if yes then what is the changes in its property? or its remain unchanged.
I am interested in what other members of the RG community have to say, but here is my take.
Graphene by definition is a single-atom two-dimensional lattice. Therefore, to achieve 2 micron of thickness you would have to fabricate a stack of graphene layers. Adding layers is likely to lead to the incorporation of more and more defects- altering the behaviour. Materials at the nanoscale often behave differently than their bulk counterparts. This transition is a grey area and can be complicated by geometry dependence.
In my opinion the literature is a minefield, full of drastically varying results, particularly when coupled with other aspects such as biointeractions. Measured values (even for simple properties such as sheet conductivity) can sometimes be several orders of magnitude apart. In these cases, are we really measuring the same material? Clearly the quality and reproducibility of the fabricated material is a challenge. Therefore, I would imagine that moving towards very thick stacks of graphene would only present more issues.
Article Graphene-Based Materials and their Composites: A Review on P...
Article Graphene: A Comprehensive Review
Article Structure of graphene and its disorders: a review
No size specific growth of graphene is not possible...
The precursor for this is reduced graphene oxide.
When u optimise the temperature conditions, even less than 2 micrometer thickness could be grown.
But can be achieved by investigating through trial and error method.
Fix the temperature from 600 deg centigrade. Strictly incraese 25deg in step wise for incrementing the thickness.
To call it "graphene" one must have carbon layers not exceeding 10 as per recent Intentional Standerd defination of graphene ( ISO/TS 80004-13:2017) . After 10 layers the word "graphite" is added with the type of structure formed such as platelates, flakes, sheets etc. as the electrical properties are not distinct from the bulk graphite. 2 micron thick sp2 carbon layers are called graphite. Chemical or Mechanical exfoliation of bulk graphite is a possible way to get required thickness of graphite. Apart from this, there are many ways to graphitization of various carbon sources (some are mentioned in following report).
As graphene and graphite are different in terms of chemical, thermal and electrical properties, required properties of carbon layers in a particular application would also decide, whether graphene or graphite should be used.
https://www.nature.com/articles/srep43756 or
Article Transfer free graphene growth on SiO2 substrate at 250 °C
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