基于碳纳米点荧光增强检测铝离子

Synthesis of Carbon Nanodots for Detection of Aluminum Ion with Fluorescence Enhancement

以抗坏血酸(AA)为碳源,通过一步水热法合成水溶性绿色荧光碳纳米点(Carbon nanodots,CDs)。采用透射电子显微镜(TEM)、X射线光电子能谱(XPS)、傅里叶变换红外光谱(FTIR)、紫外-可见吸收光谱和荧光光谱对其形貌和性质进行了研究。基于此碳纳米点与Al3+结合产生的荧光增强现象,建立了检测Al3+的荧光分析方法,在50~500 nmol/L(R^2=0.9988)和500~2000 nmol/L(R^2=0.9976)范围内呈良好的线性关系,检出限为10.23 nmol/L (S/N=3),并用于对瓶装饮用水样品中Al3+的检测。

Water-soluble green fluorescent carbon nanodots(CDs) were synthesized by one-step hydrothermal method with ascorbic acid(AA) as carbon source. The morphology and properties of CDs were characterized by transmission electron microscopy(TEM), X-ray photoelectron spectroscopy(XPS), Fourier Transform Infra-Red(FTIR), ultraviolet-visible(UV-vis) spectroscopy and fluorescence spectroscopy. Based on the fluorescence enhancement phenomenon generated by the combination of CD and aluminum ions(Al3+), a fluorescence analysis method was established to detect Al^3+ with a linear range of 50-500 nmol/L(R^2=0.9988) and 500-2000 nmol/L(R^2=0.9976), respectively. The limit of detection(LODs) was 10.23 nmol/L(S/N=3). Moreover, this method was successfully applied in detection of Al3+ in bottled drinking water samples with recoveries of 97.7%-105.7%.