Graphene Platelet (GPL)/Nickel (Ni) Laminate Coatings for Improved Surface Properties

Li, Meng; Liu, Jian; Zhu, Xiaoping; Zhou, Cunlong; Munagala, Sai Priya; Tian, Yaqin; Ren, Jie; Jiang, Kyle

doi:10.1002/adem.201600795

Cited by 7 publications

(6 citation statements)

References 19 publications

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“…Figure 3b-d show typical SEM and highermagnification SEM images, respectively, demonstrating the presence of curved and extended ultra- Figure 3a shows the cross sectional microstructure of raw graphite strips, indicating a layered structure consisting of quantities of graphitic layers. Figure 3b-d show typical SEM and higher-magnification SEM images, respectively, demonstrating the presence of curved and extended ultra-thin carbon films which is the typical morphology of graphene [28,[53][54][55]. The curved structure is owing to thermodynamically instability of the two dimensional materials [56].…”

Section: Resultsmentioning

confidence: 96%

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High-Efficiency Production of Large-Size Few-Layer Graphene Platelets via Pulsed Discharge of Graphite Strips

et al. 2019

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The synthesis of large-size graphene materials is still a central focus of research into additional potential applications in various areas. In this study, large-size graphene platelets were successfully produced by pulsed discharge of loose graphite strips with a dimension of 2 mm × 0.5 mm × 80 mm in distilled water. The graphite strips were made by pressing and cutting well-oriented expanded graphite paper. The recovered samples were characterized by various techniques, including TEM, SEM, optical microscopy (OM), atomic force microscopy (AFM), XRD and Raman spectroscopy. Highly crystalline graphene platelets with a lateral dimension of 100–200 μm were identified. The high yield of recovered graphene platelets is in a range of 90–95%. The results also indicate that increasing charging voltage improves the yield of graphene platelets and decreases the number of graphitic layers in produced graphene platelets. The formation mechanism of graphene platelets was discussed. This study provides a one-step cost-effective route to prepare highly crystalline graphene platelets with a sub-millimeter lateral size.

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Section: Resultsmentioning

confidence: 96%

“…Nanomaterials 2012, 9, x FOR PEER REVIEW 5 of 12 thin carbon films which is the typical morphology of graphene [28,[53][54][55]. The curved structure is owing to thermodynamically instability of the two dimensional materials [56].…”

Section: Resultsmentioning

confidence: 99%

High-Efficiency Production of Large-Size Few-Layer Graphene Platelets via Pulsed Discharge of Graphite Strips

et al. 2019

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“…The representative SEM images ( Figure 3 ) of the FLG synthesized through the shock loading process indicate that the samples possess a typical micromorphology of 2D materials and curved and extended ultra-thin nanosheets [ 41 , 44 , 54 ] due to their thermodynamic instability [ 55 ]. Moreover, the formed graphene nanosheets agglomerate to form a 3D-porous-like structure, implying the thermodynamic instability of 2D materials.…”

Section: Resultsmentioning

confidence: 99%

Synthesis of N-Doped Few-Layer Graphene through Shock-Induced Carbon Fixation from CO2

Yin

Gao

et al. 2022

Nanomaterials

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In this study, graphene and N-doped graphene nanosheets were synthesized through the shock-induced reduction of CO2 using a cylindrical shock-loading apparatus. The mixture of solid CO2 and Mg powder was filled in the pre-cooled sample tube and then impacted by a shock-driven cylindrical flyer tube. The impact generated a shockwave that propagated into the mixed precursor, inducing a chemical reaction between CO2 and Mg at a high shock pressure and high shock temperature. The recovered black powders were characterized via various techniques, confirming the presences of few-layer graphene. The mechanism is carefully shown to be that CO2 was reduced by Mg to form few-layer graphene under shock-induced high pressure and high temperature. By adding carbamide as an N source, this synthetic route was also applied to synthesize N-doped graphene nanosheets. Moreover, the yield and mass of the graphene materials in this study are up to 40% and 0.5 g, respectively. This study showed an efficient and easy-to-scale-up route to prepare few-layer graphene and N-doped few-layer graphene through shock synthesis.

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“…GPLs [36,39] were from Nanjing XFNANO Materials Tech Co. Ltd. The average size of platelets is 0.5-2 μm and with thickness of 0.8-1.2 nm.…”

Section: Electrodeposition and Heat Treatmentmentioning

confidence: 99%

Investigation of the corrosion resistance of graphene-nickel composite micro-parts

Suo

Wang

et al. 2022

Mater. Res. Express

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Nickel-based microparts possess a short lifetime owing to their rapid dissolution in corrosive environments. To mitigate this phenomenon, composite microparts of graphene/Ni were prepared using UV-LIGA technology; their corrosion behavior was examined in acid, alkali, and salt solutions as well as after subjecting them to heat-treatment processes. The microstructures were investigated with scanning electron microscopy (SEM), X-ray diffraction (XRD), electron backscatter diffraction (EBSD) and transmission electron microscopy (TEM). Corrosion resistances were characterized through various electrochemical tests and compared with those of pure Ni microparts. The results demonstrate that the surface oxidation layer (i.e.,the protective layer) of the microparts was readily destroyed in NaCl and H2SO4 solutions without the formation of a passivation film; however, a passivation film was formed in the NaOH solution. The corrosion rates of graphene/Ni in NaCl, NaOH, and H2SO4 corrosion solutions were reduced by 73%, 22%, and 84%, respectively, relative to those of pure Ni microparts. This can be primarily attributed to the homogeneous dispersion of graphene in the Ni matrix, which refined the grain size, and the impermeability and chemical stability of graphene, which lengthened the diffusion path of the corrosive medium. In addition, heat treatment of the graphene/Ni microparts at 200 °C increased the corrosion resistance by a factor of nearly one with little change in microhardness, which can be attributed to the removal of internal stress and the increased proportion of CSL grain boundares. Corrosion occurred at the interface between nickel and graphene, lengthening the corrosion path.

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Graphene Platelet (GPL)/Nickel (Ni) Laminate Coatings for Improved Surface Properties

Cited by 7 publications

References 19 publications

High-Efficiency Production of Large-Size Few-Layer Graphene Platelets via Pulsed Discharge of Graphite Strips

High-Efficiency Production of Large-Size Few-Layer Graphene Platelets via Pulsed Discharge of Graphite Strips

Synthesis of N-Doped Few-Layer Graphene through Shock-Induced Carbon Fixation from CO2

Investigation of the corrosion resistance of graphene-nickel composite micro-parts

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