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With the aid of laser ablation using the third harmonic of Nd:YAG laser light, poly(dimethylsilane) (PDMS) powder produced crystalline deposits as the major product together with a small amount of spherical particles with a diameter of 1 μm. In order to produce the spherical fine particles predominantly, photochemical reactivity of carbon disulfide (CS2) and trimethylsilyl azide (TMSAz) was used during the laser ablation process. In the presence of CS2 vapor, laser-ablated PDMS produced spherical particles with a diameter of∼1 μm and aggregated small particles originating from CS2. To escape from producing aerosol particles from the gaseous molecules, TMSAz vapor which itself did not produce any solid product was introduced onto PDMS powder. Laser-ablated PDMS produced only morphologically identical particles on the whole glass plate with a mean diameter of 1.3 μm. The PDMS/TMSAz particles thus obtained showed a fluorescence peak at 344 nm, being shifted to shorter wavelength by 18 nm than that of PDMS powder.

Fluorescent Spherical Particle Formation from Poly(dimethylsilane) by the Aid of Laser Ablation and Photochemical Reaction