatalytic materials 作为潜在光催化材料的均匀尺寸（K、Na）NbO3 纳米晶体
IF 2.7 4区 材料科学
Materials Letters Pub Date : 2025-03-23 DOI: 10.1016/j.matlet.2025.138449
Yanqing Liu, Liangliang Liu, Zhaoping Hou
{"title":"Uniform-sized (K, Na)NbO3 nanocrystallines as potential photocatalytic materials","authors":"Yanqing Liu,&nbsp;Liangliang Liu,&nbsp;Zhaoping Hou","doi":"10.1016/j.matlet.2025.138449","DOIUrl":"10.1016/j.matlet.2025.138449","url":null,"abstract":"<div><div>(K, Na)NbO<sub>3</sub> materials with piezoelectric effect are considered to be very competitive compounds in the field of optoelectronics. The low crystallinity and stability of the raw materials have limited the development of the (K, Na)NbO<sub>3</sub> materials. In this work, a new strategy combining solid phase reaction and molten salt methods has been designed to synthesize (K, Na)NbO<sub>3</sub> powder. Uniform-sized (K, Na)NbO<sub>3</sub> nanocrystallines were obtained in the K<sub>0.5</sub>Na<sub>0.5</sub>NbO<sub>3</sub>-KCl system at 900 °C. The electric properties of the (K, Na)NbO<sub>3</sub> ceramics suggested that the chemical composition of the nanocrystalline closed to the stoichiometric ratio of K<sub>0.5</sub>Na<sub>0.5</sub>NbO<sub>3</sub>. It was found that the degradation rate of (K, Na)NbO<sub>3</sub> nanocrystallines on methylene blue (MB) solution reached 68 % under visible light irradiation. This study shows that (K, Na)NbO<sub>3</sub> has great potential in the environmental remediation of polluted water.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"390 ","pages":"Article 138449"},"PeriodicalIF":2.7,"publicationDate":"2025-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143704283","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Development of a novel PDMS/PEG/PDMS multilayered composite film for advanced thermal management solutions for Photovoltaics
IF 2.7 4区 材料科学
Materials Letters Pub Date : 2025-03-23 DOI: 10.1016/j.matlet.2025.138421
Roshbe S. Calolsa , T.P. Sumangala , Sreeram K. Kalpathy , Tiju Thomas , Mousumi Upadhyay Kahaly , Ariful Rahaman
{"title":"Development of a novel PDMS/PEG/PDMS multilayered composite film for advanced thermal management solutions for Photovoltaics","authors":"Roshbe S. Calolsa ,&nbsp;T.P. Sumangala ,&nbsp;Sreeram K. Kalpathy ,&nbsp;Tiju Thomas ,&nbsp;Mousumi Upadhyay Kahaly ,&nbsp;Ariful Rahaman","doi":"10.1016/j.matlet.2025.138421","DOIUrl":"10.1016/j.matlet.2025.138421","url":null,"abstract":"<div><div>This study presents a novel multilayered composite thin film of polyethylene glycol (PEG4000) sandwiched between two layers of polydimethylsiloxane (PDMS) with a prime focus on improving photovoltaic device efficiency and longevity. The PDMS/PEG/PDMS configuration absorbs heat from the device and near-infrared (NIR) sunlight thereby reducing thermal buildup and preventing material degradation. PDMS/PEG/PDMS film composite was fabricated using the doctor blade technique, this hydrophobic composite undergoes a solid-to-liquid phase transition at approximately 50–60 °C, enhancing thermal energy management. In its liquid state, the film composite exhibits 85.01 % visible transmittance and 11.11 % NIR reflectance, while in solid state, it shows 62.94 % visible transmittance and 13.40 % NIR reflectance. The phase change material (PCM) maintains cyclic stability without leakage and demonstrates a transparency shift with heat absorption, indicating effective thermal cycle stability.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"390 ","pages":"Article 138421"},"PeriodicalIF":2.7,"publicationDate":"2025-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143714495","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Influence of Ni content in the CuNi interlayers on the performance of W/RAFM steel joints via vacuum diffusion bonding 铜镍夹层中的镍含量对真空扩散粘接 W/RAFM 钢接头性能的影响
IF 2.7 4区 材料科学
Materials Letters Pub Date : 2025-03-23 DOI: 10.1016/j.matlet.2025.138453
Huan Song , Zhang Liu , Yuanyuan Chen , Chenxi Liu , Yuan Huang , Zumin Wang
{"title":"Influence of Ni content in the CuNi interlayers on the performance of W/RAFM steel joints via vacuum diffusion bonding","authors":"Huan Song ,&nbsp;Zhang Liu ,&nbsp;Yuanyuan Chen ,&nbsp;Chenxi Liu ,&nbsp;Yuan Huang ,&nbsp;Zumin Wang","doi":"10.1016/j.matlet.2025.138453","DOIUrl":"10.1016/j.matlet.2025.138453","url":null,"abstract":"<div><div>CuNi interlayers varying with different Ni contents were used to bond W with reduced activation ferritic/martensitic (RAFM) steel. The influence of Ni content on the microstructure and mechanical properties of W/CuNi/RAFM steel joints was investigated. The results showed that the well-bonded joints were obtained. Increasing the Ni content in the CuNi alloy interlayers enhanced interdiffusion at the interfaces of the W/CuNi/RAFM steel joints, thereby improving their mechanical properties. Specifically, incorporating an interlayer with 68 % Ni content resulted in a shear strength of up to 350 MPa for the joint. The fracture of the joints mainly occurred in the W substrate near the W/CuNi interface.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"390 ","pages":"Article 138453"},"PeriodicalIF":2.7,"publicationDate":"2025-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143704281","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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