Substrate	specification	price	Square resistance (Ω/□)
SiO2/Si-based double-layer graphene	1cm*1cm	Inquiry	300-500
SiO2/Si-based double-layer graphene	2cm*2cm	Inquiry	300-500
SiO2/Si-based double-layer graphene	5cm*5cm	Inquiry	300-500
SiO2/Si-based double-layer graphene	Other size	Inquiry	300-500

  Copper-based graphene transfer technical parameters

Schematic diagram of copper-based graphene transfer process:

Graphene characterization data:

SEM:

SIO2/SI-based graphene photo:

Optical microscope photo:

High resolution transmission electron microscope photo:

High electron mobility of graphene film tested by photolithography (EBL engraved electrode will be higher):

Raman spectroscopy data:

Single layer graphene Raman spectroscopy

Double layer graphene Raman spectroscopy

Three-layer graphene Raman spectroscopy