Currently, the smallest size we offer [TCVD Graphene on Cu foil] is 50x50mm while the larger size offered is 80x80mm.

If you are in need of smaller sizes then what we offer, we suggest that you purchase a 50x50mm and cut into required sizes. 

If you need sizes larger then 80x80mm, then you can send and email to below email address.

info@graphenesq.com

It may be possible to purchase graphene on Cu foil and do the transfer process even as a beginner, 

however, there may be multiple trial and error processes. 

As a result, we would suggest purchasing our graphene transferred on substrates or

if you are in need of our graphene transfer service, we can provide such service customers’ substrate as well.

As you may know, graphene can be acquired in two methods. 

1) Top down: mechanically exfoliating carbon from graphite to make graphene powder or graphene oxide,

2) Bottom up: since carbon is composed of gas (ex. CH4, C2H4,,,) graphene film can be synthesized at high temperature through the CVD method. 

One of the options can be considered depending on the research goals.

Due to graphene’s characteristics, the theoretical prices and actual sample prices can vary and the characteristics of graphene powder and graphene film differ as well. 

As a result, when mixing graphene with other materials, graphene powder may be more appropriate. 

You would have to perform tests to find the right mixture ratios, 

but generally, mixing graphene powder with other materials to further manufacture products using molds or presses are possible.

1) Graphene synthesis process by Thermal CVD equipment

2) PMMA coating
3) Back side etching  (using RIE)

4) Cu foil etching using APS solution

5) Rinse using DIW water

6) Transfer onto substrate, dry by baking on hot plate

7) Remove PMMA by dipping in Acetone

8) Quality check (Optical microscope, Raman spectroscope)

9) Vacuum package, shipping

For multiple layers, we use graphene on Cu foil to initiate and perform overlapping process.

The basic process is as follows: take [Graphene/Cu foil] and scoop from underneath [PMMA/Graphene] using DI water bath resulting in [PMMA/Graphene/Graphene/Cu foil]. 

Afterwards, Cu foil can be etched away and the above process can be repeated to make multiple layers of graphene.

For dry transfer, there are two main options: 1) Thermal release tape [TRT], 2) Pressure Sensitive Adhesive Film [PSAF]. 

The common requirement is that both methods require pressure using a laminator.

1) TRT: apply TRT with level pressure and temperature (100~110℃) simultaneously so that graphene can be released from the base surface of TRT onto the target substrate [based upon long period of experience and know-how, TRT is the suggested option versus PSAF].

2) PSAF: apply PSAF with level pressure from the base surface of PSAF onto the target substrate.