Journal
LANGMUIR
Volume 25, Issue 14, Pages 7786-7790Publisher
AMER CHEMICAL SOC
DOI: 10.1021/la9017739
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A novel one-pot synthesis method to prepare gold nanorods was developed by using sonochemical reduction of gold ions in aqueous solution. The size of the sonochemically formed gold nanorods was less than 50 nm, and their average aspect ratio decreased with increasing pH of the solution. The aspect ratio measured was 3.0 at pH 3.5. 2.2 at pH 5.0, and 2.1 at pH 6.5. At pH 7.7, irregular shaped gold nanoparticles were formed. At pH 9.8, most of the particles formed had a spherical shape with a smaller particle size than those formed in the lower pH solutions. Based on the obtained results, it was clear that the size and shape of the sonochemically formed gold nanoparticles are dramatically dependent on the pH value of the solution.
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