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Vertical graphene (VG) was prepared on flat graphene (FG) coated pressed Ni foams by using plasma enhanced chemical vapor deposition. The VG is typical few-layer graphene and is rich in defects. The field emission performance of Ni–FG–VG hybrids with optimal morphology is found to outperform that of VG prepared on pristine Ni foams and Si wafers. It has a low turn-on electric field of 2.03V/μm and...
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