The pristine graphene produced by liquid exfoliation of graphite in mixed solvent and its application to determination of dopamine
Zhang, J (Zhang, Juan)[ 1 ] ; Xu, L (Xu, Liao)[ 1 ] ; Zhou, B (Zhou, Bo)[ 1 ] ; Zhu, YY (Zhu, Yinyan)[ 1 ] ; Jiang, XQ (Jiang, Xiaoqing)[ 1 ]*（蒋晓青）
[ 1 ] Nanjing Normal Univ, Coll Chem & Mat Sci, Jiangsu Key Lab New Power Batteries, 1 Wenyuan Rd, Nanjing 210023, Jiangsu, Peoples R China
JOURNAL OF COLLOID AND INTERFACE SCIENCE，201803,513, 279-286
The pristine graphene can be easily prepared in isopropanol-water mixture with salts as assistant via liquid-phase exfoliation method. The concentration of graphene dispersion reaches as high as 0.565 mg/mL. The graphene film prepared by drop-casting method shows an excellent electrical conductivity (7.095 x 10(4) S/m). Furthermore, an electrochemical biosensor based on the pristine graphene shows high selectivity and sensitivity for the determination of dopamine. The linear detection range for dopamine is 2.5-1500 mu M with detection limit of 1.5 mu M. This method provides a potential process for preparing high-quality graphene ready-to-use in low-boiling point solvent.