Applications of Carbon Nano Materials on Photoanalytical Chemistry

Applications of Carbon Nano Materials on Photoanalytical Chemistry
　　In order to broaden the scope of application of the fullerene (C60) and carbon nanotube (CNT) in the field of photoanalytical chemistry, some investigation had been performed in this dissertation. The dissertation consists of following two parts. In part one, the spectra characteristics of fullerol (C60(OH)n) in water solution as well as the interaction between fullerol and rare earth ions were investigated. And based on the interaction between C60(OH)n/Yb3+ and nucleic acid a new optical chemical method for detecting nucleic acid was developed: (1) The interaction between fullerol (a water-soluble C60 derivative) and several kinds of rare earth ions was investigated by means Block Neodymium magnets of fluorophotometry and the different response characteristics between them were observed. The results showed that the quenching ability of rare earth ions on the fluorescence intensity of fullerol was as follow: Dy3+>Tb3+>Eu3+>Yb3+. (2) Based on the enhancement effect of nucleic acid on the resonance light scattering (RLS) intensity of C60(OH)n/Yb3+ system, a sensitive method for the determination of nucleic acid was proposed.
　　The RLS intensity was proportional to the concentration of nucleic acid in the range of 0-20.0μg mL-1 with the limit of detection of 13.3ng mL-1. In part two, the light scattering phenomenon of multi-walled carbon nanotubes (MWNTs) hydrosol was investigated and new methods for the detection of ascorbic acid (AA) and heavy metal ion (Ag+) were developed: (1) The unique light scattering phenomenon of MWNTs hydrosol was observed. Theλem changed correspondingly along with the change ofλex, and the intensity ofλem increased along with the increase of λex. http://www.999magnet.com/
 Meanwhile a new assay for the determination of AA was established based on the decrease of AA on the scattering light intensity of MWNTs hydrosol. The limit of detection was 3.8×10-8mol L-1. (2) A new method for the detection of Ag+ was proposed based on the enhancement effect of Ag+ on the scattering light intensity of MWNTs hydrosol. The scattering light intensity was proportional to the concentration of Ag+ in the range of 0.0-1.8×10-5mol L-1 with the limit of detection of 1.0×10-7mol L-1.