Abstract
The near infrared (NIR) absorption and average particle size of gold nanostars (GNSs) can be precisely controlled by varying the molar ratios of cucurbit[7]urils (CB[7]) and GNSs in aqueous solution. GNSs modified with CB[7] achieved high cargo loading with thermally activated release upon the NIR laser irradiation.
Highlights
Gold nanoparticles (GNPs) have been intensely investigated over the past decades because of their facile synthesis, biocompatibility, chemical stability and unique optical properties1,2
We prepared monodisperse gold nanostars according to a surfactant-free wet-chemistry method42 in order to avoid the potential toxicity of surfactants and the difficulty of replacing the surfactants, such as poly(N-vinylpyrrolidone) (PVP) and cetyltrimethylammonium bromide (CTAB)43,44
Because lack of optical experimental measurements of gold nanostars45,46, the concentration of GNSs was roughly calculated based on the measurement of transmission electron microscope (TEM) and inductively coupled plasma optical emission spectroscopy (ICP-OES)47,48
Summary
Cucurbit[7]uril-Gold Nanostars received: 06 December 2015 accepted: 09 February 2016 Published: 26 February 2016. A variety of gold nanoparticles, such as gold nanorods, nanoshells, nanocages, nanotripods, nanohexapods, nanobellflowers, nanoflowers, and nanostars have been proved to exhibit plasmon resonance in the near-infrared (NIR) region (700–1100 nm) which can penetrate into living organisms with minimally invasive effects, and produce hyperthermia upon the NIR laser irradiation with high efficiency. A variety of gold nanoparticles, such as gold nanorods, nanoshells, nanocages, nanotripods, nanohexapods, nanobellflowers, nanoflowers, and nanostars have been proved to exhibit plasmon resonance in the near-infrared (NIR) region (700–1100 nm) which can penetrate into living organisms with minimally invasive effects, and produce hyperthermia upon the NIR laser irradiation with high efficiency9,10 Among these geometries, nanostars (GNSs) have received a great deal of interest because multiple sharp branches could be more effective in photothermal conversion and cargo loading efficiency relative to those with smooth surfaces owing to their high surface-to-volume ratios. Release system with both autonomous recognition and external control because our long-term goal is to construct multifunctional drug delivery systems by using macrocyclic receptors and nanoparticles
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