Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 441, Issue -, Pages 10-16Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2014.11.029
Keywords
Gold nanoparticles; Near infrared; Synthesis; Coating; Dialysis; DiaSynth
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Funding
- Wallace Coulter Foundation: Early Career Phase I award
- NSF-EPSCoR [0814194]
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Hypothesis: A facile, dialysis-based synthesis of stable near infrared (nIR) absorbing plasmonic gold nanoparticles (lambda(max) = 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 lambda(max) = 650-1000 nm. The amount of small gold colloid (lambda(max) = 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 = Abs(nIR)/Abs(530)) of 1.7-2.4 (twice that of previous techniques) and 14.3 times greater OD(*)ml yield of the nIR-absorbing nanoparticle fraction. (C) 2014 Elsevier Inc. All rights reserved.
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