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Morphology-tunable polydopamine nanoparticles and their application in Fe(3+) detection.


PMID 28501155

Abstract

In this work, we discovered the morphology transformation property of polydopamine (PDA) nanomaterials, the addition of Fe(3+) initiated the dramatic morphology transformation of PDA dots from aggregated plate-like to uniform willow-leaf-like morphology. Further study revealed that this fascinating morphology transformation process could be attributed to the oxidative nature and coordination characteristic of Fe(3+). This is the first report on the morphology transformation ability of PDA, and a probable self-assembled mechanism was proposed to explain this issue. Besides, we noticed that morphological and fluorescent properties of PDA dots were closely related, thus a fluorescent Fe(3+) detection method was presented based on the morphology-tunable PDA dots. With the proposed method, selective Fe(3+) detection was achieved with a wide linear dynamic range of 10μM to 1mM. Furthermore, since the morphology tuning behavior of PDA dots was easy to operate, we anticipate this ability will find significant utility in sensing, drug delivery, and tissue engineering.

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