Core–shell Cu@C@ZIF-8 composite: a high-performance electrode material for electrochemical sensing of nitrite with high selectivity and sensitivity. (28th May 2022)

• Record Type: Journal Article
• Authors: Gao, Feng; Tu, Xiaolong; Yu, Yongfang; Gao, Yansha; Zou, Jin; Liu, Shuwu; Qu, Fengli; Li, Minfang; Lu, Limin
• Is Part Of: Nanotechnology. Volume 33:Number 22(2022)
• Publication Date: 2022-05-28
• Subjects: metal-organic framework -- core–shell heterostructure -- nitrite -- electrochemical detection; Nanotechnology -- Periodicals; Nanotechnology -- Periodicals; Nanotechnology; Publications périodiques; Nanotechnologies; Periodicals; 620.5
• DOI: 10.1088/1361-6528/ac3da7
• Languages: English
• ISSNs: 0957-4484

Abstract

Abstract: Herein, an efficient electrochemical sensing platform is proposed for selective and sensitive detection of nitrite on the basis of Cu@C@Zeolitic imidazolate framework-8 (Cu@C@ZIF-8) heterostructure. core–shell Cu@C@ZIF-8 composite was synthesized by pyrolysis of Cu-metal-organic framework@ZIF-8 (Cu-MOF@ZIF-8) in Ar atmosphere on account of the difference of thermal stability between Cu-MOF and ZIF-8. For the sensing system of Cu@C@ZIF-8, ZIF-8 with proper pore size allows nitrite diffuse through the shell, while big molecules cannot, which ensures high selectivity of the sensor. On the other hand, Cu@C as electrocatalyst promotes the oxidation of nitrite, thereby resulting high sensitivity of the sensor. Accordingly, the Cu@C@ZIF-8 based sensor presents excellent performance for nitrite detection, which achieves a wide linear response range of 0.1–300.0 μ M, and a low limit of detection of 0.033 μ M. In addition, the Cu@C@ZIF-8 sensor possesses excellent stability and reproducibility, and was employed to quantify nitrite in sausage samples with recoveries of 95.45%–104.80%.