Issue 32, 2015 - Xi'an Jiaotong University prepared novel core-shell nanosheet materials

Recently, the research group of Gao Chuanbo of Xi'an Jiaotong University has made new progress
in the design and synthesis of precious metal nanomaterials.

The controlled preparation of gold nanocrystals with regular morphology is an important challenge
in the field of nanomaterial synthesis.
Due to the diversity of morphology and the controllability of preparation, the epitaxial growth of gold can be used as a template
to achieve gold nanocrystals.
However, due to the occurrence of displacement reactions, only nanomaterials
with hollow structures can usually be obtained.

In the study, researchers took silver nanosheets as an example to inhibit the occurrence of displacement reaction by introducing coordination, realize the epitaxial growth of gold on the silver surface, and finally form a novel "quasi-gold" nanosheet material
with core-shell structure.

The material exhibits excellent stability and optical activity, and has good application prospects
in the fields of molecular detection, biosensing and imaging.
This synthesis strategy provides a general method for depositing precious metals on the surface of active metals, and provides new ideas
for the design and synthesis of functional precious metal nanomaterials and the preparation of corrosion resistant protective layers of active metals.
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