Optical limiters with improved performance based on nanoconjugates of thiol substituted phthalocyanine with CdSe quantum dots and Ag nanoparticles

Abstract

Two alternative synthetic approaches affording a low-symmetry AB-type phthalocyanine 1 bearing two [2'-(2''-mercaptoethoxy)ethoxy] anchoring substituents were developed. Due to the presence of thiol groups, this phthalocyanine could be conjugated with TOPO-capped (TOPO - trioctylphosphine)-capped CdSe quantum dots (CdSe-QDs) or oleylamine capped silver nanoparticles (Ag-NPs). The nonlinear optical behaviour of starting phthalocyanine, quantum dots, nanoparticles and their conjugates was studied by using an open aperture Z-scan technique, revealing that the grafting of 1 onto the nanomaterials resulted in a significant enhancement of the optical limiting of 1-Ag and 1-CdSe in comparison with the individual components. The conjugate 1-CdSe, being the first example of Pc-based thiol conjugated with quantum dots, revealed superior limiting characteristics with a limiting threshold below 0.18 J cm.

Recent progress in organometallic porphyrin‐based molecular materials for optical sensing, light conversion, and magnetic cooling

“…We are here obliged to cite significant works on the study and the application of the porphyrin/phthalocyanine sensitizers for PDT/diagnostics, [ 180–187 ] the catalysts based on the porphyrin/phthalocyanine complexes of rhenium [ 188–191 ] and iridium [ 192,193 ] for redox reactions that are beyond the scope of our review, and the shift reagents based on REE porphyrin complexes in NMR. [ 194–196 ]…”

Phthalocyanines and Naphthalocyanines with Sulfur-Containing Functional Groups: Synthesis, Preparation of Hybrid Gold Nanoparticles and Some Application Areas

“…In the case of thiobenzoyl group the last stage implied mild cleavage of benzoyl protective groups. [71] Due to the presence of thiol groups, this phthalocyanine could be conjugated with triocylphosphineoxide-capped CdSe quantum dots or oleylamine capped silver nanoparticles (Ag-NPs). These conjugates possess enhanced nonlinear optical response in comparison with individual components.…”

Benzoannelated A3B-Phthalocyanines with Diethyleneglycol Substituents: Synthesis and Control of Aggregation

“…[2][3][4][5] For example, the immobilization of phthalocyanines on the surface of quantum dots and nanoparticles leads to conjugates with improved nonlinear optical properties affording their application as optical limiters of laser radiation. [6,7] Compared with the widely studied symmetrical phthalocyanines, the information about asymmetrical analogues is limited. [8,9] At the same time, from the viewpoint of phthalocyanines immobilization on the surface of inorganic materials, asymmetric phthalocyanines are particularly interesting, because the introduction of various types of functional fragments and simultaneously anchoring groups for molecule attachment makes it possible to extend the applications of hybrid materials based on them.…”