Shi Bingfang, Su Yubin, Zhao Jingjin, Liu Rongjun, Zhao Yan, Zhao Shulin
Key Laboratory for the Chemistry and Molecular Engineering of Medicinal Resources, Guangxi Normal University, Guilin, 541004, China.
Nanoscale. 2015 Nov 7;7(41):17350-8. doi: 10.1039/c5nr04659a.
A room temperature reducing agent-free strategy for the synthesis of a nitrogen-doped graphene quantum dot-silver nanoparticle (N-GQD/AgNP) hybrid was presented. In this strategy, N-GQDs were used as a reducing agent and stabilizer for the formation of the N-GQD/AgNP hybrid, and the formation of the N-GQD/AgNP hybrid may result from the extraordinary reduction properties of N-GQDs, which are attributed to the nature of the surface oxygen-containing functional groups. The N-GQD/AgNP hybrid exhibits good dispersity and outstanding catalytic ability toward the oxidation of catechol (CC) and hydroquinone (HQ) by Ag(+). In the presence of the N-GQD/AgNP hybrid, the reduction of Ag(+) by CC and HQ was improved. CC enhanced the absorbance of the N-GQD/AgNP-Ag(+) system the most, and HQ followed, while resorcinol (RC) had only a little effect on the absorption intensity of the system. Thus, a sensitive and selective colorimetric sensing method based on the N-GQD/AgNP-Ag(+) system was developed for the discrimination of CC, HQ and RC. A good linear relationship was obtained from 0.1 to 15.0 μM for CC and from 0.3 to 20.0 μM for HQ. The detection limits of CC and HQ were 0.03 and 0.1 μM, respectively. In addition, the proposed method also shows a high selectivity for the detection of CC and HQ, and appreciable changes in color of the N-GQD/AgNP-Ag(+) system toward CC, RC and HQ were observed.
提出了一种用于合成氮掺杂石墨烯量子点-银纳米颗粒（N-GQD/AgNP）杂化物的无室温还原剂策略。在该策略中，N-GQDs用作形成N-GQD/AgNP杂化物的还原剂和稳定剂，而N-GQD/AgNP杂化物的形成可能源于N-GQDs非凡的还原性能，这归因于其表面含氧官能团的性质。N-GQD/AgNP杂化物表现出良好的分散性以及对Ag(+)催化氧化邻苯二酚（CC）和对苯二酚（HQ）的出色催化能力。在N-GQD/AgNP杂化物存在下，CC和HQ对Ag(+)的还原作用得到增强。CC对N-GQD/AgNP-Ag(+)体系吸光度的增强作用最大，其次是HQ，而间苯二酚（RC）对该体系的吸收强度影响较小。因此，开发了一种基于N-GQD/AgNP-Ag(+)体系的灵敏且选择性的比色传感方法用于区分CC、HQ和RC。CC在0.1至15.0 μM范围内以及HQ在0.3至20.0 μM范围内获得了良好的线性关系。CC和HQ的检测限分别为0.03和0.1 μM。此外，所提出的方法对CC和HQ的检测还表现出高选择性，并且观察到N-GQD/AgNP-Ag(+)体系对CC、RC和HQ的颜色有明显变化。
ACS Biomater Sci Eng. 2017-3-13
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