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One‐Pot Synthesis of Hat‐like PdAu Alloy Open Nanostructures with Improved Oxidase‐like Activities

Von Wiley-VCH zur Verfügung gestellt

Hat-like open nanostructures of palladium-gold (PdAu) alloy with the building block of nanosheet are readily prepared via the co-reduction of Au/Pd precursors in the presence of octadecyltrimethylammonium chloride and glutathione in an ice-water bath, showing an enhanced oxidase-like activity for the colorimetric detection of H2O2 as compared to wire-like and quasi-spherical counterparts.


Abstract

Controlled assembly of two-dimensional (2D) noble metal nanocrystals into three-dimensional (3D) open architecture with reasonable interparticle distance is of great value to solve the re-stacking issue for practical application, which yet achieves limited progress for bimetallic nanocrystals. Herein, we report the synthesis of hat-like palladium-gold (PdAu) alloy nanocrystals with the building block of nanosheet and explored their catalytic properties when serving as oxidase-like nanoenzyme. The success of current synthesis lies on the co-reduction of Au and Pd precursors under kinetics-controlled condition, together with the use of glutathione molecules as the shape-directing agent. The use of OTAC as capping agent is crucial for the unique morphology, where wire-like and quasi-spherical products are obtained, respectively, when the capping agent is replaced by CTAB and CTAC, respectively. Systematic investigations reveal that the oxidase-like activities of these PdAu nanocrystals are highly morphology-dependent. In particular, the PdAu alloy nanohats displayed the highest oxidase-like activity, as well as a wide linear range (100–5000 μM) and low detection limit (25 μM). The present study drives the development of synthetic strategies that allows the construction of 2D bimetallic nanocrystals with a 3D open structure, and validates their improved performance as nanoenzyme towards practical sensing applications, which may find important use in the rational design of biocatalysis, bioassays, and nano-biomedicine.

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