Stabilization of (CdSe)ZnS Quantum Dots with Polypyrrole Formed by UV/VIS Irradiation Initiated Polymerization
Polypyrrole formation initiated by UV/VIS irradiation and stabilization of (CdSe)ZnS quantum dots is reported. Presented results demonstrate that UV/VIS irradiation is slowly destructing Q-dots that decreases quantum yield and shifts peak of photoluminescence (PL) spectra to short wavelength range. The same Q-dot solution under UV/VIS light irradiation in the presence of pyrrole is more stable, there is no PL band shifts only PL intensity of Q-dot decrease. UV/VIS induced Ppy formation process in the presence/absence of Q-dots dissolved in toluene and phosphate buffer saline (PBS) not containing Q-dots was investigated. The increase in the optical absorbance in the range of 400 nm–600 nm was exploited for the monitoring of polypyrrole formation process. Results obtained proved that in the presence of UV/VIS formed polypyrrole destruction of Q-dots is much slower if compared with bare Q-dots destruction under similar conditions. However, formed polypyrrole showed no positive effect on quantum yield of Q-dot, just the opposite—polypyrrole quenched Q-dot photoluminescence. Results presented and observation by other authors on pyrrole polymerization allow to predict that by UV/VIS induced polymerization formed polypyrrole is assembling polymeric layer on heterogeneous phase between Q-dot and toluene or water (in PBS solution). Established π–π conjugated chain of formed polypyrrole quenches photoluminescence of Q-dot because this polymer was formed in close proximity to Q-dot surface.
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Document Type: Research Article
Publication date: March 1, 2009
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