PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
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2024
·Vol. 121
·期 9
·e2316580121
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IF 9.4
Xigui Yang,Jinhao Zang,Xingju Zhao,Xiaoyan Ren,Shuailing Ma,Zhuangfei Zhang,Yuewen Zhang,Xing Li,Shaobo Cheng,Shunfang Li,Bingbing Liu,Chongxin Shan
Achieving high-performance materials with superior mechanical properties and electrical conductivity, especially in large-sized bulk forms, has always been the goal. However, it remains a grand challenge due to the inherent trade-off between these properties. Herein, by employing nanodiamonds as precursors, centimeter-sized diamond/graphene composites were synthesized under moderate pressure and temperature conditions (12 GPa and 1,300 to 1,500 °C), and the composites consisted of ultrafine diamond grains and few-layer graphene domains interconnected through covalently bonded interfaces. The composites exhibit a remarkable electrical conductivity of 2.0 × 104 S m−1 at room temperature, a Vickers hardness of up to ~55.8 GPa, and a toughness of 10.8 to 19.8 MPa m1/2. Theoretical calculations indicate that the transformation energy barrier for the graphitization of diamond surface is lower than that for diamond growth directly from conventional sp2 carbon materials, allowing the synthesis of such diamond composites under mild conditions. The above results pave the way for realizing large-sized diamond-based materials with ultrahigh electrical conductivity and superior mechanical properties simultaneously under moderate synthesis conditions, which will facilitate their large-scale applications in a variety of fields.
研究领域:
材料科学
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物理学
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DOI
PubMed
高影响因子
DIAMOND AND RELATED MATERIALS
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2024
·
IF 4.3
Biao Yan,Zhixin Zhao,Xiaojuan Wu,Haoran Li,Duo Liu
Diamond shows great potentials as an ultimate material candidate for application in microelectromechanical systems (MEMS). In this work, we report microcontact printing (μCP) transfer as a facile technique to fabricate diamond MEMS cantilever arrays. We started from the Deryaguin–Landau–Verwey–Overbeek (DLVO) principles and formulated a colloidal “ink” that contains nanodiamonds (NDs) seeds well dispersed in polymethyl methacrylate/acetone. The NDs seeds were then transfer printed onto a silicon (100) substrate by using a flexible polydimethylsiloxane (PDMS) stamp with predefined pattern. The densely packed NDs pattern (∼10 9 cm −2 ) enables facile and selected-area growth of diamond with microwave plasma chemical vapor deposition (MPCVD) technique. A diamond film with minimal graphite contaminants and low residual stresses was obtained after growth at 1118 K for 3 h. The diamond cantilevers were released from the substrate by wet chemical etching using KOH (40 % wt.) and isopropyl alcohol (10 % vol.). An examination of the vibrational kinetics indicates that the diamond film has a high Young's modulus (∼795 GPa) and the cantilevers exhibit consistently distributed resonant frequencies and high quality factors in ambient air. The method opens the door for large-scale, cost-effective production of uniform diamond MEMS devices for sensor and quantum applications.
研究领域:
材料科学
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微机电系统
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表面化学
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DOI
高影响因子
Materials
·
2024
·Vol. 17
·期 22
·5593
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IF 3.1
Shuangqing Zhou,Stephan Handschuh-Wang,Tao Wang
The drilling of State-of-the-Art printed circuit boards (PCBs) often leads to shortened tool lifetime and low drilling accuracy due to improved strength of the PCB composites with nanofillers and higher thickness-to-hole diameter ratio. Diamond coatings have been employed to improve the tool lifetime and drilling accuracy, but the coated microdrills are brittle and suffer from coating delamination. To date, it is still difficult to deposit diamonds on ultrathin microdrills with diameters lower than 0.2 mm. To avoid tool failure, the pretreatment was optimized to afford sufficient fracture strength and enough removal of cobalt. Further, the adhesion of the diamond coating was improved by employing an interlayer comprising SiC/microcrystalline diamond, which mitigates stress accumulation at the interface. By these means, microdrills with diameters of 0.8 and 0.125 mm were coated with adherent diamonds. In this context, the composite coating with the diamond/SiC interlayer and a nanodiamond top layer featured enhanced adhesion compared to single nano- or microdiamond coatings on the WC-Co microdrills. The composite diamond-coated WC-Co microdrills featured improved wear resistance, resistance to delamination of the diamond coating, and improved performance for drilling PCBs compared to micro- and nanodiamond-coated microdrills without interlayer. In addition, a higher hole quality was achieved when the diamond-coated microdrills were used. These results signify that the composite/nanodiamond coating features the highest bonding strength and best drilling performance.
研究领域:
材料科学
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机械工程
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DOI
PubMed
高影响因子
ADVANCED FUNCTIONAL MATERIALS
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2024
·
IF 18.5
Peng Huang,Xinchun Chen,Wei Qi,Jisen Tian,Jianxun Xu,Kai Wang,Wenli Deng,Chenhui Zhang,Jianbin Luo
Hydrogenated diamond-like carbon (H-DLC) films are limited by their poor thermal stability, which significantly affects the tribological applications and needs improvement. Accordingly, nanodiamond (ND) and hexagonal boron nitride (h-BN) are used to address this issue. When the H-DLC surface is deposited using ND+h-BN mixture with mass ratio of 1:1 and a concentration of 0.1 mg mL −1 and vacuum-heated at 200 °C and 1 × 10 −5 Pa, a superlow friction coefficient of 0.0015 can be obtained, with a reduction of 98.33% as compared to pure H-DLC. Correspondingly, the wear rates of wear scar and wear track decreased by 81.95% and 24.83%, respectively. High vacuum thermal treatment can purify the adsorbed species on the surfaces of ND and h-BN, and produce newly-exposed dangling bonds. Simultaneously, new bonds of C-N are formed between ND and h-BN, and the nanoparticles adhere together to form a polymer-like structure under friction. Furthermore, the ND can support h-BN and reduce its agglomeration. Under the action of tribochemical reaction, the layer spacing of hexagonal boron nitride is increased to obtain a better shear slip. The combination of these factors resulted in ultra-low friction. This study paved the way for developing functional anti-friction additives for durable and high-performance lubrication.
研究领域:
材料科学
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摩擦学
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DOI
高影响因子
Functional Diamond
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2025
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IF 4
Zhicheng Xing,Stephan Handschuh-Wang,Tao Wang,Peigang Han,Bin He
Several parameters are known to influence the adhesion of diamond coatings to non-diamond substrates. In the current work, we investigate the effect of seeding density on the adhesion of microcrystalline diamond coatings on silicon substrates. To this end, controlled seeding densities on silicon substrates were established by an electrostatic self-assembly seeding strategy. The seeding density was altered by changing the wt% of the ND colloidal seed solution while maintaining the pH and surfactant concentration. This resulted in colloidally stable ND particles with virtually constant hydrodynamic diameter (ca. 30 nm) and Zeta potential (ca. +32 mV) while the wt% of the ND in the colloid was altered between 0.00033 and 0.1 wt%. With these diluted solutions the seeding density was controlled between 4 × 108 cm−2 and 1.95 × 1011 cm−2. Subsequently, microcrystalline diamond coatings with a thickness of 3.1 ± 0.1 µm were grown. The adhesion of the diamond coating to the silicon substrate was evaluated by indentation. Best adhesion was found for a seeding density of 1.81 × 1011 cm−2, featuring no delamination and low sample to sample variation. Counterintuitively, further increase in seeding density resulted in an increase of crack length and sample to sample variation. This decline in adhesion was attributed to ND aggregates formed during the seeding step, which either desorb or form areas with poor diamond-silicon bonding upon diamond growth. Therefore, this result is of import for diamond film adhesion studies and commercial diamond coated cutting tools using high seeding densities being prone to aggregation.
研究领域:
材料科学
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表面工程
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纳米技术
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DOI
高影响因子
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
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2020
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IF 3.407
Zhaoran Chen,Dejiang Ma,Shanmin Wang,Wenhao Dai,Pinwen Zhu,Yiqing Zhu,Baochang Liu
Ti-coated diamond with different particle sizes and proper amounts of cubic boron nitride (cBN) was used to fabricate polycrystalline diamond composite (PDC) with improved wear resistance and thermal stability under high temperature and high pressure (5.5–6.5GPa, 1500–1650 °C). The ratio of Ti-coated diamond powder, cBN powder and normal diamond powder was W 30 – 50 : W 4 – 8 : W 0 – 1 = 70: 15: 15. Cobalt (Co) was used as a binder, and cemented tungsten carbide was used as a substrate to sinter a new high-performance PDC. Ti and TiC on the surface of Ti-coated diamond reacted with cBN under high temperature and high pressure to generate new ceramic phases such as TiB 2 , TiN and TiN 0.3 , which have high hardness and good wear resistance. Compared with the conventional PDC, the impact toughness and wear resistance of PDC with Ti-coated diamond and cBN addition were enhanced by 19% and 28%, respectively. The ceramic phase acts as a protective barrier, which enhances the initial graphitization and oxidizing temperature to 942–950 °C, which were 162–170 °C higher than the conventional PDC. The new ceramic barrier wrapped around the surface of the diamond and Co after the formation of the D-D (diamond-diamond) bonding will give priority to the oxidation reaction of Co and diamond with oxygen, which prohibits cobalt-catalytic graphitization of diamond, meeting the needs of PDC thermal stability and wear resistance in the field of drilling.
研究领域:
材料科学
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地质工程
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产品关联
DOI
高影响因子
Applied Nanoscience
·
2020
·Vol. 11
·期 1
·257-266
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IF 2.88
Qu Jiaying,Mukerabigwi Jean Felix,Yang Nianshun,Huang Xueying,Sun Yuyang,Cai Xiaojuan,Cao Yu
The nanodiamond (ND) particles have several potential applications including tribology, drug delivery, bioimaging, etc. However, the severe colloidal aggregation tendency of ND particles strictly limits its exploitation. Moreover, due to NDs rich surface chemistry and relatively small size, it is still difficult to separate these large ND particles using conventional separation methods. Herein, we develop an efficient and straightforward strategy to separate the colloidal aminated nanodiamonds (ND-NH 2 ) into small size nanoparticles by viscosity gradient centrifugation method in a polyvinylpyrrolidone (PVP) aqueous solution. Prior to and after separation, the pristine ND and ND-NH 2 particles size and morphology were characterized by DLS (dynamic light scattering analyzer) and TEM (transmission electron microscopic), which show that ND particles with narrow size distribution and uniform morphology can be easily separated by the viscosity gradient of PVP aqueous solution. This simple, rapid and effective separation method could be extended to separate other functionalized NDs with different sizes.
研究领域:
材料科学
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纳米技术
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化学工程
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产品关联
DOI
高影响因子
CHEMICAL PHYSICS LETTERS
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2025
·
IF 3.1
Zhicheng Xing,Zongyan Zhang,Tao Wang,Xiaorui Liu,Haojie Xing,Xinqing Gao,Peigang Han,Bin He,Stephan Handschuh-Wang
In this study, nanodiamonds chemically modified with C12 and C18 hydrocarbon chains were studied for their use in Langmuir-Blodgett deposition. The hydrophobic nanodiamonds were spread from dichloromethane (best solvent in this study) and a compression of 30 mN/m was used to transfer the nanoparticles onto the silicon substrate. Heating this substrate to 400 °C indicates that the particles do not desorb or form aggregates. Finally, the seeded substrate was used for diamond growth via hot filament chemical deposition (HFCVD), resulting in growth of a ca. 2.8 ± 0.1 μm thick diamond film without pinholes, illustrating the feasibility of this approach.
研究领域:
材料科学
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表面工程
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纳米技术
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薄膜制备
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化学气相沉积
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产品关联
DOI
高影响因子
CRYSTENGCOMM
·
2019
·Vol. 21
·期 40
·6010-6017
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IF 3.382
Shuai Fang,Hongan Ma,Zhanke Wang,Zhiqiang Yang,Zheng-hao Cai,Luyao Ding,Xinyuan Miao,Liangchao Chen,XiaoPeng Jia
FeS is the main sulfur-containing compound in natural diamond inclusions. The research on FeS-doped diamond crystals plays an extremely important role in exploring the growth environment of natural diamond and the chemical composition of the earth. In our work, the characteristics of FeS doped diamond crystals were studied by using a China-type large volume cubic high-pressure apparatus with an iron–nickel alloy as a catalyst at 6.0 GPa and 1300–1350 °C. The crystals were characterized by OM, SEM, XPS, FTIR and Raman. Scanning electron microscopy of the crystal shows that the {100} plane of the crystal is rougher than {111}, which is related to the number of dangling bonds on different crystal faces of the crystal. The residue on the surface of the crystal was detected by mapping, and the test result showed that it was a sulfur iron and a sulfur nickel compound. FeS will decompose in the synthesis system, and the decomposition products are Fe and S2.The XPS spectrum of the crystal shows that S was successfully incorporated into the diamond lattice by forming C–S–O and C–S–SO2–C bonds, and the peak intensity was strong. The infrared spectrum shows that the N content in the crystal gradually increases as the doping ratio increases. Raman spectroscopy analysis shows that the S-doped Ib-type diamond single crystal has a high-quality sp3 structure, and the full width at half maximum (FWHM) of the crystal gradually broadens as the doping ratio increases.
研究领域:
地球化学
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材料科学
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高压合成
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DOI
高影响因子
ADVANCED MATERIALS
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2025
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IF 26.8
Yue Pan,Xiaohong Yuan,Yong Cheng,Baoyin Xu,Shucheng Liu,Zhitong Wang,Shida Wang,Kuo Hu,Shengcai Zhu,Quanjun Li,Ming-sheng Wang,Zhaodong Liu,Hu Tang,Bingbing Liu
Synthesizing fully sp 3 -bonded non-crystalline carbon remains a long-standing challenge due to the intrinsic instability of the sp 3 bond at ambient pressure. Recently, paracrystalline diamond, a new-form sp 3 -bonded non-crystalline carbon consisting of sub-nanometer-sized paracrystallites, has been synthesized from face-centered cubic C 60 at 30 GPa, which has attracted attention due to its unique structural features and excellent physical properties. However, the ultrahigh synthesis pressure of paracrystalline diamond poses an obstacle to its large-scale production and applications. In this study, paracrystalline diamond is synthesized at an exceptionally low pressure (16 GPa) via inducing uniaxiality at high-pressure and high-temperature conditions, thereby breaking through the temperature-pressure phase diagram of C 60 . By combining structural characteristics and advanced molecular dynamics simulation, the remarkable reduction of synthesis pressure is attributed to the fact that the symmetry of the C 60 cage is broken due to the uniaxiality, which further allows the C 60 cage to collapse at much lower pressures. This work reveals the critical role of uniaxiality in the reduced-pressure synthesis of paracrystalline diamond, which may provide a potent methodological strategy for the development of novel low-cost high-pressure materials.
研究领域:
材料科学
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物理学
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产品关联
DOI
PubMed
高影响因子
DIAMOND AND RELATED MATERIALS
·
2020
·
IF 2.65
Yi Tian,Junpu Wang,Jiawei Zhang,Shixue Guan,Lu Zhang,Binbin Wu,Yuzhu Su,Mengyang Huang,Li Zhou,Duanwei He
The stability and solubility of diamond in cobalt at a pressure of 5 GPa was investigated. At temperatures ranging from 1000 °C and 1350 °C, diamond can be dissolved in cobalt without graphitization . Meanwhile, the solubility of single diamond crystals in cobalt was measured at 5 GPa and temperatures of up to 1300 °C through weight analysis, and it was found to increase with the increase in temperature. The morphological changes of the diamond crystals after high-pressure and high-temperature (HPHT) treatments were observed using a scanning electron microscope . The resulting quantitative data and morphology analysis enabled the construction of a scheme for the morphological evolution of diamond crystals during their dissolution in cobalt at HPHT. The diamond formation process in cobalt solvent is discussed in relation to the dynamic equilibrium.
研究领域:
材料科学
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地质学
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产品关联
DOI
高影响因子
JOURNAL OF ELECTRONIC MATERIALS
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2022
·Vol. 51
·期 12
·6964-6974
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IF 2.047
Geng Zhibin,Liu Hong,Xiong Wei
Polymer/conductor composites are used in energy storage capacitors; however, they exhibit high interface leakage currents, causing low breakdown strength. Here, a ternary-blend strategy was used to synthesize polyvinyl chloride (PVC)/titanium carbide transition-metal carbide two-dimensional nanolayered material (Ti 2 C MXene)/diamond composites using solution casting. The PVC matrix exhibited low polarity and high insulation, while the Ti 2 C MXene and diamond fillers exhibited high conductivities and ultrahigh insulation properties, respectively. Overall, the PVC/Ti 2 C/diamond ternary composites exhibited better electrical properties than the PVC/Ti 2 C binary composites. In the ternary composites, PVC/Ti 2 C interface polarization caused high dielectric constants, while low leakage currents induced by diamond caused low dielectric losses and high breakdown strength. The optimum-composition (12 wt.% Ti 2 C and 4 wt.% diamond) ternary composite exhibited a high dielectric constant (~153 at 100 Hz), low dielectric loss (~0.14 at 100 Hz), low conductivity (~1.4 × 10 −6 S m −1 at 100 Hz), and high breakdown strength (~312 MV m −1 under a direct current field). This study indicates a synergistic effect between Ti 2 C MXene and diamond in the composite dielectrics, and could guide the fabrication of dielectric films for capacitors. Graphical Abstract
研究领域:
材料科学
·
电气工程
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）