Azide-derivatized gold nanosphere %26quot;clicked%26quot; to indium and zinc phthalocyanines for improved nonlinear optical limiting

作者：Bankole Owolabi M; Nyokong Tebello

来源：Journal of Molecular Structure, 2017, 1136: 309-320.

DOI：10.1016/j.molstruc.2017.01.088

• Phthalocyanine
• Gold nanoparticles
• Click reaction
• Reverse saturable absorption
• Nonlinear optics

We report on the conjugation of azide-derivatized gold nanoparticles (AuNPs) to alkyne moieties of ZnPc and InPc via azide-alkyne Huisgen cycloaddition reaction to form phthalocyanines-AuNPs (MPc-AuNPs) conjugates. The detailed structural characterizations of the composites were in good agreement with the expected results. The nonlinear absorption coefficients and other nonlinear optical limiting parameters were almost two times larger for the conjugates compared to free phthalocyanines. We established direct relationship between improved photophysical characterizations and enhanced nonlinear effects of reverse saturable absorption mechanisms favoured by excited triplet absorption of the phthalocyanines in the presence of AuNPs. The combination of InPc with AuNPs resulted in the lowest limiting intensity value of 0.06 J/cm(2), hence the best performance in terms of optical limiting.

• 出版日期2017-5-15