2D Stranski–Krastanov growth of planar AuAg nano-dendrimers for enhanced visible-light plasmonic catalysis

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CrystEngComm, 2026, Advance ArticleDOI: 10.1039/D6CE00228E, PaperQiuxiang Sun, Xiangyu Tong, Xusheng Chen, Zhaoqiang Wang, Xiaohu Wu, Yanyun Ma, Yiqun ZhengPlasmonic AuAg nano-dendrimers act as efficient visible-light photocatalysts due to their unique branch…

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2D Stranski–Krastanov growth of planar AuAg nano-dendrimers for enhanced visible-light plasmonic catalysis

* Corresponding authors

a Jining Institute of Quality & Metrology Inspection, Jining, Shandong 272000, China

b Yangtze Laboratory, Wuhan 430205, China
E-mail: [email protected]

c College of Electromechanical Engineering, Qingdao University of Science and Technology, Qingdao, Shandong 266061, China

d School of Resource & Environment and Safety Engineering, Jining University, Qufu, Shandong 273155, China

e School of Integrated Circuits, Hubei University, Wuhan 430062, China

f Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory of Advanced Negative Carbon Technologies, Soochow University, Suzhou, Jiangsu 215123, China
E-mail: [email protected]

g School of Chemistry, Chemical Engineering, and Materials, Jining University, Qufu, Shandong 273155, China
E-mail: [email protected]

Abstract

Plasmonic bimetallic nanostructures with complex morphologies offer enhanced light-harvesting and catalytic properties. Herein, we report the one-pot synthesis of two-dimensional, dendrimer-shaped gold–silver (AuAg) bimetallic nanoparticles via ascorbic acid reduction with the presence of docosyltrimethylammonium chloride and hexamethylenetetramine in an ice-water bath. The synthesized nanoparticles feature a unique planar, branched morphology with arm lengths of approximately 50 nm and trunk diameters of ∼10 nm, as confirmed by electron microscopy. Owing to the localized surface plasmon resonance (LSPR) covering the visible region, we demonstrate their efficacy as plasmonic catalysts under low-power visible light irradiation (590 nm LED). In particular, enhanced catalytic activity was observed in a model reaction compared to dark conditions, which is attributed to the efficient generation and injection of hot electrons from the visible-light-excited plasmonic nanostructures. Finite element method (FEM) electromagnetic simulations corroborate that this specific morphology generates intense localized field enhancements at the branch tips and supports a strong plasmonic response tuned to the visible region. This work highlights the potential of morphologically engineered bimetallic nano-dendrimers as high-performance photocatalysts for sustainable chemistry driven by visible light.