Site-specific growth of gold nanoparticles on Bismuth Selenide hexagonal nanoplates

Wenjia Xu; Shuaibin Li; Jin Ji; Hongyu Chen; Yuhua Feng

doi:10.1016/j.jcis.2023.06.138

Site-specific growth of gold nanoparticles on Bismuth Selenide hexagonal nanoplates

J Colloid Interface Sci. 2023 Nov:649:826-831. doi: 10.1016/j.jcis.2023.06.138. Epub 2023 Jun 21.

Authors

Wenjia Xu¹, Shuaibin Li², Jin Ji², Hongyu Chen², Yuhua Feng³

Affiliations

¹ Institute of Advanced Synthesis, School of Chemistry and Molecular Engineering, Nanjing Tech University, Nanjing 211816, PR China; School of Physical and Mathematical Science, Nanjing Tech University, Nanjing 211816, PR China.
² Institute of Advanced Synthesis, School of Chemistry and Molecular Engineering, Nanjing Tech University, Nanjing 211816, PR China.
³ Institute of Advanced Synthesis, School of Chemistry and Molecular Engineering, Nanjing Tech University, Nanjing 211816, PR China. Electronic address: ias_yhfeng@njtech.edu.cn.

PMID: 37390530
DOI: 10.1016/j.jcis.2023.06.138

Abstract

Highly site-specific growth of gold nanoparticles (AuNPs) on Bismuth Selenide (Bi₂Se₃) hexagonal nanoplates was achieved by fine-tuning the growth kinetics of Au through controlling the coordination number of the Au ion in MBIA-Au³⁺ complex. With increasing concentration of MBIA, the increased amount and the coordination number of the MBIA-Au³⁺ complex results in the decrease of the reduction rate of Au. The slowed growth kinetics of Au allowed the recognition of the sites with different surface energy on the anisotropic Bi₂Se₃ hexagonal nanoplates. As a result, the site-specific growth of AuNPs at the corner, the edge, and the surface of the Bi₂Se₃ nanoplates were successfully achieved. This way of growth kinetic control was proven to be effective in constructing well-defined heterostructures with precise site-specificity and high purity of the product. This is helpful for the rational design and controlled synthesis of sophisticated hybrid nanostructures and would eventually promote their applications in various fields.

Keywords: Bi(2)Se(3)-Au; Complexation; Growth kinetics; Hybrid nanostructure; Seeded growth; Site-specificity.