A comparative study of electrochemical properties of mono- and few-layer samples of nitrogen-doped graphene as nanosized sensor materials for the qualitative and quantitative determination of dopamine and uric acid has been performed. It is found that the few-layer graphene (NGr(f)) is characterized by high sensibility to dopamine, while monolayer one (NGr(m)) is characterized by high sensibility to uric acid in presence of considerable concentrations of ascorbic acid. XPS results show that the nitrogen content is 8.3 at.% in NGr(f) and 6.2 at.% in NGr(m). The analysis of Raman spectra allows to establish, that NGr(f) and NGr(m) have a defective structure. NGr(f) is characterized mainly by edge defects, while NGr(m) is characterized by vacancies, what obviously predetermines the differences in electrochemical properties of these materials.

已经对氮掺杂石墨烯的单层和几层样品作为纳米传感器材料的电化学性能进行了比较研究，用于定性和定量测定多巴胺和尿酸。发现少层石墨烯（NGr（f））的特点是对多巴胺的高敏感性，而单层石墨烯（NGr（m））的特点是在相当浓度的抗坏血酸存在下对尿酸的高敏感性。XPS 结果表明，NGr(f) 中的氮含量为 8.3 at.%，NGr(m) 中的氮含量为 6.2 at.%。拉曼光谱分析可以确定 NGr(f) 和 NGr(m) 具有缺陷结构。NGr(f)主要以边缘缺陷为特征，而NGr(m)以空位为特征，这显然预先决定了这些材料的电化学性能差异。