Carbon dots incorporated metal–organic framework for enhancing fluorescence detection performance

• Published in: Journal of materials science Vol. 55; no. 29; pp. 14153 - 14165
• Main Authors: Liu, Xiqing, Zhou, Zhiping, Wang, Tao, Deng, Pengyin, Yan, Yongsheng
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.10.2020; Springer; Springer Nature B.V
• Subjects: Carbon dots; Characterization and Evaluation of Materials; Chemical Routes to Materials; Chemistry and Materials Science; Classical Mechanics; coordination polymers; Core-shell structure; Crystallography and Scattering Methods; detection limit; dispersibility; Ethylenediaminetetraacetic acid; Fluorescence; Imprinted polymers; Malachite green; Materials Science; Metal-organic frameworks; Methylene blue; Molecular imprinting; Nanoparticles; pollution; Polymer Sciences; Reaction time; Selectivity; Sensitivity; Solid Mechanics; Water pollution; Water sampling
• DOI: 10.1007/s10853-020-05027-1
• ISSN: 0022-2461

The fluorescence detection of environmental pollution residues is hugely significant; thus, the improvements in sensitivity and selectivity are still a great task. In this work, a novel molecularly imprinted fluorescence sensor (CDs&ZIF-8@MIPs) with a core–shell structure was prepared for the highly sensitive and selective quantification of malachite green (MG). The high sensitivity was contributed from carbon dots (CDs) as the fluorescence materials and ZIF-8 nanoparticles served as the support materials to ameliorate the dispersibility of CDs. The high selectivity is mainly derived from fabricating thin molecular imprinting polymers in ZIF-8 surfaces. Under the optimum conditions, CDs&ZIF-8@MIPs displayed rapid reaction time (2.0 min), lower detection limit (2.93 nM) with the concentration linear range of 20–180 nM and high selectivity to MG among MG analogs. Importantly, the developed monitoring method was successfully applied to MG determination with the satisfactory recoveries in environmental water samples. This present work effectively improved the sensitivity and selectivity of fluorescence sensors for MG detection.