Journal
JOURNAL OF MATERIALS CHEMISTRY C
Volume 8, Issue 16, Pages 5554-5561Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9tc07072a
Keywords
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Funding
- National Natural Science Foundation of China [21667018, 31860470, 21876199, 21804010, 21976209, 31660482]
- Chinese Academy of Sciences President's International Fellowship Initiative [2019PC0050]
- National Research Foundation of Korea [2019R1A2C3004375, 2018M3A7B4071203]
- Taishan Scholar Project Special Fund [ts20190962]
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A blue-, yellow- and red-emitting fluorescence sensor was constructedviathe synergy of manganese dioxide (MnO2) nanosheets,o-phenylenediamine (OPD) and red-fluorescent quantum dots (r-QDs), namely MnO2-OPD-QD, for visualization of ascorbic acid (AA) and alkaline phosphatase (ALP). Initially, by virtue of the oxidase-like activity of MnO(2)nanosheets, OPD was oxidized into yellow-fluorescent OPDox (emission: 569 nm), which quenched the r-QDs (emission: 659 nm). After interaction with AA, one reaction product of ALP and 2-phospho-l-ascorbic acid (AA2P), the MnO(2)nanosheets were reduced and lost the oxidase-like activity, so that the generation of OPDox was lessened and the fluorescence of the r-QDs was thereupon recovered. Further increasing AA or ALP, the MnO(2)nanosheets were fully decomposed so that OPD was not oxidized but was reduced into blue-fluorescent OPDred (emission: 441 nm), while the r-QDs were not affected. Overall, AA or ALP triggered emission intensity changes at 441, 569 and 659 nm and led to profuse color variation over the yellow-orange-red-purple range, realizing multiplex and visual determination of AA and ALP in the ranges of 0.5-70 mu M and 0.1-100 mU mL(-1), respectively. The color variation range of the ternary-emission mode was greatly enlarged, especially compared with that of the single-/dual-emission mode. Accordingly, the MnO2-OPD-QD sensor provided detection limits for AA and ALP as low as 0.18 mu M and 0.06 mU mL(-1), respectively. Furthermore, the highly selective/sensitive measurement and accurate readout of AA and ALP were accomplished in complicated food and serum samples. The multi-emitting fluorescence sensor held great potential for onsite visualization of various targets in more fields.
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