The quality studies of vertical graphene nanosheets catalyst-free microwave plasma-enhanced chemical vapor deposited on glass and fused silica

Vertical graphene nanosheets (VGN) were prepared by a microwave plasma-enhanced chemical vapor deposition technique on glass and fused silica. Their quality was explored by Raman scattering spectroscopy and transient absorption spectroscopy (TAS). We have observed a correlation between Raman scattering spectroscopy data and TAS parameters (charge carrier relaxation times and relative transient absorption signal amplitude). The substrate-related effects were explained by competition between the changes in the size of the effects induced by the graphene nanocrystallite, the substrate-induced graphene self-doping, and the presence of on-site and vacancy defects along with the dominant boundary defects. The optical and electrical properties of VGN on glass deposited at low substrate temperature (600 degrees C) were similar or even better compared to VGN on fused silica. The ability to prepare high-quality VGN on glass could be very attractive for practical application due to the low substrate price.

Automated summary

Vertical graphene nanosheets (VGN) were prepared using a microwave plasma-enhanced chemical vapor deposition technique on glass and fused silica. The quality of VGN was explored through Raman scattering spectroscopy and transient absorption spectroscopy (TAS), showing a correlation between Raman scattering spectroscopy data and TAS parameters. The ability to prepare high-quality VGN on glass at low substrate price makes it attractive for practical applications.