Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Synthesis and Surface-Enhanced Raman Scattering Property of Pentagonal Dodecahedral Au Nanocrystals

  • Kim, Minjung (Department of Chemistry and KI for the NanoCentury, KAIST) ;
  • Jeong, Gyoung Hwa (Department of Chemistry and KI for the NanoCentury, KAIST) ;
  • Lee, Young Wook (Department of Chemistry and KI for the NanoCentury, KAIST) ;
  • Han, Sang Woo (Department of Chemistry and KI for the NanoCentury, KAIST)
  • Received : 2013.09.30
  • Accepted : 2013.10.03
  • Published : 2014.03.20
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Abstract

Keywords

Experimental

In a typical synthesis of PD Au NCs, an aqueous solution (10 mM, 1 mL) of HAuCl4·3H2O (99.9+%, Aldrich) was added to 25 mL of DMF. This solution was heated at 90 °C for about 2 h in a conventional forced-convection drying oven. Then, an aqueous solution (50 mg/mL, 1 mL) of PVP (Mw = 630,000, Fluka) was quickly injected into the reaction solution and further heated for 6 h. The prepared NCs were separated by centrifugation, and then washed thoroughly with water and ethanol.

FESEM images of the sample were taken with a fieldemission scanning electron microscope (Phillips Model XL30 S FEG). TEM images were obtained with a Tecnai G2 F30 transmission electron microscope operating at 300 kV after placing a drop of NC solution on a carbon-coated Cu grid (200 mesh). XRD patterns were obtained with a Bruker AXS D8 DISCOVER diffractometer using Cu Kα (0.1542 nm) radiation. Raman spectra were obtained using a Jobin Yvon/HORIBA LabRAM spectrometer equipped with an integral microscope (Olympus BX 41). The 632.8 nm line of an air-cooled He/Ne laser was used as an excitation source. Raman scattering was detected with 180° geometry using an air-cooled 1024 × 256 pixel charged coupled device (CCD) detector. The Raman band of a silicon wafer at 520 cm−1 was used to calibrate the spectrometer. SERS sample was prepared by dropping 30 μL of a 0.1 mM ethanol solution of 4- ABT or BT onto the drop-casting film of NCs on a Si substrate. After 1 h, it was washed with ethanol and dried under ambient condition.

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