Abstract
The most striking characteristics of the reprecipitation method, as previously described in Chap. 2, is that prepared organic nanocrystals are dispersed in a stable fashion, owing to their highly negative ζ-potential. This fact is technologically important for some applications. Linear optical properties such as visible (VIS) absorption spectra for poly(DCHD) and perylene nanocrystals and the fluorescence emission spectra from perylene nanocrystals were evidently dependent on their crystal sizes. We will discuss the reason for these interesting optical phenomena in detail, in comparison with the so-called “quantum confinement effect” observed in semiconductor nanoparticles. In addition, we have attempted to fabricate hybridized nanocrystals, which were composed of metal nanoparticles and organic nanocrystals. Namely, poly(DCHD) nanocrystals were individually covered with a gold and/or with a silver thin layer. According to the theoretical prediction [1], the NLO property is expected to be enhanced in these hybridized systems. Finally, we will further demonstrate the enhancement of NLO properties as one of the detailed examples, which is a multilayered poly(DCHD) nanocrystal thin films prepared by utilizing negative ζ-potential.
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Oikawa, H., Nakanishi, H. (2003). Optical Properties of Polymer Nanocrystals. In: Masuhara, H., Nakanishi, H., Sasaki, K. (eds) Single Organic Nanoparticles. NanoScience and Technology. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-55545-9_14
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DOI: https://doi.org/10.1007/978-3-642-55545-9_14
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