Chem. J. Chinese Universities ›› 2009, Vol. 30 ›› Issue (8): 1497.

• Articles • Previous Articles     Next Articles

Preparation of Fluorescent Carbon Nanoparticles by Pulsed Laser

HU Sheng-Liang1*, BAI Pei-Kang1, CAO Shi-Rui1, SUN Jing2   

  1. 1. School of Materials Science and Engineering, North University of China, Taiyuan 030051, China;
    2. School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China
  • Received:2008-10-13 Online:2009-08-10 Published:2009-08-10
  • Contact: HU Sheng-Liang. E-mail: hsliang@yeah.net
  • Supported by:

    山西省青年科技研究基金(批准号: 2009021027)、中北大学校青年科技基金、人才引进启动基金(批准号: 20080302)和天津市自然科学基金重点项目(批准号: 06YFJZJC 01200)资助.

Abstract:

Ultrafine carbon nanoparticles were prepared by irradiating graphite suspension employing millise-cond pulsed laser. Carbon nanoparticles emitted strong visible light after surface modification using PEG 2000. The characteristic of two-photon fluorescence was detected in the experiment. Fluorescence quantum yield of carbon nanoaprticles was 6.3% employing quinine sulfate in 0.1 mol/L H2SO4 as the standard reference sample. Graphite particles were heated up and sublimed by laser energy absorption; therefore, a large amount of carbon vapors were produced. After pulse duration, the carbon vapors cooled quickly under the liquid medium and formed carbon nanoparticles by condensation. Surface energy traps were created on the carbon nanoparticles after surface modification and resulted in the visible light emission due to the quantum confinement effects. Fluorescent carbon nanoparticles show high potential on the application of biology labeling and life science due to many advantages such as low cytotoxicity, biocompatibility, and chemically inert.

Key words: Carbon nanoparticle; Fluorescence; Pulsed laser

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