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Size Characterization of Ultrasmall Silver Nanoparticles Using MALDI-TOF Mass Spectrometry
Size Characterization of Ultrasmall Silver Nanoparticles Using MALDI-TOF Mass Spectrometry
Bulletin of the Korean Chemical Society. 2014. Mar, 35(3): 961-964
Copyright © 2014, Korea Chemical Society
  • Received : October 11, 2013
  • Accepted : November 08, 2013
  • Published : March 20, 2014
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About the Authors
Byung Hyo Kim
Hogeun Chang
Michael J. Hackett
Jinkyung Park
Pilsun Seo
Taeghwan Hyeon

Abstract
Keywords
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Experimental
Synthesis of Silver Nanoparticles. 0.17 g of silver nitrate (Strem Chemical) was added to 0.5 mL of oleylamine (Acros Organics) and 4.5 mL of oleic acid (Sigma-Aldrich Inc.). The mixture was degassed at 70 ℃ for 90 min under vacuum and the reaction vessel was purged with argon. For the synthesis of 1.8 nm-sized nanoparticles, the solution was heated to 180 ℃ at a heating rate of 10 ℃/min and maintained for 2 min. For 3.7 nm-sized nanoparticles, the heating rate was set to 1 ℃/min and the reaction was stopped when the temperature just reached 180 ℃. After the reaction, the reaction vessel was cooled to room temperature and washed with 10 mL of toluene and 50 mL ethanol. The nanoparticles were dispersed in chloroform.
Characterization. MALDI-TOF MS was performed on a Voyager-DE TM STR Biospectrometry Workstation (Applied Biosystems). Nanoparticles dispersed in chloroform were mixed with 9-nitroanthracene dissolved in chloroform (Sigma-Aldrich Inc.) in a weight ratio of 1:1 and spotted onto a target plate. The mass spectra were obtained with the 40-50% of the laser’s full power. All of the mass spectra were smoothed with a simple average of 100 data points. TEM images were taken with a JEOL-2010 electron microscope and TGA data were collected with a Q-5000 IR (TA Instrument).
Acknowledgements
This work was supported by Institute for Basic Science (IBS).Supporting Information.TGA data and corresponding TEM images, calculated surface ligand density.
References
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