Synthesis Of Novel Low-Dimensional Carbon Materials And Their Optical Properties

This thesis mainly focuses on the synthesis and applications of low dimensional materials. The first part of the thesis discusses the synthesis of graphene quantum dots (GQDs) and their applications in bioimaging and photovoltaic field. Furthermore, the research has expanded to novel two dimensional TiC nanosheets, and their potential application in nonlinear optics (NLO) field.In the first part of research, we have developed a facile general method to synthesize various chemically doped GQDs, which is based on solid reaction of a variety of simple organic precursors. The produced GQDs exhibit high fluorescence, good pH stability and low cyto-toxicity, making them suitable for bio-labelling and optoelectronic applications. As demonstrated herein, this method can be extended to a wider range of precursors, opening a new avenue for the rational design and low cost production of different types of heteroatom doped GQDs. Further investigation including applications of the various doped GQDs in biology and optoelectronics are underway.In the second part, we studied the purification of GQDs and carbon quantum dots using agarose gel electrophoresis technology. The purified products were characterized systematically by various techniques. In the further step, the formation mechanism of GQDs has been confirmed by analysis the components separated from electrophoresis.In the third part, nonlinear optical (NLO) property of the novel 2D material TiC was studied. By employing ultrasonic exfoliation method, TiC nanosheets were successively prepared. Z-scan results of TiC/ITO and MoS2/ITO composite further demonstrate the good NLO property. Our research suggest that the TiC nanosheets has great potential for optical limiting applications.