Shiqi Xiao

5 Questions 12 Answers 0 Followers

Questions related from Shiqi Xiao

Why do Cu -Ni alloy foil crimp when heated?

The Cu foil was first electroplated with a layer of Ni, then the alloy foil was annealed in quartz tube under H2/Ar atmosphere at 1040℃ for 2 hours. But when I open the furnace and cool the tube...

04 April 2016 7,330 5 View

Is there another effective way to transfer CVD graphene from copper foil without PMMA supporting?

Usually the as grown graphene film is transfered by PMMA, which act as a sacrifice layer. But I found the PMMA residues were very hard to clean thoroughly. Does anyone have another effective...

01 January 2016 9,906 2 View

How do the holes and cracks in graphene form in the CVD process?

Methane and hydrogen are used to synthesize large single-crystal graphene. Flow rates of are 0.01sccm and 40sccm respectively. The Cu foil is electropolished to flatten the surface before growth.

12 December 2015 775 6 View

Does anyone know the relation between pressure and boundary layer thickness?

I refered two books, but they gave me the different answers. One said the lower the pressure, the thicker the boundary layer. The other said the oppsite result.

08 August 2015 1,007 2 View

Where do the sphere impurities on copper after the growth of graphene come from?

As shown in the attached picture, I found a lot of sphere impurities(100nm) on the surface of the sample. EDS tells the impurities contain Si and O element. Does anyone know how this happens? The...

06 June 2015 2,384 9 View