紫甘蓝碳点的制备及其传感性能研究

Preparation of carbon quantum dots from violet cabbage and its sensing properties

以紫甘蓝为原料,硼氢化钠为还原剂,采用水热合成法制备了碳量子点ZGL-CQDs。该碳点的结构经XRD,TEM和FT-IR表征;光学性能研究表明:荧光量子产率可达6.20%,最大激发波长为360 nm,最大发射波长为446 nm;传感性能研究表明:该碳点在水溶液中对Cu^(2+)具有较好的选择性,对Cu^(2+)测定的线性范围为0.6×10^(-6)~2.60×10^(-6)mol/L,线性方程Y=-15.44958-2.05871x,R^2=0.9978,检出限为3.16×10^(-7)mol/L。

Carbon quantum dots ZGL - CQDs were prepared by hydrothermal synthesis method using red cabbage as raw material, and sodium borohydride as reducing agent. The structure of carbon quantum dots was characterized by XRD, TEM and FT - IR. The studies of optical property have shown that the fluorescence quantum yield reached 6.20% , and the maximum excitation and emission wavelength were 360 nm and 446 nm respectively. The sensing performance studies demonstrated that ZGL- CQDs could recognize Cu2＋ in aqueous solution with a high specificity. The linear equation for the detection is Y = - 15. 44958 - 2. 05871x, R2 = 0. 9978, with the linear range of 0.6 ×10-6- 2.60 × 10 -6 mol/L and the detection limit of 3.16 × 10 -7 mol/L.