Issue 1, 2020

Photocatalytic coatings based on a zinc(ii) phthalocyanine derivative immobilized on nanoporous gold leafs with various pore sizes

Abstract

A series of singlet oxygen sensitizing hybrid materials is reported consisting of a zinc(II) phthalocyanine (ZnPc) derivative immobilized on nanoporous gold leafs (npAu) with various pore sizes. The resulting photocatalytic coatings exhibit a thickness of around 100 nm and pore sizes between 9–50 nm. Herein, we report the synthesis and characterization of those hybrid materials which were synthesized by functionalization of npAu leafs by an azide terminated alkanethiol self-assembled monolayer (SAM) and subsequent copper catalyzed azide–alkyne cycloaddition (CuAAC). The characterization of the samples morphology included scanning electron microscopy (SEM), UV-Vis spectroscopy as well as energy dispersive X-ray spectroscopy (EDX). The morphology–reactivity relationship was investigated employing the hybrid photocatalysts in the photooxidation of diphenylisobenzofuran (DPBF) as selective singlet oxygen quencher. An increasing photocatalytic activity was found for smaller pore sizes up to 15 nm, due to the gain in specific surface area concomitant with an increasing amount of immobilized photosensitizer, completely dominating the effect of the higher spectral overlap caused by the shift of the plasmon resonance of npAu, until mass transport and diffusion limitation gets predominant for pore sizes below 15 nm.

Graphical abstract: Photocatalytic coatings based on a zinc(ii) phthalocyanine derivative immobilized on nanoporous gold leafs with various pore sizes

Supplementary files

Article information

Article type
Paper
Submitted
28 окт 2019
Accepted
16 дек 2019
First published
23 дек 2019
This article is Open Access
Creative Commons BY-NC license

RSC Adv., 2020,10, 53-59

Photocatalytic coatings based on a zinc(II) phthalocyanine derivative immobilized on nanoporous gold leafs with various pore sizes

D. Steinebrunner, G. Schnurpfeil, D. Wöhrle and A. Wittstock, RSC Adv., 2020, 10, 53 DOI: 10.1039/C9RA08841E

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