Division of Chemistry & Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371.
Nanoscale. 2015 May 21;7(19):9040-5. doi: 10.1039/c5nr01045d.
Graphene doped with heteroatoms can show new or improved properties as compared to the original undoped material. It has been reported that the type of heteroatoms and the doping conditions can have a strong influence on the electronic and electrochemical properties of the resulting material. Here, we wish to compare the electrochemical behavior of two n-type and two p-type doped graphenes, namely boron-doped graphenes and nitrogen-doped graphenes containing different amounts of heteroatoms. We show that the boron-doped graphene containing a higher amount of dopants provides the best electroanalytical performance in terms of calibration sensitivity, selectivity and linearity of response for the detection of gallic acid normally used as the standard probe for the quantification of antioxidant activity of food and beverages. Our findings demonstrate that the type and amount of heteroatoms used for the doping have a profound influence on the electrochemical detection of gallic acid rather than the structural properties of the materials such as amounts of defects, oxygen functionalities and surface area. This finding has a profound influence on the application of doped graphenes in the field of analytical chemistry.
与原始未掺杂材料相比，掺杂杂原子的石墨烯可以显示出新的或改进的性质。据报道，杂原子的类型和掺杂条件对所得材料的电子和电化学性质有很强的影响。在这里，我们希望比较两种 n 型和两种 p 型掺杂石墨烯，即硼掺杂石墨烯和氮掺杂石墨烯，它们含有不同数量的杂原子。我们表明，含较高掺杂剂的硼掺杂石墨烯在检测通常用作食品和饮料抗氧化活性定量标准探针的没食子酸时，在校准灵敏度、选择性和响应线性度方面提供了最佳的电分析性能。我们的研究结果表明，用于掺杂的杂原子的类型和数量对没食子酸的电化学检测有深远的影响，而不是材料的结构特性，如缺陷、氧官能团和表面积的数量。这一发现对掺杂石墨烯在分析化学领域的应用有深远的影响。
