Over 100 times amplified image recording was achieved by means of reading out nematic isotropic phase transition of liquid crystal induced by partial trans→cis photoisomerization of a small amount(up to 5 mol%) of 4-butyl-4′-methoxyazobenzene mixed with 4-cyano-4′-n-pentylbiphenyl.
Many unique properties of graphene oxide (GO) strongly
depend on the oxygenated functional groups and morphologies. Here,
the photoreaction process is demonstrated to be very useful to control
these factors. We report the fast, simple production of nanopores
in porous GO via photoreaction in O2 under UV irradiation
at room temperature. Quantitative analysis using X-ray photoelectron
spectroscopy showed that nanopores were produced in areas of oxygenated
groups (sp3 carbon bonds), creating porous reduced graphene
oxide (rGO). The photoreaction mechanism was proposed on the basis
of changes in the number of oxygenated groups. Proton conduction occurred
at the basal plane of epoxide groups in virgin GO, even at low humidity,
and at carboxyl groups for porous rGO at high humidity. Thus, GO and
rGO samples with various morphologies, oxygenated functional groups,
and conduction types can be easily fabricated by controlling the photoreaction
conditions.
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