  We examine the transfer of graphene grown by chemical vapor deposition (CVD)
with polymer scaffolds of poly(methyl methacrylate) (PMMA), poly(lactic acid)
(PLA), poly(phthalaldehyde) (PPA), and poly(bisphenol A carbonate) (PC). We
find that optimally reactive PC scaffolds provide the cleanest graphene
transfers without any annealing, after extensive comparison with optical
microscopy, X-ray photoelectron spectroscopy, atomic force microscopy, and
scanning tunneling microscopy. Comparatively, films transferred with PLA, PPA,
and PMMA have a two-fold higher roughness and a five-fold higher chemical
doping. Using PC scaffolds, we demonstrate the clean transfer of CVD multilayer
graphene, fluorinated graphene, and hexagonal boron nitride. Our annealing
free, PC transfers enable the use of atomically-clean nanomaterials in
biomolecule encapsulation and flexible electronic applications.
