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Fabrication of Triple-Layered Magnetite/Hydrogel/Quantum Dots via the Molecular Linkage of Bi-Functional Diamines

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A multifunctional biomedical agent with magnetism, pH-sensitive, fluorescent properties was fabricated as a triple-layered magnetite/hydrogel/quantum dots. First, core–shell magnetic silica nanospheres (Fe3O4@SiO2) were synthesized via the sol–gel reaction of magnetite clusters with tetraethyl orthosilicate (TEOS), and the resuting magnetic particles were encapsulated with poly(N-isopropylacrylamide-co-acrylic acid) hydrogels through a free radical polymerization. The hydrogel-encapsulated magnetic particles were subsequently anchored by quantum dots (QDs) via the molecular linkage of bi-functional diamines. Diamine molecules effecrively induced the crosslinking between magnetic hydrogels and quantum dots. Among diamine linkers with different chain lengths (C-4, C-8, and C-12), C-8 diamine (1,8-diaminooctane) produced the maximal PL intensity for QD-bound hydrogels, indicating that C-8 diamine was an optimal cross-linker between hydrogels and QDs with surface carboxylic acid groups. The characteristic properties of the multifunctional nanocomposites were analyzed by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), zeta-potential meter, and photoluminescence (PL) spectroscopy.

Document Type: Research Article


Publication date: July 1, 2012

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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