Delamination of graphite oxide in a liquid upon cooling

Graphite oxide (GO) in liquid acetonitrile undergoes a transition from an ordered phase around ambient temperature to a gel-like disordered phase at temperatures below 260 K, as demonstrated by in situ X-ray diffraction. The stacking order of GO layers is restored below the freezing point of acetonitrile (199 K). The reversible swelling transition between a stacked crystalline phase and an amorphous delaminated state observed upon cooling provides an unusual example of increased structural disorder at lower temperatures. The formation of the gel-like phase is attributed to the thermo-responsive conformational change of individual GO flakes induced by stronger solvation. Scanning force microscopy demonstrates that GO flakes deposited onto a solid substrate from acetonitrile dispersions at a temperature below 260 K exhibit corrugations and wrinkling which are not observed for the flakes deposited at ambient temperature. The thermo-responsive transition between the delaminated and stacked phases reported here can be used for sonication-free dispersion of graphene oxide, micro-container applications, or the preparation of new composite materials.

Klechikov, AlexeyUmeå universitet,Institutionen för fysik(Swepub:umu)alkl0012 (författare)
Korobov, Mikhail (författare)
Rebrikova, Anastasiya T (författare)
Avramenko, Nataliya V (författare)
Gholami, M Fardin (författare)
Severin, Nikolai (författare)
Rabe, Jürgen P (författare)
Umeå universitetInstitutionen för fysik (creator_code:org_t)

Ingår i:Nanoscale: Royal Society of Chemistry (RSC)7:29, s. 12625-126302040-33642040-3372

Av författaren/redakt...: Talyzin, Alexand ...; Klechikov, Alexe ...; Korobov, Mikhail; Rebrikova, Anast ...; Avramenko, Natal ...; Gholami, M Fardi ...; visa fler...; Severin, Nikolai; Rabe, Jürgen P; visa färre...

Om ämnet

Kungliga biblioteket hanterar dina personuppgifter i enlighet med EU:s dataskyddsförordning (2018), GDPR. Läs mer om hur det funkar här.
Så här hanterar KB dina uppgifter vid användning av denna tjänst.