Synergistic integration of Au nanoparticles, Co-MOF and MWCNT as biosensors for sensitive detection of low-concentration nitrite

亚硝酸盐 安培法 检出限 碳纳米管 吸附 生物传感器 线性范围 纳米复合材料 材料科学 纳米技术 纳米颗粒 化学工程 胶体金 色散(光学) 金属有机骨架 化学 电极 电化学 色谱法 有机化学 硝酸盐 物理化学 工程类 物理 光学
作者
Hua Lei,Han Zhu,Shuhui Sun,Zhenfeng Zhu,Jiace Hao,Shuanglong Lu,Yurong Cai,Ming Zhang,Mingliang Du
出处
期刊:Electrochimica Acta [Elsevier BV]
卷期号:365: 137375-137375 被引量:75
标识
DOI:10.1016/j.electacta.2020.137375
摘要

Nitrite has been widely existed in food and natural environment systems. To protect the environmental safety and human health, non-enzymatic nitrite sensor with reasonable linear response range, low detection limit (LOD) and excellent storage stability are highly desirable. Herein, we designed a hierarchical structure including the multiwalled carbon nanotube (MWCNT) as substrates, Co-based metal-organic framework (Co-MOF) and high-dispersed small Au nanoparticles (AuNPs) (denoted as AuNPs/Co-MOF/MWCNT). Small Co-MOF nanoplates were firstly grown on the surface of MWCNT, and then provides abundant adsorption sites for catching Au ions. The Co-MOF plays a crucial role in controlling the growth and dispersion of AuNPs, and limits particle growth during the reduction process. Combining MWCNT with Co-MOF can significantly improve the electron transport capability of Co-MOF. On the other hand, small and uniform AuNPs distributed on Co-MOF can reduce the operating voltage and significantly enhance their catalytic activity for nitrite oxidation. Owing to the intriguing synergy between the components, the obtained nitrite sensor device exhibits a broad linear response range from 1 to 1000 µM and a LOD of 0.4 µM (S/N = 3) with a fast response balance (the response time ≈ 3.5 s) at a voltage of 0.72 V. Moreover, this sensor remains 94.5% of their initial response after 20 days of storage at room temperature in air. These results suggested that the AuNPs/Co-MOF/MWCNT nanocomposite has a good application prospect in the amperometric determination of nitrite.
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