A high yield, one-pot dialysis-based process for self-assembly of near infrared absorbing gold nanoparticles
| Autor: | Kurtis T. James, Guandong Zhang, Martin G. O’Toole, Robert S. Keynton, Andre M. Gobin, Dhruvinkumar Patel |
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| Rok vydání: | 2014 |
| Předmět: |
Materials science
Infrared Rays Surface Properties Analytical chemistry Nanoparticle Metal Nanoparticles Membranes Artificial Surfaces Coatings and Films Electronic Optical and Magnetic Materials Dialysis tubing Biomaterials Gold Colloid chemistry.chemical_compound Colloid and Surface Chemistry chemistry Microscopy Electron Transmission Colloidal gold Yield (chemistry) Chloroauric acid Particle Colloids Gold Dialysis (biochemistry) Dialysis |
| Zdroj: | Journal of colloid and interface science. 441 |
| ISSN: | 1095-7103 |
| Popis: | 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 = 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. |
| Databáze: | OpenAIRE |
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