Pyroelectric synthesis of Au/Pt bimetallic nanoparticles-BaTiO3 hybrid nanomaterials.

Liren Wang,Yanming Liu,Xinyu Wang,Benwei Fu,Han Wang,Peng Tao,Wen Shang,Tao Deng,Chengyi Song

doi:10.1039/d0ra00648c

Liren Wang, Yanming Liu + Show 7 more

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https://doi.org/10.1039/d0ra00648c

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Journal: RSC advances	Publication Date: Jan 1, 2020
Citations: 3	License type: CC BY 3.0

Affiliation: Shanghai Jiao Tong University

Abstract

This paper introduces an approach to synthesize bimetallic nanoparticles under an alternating temperature field in aqueous solution. During the synthesis, pyro-catalytic barium titanate is used as the substrate to reduce the metallic ions dispersed in the solution due to the generated charges at the surface of pyro-materials under temperature oscillation. Chloroauric acid and potassium tetrachloroplatinate are used as precursors to produce gold/platinum bimetallic nanoparticles through a pyro-catalytic process. Transmission electron microscopy characterization, in combination with energy dispersive X-ray spectroscopy mapping, demonstrates that the bimetallic nanoparticle is composed of an Au core and Au/Pt alloy shell structure. Compared to the conventional approaches, the pyroelectric synthesis approach demonstrated in this work requires no toxic reducing agents and waste heat can be used as a thermal energy source in the synthesis. Hence, it offers a potential “green” synthetic method for bimetallic nanoparticles.

Highlights

IntroductionBimetallic nanoparticles (NPs) have received wide attraction due to their electrical and optical properties, and their applications in catalysis.[1,2,3,4,5,6,7,8] Over the past decades, the synthesis of bimetallic NPs with different structures has gained much attention, and signi cant efforts have been made in controlling the composition, size and morphology via various synthetic processes.[9,10] Conventional methods for the preparation of bimetallic NPs can be divided into two categories: physical[11] and chemical techniques.[12,13,14] The typical colloidal route is the most widely adopted strategy,[12,13,14] which requires the reduction of metal ions into neutral atoms followed by the deposition of metallic atoms onto the growing particles
We have demonstrated that barium titanate (BaTiO3, BTO) NPs could be served as pyroelectric support to synthesize different metallic NPs (e.g. Au, Pt, Pd NPs) in aqueous solution or organic solvent.[21]
We explored the synthesis of BTO–Au/Pt hybrid nanomaterials in aqueous solution under temperature alternation (Fig. 1)

Summary

Introduction

Bimetallic nanoparticles (NPs) have received wide attraction due to their electrical and optical properties, and their applications in catalysis.[1,2,3,4,5,6,7,8] Over the past decades, the synthesis of bimetallic NPs with different structures has gained much attention, and signi cant efforts have been made in controlling the composition, size and morphology via various synthetic processes.[9,10] Conventional methods for the preparation of bimetallic NPs can be divided into two categories: physical[11] and chemical techniques.[12,13,14] The typical colloidal route is the most widely adopted strategy,[12,13,14] which requires the reduction of metal ions into neutral atoms followed by the deposition of metallic atoms onto the growing particles. Au/Pt NPs are one of the most important types of bimetallic NPs because of their special catalytic properties. The synthesis of bimetallic Au/Pt NPs, is a signi cant challenge as Au is hard to be miscible with Pt.[15] In addition, the traditional synthesis approach involves the use of some organic reductants and stabilizers, which are usually toxic and expensive.[16]

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