A Novel CuxO Nanoparticles@ZIF-8 Composite Derived from Core–Shell Metal–Organic Frameworks for Highly Selective Electrochemical Sensing of Hydrogen Peroxide

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• 作者：Juan Yang ; Huili Ye ; Faqiong Zhao ; Baizhao Zeng
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2016
• 出版时间：August 10, 2016
• 年：2016
• 卷：8
• 期：31
• 页码：20407-20414
• 全文大小：495K
• 年卷期：0
• ISSN：1944-8252

文摘

A novel core–shell heterostructure of Cu_xO nanoparticles@zeolitic imidazolate framework (Cu_xO NPs@ZIF-8) was successfully prepared through facile pyrolysis of a nanocrystalline copper-based metal–organic framework [nHKUST-1, i.e., Cu₃(BTC)₂ (BTC = 1,3,5-benzene-tricarboxylate)]@ZIF-8, based on the different thermal stability of the two metal–organic frameworks (MOFs). The small Cu_xO NPs derived from nHKUST-1 were uniformly dispersed inside the host material and provided active sites, while ZIF-8 kept the original structure as the molecular sieving shell. Owing to the proper pore shape and pore size of ZIF-8, H₂O₂ could diffuse through the shell, but bigger molecules could not pass. Thus, the composite material exhibited high selectivity when it was used to construct a H₂O₂ sensor. In addition, the sensor showed an extended linear detection range (from 1.5 to 21442 μM), low detection limit (0.15 μM), and high sensitivity, due to the good electrocatalysis of Cu_xO NPs and the synergistic effect of the core–shell structure.