Photochemical Interaction of Polystyrene Nanospheres with 193 nm Pulsed Laser Light.
- Resource Type
- Article
- Authors
- Choi; J. H.; Lucas; D.; Koshland; C. P.; Sawyer; R. F.
- Source
- Journal of Physical Chemistry B. Dec2005, Vol. 109 Issue 50, p23905-23910. 6p.
- Subject
- *POLYSTYRENE
*ELECTRON microscopes
*TRANSMISSION electron microscopes
*PHYSICAL & theoretical chemistry
- Language
- ISSN
- 1520-6106
The photochemical interaction of 193 nm light with polystyrene nanospheres is used to produce particles with a controlled size and morphology. Laser fluences from 0 to 0.14 J/cm2 at 10 and 50 Hz photofragment nearly monodisperse 110 nm spherical polystyrene particles. The size distributions before and after irradiation are measured with a scanning mobility particle sizer (SMPS), and the morphology of the irradiated particles is examined with a transmission electron microscope (TEM). The results show that the irradiated particles have a smaller mean diameter (~25 nm) and a number concentration more than an order of magnitude higher than nonirradiated particles. The particles are formed by nucleation of gas-phase species produced by photolytic decomposition of nanospheres. A nondimensional parameter, the photon-to-atom ratio (PAR), is used to interpret the laser-particle interaction energetics. [ABSTRACT FROM AUTHOR]