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Diamond and Related Materials
Elsevier Science S.A.
Diamond and Related Materials

Elsevier Science S.A.

0925-9635

Diamond and Related Materials/Journal Diamond and Related MaterialsSCIISTPEI
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    2-Amino-3-chloro-1,4-naphthoquinone covalently anchored on reduced graphene oxide as all-carbon energy storage material

    Yang Y.Qian D.Zhang Z.Li Z....
    9页
    查看更多>>摘要：? 2022 Elsevier B.V.Further increasing the energy density of supercapacitors without reducing their high power density and stability remains a challenge. Organic quinone molecules have demonstrated potential in electrochemical energy storage on account of their excellent electrochemical activity and reversibility. Herein, 2-amino-3-chloro-1,4-naphthoquinone (2-NTQ) is covalently connected to the reduced graphene oxide (RGO) to obtain a new all?carbon electrode material (2-NTQ-RGO). The 2-NTQ-RGO composite exhibits excellent capacitance performance by incorporating the merits of the 2-NTQ molecules and RGO. The optimized 2-NTQ-RGO possesses a high specific capacitance of 453 F g?1 at 1 A g?1 and displays good cycle stability (83% of the initial after 8000 cycles) in 1 M H2SO4 electrolyte. Moreover, two asymmetric supercapacitors are assembled for the purpose of investigating the influence of the electrode materials matching on the performance of the capacitor. With the same positive material, the 2-NTQ-RGO//DQ-RGO can achieve an energy density of 23.4 Wh kg?1 and a power density of 900 W kg?1. Two ASC devices in series can light up in the shape of a “butterfly” consisting of 71 light-emitting diodes (LEDs). In contrast, the energy density of the 2-NTQ-RGO//AC is only 16.7 Wh kg?1 (812 W kg?1). The covalent grafting offers a new promising and effective method for the preparation of green all?carbon energy storage materials.
      原文链接:
    • NSTL
    • Elsevier

    Fabrication and investigation of ZnO-CNT@Fe3O4/NF as supercapacitor electrode by using a novel preparation method of CNT

    Tourchi Moghadam M.T.Seifi M.
    9页
    查看更多>>摘要：? 2022 Elsevier B.V.This work used facile and novel methods to synthesize and fabricate ZnO-CNT@Fe3O4/NF as a supercapacitor electrode. The synthesis of active material and fabrication of electrodes performed by chemical vapor deposition (CVD) and Hydrothermal method. The carbon nanotube (CNT) was modified under the influence of nitrogen molecules in hot conditions using the CVD method. Through this method, the nitrogen molecules from the ammonia solution were deposited on CNT using a bubbler and maintained in the CVD apparatus under 700 °C heat conditions. To synthesize the active material, the modified CNT was decorated with Fe3O4 nanoparticles and composited with ZnO then the active material was coated on Ni Foam Through the hydrothermal method. To find the structure and morphology of the sample, the physical characterization was performed by Raman, XRD, SEM, EDX, TEM, and BET. The electrochemical properties of the electrodes were investigated by cyclic voltammetry (CV), galvanostatic charge-discharge analysis (GCD), and electrochemical impedance spectroscopy (EIS). The results showed that the ZnO-CNT@Fe3O4/Ni presented a specific capacitance of 532 F·g?1 at a scan rate of 10 mV·s?1 and excellent cycling stability of 88% capacitance retention during 3000 GCD cycles at 8 A·g?1.
      原文链接:
    • NSTL
    • Elsevier

    Structure, mechanical properties and tribological behavior of sp2-C:Ti/sp3-C:Ti multilayer films deposited by magnetron sputtering

    Liu D.Zhang P.Meng L.Ruan C....
    9页
    查看更多>>摘要：? 2022 Elsevier B.V.Amorphous carbon (a-C), one of the most studied carbon-based films, has been widely applied in the filed of artificial joints due to its excellent mechanical and tribological properties and high corrosion resistance. However, low adhesive strength and poor fatigue resistance are fatal shortcomings of this kind of films. In this study, carbon (sp2-C:Ti/sp3-C:Ti) nano-multilayer films (MFs) with sequential sp3-rich and sp2-rich layers were deposited on Ti6Al4V and c-Si substrate by DC magnetron sputtering. X-ray diffraction, scanning electron microscopy, the X-ray photoelectron spectroscopy and the transmission electron microscopy were used to characterize the composition, structure and morphologies of the MFs. In the sp2-C:Ti/sp3-C:Ti MFs, the sp3-C rich layer and the sp2-C rich layer exhibit amorphous features and onion-like structure, respectively. Moreover, the layered structure is continuous in a relatively clear region but with a rough layer interface. The mechanical and the scratch behaviors were elaborately characterized by nanoindentation and scratch tests. The results revealed that the sp2-C:Ti/sp3-C:Ti MFs possess hardness of 21.9 GPa and excellent scratch behavior at sputtering bias voltage ?220 V, which are significantly better than single-layer films. Furthermore, the adhesion and tribological behaviors of the sp2-C:Ti/sp3-C:Ti MFs were obtained by Rockwell and ball-on-disk tribometer tests. It was found that the sp2-C:Ti/sp3-C:Ti MFs synthesized under a sputtering bias of ?220 V not only exhibit relatively low coefficient of friction (only 0.11) in humid air, but also present lower coefficient of friction (0.085) and wear rate (7.5 × 10?17m3N?1 m?1) of Si3N4 balls in Fetal bovine serum (FBS) solution. In conclusion, the critical loads and wear resistance of the sp2-C:Ti/sp3-C:Ti-MFs were effected by the sputtering bias and the mechanical properties of the MFs. And when sputtering bias is ?220 V, the sp2-C:Ti/sp3-C:Ti MFs exhibited the improved mechanical properties, the lowest coefficient of friction (CoF) and the highest wear resistance.
      原文链接:
    • NSTL
    • Elsevier

    Highly phosphorus-doped polycrystalline diamond growth and properties

    Weiss Z.Klimsa L.Kopecek J.Mortet V....
    6页
    查看更多>>摘要：? 2022 Elsevier B.V.In this work, phosphorus-doped polycrystalline diamond layers were grown using a new gas control process to increase the incorporation of phosphorus in diamond. Topographical characteristics and crystalline quality of the phosphorus-doped polycrystalline diamond layers grown on Si substrates were analyzed using Scanning Electron Microscopy (SEM) and Raman spectroscopy. The phosphorus concentration was determined using Glow-Discharge Optical Emission Spectroscopy (GDOES). Polycrystalline diamond layers have a good crystalline quality with a sp3/sp2 carbon ration over 75%. The growth rate reaches up to 440 nm?h?1, and the phosphorus concentration is well above 1020 cm?3. Novelty statement: This work reports on a new method for the production of phosphorus-doped polycrystalline diamond layers based on the pulsed injection of methane during the growth by microwave plasma enhanced chemical vapor deposition.
      原文链接:
    • NSTL
    • Elsevier

    Preparation of rGO/Ni2ZnS4 and high-performance asymmetric supercapacitors with GO/ZIF-8 template

    Zhao C.Zhao L.Yu H.Wang J....
    11页
    查看更多>>摘要：? 2022 Elsevier B.V.Graphene oxide (GO) was used as a substrate, and ZIF-8 was grown in situ on the GO surface and used as a template. The rGO/Ni2ZnS4 composite was prepared by nickel nitrate etching, carbonization, and hydrothermal vulcanization. X-ray diffraction (XRD), scanning electron microscope (SEM), and X-ray photoelectron spectroscopy (XPS) were used to characterize the structure and morphology of the composite material. Then the rGO/Ni2ZnS4 composite material was made into a cathode material, and its electrochemical performance was tested. The test results showed that the specific capacitance value of the rGO/Ni2ZnS4-1.5h electrode material was as high as 1150 F·g?1 at a current density of 1 A·g?1, when the current density reaches 10 A·g?1, the rate performance is 63.3%. After 2000 cycles at a current density of 10 A·g?1, the capacitance retention rate is 59.7%. In addition, an asymmetric capacitor composed of AC//rGO/Ni2ZnS4-1.5h has an energy density of 31.06 Wh·kg?1, when the power density is 750.44 W·kg?1. When the high power density is 7489.18 W·kg?1, the energy density remains at 12.69 Wh·kg?1.
      原文链接:
    • NSTL
    • Elsevier

    Effect of chemical activators on polyphosphazene-based hierarchical porous carbons and their good CO2 capture

    Wang M.Xu Z.Du H.Wang S....
    8页
    查看更多>>摘要：? 2022 Elsevier B.V.In this paper, various hierarchically porous carbons have been prepared from polyphosphazene microspheres by using different activating agents (K2CO3, KOH, or NaOH) and the effects of chemical activators on morphology, pore structure, element component and CO2 uptakes of porous carbons were investigated. With different activators, the resultant porous carbons exhibit different morphology, specific surface area, and pore size distribution (PSD). Among them, the typical sample HPCs - K2CO3 has the largest values of SBET (1681 m2 g?1), Smicro (996 m2 g?1), and Vmicro (0.46 cm3 g?1). Then, using them as sorbents for CO2 capture, their CO2 uptake capability, isosteric heat (Qst), selectivity, and reversibility were investigated and compared. Among them, HPCs - K2CO3 shows the highest uptakes of 6.4 mmol g?1 (282 mg g?1) at 273 K/1 bar and 4.3 mmol g?1 (188 mg g?1) at 298 K/1 bar. Based on the linear fitting method, this high CO2 uptake could be mainly attributed to the large micropore volume of sorbents, and also has the contribution of multiple heteroatoms in the porous carbon matrix. Furthermore, all the prepared porous carbon samples exhibit low isosteric heat (Qst) (21.24–22.13 kJ mol?1) with high CO2 uptake (4.53–6.41 mmol g?1 at 273 K), high selectivity of CO2/N2 (IAST selectivity of HPCs – K2CO3: 450 at 273 K, 160 at 298 K), and good recyclability, and the regeneration of them is easy to achieve.
      原文链接:
    • NSTL
    • Elsevier

    The size effect of faceted detonation nanodiamond particles on electrorheological behavior of suspensions in mineral oil

    Vdovichenko A.Y.Kuznetsov N.M.Bakirov A.V.Belousov S.I....
    9页
    查看更多>>摘要：? 2022 Elsevier B.V.Suspensions of hydrogenated detonation nanodiamond (DND) particles in mineral oil are electrorheological fluids: their viscosity and yield stress increase under an electric field. The effect of the initial DND particles size obtained during the explosion on the properties of low-filled (up to 4 wt%) electrorheological fluids was considered. The small-angle X-ray scattering method revealed the differences in the structural organization of DNDs with sizes of 3 and 5 nm in a mineral oil, which affects the sedimentation stability of suspensions and their electrorheological behavior. The sedimentation ratio and the values of the yield stress are lower for 3 nm particles suspensions in the whole studied electric field strength (0–6 kV/mm). The method of impedance dielectric spectroscopy showed the differences in the electrophysical characteristics of suspensions filled with particles of 3 and 5 nm. The activation energies of polarization processes were estimated from the temperature dependences of the dielectric loss modulus. The study shows the key role of filler size for creating high performance electrosensitive materials and hypothesizes the reasons for different properties of electrorheological fluids filled by 3 and 5 nm DND particles.
      原文链接:
    • NSTL
    • Elsevier

    High-performance anti-corrosive coatings based on rGO-SiO2-TiO2 ternary heterojunction nanocomposites for superior protection for mild steel specimens

    Steffi A.P.Chandrasekar N.Prakash N.Balaji R....
    17页
    查看更多>>摘要：? 2022 Elsevier B.V.Corrosion is the impairment of metal which typically generates the oxides of the original metal and results in a destruction of the surface and loss of mechanical properties like strength, ductility, impact strength so it is considered to be a serious issue. To regulate this, we have synthesized an anticorrosive ternary nanocomposite coating. We have prepared (GO/rGO-SiO2-TiO2) binary and ternary nanocomposite coating with incorporation of organic resin (Cashewnut resin). GO was derived from graphite powder by hummers method whereas rGO was obtained by the reduction process of GO. SiO2 and TiO2 were prepared by wet chemical process. The nanoparticles were subjected for its size, structural and morphological characterization. The nanoparticles are mixed with natural resin for building up of nanocomposites coating. The composite mixture was deposited on the mild steel panel and the coated panels were subjected to contact angle analysis, salt spray testing and electrochemical studies to analyse the hydrophobic, roughness, corrosion resistivity etc. The ternary composite coating rGO/SiO2/TiO2 shows high performance of corrosion resistivity, the corrosion rate obtained from anticorrosion study is 0.0187 mm/year after 152 h of immersion in aggressive saline environment, thus the nanocomposites coating exhibits high anticorrosion activity.
      原文链接:
    • NSTL
    • Elsevier

    Microstructure and properties at bonds of diamond grains and Ni–Cr filler alloy by fiber laser brazing

    Zhang M.Li X.Mao C.Hu Y....
    8页
    查看更多>>摘要：? 2022Advanced laser technology has been used in laser brazing to bond diamond grains in metal matrix to achieve some distinctive advantages such as high protrusion heights and large gaps of diamond grains. However, laser brazing has not been widely adopted as expected to produce various diamond tools since that bonding mechanisms, microstructures and characteristics of bonded interfaces have not fully investigated. In this paper, the experimental study was performed for using fiber laser brazing to bond diamond grains on steel substrate with Ni–Cr filler alloy. Microstructures, graphitization, and shear force at the bonded interface were especially analyzed. The experiments led to the following outcomes: (1) the interface of diamond grains and Ni–Cr alloy was a wavy surface with an average thickness of 7 μm. (2) Two types of carbide, i.e., Cr3C2 and Cr7C3, were generated on the brazed surface; Cr3C2 was lath-shaped and generated at first, and Cr7C3 was prismatic and built upon Cr3C2. (3) The interface of diamond grains and Ni–Cr alloy was rough and accompanied by graphitization. (4) The shearing test showed that an average force of 138 N was applied to debone single diamond grain from filler metal.
      原文链接:
    • NSTL
    • Elsevier

    A dual-functional micro-focus X-ray source based on carbon nanotube field emission

    Huang W.Huang Y.Liu R.Zhu W....
    7页
    查看更多>>摘要：? 2022 Elsevier B.V.A micro-focus X-ray source with miniature pressure sensor was developed based on the multi-walled carbon nanotube (MWNT) field emission. The field emitters for both X-ray cathode and the pressure sensor were synthesized by direct chemical vapor deposition growth of MWNTs on catalytic substrates. MWNTs exhibited excellent field emission properties with the threshold field at 10 mA/cm2 of 2.30 V/μm, and the high current density of 10 A/cm2 could be reached at the field of 4.36 V/μm. The field emission electron gun was constructed with the aid of electrostatic simulations on the electron beam trajectories and the focal spot size (FSS) on the target with the demagnification factor of 5. The practical objects, including the semiconductor chip and the ceramic heating element, were tested by the X-ray source with the spatial resolution of less than 35 μm, and the fracture of the ceramic element inside metal case could be clearly detected. The pressure sensor monitored the in-situ pressures inside the source during the processing and after the sealing-off. The pressures in the sealed sources were generally in 10?4 Pa level and could rise to 10?2 Pa level during the operation.
      原文链接:
    • NSTL
    • Elsevier