Journal of Science: Advanced Materials and Devices最新文献

{"title":"Design and analysis of quasi-vertical multi-fin GaN power devices based on epitaxially grown GaN-on-sapphire","authors":"Jeong Woo Hong,&nbsp;Sang Ho Lee,&nbsp;Jin Park,&nbsp;Min Seok Kim,&nbsp;Seung Ji Bae,&nbsp;Won Suk Koh,&nbsp;Gang San Yun,&nbsp;In Man Kang","doi":"10.1016/j.jsamd.2025.100848","DOIUrl":"10.1016/j.jsamd.2025.100848","url":null,"abstract":"<div><div>This study presents the design and analysis of a quasi-vertical multi-fin gallium nitride (GaN) power device based on GaN-on-sapphire epitaxy, simulated using three-dimensional technology computer-aided design. The proposed structure aims to overcome the limitations of lateral high-electron-mobility transistors for high-power applications, as well as to address the cost issues associated with fully vertical GaN structures. Device optimization began with a single-fin structure and progressed incrementally. First, we determined the optimal doping concentration for n-type GaN in the drift region and channel, followed by the application and analysis of the trench drain, source field plate, and multi-fin structures. The optimized device achieves impressive performance, with a specific on-resistance of 0.85 mΩ cm², a breakdown voltage of 1263 V, and a Baliga's figure of merit of 1.87 GW cm⁻². This study's systematic optimization and structural analysis provide valuable insights into enhancing device characteristics for high-power semiconductor applications and contribute to a deeper understanding of the electrical properties of quasi-vertical fin-type power devices.</div></div>","PeriodicalId":17219,"journal":{"name":"Journal of Science: Advanced Materials and Devices","volume":"10 1","pages":"Article 100848"},"PeriodicalIF":6.7,"publicationDate":"2025-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143092759","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":"Microwave-assisted facile synthesis of graphitic-C3N4/reduced graphene oxide/MoS2 composite as the bifunctional electrocatalyst for electrochemical water splitting","authors":"Sumanta Sahoo ,&nbsp;Abdullah Al Mahmud ,&nbsp;Ankur Sood ,&nbsp;Ganesh Dhakal ,&nbsp;Santosh K. Tiwari ,&nbsp;Sunmi Zo ,&nbsp;Hong Mi Kim ,&nbsp;Sung Soo Han","doi":"10.1016/j.jsamd.2024.100843","DOIUrl":"10.1016/j.jsamd.2024.100843","url":null,"abstract":"<div><div>Bifunctional electrocatalysts have shown considerable research attention in the field of water splitting in the last few years. The current work reports a simple microwave (MW)-assisted synthetic approach for the fabrication of nanocomposite based on graphitic-C₃N₄, reduced graphene oxide (rGO), and MoS₂. Notably, the ternary composite was synthesized through ultrafast MW irradiation within a short duration by a cost-effective synthetic route. The synthesized composite served as the suitable electrocatalyst for both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). The overpotential of the composite was 172 mV for HER and 380 mV for OER. Moreover, the Tafel slopes for HER and OER were 147 and 97 mV dec⁻¹ for HER and OER, respectively. It is further interesting to note that the composite also displayed admirable stability of 24 h for overall water splitting. Inclusively, the current work demonstrated an efficient rGO-supported MW-assisted inexpensive synthetic approach for the development of 2D bifunctional electrocatalysts.</div></div>","PeriodicalId":17219,"journal":{"name":"Journal of Science: Advanced Materials and Devices","volume":"10 1","pages":"Article 100843"},"PeriodicalIF":6.7,"publicationDate":"2025-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143102326","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":"Harnessing Z-scheme charge transfer in ultrathin C3N5/TiO2@Ti3C2Cl2 MXene nanosheets for sustainable water purification, hydrogen evolution, and biocompatibility","authors":"Mojtaba Rostami ,&nbsp;Ghodsi Mohammadi Ziarani ,&nbsp;Alireza Badiei ,&nbsp;Jahan bakhsh Ghasemi ,&nbsp;Mohammad Khazaei ,&nbsp;Milad Jourshabani ,&nbsp;Byeong Kyu Lee","doi":"10.1016/j.jsamd.2024.100846","DOIUrl":"10.1016/j.jsamd.2024.100846","url":null,"abstract":"<div><div>MXenes have recently emerged as one of the most promising conductive supports for photocatalytic water remediation and hydrogen evolution reaction (HER) electrocatalysts. This study presented the synthesis of a novel nanocomposite, TiO₂@Ti₃C₂Cl₂, using a one-step molten salt-shielded (MS³) method under an air atmosphere at a low temperature of 1000 °C. A unique aspect of this process was the successful extraction of copper from molten salt using iron bars without any chemical agents. The synthesized TiO₂@Ti₃C₂Cl₂ was subsequently coupled with low band-gap carbon nitride (C₃N₅) via an ultrasonic (US) technique, forming a Z-scheme ternary (C₃N₅/TiO₂@Ti₃C₂Cl₂) nanocomposites with a 2D/0D/2D structure. The ternary nanocomposite exhibited remarkable photocatalytic performance, achieving 100% efficiency in degrading dye molecules under optimal conditions, which included a pH of 5, a nanophotocatalyst dose of 100 ppm, a rhodamine B (Rh B) concentration of 10 ppm, room temperature, and a reaction time of 30 min. The C₃N₅/TiO₂@Ti₃C₂Cl₂/Cu composite also exhibited promising electrocatalytic performance for HER with a Tafel slope of 103 mV.dec⁻¹ and an overpotential of 51 mV at a current density of 10 mA cm⁻² under alkaline conditions. The significant improvement in photocatalytic water remediation and HER performance is likely due to several key factors: the strong interfacial coupling between the 2D/0D/2D materials, which promotes efficient charge separation; the reduced recombination rate of electron-hole pairs, enhancing photocatalytic efficiency; the highly improved electron-transfer processes, which accelerate reaction kinetics; and the increased number of exposed photo- and electrocatalytic active sites, providing more surface area for reactions. These combined effects result in better overall performance for photocatalytic and HER applications. Furthermore, the MTT assay demonstrated a reduction in the toxicity of C₃N₅ upon forming the ternary nanocomposite. These findings suggest that the synthesized ternary nanocomposite enhances photocatalytic and HER efficiency and reduces toxicity, making it a valuable material for environmental and energy applications.</div></div>","PeriodicalId":17219,"journal":{"name":"Journal of Science: Advanced Materials and Devices","volume":"10 1","pages":"Article 100846"},"PeriodicalIF":6.7,"publicationDate":"2025-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143092760","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":"Polybutadiene polyurethane acrylate photosensitive resin and its application in 3D printing","authors":"Hang Ning ,&nbsp;Shaoyun Chen ,&nbsp;Yan'e Liu ,&nbsp;Bo Qu ,&nbsp;Yanyu Zheng ,&nbsp;Xiaoying Liu ,&nbsp;Wenjie Li ,&nbsp;Rui Wang ,&nbsp;Nairong Chen ,&nbsp;Dongxian Zhuo","doi":"10.1016/j.jsamd.2024.100844","DOIUrl":"10.1016/j.jsamd.2024.100844","url":null,"abstract":"<div><div>High-performance resins that can withstand temperature changes are required to expand the application potential of additive manufacturing (3D printing) in response to increasing demand from various fields. In this study, a novel 3D-printing polybutadiene polyurethane acrylate photosensitive resin named HTPBMA was prepared by mixing hydroxyl-terminated polybutadiene (HTPB) as the base material with other active diluent monomers and photoinitiators, including hydroxypropyl methacrylate (HPMA). The resulting resins exhibited good rheological properties and rapid photocuring ability, depending on the type and proportion of diluent monomer. In particular, the tensile strength and elongation at break of the sample with a 65:35 HTPBMA:HPMA ratio at −25 °C were 32.9 MPa and 246.1%, respectively, being 2.13 and 1.58 times the values at room temperature, respectively. These results indicate that HTPBMA exhibits excellent low-temperature performance and physical properties. The enhancement mechanism can likely be attributed to introducing of a flexible carbon chain as well as increased cross-linking density (υ_<em>e</em>). These advantages suggest that the novel photosensitive resin designed and prepared in this study can be used for photocuring 3D printing and maintain excellent performance under extreme climatic conditions. Thus, the proposed HTPBMA has broad application prospects in aerospace and materials science, especially in shoe materials and tires.</div></div>","PeriodicalId":17219,"journal":{"name":"Journal of Science: Advanced Materials and Devices","volume":"10 1","pages":"Article 100844"},"PeriodicalIF":6.7,"publicationDate":"2024-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143092758","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":"Design, characterization, and electromagnetic performance of a flexible wideband RF antenna using composite materials","authors":"Saïd Douhi ,&nbsp;Salesabil Labihi ,&nbsp;Adil Eddiai ,&nbsp;Soufian Lakrit ,&nbsp;Mounir El Achaby ,&nbsp;Ahmed Jamal Abdullah Al-Gburi","doi":"10.1016/j.jsamd.2024.100847","DOIUrl":"10.1016/j.jsamd.2024.100847","url":null,"abstract":"<div><div>Traditional microwave and microelectronic technologies typically use metal components for high efficiency, but their rigidity and susceptibility to corrosion limit their suitability for wearable applications. To meet the demand for flexible, high-performance materials in wearable communication systems, this study investigates the use of Poly (vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) combined with calcium- and zirconium-doped barium titanate (BCZT) as a novel substrate for microwave applications. A flexible wideband antenna was developed using a PVDF-HFP/BCZT composite, with BCZT particles enhancing the composite's thermal stability, crystallinity, and dielectric performance. Conductive fabric was employed for the antenna's radiating elements, supporting both flexibility and user comfort. The antenna was fabricated via laser cutting and tested in free space and on a human body model, achieving a resonant frequency of 5.94 GHz, a return loss of −48.32 dB, and a wide bandwidth of 5.10–6.40 GHz, with VSWR below 2 and a radiation efficiency of 60%. Specific absorption rate (SAR) testing with a multilayer human tissue model yielded values of 1.22 W/kg (1g) and 0.366 W/kg (10g), in compliance with international safety standards. Experimental results closely aligned with simulations, demonstrating the potential of PVDF-HFP/BCZT-based antennas as eco-friendly, high-performance solutions for wearable technologies, achieving an effective balance between flexibility and efficiency.</div></div>","PeriodicalId":17219,"journal":{"name":"Journal of Science: Advanced Materials and Devices","volume":"10 1","pages":"Article 100847"},"PeriodicalIF":6.7,"publicationDate":"2024-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143102317","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":"The formation of strain-induced martensite and its influence on hydrogen compatibility of metastable austenitic stainless steels: A state-of knowledge review","authors":"Zhiyang Fan ,&nbsp;Xiaoyu Gong ,&nbsp;Bei Li ,&nbsp;Peichen Yu ,&nbsp;Xinyang Liu ,&nbsp;Hongyu Zhou ,&nbsp;Yinsheng He ,&nbsp;Wenyue Zheng","doi":"10.1016/j.jsamd.2024.100842","DOIUrl":"10.1016/j.jsamd.2024.100842","url":null,"abstract":"<div><div>Austenitic stainless stainless steels (ASS) are an important type of material used in hydrogen storage and handling equipment because of their exceptional corrosion resistance and mechanical qualities. Nevertheless, the hydrogen sensitivities of metastable ASS would be a notable concern since the strain-induced martensitic transformation (SIMT) can take place during the fabrication process. Hence, we performed tensile experiments on 304L and 316L alloys containing varying amounts of Ni content, simulating actual material deformation conditions. We conducted an analysis of the impact of Ni content on SIMT and presented a detailed description of the martensite nucleation and growth process. Subsequently, we conducted an analysis of the orientation connection of the martensitic transition using TEM. Subsequently, we summarized the effects of SIMT and hydrogen on the tensile, creep, and fatigue properties of materials. It was generally observed that in a hydrogen environment, SIMT, as a high-speed diffusion channel for hydrogen, exacerbates the detrimental effect of hydrogen on the material's mechanical properties. The significance of minimizing SIMT to enhance the hydrogen performance of metastable ASS is emphasized, and this article concluded by summarizing the practical methods for reducing the SIMT: optimizing the alloy composition, controlling the deformation temperature, and using post-forming annealing treatment. Through discussion, it was concluded that controlling the deformation temperature is not recommended as a method to eliminate strain-induced martensite.</div></div>","PeriodicalId":17219,"journal":{"name":"Journal of Science: Advanced Materials and Devices","volume":"10 1","pages":"Article 100842"},"PeriodicalIF":6.7,"publicationDate":"2024-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143102324","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":"The influence of measuring current on the calculation of anisotropic magnetoresistance in magnetic nanostructures","authors":"Guillermo Gestoso ,&nbsp;David de Cos ,&nbsp;María Luisa Fdez-Gubieda ,&nbsp;Alfredo García-Arribas","doi":"10.1016/j.jsamd.2024.100838","DOIUrl":"10.1016/j.jsamd.2024.100838","url":null,"abstract":"<div><div>Using a multiscale approach, we investigate the influence of measuring current on the calculated anisotropic magnetoresistance of nanostructures, derived from the magnetization configuration obtained with micromagnetic codes. We analyze the subtle implicit assumptions and potentially overlooked approximations inherent in standard procedures that largely disregard the inhomogeneous distribution of electric current within the sample and the magnetic field generated by the current itself. As a preliminary study, we review various methods for determining resistance from the calculated magnetization distribution. We then focus on the impact of non-uniform current distribution arising from variations in resistivity due to different local magnetization orientations. Finally, we assess the significance of the magnetic field produced by the measuring current. For these analyses, we develop self-consistent procedures that iteratively solve the micromagnetic problem using MuMax3 and the Laplace equation with COMSOL Multiphysics. In general, our results validate the standard approach of calculating anisotropic magnetoresistance directly from the angle of the magnetization provided by micromagnetic codes, especially for typical (small) values of the magnetoresistance coefficient. However, we demonstrate that materials with larger AMR coefficients may require more sophisticated calculation methods. An important aspect for comparison with experimental results is the analysis of electrical contacts, where the measuring current can significantly alter the magnetization distribution and, consequently, the magnetoresistance of the nanostructure, even for small AMR coefficients.</div></div>","PeriodicalId":17219,"journal":{"name":"Journal of Science: Advanced Materials and Devices","volume":"10 1","pages":"Article 100838"},"PeriodicalIF":6.7,"publicationDate":"2024-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143102321","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":"Bio-inspired coatings for natural fibre composites","authors":"Thinesh Sharma Balakrishnan ,&nbsp;Mohamed Thariq Hameed Sultan ,&nbsp;Farah Syazwani Shahar ,&nbsp;Kamarul Arifin Ahmad ,&nbsp;Sharul Sham Dol ,&nbsp;Fatin Hana Naning","doi":"10.1016/j.jsamd.2024.100841","DOIUrl":"10.1016/j.jsamd.2024.100841","url":null,"abstract":"<div><div>Natural fibre composites (NFC) are gaining popularity due to their versatility and environmental benefits, but they often need enhancements to withstand extreme conditions and maintain performance across various applications. Bio-inspired coatings offer a promising solution by mimicking natural systems to develop advanced properties such as self-cleaning, water repellency, thermal regulation, and corrosion resistance. This review examines recent advancements in bio-inspired coatings for NFC, highlighting a range of innovative coatings and their unique properties. We discuss the latest developments, applications, and the specific challenges these coatings address in NFC contexts. Additionally, the review explores future research opportunities, including the integration of emerging technologies like nanotechnology and additive manufacturing. By providing an overview of the current state of bio-inspired coatings for NFC, this review aims to encourage further research and innovation in this rapidly growing field.</div></div>","PeriodicalId":17219,"journal":{"name":"Journal of Science: Advanced Materials and Devices","volume":"10 1","pages":"Article 100841"},"PeriodicalIF":6.7,"publicationDate":"2024-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143102325","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":"Temperature-dependent properties of Cu-doped ZnTe thin films deposited on ultra-thin glass substrates via RF magnetron sputtering","authors":"Nur Irwany Ahmad ,&nbsp;Ahmad Wafi Mahmood Zuhdi ,&nbsp;Camellia Doroody ,&nbsp;Yap Boon Kar ,&nbsp;Mohd Nazri Abd Rahman ,&nbsp;Kazi Sajedur Rahman ,&nbsp;Mohd Natashah Norizan ,&nbsp;Muhammad Najib Harif ,&nbsp;Tiong Sieh Kiong","doi":"10.1016/j.jsamd.2024.100836","DOIUrl":"10.1016/j.jsamd.2024.100836","url":null,"abstract":"<div><div>This study investigates the viability of Cu-doped ZnTe as a potential back surface field (BSF) layer on flexible CdTe thin-film solar cells, examining its structural, morphological, optical, and electrical properties. ZnTe, 5%, and 8% Cu-doped ZnTe were deposited on ultra-thin glass (UTG) substrates using the radio frequency (RF) magnetron sputtering approach at varying substrate temperatures from room temperature to 300 °C. The finding reveals that the surface morphology significantly changes as the substrate temperature increases. Besides, incorporating Cu into ZnTe resulted in a denser and rougher surface, likely due to material densification and accelerated grain growth at higher temperatures. X-ray diffraction (XRD) analysis indicated that the crystallite size of the ZnTe and Cu-doped ZnTe increased with higher temperatures. Optical spectroscopy results demonstrated an increase in the optical band gap of ZnTe with increasing substrate temperature, while Cu-doping introduced a significant variability in the bandgap, particularly at different doping levels. In terms of electrical properties, ZnTe thin films exhibited carrier concentrations around 10¹⁴ cm⁻³. Conversely, the introduction of 5% and 8% Cu into ZnTe increased carrier concentrations, ranging from 10¹⁷ to 10²⁰ cm⁻³, respectively, depending on substrate temperature and the amount of Cu concentration. Introducing Cu in the ZnTe structure may modify the characteristics of ZnTe thin films, potentially influencing its suitability as a BSF layer in CdTe solar cells by affecting its structural, optical, and electrical properties.</div></div>","PeriodicalId":17219,"journal":{"name":"Journal of Science: Advanced Materials and Devices","volume":"10 1","pages":"Article 100836"},"PeriodicalIF":6.7,"publicationDate":"2024-12-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143102323","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":"Nanosecond laser structuring for improving rate capability of lithium iron phosphate cathode","authors":"Dongkyu Park ,&nbsp;Dongkyoung Lee","doi":"10.1016/j.jsamd.2024.100840","DOIUrl":"10.1016/j.jsamd.2024.100840","url":null,"abstract":"<div><div>LiFePO₄ cathode's low-capacity retention at high current rates is due to its low electrical conductivity. To address this, a three-dimensional cathode was fabricated using a nanosecond laser. Its performance was studied based on groove aspect ratios (0.39, 0.96) and pitch distances (112 μm, 224 μm). Groove morphology varied with laser parameters. Cathodes with higher aspect ratios exhibited lower internal resistance. However, capacity decreased as groove pitch distance narrowed. The normalized specific capacity of the 3D cathode with an aspect ratio of 0.36 and a pitch distance of 224 μm was 6% higher than that of an unstructured cathode at a 2C rate.</div></div>","PeriodicalId":17219,"journal":{"name":"Journal of Science: Advanced Materials and Devices","volume":"10 1","pages":"Article 100840"},"PeriodicalIF":6.7,"publicationDate":"2024-12-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143102320","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}