Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 9, Issue 51, Pages 44324-44331Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b15434
Keywords
electrochemiluminescence; coumarin derivative; donor-acceptor; organic nanoparticles; aggregation
Funding
- National Science Foundation of China [21522504, 21375084, 21475082]
- 111 project [B14041]
- Fundamental Research Funds for the Central Universities [GK201603041, 2016CBY001]
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Organic nanoparticles (NPs) from donor acceptor based coumarin derivatives, 6-[4-(N,N-diphenylamino)phenyl]-3-ethoxycarbonyl coumarin (DPA-CM), with an average size of 5.82 nm, were synthesized by a facile reprecipitation method using water as a poor solvent and tetrahydrofuran as a good solvent. Red-shifted absorption, blue-shifted photoluminescence emission, and aggregation-induced enhanced electrochemiluminescence (ECL) emission were observed for the DPA-CM NPs in aqueous solution compared with the original DPA-CM in organic solution. The aggregation-induced enhanced ECL emission is ascribed to the combined effects of the small size of the DPA-CM NPs, the restricted conformational relaxation in the NPs, and the good stability of the cationic radical of DPA-CM. A strong and stable ECL emission is obtained at the DPA-CM NPs modified glassy carbon electrode in the presence of tri-n-propylamine, and the ECL intensity of the DPA-CM NPs modified electrode is quenched linearly in the range of 0.05-50 mu M with detection limit of 0.04, 0.2, and 0.4 mu M for ascorbic acid, uric acid, and dopamine, respectively. This work shows an example of donor acceptor based organic NPs as ECL emitters and their analytical applications to monitor biomolecules.
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