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Title: Cyclodextrin-functionalized graphene nanosheets, and their host-guest polymer nanohybrids
Authors: Xu, L.Q.
Yee, Y.K.
Neoh, K.-G. 
Kang, E.-T. 
Fu, G.D.
Keywords: Host-guest interaction
Reduced graphene oxide
Issue Date: 19-Apr-2013
Source: Xu, L.Q., Yee, Y.K., Neoh, K.-G., Kang, E.-T., Fu, G.D. (2013-04-19). Cyclodextrin-functionalized graphene nanosheets, and their host-guest polymer nanohybrids. Polymer (United Kingdom) 54 (9) : 2264-2271. ScholarBank@NUS Repository.
Abstract: β-Cyclodextrin (CD)-functionalized (grafted) reduced graphene oxide (RGO-g-CD) nanosheets were prepared via solution-based synthesis in one-pot, involving the simultaneous solvothermal reduction of graphene oxide (GO) and nitrene addition of azido-labeled CD to RGO. Being water soluble, the grafted CD imparted good dispersibility and stability to the RGO-g-CD nanosheets in water. The RGO-g-CD nanosheets were further functionalized with poly(N- isopropylacrylamide-co-vinylferrocene(II)) (PNIPAM-Fc) and ferrocene-modified hyperbranched polyglycerol (HPG-Fc) via host-guest inclusion complexation of CD and ferrocene (Fc) moieties to form RGO-g-CD/Fc-PNIPAM and RGO-g-CD/Fc-HPG nanohybrids, respectively. Both RGO-g-CD/Fc-PNIPAM and RGO-g-CD/Fc-HPG nanohybrids were dispersible and stable in a wider range of solvents than the RGO-g-CD precursor nanosheets. Due to the thermoresponsive behavior of the attached PNIPAM moieties, the RGO-g-CD/Fc-PNIPAM exhibited reversible dispersibility in aqueous solution at a lower critical solution temperature (LCST) of 28 C and thus could potentially be developed into thermoresponsive nanodevices. The RGO-g-CD/Fc-HPG nanohybrids exhibited low cytotoxicity towards 3T3 fibroblasts in 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl tetrazolium bromide (MTT) cell viability assay.
Source Title: Polymer (United Kingdom)
ISSN: 00323861
DOI: 10.1016/j.polymer.2013.02.043
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