15November2019

Nano-Micro Letters

Enhanced Catalytic Activity of Gold@Polydopamine Nanoreactors with Multi-Compartment Structure under NIR Irradiation

Shilin Mei1, Zdravko Kochovski1, Rafael Roa2, Sasa Gu3, Xiaohui Xu1, Hongtao Yu1, Joachim Dzubiella4, 5, Matthias Ballauff1, 6, Yan Lu1, 7, *

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Nano-Micro Lett. (2019) 11: 83

First Online: 10 October 2019 (Article)

DOI:10.1007/s40820-019-0314-9

*Corresponding author. E-mail: yan.lu@helmholtz-berlin.de (Yan Lu)

 

Abstract

 


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Photothermal conversion (PTC) nanostructures have great potential for applications in many fields and therefore they have attracted tremendous attention. However, the construction of a PTC nanoreactor with multi-compartment structure to achieve the combination of unique chemical properties and structural feature is still challenging due to the synthetic difficulties. Herein, we designed and synthesized a catalytically active, PTC gold (Au)@polydopamine (PDA) nanoreactors driven by infrared irradiation using assembled PS-b-P2VP nanosphere as soft template. The particles exhibit multi-compartment structure which is revealed by 3D electron tomography characterization technique. They feature permeable shells with tunable shell thickness. Full kinetics for the reduction reaction of 4-nitrophenol has been investigated using these particles as nanoreactors and compared with other reported systems. Notably, a remarkable acceleration of the catalytic reaction upon near-infrared irradiation is demonstrated, which reveals for the first time the importance of the synergistic effect of photothermal conversion and complex inner structure to the kinetics of the catalytic reduction. The ease of synthesis and fresh insights into catalysis will promote a new platform for novel nanoreactor studies.


 

Keywords

PS-b-P2VP; Polydopamine; Gold; Photothermal conversion; 3D tomography

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