Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Simple Crystal Phase Control of TiO2 Nanoparticles via Pulsed Laser Ablation in Nitric Acid

  • Hong, Seong Min (Department of Chemistry and Research Institute of Natural Science, Gyeongsang National University) ;
  • Lee, Seulki (Department of Chemistry and Research Institute of Natural Science, Gyeongsang National University) ;
  • Jung, Hyeon Jin (Department of Chemistry and Research Institute of Natural Science, Gyeongsang National University) ;
  • Yu, Yiseul (Department of Chemistry and Research Institute of Natural Science, Gyeongsang National University) ;
  • Choi, Myong Yong (Department of Chemistry and Research Institute of Natural Science, Gyeongsang National University)
  • Received : 2013.09.06
  • Accepted : 2013.09.25
  • Published : 2013.12.20
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Abstract

Keywords

Experimental

The experimental setup for the generation of metal nanoparticles via PLAL is described in detail elsewhere.10 Briefly, the Ti (99.999%, Sigma-Aldrich) plate was fixed in a Pyrex vial filled with de-ionized (DI) water (10 mL) and the HNO3 solution under a nitrogen purge continuously stirred by a magnetic bar. A pulsed Nd:YAG laser (1064 nm, 10 Hz, 7 ns) was focused onto the surface of the Ti plate with a spot size of about 1 mm diameter using a lens with a focal length of 25 mm. Laser ablation was continued for 30 min with a laser pulse energy of 80 mJ/pulse. The HNO3 solutions used for PLAL were prepared at concentrations of 10−3, 1, 3, 6, and 10 M. The ablated solutions were washed several times with DI water using a centrifugation rate of 13000 rpm for 10 min to remove HNO3. The resulting sediments were collected and then individually sonicated after addition of DI water and centrifugation. This washing procedure was repeated several times. Each experiment was repeated at least 10 times and the sediments were collected and dried on a silicon substrate at room temperature. The morphology and structure of the nanoparticles produced by PLAL were investigated with a field emission scanning electron microscope [FE-SEM, XL30 S FEG, Philips (15 kV)] and transmission electron microscope [TEM, JEOL, JEM-2-10 (200 kV)]. X-ray diffraction (XRD) patterns of the nanoparticles were obtained with a Bruker AXS D8 DISCOVER with GADDS diffractometer using Cu Kα (0.1542 nm) radiation with a Bragg angle ranging from 10 to 90°.

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