Departamento de Química Inorgánica, Facultad de Ciencias, Universidad de Málaga, Campus de Teatinos s/n, 29071 Málaga, Spain.
Sensors and Biosensors Group, Chemistry Department, Universitat Autònoma de Barcelona, 08193 Bellaterra, Barcelona, Spain.
Talanta. 2018 Feb 1;178:679-685. doi: 10.1016/j.talanta.2017.09.082. Epub 2017 Oct 5.
A glassy carbon electrode (GCE) was surface-modified with carbon quantum dots (CQDs) and applied for the effective enhancement of the electrochemical signal for dopamine and uric acid determination. CQDs were prepared from graphite by a green modification of the Hummers method. They were characterized by FTIR-ATR, XPS, solid-state NMR, fluorescence and Raman spectroscopies. TPD-MS analysis was applied to characterize the functionalization of the surface. The CQDs were assembled on the glassy carbon electrode by adsorption because of the large number of carboxy groups on their surface warrants effective adsorption. The modified GCE exhibits a sensitivity that is almost 10 times better than of the bare GCE. The lower limits of detection are 1.3μM for uric acid and 2.7μM for dopamine.
玻碳电极（GCE）经碳量子点（CQDs）表面修饰，用于有效增强多巴胺和尿酸测定的电化学信号。CQDs 由石墨通过 Hummers 法的绿色修饰制备而成。它们的特性通过傅里叶变换衰减全反射红外光谱（FTIR-ATR）、X 射线光电子能谱（XPS）、固态核磁共振波谱（solid-state NMR）、荧光和拉曼光谱进行了表征。热解吸质谱分析（TPD-MS）用于对表面的功能化进行特征分析。由于表面上存在大量的羧基，CQDs 通过吸附组装在玻碳电极上，从而实现有效吸附。修饰后的 GCE 的灵敏度几乎比裸 GCE 提高了 10 倍。尿酸的检测下限为 1.3μM，多巴胺的检测下限为 2.7μM。
