The Nano-GO (1 mg/mL) used in this study was purchased from UniNano Tech Co., Ltd. For size and zeta potential determination, Nano-GO was diluted with deionized water and 10 ÎĽg/mL was analyzed using a Zetasizer (Malvern Nano ZS90 series, Malvern, UK). For the X-ray diffraction (XRD) pattern, the Nano-GO was dried using a freeze-drying method and the Nano-GO was determined using an X-ray diffractometer (PANalytical, Almelo, The Netherlands). Fourier-transform infrared (FTIR) spectra of Nano-GO were acquired using an FTIR spectrophotometer (Spectrum GX; Perkin Elmer, Inc., Boston, MA, USA). The surface morphology of Nano-GO was examined using a Hitachi H-7600 transmission electron microscope (TEM, Hitachi High-Technologies Corp., Tokyo, Japan).
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