The exploration of novel fluorescent copper-cysteamine nanosheets for sequential detection of Fe3+and dopamine and fabrication of molecular logic circuits

作者：Huang, Zhenzhen; Song, Wenzhi; Li, Yue; Wang, Lingyun; Pandey, Nil Kanatha; Chudal, Lalit; Wang, Min; Li, Yachun; Zhao, Lanlan; Yin, Wanzhong^*; Chen, Wei^*

来源：Journal of Materials Chemistry C, 2020, 8(37): 12935-12942.

DOI：10.1039/d0tc02843f

• HIGHLY SENSITIVE DETECTION
• METAL-ORGANIC FRAMEWORK
• LABEL-FREE DETECTION
• SELECTIVE DETECTION
• QUANTUM DOTS
• CARBON DOTS
• SILVER NANOCLUSTERS
• SENSING PLATFORM
• ASCORBIC-ACID
• FE3+

Herein, newly emerged copper-cysteamine (Cu-Cy) nanosheets with red fluorescence and a good stability were explored as a new type of probe for Fe(3+)and dopamine detection. The sequential detection of Fe(3+)and dopamine by the use of Cu-Cy nanosheets isviaa fluorescence "ON-OFF-ON" mechanism and the Cu-Cy nanosheets showed highly selective and very sensitive detection for Fe(3+)with fluorescence quenching owing to the paramagnetic nature of Fe3+. Furthermore, this fluorescence quenching can be recovered upon the addition of dopamine, which can be used for the development of an "OFF-ON" fluorescence method for the detection of dopamine. The Cu-Cy provides a wider detection range (1-500 mu M for Fe(3+)and 1-20 mu M for dopamine) than most of the other fluorescent probes reported, owing to the large two-dimensional surface area and the high chemical reactivity of the Cu-Cy. Additionally, the sensing strategy was explored by designing molecular logic gates (NOT, XNOR, and NOR) and multiple-input logic circuits in order to convert the molecular information, such as metal ion chelation and oxidation, to detectable fluorescent signals.

• 单位
  1; 吉林大学