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Controlling aspect ratio of colloidal silver nanorods using response surface methodology

Hormozi Nezhad, M. R ; Sharif University of Technology | 2012

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  1. Type of Document: Article
  2. DOI: 10.1016/j.colsurfa.2011.10.023
  3. Publisher: 2012
  4. Abstract:
  5. The properties of metallic nanorods vary due to changes in their composition, size and shape, which all depend on the aspect ratio of the nanorods. This work focuses on the optimization of the aspect ratio of silver nanorods using response surface methodology (RSM). Seed-mediated approach, which is the newest method with less difficulty, has been used for the synthesis of silver nanorods. First, silver ions were reduced with sodium borohydride in the presence of sodium citrate dehydrate, as stabilizer. Then, the prepared seeds were added to a solution containing more metal salts, a weak reducing agent (ascorbic acid) and a rod-like micellar template (cetyltrimethylammonium bromide, CTAB). Three factors affecting the aspect ratio were optimized. These factors were ratio of metal seed to metal salt, amount of ascorbic acid and the concentration of CTAB. Mathematical models were proposed for the prediction of transverse and longitudinal plasmon band wavelengths and the optimized condition was obtained for the synthesis of the silver nanorods with highest aspect ratio. It is found that the ratio of metal seeds to metal salt plays a major role in controlling the aspect ratio of the silver nanorods. The optimum values for the factors were found to be 0.06mL of seed, 7.2×10 -3M of ascorbic acid and 0.05M of the CTAB in the final solution. The optimum predicted value for the longitudinal plasmon band was 653.9nm, which is in agreement with the experimental value of 655.0nm
  6. Keywords:
  7. Experimental design ; Ascorbic acids ; Cetyl trimethyl ammonium bromides ; Colloidal silver ; Experimental values ; Metal salt ; Metallic nanorods ; Optimized conditions ; Optimum value ; Plasmon band ; Response Surface Methodology ; Seed mediated ; Silver ions ; Silver nanorods ; Size and shape ; Sodium borohydrides ; Sodium citrate ; Ammonium compounds ; Bromine compounds ; Design of experiments ; Ketones ; Mathematical models ; Metal ions ; Metals ; Nanorods ; Optimization ; Organic acids ; Plasmons ; Seed ; Surface properties ; Aspect ratio ; Ascorbic acid ; Cetrimide ; Collargol ; Nanorod ; Silver ; Unclassified drug ; Colloid ; Mathematical model ; Methodology ; Nanotechnology ; Priority journal ; Reproducibility ; Response surface method ; Synthesis
  8. Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects ; Volume 393 , 2012 , Pages 46-52 ; 09277757 (ISSN)
  9. URL: http://www.sciencedirect.com/science/article/pii/S0927775711006686