A high yield, one-pot dialysis-based process for self-assembly of near infrared absorbing gold nanop-资料下载-美国布鲁克海文仪器公司

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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.