Silicon naphthalocyanine nanoparticles were successfully prepared by laser ablation in liquid. Silicon 2,3-naphthalocyanine bis(trihexylsilyloxide) powders in deionized water were irradiated with nanosecond-pulsed laser (Nd:YAG, SHG) to prepare nanoparticles. The prepared nanoparticles were investigated by scanning electron microscopy, dynamic light scattering and spectrophotometry. The shape was polygonal and partially spherical. The primary and secondary particle sizes were reduced with an increase in laser fluence. Absorbance was increased at low laser fluence and was constant at high laser fluence with the increase in laser fluence. The ratio of the two absorbance peaks was changed with the increase in laser fluence.
Naphthalocyanine nanoparticles were prepared by laser ablation in liquid using second-harmonics of nanosecond Nd:YAG laser as an excitation light sauce at various laser fluence, and the properties of naphthalocyanine nanoparticles, such as shape, size, zeta potential, chemical structure and optical absorption were examined. The scanning electron microscopy (SEM) and dynamic light scattering (DLS) measurements showed that the particle size of the nanoparticles could be controlled by the laser fluence. The IR spectra of the nanoparticles indicated the formation of carboxylate anion species at laser fluences above 100 mJ/cm 2 , which will result the zeta potential of the nanoparticles depending on the laser fluence. We also examined the potential application to contrast agents for photoacoustic, and confirmed that the naphthalocyanine nanoparticles generated a strong photoacoustic signal.
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