Facilely prepared Fe3O4/nitrogen-doped graphene quantum dot hybrids as a robust nonenzymatic catalyst for visual discrimination of phenylenediamine isomers

• DOI: 10.1039/c6nr02725c
• Publication Date: 2016-04-25T12:03:25Z
• Authors: Bingfang Shi; Yubin Su; Liangliang Zhang; Mengjiao Huang; Xuefeng Li; Shulin Zhao
• Keywords: 01 natural sciences; 0104 chemical sciences

In this work, we report a reducing agent-free strategy for the synthesis of Fe3O4 nanoparticle/nitrogen-doped graphene quantum dot (Fe3O4/N-GQD) hybrids, and constructed sensing platform based on Fe3O4/N-GQDs visual discrimination phenylenediamine isomers. were facilely prepared by hydrothermal treatment Fe3+/N-GQD solutions under alkaline conditions without other reagents. The exhibited outstanding peroxidase-like activity stable wide range pH values temperatures. isomers (o-phenylenediamine, m-phenylenediamine, p-phenylenediamine) discriminated through H2O2-mediated oxidation reaction using as novel peroxidase mimics, which resulted in appreciable color changes. proposed method is simple, economical, effective isomers, can be used sensitive selective quantitative analysis o-phenylenediamine p-phenylenediamine. A good linear relationship from 1 to 90 μM detection limit 230 nM achieved, p-phenylenediamine was 2 70 with 530 nM. may open new applications biomedicine environmental chemistry.