Measurement of Polystyrene Nanospheres Using Excimer Laser Fragmentation Fluorescence Spectroscopy

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Abstract:

Monodisperse polystyrene nanospheres with a mean diameter of 102 nm are photofragmented with 193 nm light in N2 at laser fluences from 1 to 20 J/cm2. Carbon atom fluorescence at 248 nm from the disintegration of the particles is used as a signature of the polystyrene. The normalized fluorescence signals are self-similar with an exponential decay lifetime of ∼10 ns. At fluences above 17 J/cm2, optical breakdown occurs and a strong continuum emission is generated that lasts significantly longer. A non-dimensional parameter, the photon-to-atom ratio (PAR), is used to interpret the laser-particle interaction energetics. Carbon fluorescence from polystyrene particles is compared with that from soot, and a similarity between the two particles is observed when normalized with PAR. Carbon emission from bulk polystyrene was also measured. Similar emission signals were observed, but the breakdown threshold of the surface is significantly lower at 0.2 J/cm2.

Keywords: BREAKDOWN; DISINTEGRATION; ELFFS; EXCIMER LASER FRAGMENTATION FLUORESCENCE SPECTROSCOPY; FLUORESCENCE; NANOPARTICLE; NANOSPHERE; PHOTOFRAGMENTATION; PLASMA

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/000370205774430936

Affiliations: 1: Mechanical Engineering Department, University of California, Berkeley, California 94720 2: School of Public Health, University of California, Berkeley, California 94720 3: Environmental Energy Technologies Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720

Publication date: October 1, 2005

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