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A high yield, one-pot dialysis-based process for self-assembly of near infrared absorbing gold nanop
閱讀：216 發(fā)布時(shí)間：2015-5-25| 提 供 商 | 美國(guó)布魯克海文儀器公司 | 資料大小 | 1MB |
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Hypothesis: A facile, dialysis-based synthesis of stable near infrared (nIR) absorbing plasmonic gold nanoparticles
(kmax = 650–1000 nm) will increase the yield of nIR particles and reduce the amount of gold colloid
contaminant in the product mixture.
Experiments: Chloroauric acid and sodium thiosulfate were reacted using a dialysis membrane as a reaction
vessel. Product yield and composition was determined and compared to traditional synthesis methods.
The product particle distribution, yield, and partitioning of gold between dispersed product and
membrane-adsorbed gold were determined.
Findings: The synthesis results in polydisperse particle suspensions comprised of 70% spheroid-like particles,
27% triangular plates, and 3% rod-like structures with a 3% batch-to-batch variation and a prominent
nIR absorption band with kmax = 650–1000 nm. The amount of small gold colloid (kmax = 530 nm;
d < 10 nm) in the isolated product was reduced by 96% compared to traditional methods. Additionally,
91.1% of the gold starting material is retained in the solution-based nanoparticle mixture while 8.2% is
found on the dialysis membrane. The synthesis results in a quality ratio (QR = AbsnIR/Abs530) of 1.7–2.4
(twice that of previous techniques) and 14.3 times greater OD⁄ml yield of the nIR-absorbing nanoparticle
fraction.