期刊
MICROCHIMICA ACTA
卷 187, 期 6, 页码 -出版社
SPRINGER WIEN
DOI: 10.1007/s00604-020-04337-0
关键词
Dual-mode sensor; Colorimetry; ratiometric fluorescence; N; P-co-doped carbon dots; Formaldehyde; Cell imaging
资金
- Yancheng Institute of Technology [xjr2019021, xjr2019020]
- Natural Science Foundation of Jiangsu Province [BK20191041]
- National Natural Science Foundation of China [21671101]
Novel colorimetric and ratiometric fluorometric dual-mode N, P-co-doped carbon nanodots, BPEI-CDs, for highly sensitive and selective detection of formaldehyde (FA) were successfully prepared from N-(phosphonomethyl)iminodiacetic acid (PMIDA) and branched polyethyleneimine (BPEI). The treatment of FA caused a remarkable linear enhancement of ratiometric fluorescence (F-501 nm/F-408 nm) in a wide range of 0-40 mu M with a detection limit (LOD) of 0.47 mu M (3 sigma /k), along with distinct color changes from colorless to light yellow. Mechanistic study shows that this electron-rich system, formed by the cooperative roles of N and P, promoted the FA-induced Schiff bases formation reaction, which contributed to the CD aggregation-induced emission (AIE) turn-on response and enhancement of -conjugation-induced bathochromic behaviors. Furthermore, N, P-co-doped BPEI-CDs were successfully applied to the determination of FA in bean sprout samples. Using the standard addition method, the recoveries ranged from 96.9 to 101.8%, and the relative standard deviation (RSD) was in the range 2.23 to 3.21%. The application for intracellular FA sensing further verified that this novel nanoprobe may offer a new venue for the design of simple, low-cost, and sensitive biosensors.
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