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.                .                     . FT-IR                     .  Polyethyleneglycol(PEG)           .Abstract: It is widely recognized that it is hard to prepare hydrophilic graphite nanoparticlesbecause of their high crystallinity and inert characteristics. In this study, we successfully syn-thesized the hydrophilic graphite nanoparticles by using liquid phase pulsed laser ablationmethod which has been actively employed for the thin film deposition up to now. The obtainedhydrophilic graphite showed an ultra-high dispersion stability in water, because the hydrophilicfunctional groups like carboxyl and carbonyl group was simultaneously introduced onto thegraphite surface with the nanoparticle formation, as confirmed by FT-IR and zeta potential mea-surements. Finally, a markedly enhanced gas sensing ability for acetone was shown in com-parison with the conventional carbon black for the carbon polymer composite sensor withpolyethyleneglycol (PEG).Keywords : Liquid phase pulsed laser ablation, Hydrophilic graphite nanoparticles, PEG, Carbon-polymer composite, Electronic nose

Hydrophilic Graphite Nanoparticles Synthesized by Liquid Phase Pulsed Laser Ablation and Their Carbon-composite Sensor Application