Hajar Sadeghi - Laser Laboratory, Plasma Physics Research Center, Science and Research Branch, Islamic Azad University, Tehran, Iran.

In this work, effects of concentrations of cetyltrimethylammonium in water, on the characteristics of graphene nanosheets produced by the laser ablation method have been studied experimentally.We used a 7 ns fundamental wavelength of pulsed Nd:YAG laser at 1064 nm and 10 Hz repetition rate to produce carbon nanostructures including graphene in distilled Water and two concentrations of cetyltrimethylammonium (0.1 and 0.01molar). Produced carbon nanostructures were diagnosed using UV-Vis-NIR and Fourier transform infrared spectroscopy, x-ray diffraction, Raman spectroscopy, transmission electron microscopy, and field emission scanning electron microscope images. Results show that different carbon nanostructures such as nanoparticles and few-layer graphene were formed in various liquid environments. We found that the absorption peak position and the size of the carbon material can be controlled by the liquid environment. TEM and FE-SEM images show that size and morphology of nanostructures strongly depends on the liquid environments. Raman spectra show variety aspects, which are due to differences between the various carbon nanostructures.

Pulsed laser ablation, Graphite, Graphene nanosheets,Carbon nanoparticles, TEM