Journal
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Volume 17, Issue 23, Pages 15124-15130Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5cp00932d
Keywords
-
Funding
- Ministry of Science and Technology [NSC 100-2628-M-110-001- MY4]
Ask authors/readers for more resources
This study describes the synthesis of fluorescent polydopamine dots (PDs) through hydroxyl radical-induced degradation of polydopamine nanoparticles. The decomposition of polydopamine nanoparticles to fluorescent PDs was confirmed using transmission electron microscopy and dark-field microscopy. The analysis of PDs by using laser desorption/ionization time-of-flight mass spectrometry revealed that the PDs consisted of dopamine, 5,6-dihydroxyindole, and trihydroxyindole units. Oligomerization and self-assembly of these units produced a broad adsorption band, resulting in an excitation-wavelength-dependent emission behavior. The maximal fluorescence of PDs appeared at 440 nm with a quantum yield of 1.2%. The coordination between the catechol groups of PDs and ferric ions (Fe3+) quenched the fluorescence of PDs; the limit of detection at a signal-to-noise ratio of 3 for Fe3+ was determined to be 0.3 mu M. The presence of pyrophosphate switched on the fluorescence of the PD-Fe3+ complexes. Compared to the other reported methods for sensing Fe3+, PDs provided simple, low-cost, and reusable detection of Fe3+.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available