pH sensitive CdS–iron oxide fluorescent–magnetic nanocomposites

doi:10.1088/0957-4484/20/48/485601

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Nanotechnology Volume 20 Number 48 Create an alert RSS this journal

Dhananjay Thakur et al 2009 Nanotechnology 20 485601 doi:10.1088/0957-4484/20/48/485601

pH sensitive CdS–iron oxide fluorescent–magnetic nanocomposites

Dhananjay Thakur¹, Shuang Deng², Thierno Baldet² and Jessica O Winter^1,2,3,4

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Abstract References Cited By Supplementary Data

There has been great interest in the use of nanoparticles for imaging, particularly in multimodal applications (e.g., combination of MRI and fluorescence). Yet creating particles with multiple functionalities has been challenging. Here, we report the synthesis of pH sensitive, fluorescent–magnetic, nanocomposites created through a simple aqueous procedure. Separately synthesized superparamagnetic iron oxide nanoparticles and mercaptopropionic acid (MPA)-coated CdS quantum dots were crosslinked using 3-mercaptopropyl trimethoxysilane (MPS) as a bifunctional linker to yield CdS–iron oxide conjugates. Conjugates formed clusters of 0.1–1.0 µm diameter, with the smallest observed particle diameter ~50 nm. Particle solubility and photoluminescent (PL) intensity were sensitive to solution pH, with the highest PL intensity and stability obtained at pH values <3.0 and MPS:Cd:Fe ratios of 1:10:1. pH sensitivity is believed to result from changes in nanoparticle solubility within the silica-based matrix. Given these unique properties, this material might find application in separation, pH sensitive detection (e.g., endosomal tracking) and biosensing.

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