Effect of catalyst film thickness on the structures of vertically-oriented few-layer graphene grown by PECVD

Qi, Jingyao; Zhang, Fu; Wang, Xu; Zhang, Li Xia; Cao, Jian; Feng, Ji

doi:10.1039/c4ra08109a

Cited by 10 publications

(4 citation statements)

References 49 publications

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“…The selected area electron diffraction (SAED) pattern of Co@PCNS (Figure 4d, inset) can be indexed to (111) and ( 200) planes of fcc-Co and the (002) plane of disordered carbon. 45 The HRTEM image (Figure 4d) shows the single crystalline nature of Co with an interplanar spacing of 0.20 nm. Contact mode AFM images (Figure 4e,f) proved that individual Co nanoparticles are strongly anchored on carbon nanosheets.…”

Section: Resultsmentioning

confidence: 99%

“…Average size of Co nanoparticles (25 ± 5 nm) measured from TEM images is in good agreement with SEM and XRD results. The selected area electron diffraction (SAED) pattern of Co@PCNS (Figure d, inset) can be indexed to (111) and (200) planes of fcc-Co and the (002) plane of disordered carbon . The HRTEM image (Figure d) shows the single crystalline nature of Co with an interplanar spacing of 0.20 nm.…”

Section: Resultsmentioning

confidence: 99%

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Cobalt Nanoparticles Chemically Bonded to Porous Carbon Nanosheets: A Stable High-Capacity Anode for Fast-Charging Lithium-Ion Batteries

Etacheri

Hong

Tang

et al. 2018

ACS Appl. Mater. Interfaces

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A two-dimensional electrode architecture of ∼25 nm sized Co nanoparticles chemically bonded to ∼100 nm thick amorphous porous carbon nanosheets (Co@PCNS) through interfacial Co-C bonds is reported for the first time. This unique 2D hybrid architecture incorporating multiple Li-ion storage mechanisms exhibited outstanding specific capacity, rate performance, and cycling stabilities compared to nanostructured CoO electrodes and Co-based composites reported earlier. A high discharge capacity of 900 mAh/g is achieved at a charge-discharge rate of 0.1C (50 mA/g). Even at high rates of 8C (4 A/g) and 16C (8 A/g), Co@PCNS demonstrated specific capacities of 620 and 510 mAh/g, respectively. Integrity of interfacial Co-C bonds, Co nanoparticles, and 90% of the initial capacity are preserved after 1000 charge-discharge cycles. Implementation of Co nanoparticles instead of CoO restricted LiO formation during the charge-discharge process. In situ formed Co-C bonds during the pyrolysis steps improve interfacial charge transfer, and eliminate particle agglomeration, identified as the key factors responsible for the exceptional electrochemical performance of Co@PCNS. Moreover, the nanoporous microstructure and 2D morphology of carbon nanosheets facilitate superior contact with the electrolyte solution and improved strain relaxation. This study summarizes design principles for fabricating high-performance transition-metal-based Li-ion battery hybrid anodes.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Cobalt Nanoparticles Chemically Bonded to Porous Carbon Nanosheets: A Stable High-Capacity Anode for Fast-Charging Lithium-Ion Batteries

Etacheri

Hong

Tang

et al. 2018

ACS Appl. Mater. Interfaces

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“…Further, as shown in figure 2(c), it can be clearly observed that the top of the obtained CNTs are uniformly coated with 'petal-like' graphene sheets (GSs). As in our previous study [26], the structure is a typical GS/CNT composite which can be directly obtained on a Co/Si substrate using PECVD. When the substrate changed to Co/SiO 2 /Si, the obtained CoO film has small cracks on the surface of the SiO 2 /Si substrate after annealing, as shown in figure 2(d).…”

Section: Resultsmentioning

confidence: 99%

Confirming the key role of Ar⁺ ion bombardment in the growth feature of nanostructured carbon materials by PECVD

Liu¹,

Lin²,

Jia³

et al. 2017

Nanotechnology

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In order to confirm the key role of Ar ion bombardment in the growth feature of nanostructured carbon materials (NCMs), here we report a novel strategy to create different Ar ion states in situ in plasma enhanced chemical vapor deposition (PECVD) by separating catalyst film from the substrate. Different bombardment environments on either side of the catalyst film were created simultaneously to achieve multi-layered structural NCMs. Results showed that Ar ion bombardment is crucial and complex for the growth of NCMs. Firstly, Ar ion bombardment has both positive and negative effects on carbon nanotubes (CNTs). On one hand, Ar ions can break up the graphic structure of CNTs and suppress thin CNT nucleation and growth. On the other hand, Ar ion bombardment can remove redundant carbon layers on the surface of large catalyst particles which is essential for thick CNTs. As a result, the diameter of the CNTs depends on the Ar ion state. As for vertically oriented few-layer graphene (VFG), Ar ions are essential and can even convert the CNTs into VFG. Therefore, by combining with the catalyst separation method, specific or multi-layered structural NCMs can be obtained by PECVD only by changing the intensity of Ar ion bombardment, and these special NCMs are promising in many fields.

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“…Previous reports have indicated that the in situ growth of VFG by PECVD can be divided into two steps. In-plane graphene first grows on the substrate, and then vertically oriented graphene preferentially nucleates and grows upwards from the defects and boundaries of the in-plane graphene [27][28][29][30][31]. Thus, VFG-Cu is thought to be formed from a layer of vertically oriented graphene on top of the GS-Cu.…”

Section: Microstructure Of Gs and Vfgmentioning

confidence: 99%

In Situ Grown Vertically Oriented Graphene Coating on Copper by Plasma-Enhanced CVD to Form Superhydrophobic Surface and Effectively Protect Corrosion

et al. 2022

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Graphene exhibits great potential for the corrosion protection of metals, because of its low permeability and high chemical stability. To enhance the anticorrosion ability of Cu, we use plasma-enhanced chemical vapor deposition (PECVD) to prepare a vertically oriented few-layer graphene (VFG) coating on the surface of Cu. The Cu coated with VFG shows superhydrophobic surface with a contact angle of ~150°. The VFG coating is used to significantly increase the anticorrosion ability, enhanced by the chemical stability and the unique geometric structure of vertically oriented graphene. The corrosion rate of VFG-Cu was about two orders of magnitude lower than that of bare Cu. This work highlights the special synthesized way of PECVD and superhydrophobic surface of vertical structures of graphene as coatings for various applications.

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Effect of catalyst film thickness on the structures of vertically-oriented few-layer graphene grown by PECVD

Cited by 10 publications

References 49 publications

Cobalt Nanoparticles Chemically Bonded to Porous Carbon Nanosheets: A Stable High-Capacity Anode for Fast-Charging Lithium-Ion Batteries

Cobalt Nanoparticles Chemically Bonded to Porous Carbon Nanosheets: A Stable High-Capacity Anode for Fast-Charging Lithium-Ion Batteries

Confirming the key role of Ar⁺ ion bombardment in the growth feature of nanostructured carbon materials by PECVD

In Situ Grown Vertically Oriented Graphene Coating on Copper by Plasma-Enhanced CVD to Form Superhydrophobic Surface and Effectively Protect Corrosion

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Effect of catalyst film thickness on the structures of vertically-oriented few-layer graphene grown by PECVD

Cited by 10 publications

References 49 publications

Cobalt Nanoparticles Chemically Bonded to Porous Carbon Nanosheets: A Stable High-Capacity Anode for Fast-Charging Lithium-Ion Batteries

Cobalt Nanoparticles Chemically Bonded to Porous Carbon Nanosheets: A Stable High-Capacity Anode for Fast-Charging Lithium-Ion Batteries

Confirming the key role of Ar+ ion bombardment in the growth feature of nanostructured carbon materials by PECVD

In Situ Grown Vertically Oriented Graphene Coating on Copper by Plasma-Enhanced CVD to Form Superhydrophobic Surface and Effectively Protect Corrosion

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Confirming the key role of Ar⁺ ion bombardment in the growth feature of nanostructured carbon materials by PECVD