Optical Properties of Carbon Nanoparticles by Laser Ablation in Nonionic Surfactant Aqueous Solution

Carbon nanoparticles (CNPs) were successfully prepared in pure water and nonionic surfactant aqueous solutions by a liquid laser ablation method.CNPs were obtained from micron-sized carbon black powder by laser irradiation (Nd:YAG, SHG) in a solvent.The prepared CNPs were evaluated by scanning electron microscopy, dynamic light scattering, UV-visible spectrophotometry, fluorescence spectrophotometry, Raman spectrophotometry, and Fourier transform infrared spectrophotometry.CNPs prepared by laser irradiation showed reduced secondary particle size compared to the raw materials, making them suitable for biomedical applications; CNPs exhibited blue and green fluorescence, and the blue to green fluorescence intensity ratio The D/G ratio of the CNPs increased slightly, suggesting the presence of MO-PEG on the particle surface.Therefore, the prepared CNPs are useful for establishing highly accurate bioimaging using dual fluorescence.