Concave pentagonal gold-silver nanobipyramids, preparation method and application thereof
By preparing concave pentagonal gold-silver nanopyramids, the problem of insufficient SERS enhancement performance of anisotropic gold nanomaterials was solved, achieving high-sensitivity and stable SERS detection, which is suitable for trace molecule detection and biosensing.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- XI AN JIAOTONG UNIV
- Filing Date
- 2026-04-28
- Publication Date
- 2026-07-17
AI Technical Summary
Existing anisotropic gold nanomaterials have insufficient enhancement performance in surface-enhanced Raman scattering (SERS) detection, affecting detection sensitivity and stability.
Concave pentagonal gold-silver bipyramidal nanoparticles were prepared by adding chloroauric acid, ascorbic acid, silver nitrate and hexadecyltrimethylammonium chloride to the growth solution to control the liquid-phase growth of gold bipyramidal nanoparticle seeds, forming a structure with pentagonal pyramids at both ends and a concave middle surface, thereby regulating its crystal planes and morphology.
The concave pentagonal gold-silver nanobipyramidal nanoparticles exhibit a SERS enhancement factor of 7.12×10⁶ for rhodamine-based dyes under 633 nm laser excitation, with a minimum detection concentration as low as 10⁻⁹ M. They demonstrate stable signals and high detection sensitivity, making them suitable for trace molecule detection and biosensing.
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Figure CN122400549A_ABST