Journal
COLLOIDS AND SURFACES B-BIOINTERFACES
Volume 81, Issue 2, Pages 648-651Publisher
ELSEVIER
DOI: 10.1016/j.colsurfb.2010.07.060
Keywords
Dendrimer; Gold nanoparticle; Near-infrared; Seeding growth; Polyethylene glycol
Funding
- Hayashi Memorial Foundation for Female Natural Scientists
- Ministry of Education, Culture, Sports, Science, and Technology of Japan (MEXT)
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The photochemical properties of gold nanoparticles (Au NPs) are largely influenced by their size and morphology. Stably dispersed Au NPs that absorb near-infrared (NIR) light are useful for biomedical applications. We prepared well-dispersed NIR-absorbing Au NPs using seeding growth from Au NPs encapsulated in polyethylene glycol (PEG)-attached dendrimers. Formaldehyde was used as a reductant to prepare gold nanoparticles with convex-concave surfaces. Low pH and an appropriate amount of gold ion were required to prepare Au NPs that absorbed NIR-light. Interestingly, the encapsulation of Au NPs within the PEGylated dendrimers was important for preparation of NIR-absorbing Au NPs. Transmission electron microscope (TEM) analysis showed that these Au NPs had convex-concave surfaces and large diameters. This paper presents a novel preparation method for NIR-responsive Au NPs by reduction with formaldehyde. (C) 2010 Elsevier B.V. All rights reserved.
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