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Photonic Reactions Leading to Fluorescence in a Polymeric System Induced by the Photothermal Effect of Magnetite Nanoparticles Using a 780 nm Multiphoton Laser
Author(s) -
Park Bum Chul,
Kim HeeDae,
Park June,
Kim Yu Jin,
Kim Young Keun
Publication year - 2017
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201700897
Subject(s) - fluorescence , polymer , biomolecule , photothermal therapy , nanoparticle , conjugated system , photothermal effect , photochemistry , materials science , photonics , laser , magnetite , chemical engineering , nanotechnology , chemistry , optoelectronics , optics , physics , metallurgy , composite material , engineering
Recently, polymer‐coated magnetite (Fe 3 O 4 ) nanoparticles (NPs) are extensively studied for applications in therapeutics or diagnostics using photothermal effect. Therefore, it is essential to understand the interactions between Fe 3 O 4 NPs and polymers when optical stimuli are applied. Herein, the photonic reactions of Fe 3 O 4 NPs and polymer composites upon application of a 780 nm multiphoton laser are analyzed. The photonic reactions produce unique results including fluorescence from conformationally changed polymer and low‐temperature phase transformation of Fe 3 O 4 NPs. Typically, π‐conjugated chains are formed, inducing fluorescence through a series of main and side‐chain cleavage reactions of polymers with the aliphatic chain. In addition, fluorescence is detected in the cellular system by photonic reactions between Fe 3 O 4 NPs and biomolecules. After multiphoton laser irradiation, light emission is detected near the intracellular Fe 3 O 4 NPs, and a stronger intensity is observed in large‐sized NPs.