Diamond and Related Materials最新文献

{"title":"Preparation and performances of conductive, wear-resistant, and anti-corrosion coatings based on low content monodisperse SWCNTs","authors":"Zhiqi Wang ,&nbsp;Tiannan Man ,&nbsp;Zhisheng Nong,&nbsp;Chunyang Jia,&nbsp;Keming Ma,&nbsp;Baichen Wang,&nbsp;Yue Xing,&nbsp;Shaowei Lu","doi":"10.1016/j.diamond.2024.111694","DOIUrl":"10.1016/j.diamond.2024.111694","url":null,"abstract":"<div><div>Single-walled carbon nanotubes (SWCNTs) are considered an ideal candidate material for multifunctional coatings because of their excellent electrical, thermal and mechanical properties. However, achieving uniform dispersion of SWCNTs while maintaining their structure and performance remains a significant challenge. The monodisperse SWCNTs (m-SWCNTs) can be obtained using a non-covalent PVP dispersant under the graded homogenization method. PVP acted as steric hindrance due to the π-π conjugate, thereby hindering the agglomeration and preventing the damage of SWCNTs. We incorporate low amounts of m-SWCNTs into fluorocarbon (FC) coatings to fabricate m-SWCNTs/FC composite coatings. We also investigate the effect of m-SWCNTs content on the electrical conductivity, corrosion resistance and wear resistance of the composite coating. Our results indicate that when the content of m-SWCNTs reaches at 0.25 wt%, the electrical resistivity of the m-SWCNTs/FC composite coating is 1.67 × 10⁻² Ωm, significantly decreased by 9 orders of magnitude compared to FC coating. The conductive network would be formed by the high aspect ratio and non-damaged of m-SWCNTs to improve the conductivity. Additionally, the wear rate containing 0.15 wt% m-SWCNTs decreased by 50.1 % due to the improved strength and heat conduction to inhibit the adhesive wear. Furthermore, in comparison to bare steel, the corrosion current density of 0.15 wt% m-SWCNTs/FC composite coating is reduced by two orders of magnitude due to zigzag the corrosive path. Our studies suggest that the m-SWCNTs/FC composite coatings have a broad prospect in preparing large-scale, high-performance, and low-cost functional coatings.</div></div>","PeriodicalId":11266,"journal":{"name":"Diamond and Related Materials","volume":"150 ","pages":"Article 111694"},"PeriodicalIF":4.3,"publicationDate":"2024-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142662988","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":"Growth of homoepitaxial single crystal diamond by microwave plasma CVD in H2-CH4-O2 gas mixtures at high microwave power densities","authors":"A.P. Bolshakov ,&nbsp;V.Yu. Yurov ,&nbsp;I.A. Fedorova ,&nbsp;A.K. Martyanov ,&nbsp;P.V. Fedotov ,&nbsp;A.F. Popovich ,&nbsp;V.G. Ralchenko ,&nbsp;B. Dai","doi":"10.1016/j.diamond.2024.111721","DOIUrl":"10.1016/j.diamond.2024.111721","url":null,"abstract":"<div><div>Single crystal diamond growth by microwave plasma assisted CVD in oxygen-containing gas mixtures is attractive in view of possibility to realize a prolonged non-stoped synthesis process and to minimize defects and impurities in the produced material. We studied the homoepitaxial diamond growth on (100) oriented substrates in H₂-CH₄-O₂ environment at high pressures (300 Torr) and high microwave power density (≈400 W/cm³) at variable O₂ content (up to 3.5 %) in the plasma. A low-coherence optical interferometry and optical emission (OE) spectroscopy was used to measure in situ the growth rate and probe the plasma chemistry, respectively. Depending on CH₄ content the growth rate dependence on the concentration [O₂] either shows a maximum at certain [O₂], or a monotonic decline, up to complete stop of the growth at some critical O₂ percentage (specific for each methane content) in the mixture. We found CH, H_β, C₂ and C₃ lines in OE spectra from the plasma to monotonically quenched with O₂ adding, particularly, disappearance of the C₂ line coincidences with growth rate going to zero. High-quality homoepitaxial diamond layers were produced at moderate growth rate at optimal gas composition and characterized with Raman spectroscopy. Moreover, a significant reduction in the stress on (111) oriented substrates owing to O₂ addition was observed.</div></div>","PeriodicalId":11266,"journal":{"name":"Diamond and Related Materials","volume":"150 ","pages":"Article 111721"},"PeriodicalIF":4.3,"publicationDate":"2024-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142578287","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":"A BDD-Au/SPCE-based electrochemical DNA aptasensor for selective and sensitive detection of theophylline","authors":"Yeni Wahyuni Hartati ,&nbsp;Ratu Shifa Syafira ,&nbsp;Irkham Irkham ,&nbsp;Salma Nur Zakiyyah ,&nbsp;Jarnuzi Gunlazuardi ,&nbsp;Takeshi Kondo ,&nbsp;Qonita Kurnia Anjani ,&nbsp;Prastika Krisma Jiwanti","doi":"10.1016/j.diamond.2024.111725","DOIUrl":"10.1016/j.diamond.2024.111725","url":null,"abstract":"<div><div>The proposed aptasensor using a DNA aptamer for the detection of theophylline (THEO) is being reported for the first time, as previous methods predominantly employed RNA aptamers. DNA aptamers have attracted significant attention due to their advantages over antibodies, including greater stability and cost-effectiveness, making them ideal for various diagnostic applications as biosensors. THEO, a drug commonly used in the treatment of respiratory diseases such as asthma, requires precise monitoring in the bloodstream due to its narrow therapeutic index. In this paper, we present the first optimization of THEO detection using a DNA aptamer-based sensor (aptasensor), utilizing a composite boron-doped diamond/Gold (BDD-Au) on screen-printed carbon electrodes. Thiolated DNA aptamers were immobilized on the BDD-Au surface, where they selectively targeted THEO in biological samples. Optimization of the aptasensor was achieved using a Box-Behnken design, determining optimal conditions of 3.0 μM for aptamer concentration, 90 min for aptamer immobilization time, and 1.0 mM for tris(2-carboxyethyl)phosphine concentration. The resulting DNA aptasensor demonstrated excellent selectivity for THEO, with a linear detection range from 1 to 1.0 mM and a detection limit of 52 nM. The sensor maintained stability for up to four weeks and exhibited high recovery rates when tested in blood serum, highlighting its potential for clinical monitoring of THEO levels.</div></div>","PeriodicalId":11266,"journal":{"name":"Diamond and Related Materials","volume":"150 ","pages":"Article 111725"},"PeriodicalIF":4.3,"publicationDate":"2024-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142586426","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":"Green carbon nanospheres for integrated photo-supercapacitors device with improved efficiency","authors":"B. Arjunkumar ,&nbsp;R.V. Mangalaraja ,&nbsp;C. Ragupathi ,&nbsp;Gopal Ramalingam ,&nbsp;Mohammed Mujahid Alam ,&nbsp;Abdullah G. Al-Sehemi ,&nbsp;S.K. Anbukumaran","doi":"10.1016/j.diamond.2024.111699","DOIUrl":"10.1016/j.diamond.2024.111699","url":null,"abstract":"<div><div>Achieving a low-cost, high-yield, and environmentally acceptable synthesis of graphene is a significant problem in nanomaterials research. Hence, carbon nanospheres are receiving an increased attention. We have developed a unique and cost-effective method of producing carbon nanospheres from carbon soot. Carbon nanospheres were created using castor oil and virgin green leaf (<em>Anisomeles Malabarica</em>) and then thoroughly examined. When applied to dye-sensitised solar cells and the integrated photo-supercapacitor, the produced soot exhibited the same behavior as reduced graphene oxide. Photoconversion efficiency was 8.47 % in the dye-sensitised solar cells application and in the symmetric supercapacitor device application, it exhibited 11.83 mWh/cm² of energy density and 0.3 mW/cm² of power density which illuminated an LED bulb up to 60 s. The capacitive retention of 85.2 % was achieved after 3000 cycles. Finally, the integrated photo-supercapacitor performed about 3.3 % of the overall efficiency and 38 % of the storage efficiency.</div></div>","PeriodicalId":11266,"journal":{"name":"Diamond and Related Materials","volume":"150 ","pages":"Article 111699"},"PeriodicalIF":4.3,"publicationDate":"2024-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142578289","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":"3D printer fabrication of boron doped Cu-MWCNT/PLA electrodes: Investigation of its efficiency in electrocatalytic hydrogen production","authors":"Evrim Baran Aydin ,&nbsp;Sevgi Ateş","doi":"10.1016/j.diamond.2024.111720","DOIUrl":"10.1016/j.diamond.2024.111720","url":null,"abstract":"<div><div>In this study, three-dimensional (3D) electrodes based on MWCNT-Cu/PLA with high electrocatalytic efficiency, large surface area and different amounts of nano‑boron doped MWCNT-Cu/PLA were fabricated using Fused Granular Fabrication (FGF) method with a 3D printer. When FE-SEM images are examined, MWCNT fibers and copper particles are seen more clearly on the surface due to the formation of more dense conductive networks between the conductive carbon fibers trapped in the PLA structure due to the increasing amount of boron. When XRD results are examined, it is observed that the characteristic peaks belonging to the face-centered cubic structure of Cu are dominant and the crystal size increases as MWCNT addition and boron doping increase. When Raman spectra were analyzed to investigate the internal structural changes of MWCNTs, three characteristic bands corresponding to the D band (defect), G band (graphite band) and G' band (D overtone) of MWCNTs were determined and it was observed that the I_D/I_G ratio decreased with increasing boron doping compared to MWCNT-Cu/PLA electrode. The B1s spectrum of the 3D 0.8B@MWCNT-Cu/PLA electrode confirmed the presence of boron with the peak corresponding to B@C bonds at 191.2 eV. The obtained 3D electrocatalysts were used as cathodes in an electrolysis cell in aqueous solution containing 1 M KOH and their catalytic efficiency in hydrogen evolution reaction (HER) was tested. In order to increase the activity of the 3D electrodes, unlike the literature, they were activated by electrochemical activation process without using organic solvent and HER measurements of the activated electrodes were performed. Before activation, the charge transfer resistance (R_ct) value of the Cu/PLA electrode, which was 6219.00 Ω cm⁻², decreased to 681.90 Ω cm⁻² after 5 % MWCNT doping. It is seen that with boron doping, a greater decrease in Rct value is realized, reaching values of 66.50–74.56 Ω cm⁻². The cathodic Tafel slopes show that the Volmer reaction is the rate-determining step for HER and the rate-determining step is the electrochemical adsorption of hydrogen on the metal surface. In addition, energy efficiency tests of the 3D electrodes in HER were also performed and electrochemically active surface areas were determined. Thus, this study has taken an important step toward using 3D electrocatalysts, which are produced with more cost and more flexible designs, unlike previous production techniques, for hydrogen energy production.</div></div>","PeriodicalId":11266,"journal":{"name":"Diamond and Related Materials","volume":"150 ","pages":"Article 111720"},"PeriodicalIF":4.3,"publicationDate":"2024-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142578290","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":"A three-components-based disposable electrochemical sensor for the detection of heavy metal ions in water","authors":"Muhammad Z. Farooq ,&nbsp;Muhammad Akram ,&nbsp;Masooma Irfan ,&nbsp;Hidayat Ullah ,&nbsp;Muhammad Tariq ,&nbsp;Muhammad Yasir ,&nbsp;Ayaz Hassan","doi":"10.1016/j.diamond.2024.111718","DOIUrl":"10.1016/j.diamond.2024.111718","url":null,"abstract":"<div><div>The development of an efficient sensor based on a novel three-components nanocomposite is presented for the detection of heavy metal ions (Cd²⁺ and Pb²⁺) in water. For the preparation of three-components nanocomposite surface, the polydopamine reduced graphene oxide (PyDA/RGO) composite was initially prepared by a one-step polymerization of dopamine (DA) on RGO followed by surface modification of the prepared composite with cysteine (Cys). The formation of three-components nanocomposite surface (i.e., Cys/PyDA/RGO) was initially confirmed through physical characterization techniques, including X-ray diffraction and infrared spectroscopy, whereas scanning electron microscopy revealed the surface morphology after each step of sensor fabrication. The electrochemical properties of the sensing platform were evaluated through electrochemical techniques, including cyclic voltammetry and electrochemical impedance spectroscopy with an external ferri‐−/ferrocyanide redox probe. The prepared three-components nanocomposite on disposable pencil graphite electrode (Cys/PyDA/RGO/PGE) showed an improved charge transfer rate as compared to PyDA/RGO/PGE and bare PGE electrode. Targeted heavy metal ions were detected on the sensor surface using differential pulse voltammetry with greater sensitivity, showing detection limits of 0.77 and 1.13 ppb for Cd⁺² and Pb⁺² ions in citrate buffer solution, respectively. The sensor demonstrated comparable performance in the tap water samples.</div></div>","PeriodicalId":11266,"journal":{"name":"Diamond and Related Materials","volume":"150 ","pages":"Article 111718"},"PeriodicalIF":4.3,"publicationDate":"2024-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142572782","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":"Synergistic effect of argon plasma and heterojunction of g-C3N4 and GO on BiVO4 for photocatalytic application","authors":"Rehaboth Nissi J. ,&nbsp;Sudharsan Bangaru ,&nbsp;Jibu Thomas ,&nbsp;K. Navaneetha Pandiyaraj ,&nbsp;A. Arunkumar ,&nbsp;B. Vidhya","doi":"10.1016/j.diamond.2024.111691","DOIUrl":"10.1016/j.diamond.2024.111691","url":null,"abstract":"<div><div>The ternary heterojunction, BiVO₄/GO/g-C₃N₄ was synthesized via hydrothermal method under a temperature of 180 °C. The prepared materials are post treated with glow discharge argon plasma treatment. Prepared materials shows monoclinic phase of BiVO₄ and they show rod like structure. The plasma treated material shows improved degradation rate, the heterojunction after the plasma treatment (RBNP) gives 96 % of methylene blue decomposition in 180 min. The photocatalytic result is in accordance with the recombination rate of electron-hole pairs and presence of oxygen vacancies. The presence of oxygen vacancies are confirmed by XPS and EPR results. The BET analysis result confirms the presence of higher specific surface area in the plasma treated heterojunction sample, RBNP. The solution with highest degradation rate has been used for growing fenugreek plants to study the toxic effect of degraded solution on plant growth. The phytotoxicity result confirms that, the degraded solution can only slightly affect the shoot length of the plant while retaining the root length.</div></div>","PeriodicalId":11266,"journal":{"name":"Diamond and Related Materials","volume":"150 ","pages":"Article 111691"},"PeriodicalIF":4.3,"publicationDate":"2024-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142663045","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 characterizations of nanohybrids based on amino silane-graphene oxide decorated by zirconium oxide nanoparticles","authors":"Narimene ZERGUINE ,&nbsp;Yasin ALTIN ,&nbsp;Abdesselam DAHOUN ,&nbsp;Said BOUHELAL","doi":"10.1016/j.diamond.2024.111727","DOIUrl":"10.1016/j.diamond.2024.111727","url":null,"abstract":"<div><div>This study aims to synthesize graphene oxide using the modified Hummers method and subsequently functionalize the surface of graphene oxide with amino silane N-(b-aminoethyl)-c-aminopropyltrimethoxysilane (AEAPTMS), resulting in silane-graphene oxide (SGO). The surface of SGO is then decorated with zirconium oxide (ZrO₂) nanoparticles, generating SGO-ZrO₂ nanohybrids. All the synthetized materials GO, SGO and SGO-ZrO₂ were subjected to various characterization techniques, including Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), Thermogravimetric analysis (TGA), Zeta potential measurement and Scanning electron microscope (SEM). The results revealed that GO nanosheets were decorated with ZrO₂ nanoparticles through covalent bonding with AEAPTMS.</div></div>","PeriodicalId":11266,"journal":{"name":"Diamond and Related Materials","volume":"150 ","pages":"Article 111727"},"PeriodicalIF":4.3,"publicationDate":"2024-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142561319","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":"The ultra-low friction mechanism of diamond film by in-situ forming of graphene sheet on sliding interface","authors":"Hui Song ,&nbsp;Pengwei Zhang ,&nbsp;Guoyong Yang ,&nbsp;He Li ,&nbsp;Lifeng Deng ,&nbsp;Nan Jiang ,&nbsp;Kazhihito Nishimura","doi":"10.1016/j.diamond.2024.111723","DOIUrl":"10.1016/j.diamond.2024.111723","url":null,"abstract":"<div><div>In the present study, a novel process of in-situ fabrication of graphene sheets on ultrananocrystalline diamond (UNCD) film with aid of Au layer catalyst was designed. An in-situ ultra strong C<img>C bonds are formed in the graphene-diamond interface under the action of heating, which can decrease the friction coefficient of the film. Besides, the friction-induced formation of graphene nano-scrolls play a pivotal role in achieving an exceptionally low friction coefficient of 0.025 for annealed Au/UNCD film. The potential structural formation mechanisms and frictional mechanisms have been discussed in detail. The achievement in this work provides a novel insight into the in-situ fabrication of graphene-diamond structure in mechanical fields with outstanding low friction coefficient and anti-wear performance.</div></div>","PeriodicalId":11266,"journal":{"name":"Diamond and Related Materials","volume":"150 ","pages":"Article 111723"},"PeriodicalIF":4.3,"publicationDate":"2024-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142578288","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":"Carbon nanotubes modified V-Ti3C2Tx/poly(3,4-ethylenedioxythiophene) composite as a high-performance electrode for supercapacitor","authors":"Ze-Le Lei,&nbsp;Li Wan,&nbsp;Qiu-Feng Lü","doi":"10.1016/j.diamond.2024.111696","DOIUrl":"10.1016/j.diamond.2024.111696","url":null,"abstract":"<div><div>Poly (3,4-ethylenedioxythiophene) (PEDOT) is an electrically conductive polymer that is highly conductive and oxidatively stable. However, its poor cycling stability and small specific capacitance limit its application as an electrode material for supercapacitors. In this work, carbon nanotubes (CNTs) modified V-Ti₃C₂T_x/poly(3,4-ethylenedioxythiophene) composite (CVT/PEDOT) was prepared by obtaining vanadium-doped Ti₃C₂T_x (V-Ti₃C₂T_x) using a simple hydrothermal method, and then polymerizing 3,4-ethylene-dioxythiophene monomers (EDOT) on the surface of carbon nanotubes modified V-Ti₃C₂T_x. The incorporation of CNTs with V-Ti₃C₂T_x results in better stability of CVT/PEDOT. The synergistic effect of the three components make the CVT/PEDOT composite have good electrochemical performance and excellent cycling stability as an electrode material for supercapacitor. The specific capacitance of CVT/PEDOT at a current density of 1 A g⁻¹ is up to 263 F g⁻¹, and the capacitance retention is 86 % after 5000 cycles at a current density of 10 A g⁻¹, which is superior to that of the V-Ti₃C₂T_x/PEDOT composite. The energy density of CVT/PEDOT is 15.26 Wh kg⁻¹ at a power density of 600 W kg⁻¹, which is higher than those of previously reported PEDOTs and other PEDOT-based composites. So, the CVT/PEDOT composite can be a potential candidate for electrode materials of supercapacitor.</div></div>","PeriodicalId":11266,"journal":{"name":"Diamond and Related Materials","volume":"150 ","pages":"Article 111696"},"PeriodicalIF":4.3,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142561402","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}