Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5397546 | Journal of Luminescence | 2017 | 11 Pages |
Abstract
This work reports on the synthesis of glutathione functionalised Ag3Au1 (Ag rich alloy, denoted as AgAu) and Ag1Au3 (Au rich alloy - denoted as AuAg) nano alloys as well as aminopropyl triethoxylsilane capped Ag1Au3 doped silica nanoparticles (NPs). The NPs were covalently linked to indium(III) chloride 2,9(10),16(17),23(24)-tetra-(3-carboxyphenoxy)phthalocyanine (1) via amide bond to form 1-AgAuNPs-GSH and 1-AuAgNPs-GSH. The AgAuNPs were also doped into aminopropyl triethoxylsilane (APTES) silica NPs (SiNPs-APTES) followed by linkage to complex 1 to form 1-AgAu-SiNPs-APTES. The photophysicochemical behaviour of complex 1 and its nanoconjugates were investigated. Decrease in the fluorescence quantum yields and lifetimes was observed in the conjugates in comparison to 1 alone. The singlet oxygen quantum yield for 1-AgAuNPs-GSH and 1-AuAgNPs-GSH decreased probably due to the screening effect caused by the NPs, while that of 1-AgAu-SiNPs-APTES increased in dimethylsulfoxide probably due to the permeability of the porous silica matrix to molecular oxygen.
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Authors
Edith Dube, David O. Oluwole, Tebello Nyokong,