NanoDay 2021 – Poster 12 – Chenlu Yang


Synthesis of AuNR@Ag Cuboids with Thin Silica Coating

Chenlu Yang

Authors: Chenlu Yang, Yong Zeng

Faculty Mentor: Yong Zeng, PhD

College: College of Liberal Arts and Sciences

Department: Chemistry


Plasmonic nanoparticles are excellent candidates in the interdisciplinary areas that cover the topics related to spectroscopy, biomedicine, and solar energy harvesting due to their unique optical properties. Especially, gold nanorods, which can strongly absorb and scatter light in the visible to near-infrared range of the electromagnetic spectrum through localized surface plasmon resonance (LSPR), are attractive owing to their chemical stability, finely tailored, and facile surface modification. On the other hand, Ag can exhibit much stronger electric field enhancements and have great performance in the enhancement of Raman scatter and fluorescence signals. (Au core)-(Ag shell) nanorods are developed and can exhibit superior optical properties. AuNR@Ag cuboids are synthesized with uniform morphology and then coated by silica shell via the co-polymerization process. The siloxane copolymer not only preserves the optical properties, but also improves the biocompatibility. Here, we demonstrate a facile, robust and in-situ method for silica coating on surface of AuNR@Ag cuboids with 5 nm shell thickness and highly suppressed formation of core-free nanoparticles. This method offers great advantages to the challenges on the aggregation of nanoparticles via silica coating, achieves precise regulation of the silica thickness and introduces functional groups (-NH2) in the fabrication of core−shell NPs. We hope this work could provide significant insights into the surface medication of various nanoparticles as our results are very easy, robust, and highly reproducible.