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윤옥자,이내응,손일융,김덕진 한국고분자학회 2012 Macromolecular Research Vol.20 No.8
Thermomechanical and surface chemical properties of composite films of poly(D,L-lactic-co-glycolic acid) (PLGA) were significantly improved by the addition of graphene oxide (GO) nanosheets as nanoscale fillers to the PLGA polymer matrix. Enhanced thermomechanical properties of the PLGA/GO (2 wt%) composite film,including an increase in the crystallization temperature and reduction in the weight loss, were observed. The tensile modulus of a composite film with increased GO fraction was presumably enhanced due to the strong chemical bonding between the GO nanosheets and the PLGA matrix. Enhanced hydrophilicity of the composite film due to the embedded GO nanosheets also improved the biocompatibility of the composite film. Improved thermomechanical properties and biocompatibility of the PLGA composite films embedded with GO nanosheets may be applicable to biomedical applications such as scaffolds.
Thuy Kieu Truong,T. N. T. Nguyen,TranQuangTrung,손일융,김덕진,정진혁,이내응 한국물리학회 2014 Current Applied Physics Vol.14 No.5
In this study, the reduced graphene oxide field-effect transistor (rGO FET) with indium tin oxide (ITO) extended gate electrode was demonstrated as a transducer for proton sensing application. In this structure, the proton sensing area of the ITO extended gate electrode is isolated from the active area of the rGO FET. The proton sensing properties based on the rGO FET transducer were analyzed. The rGO FET device with encapsulation by a tetratetracontane (TTC) layer showed good stability in electrolytic solutions. The device showed an ambipolar behavior with shifts in Dirac point as the pH of the electrolyte is varied. The pH sensitivity based on the Dirac point shift as a sensing parameter was about 43e50 mV/pH for a wide range of pH values from 2 to 12. The ITO extended gate rGO FET may be considered a potential transducer for sensing of Hþ in electrolytes. Its sensing area can be modified further for various ions sensing applications.