Issue 11, 2022

Thermoresponsive chiral plasmonic nanoparticles


Chiral metallic nanoparticles can exhibit novel plasmonic circular dichroism (PCD) in the ultraviolet and visible range of the electromagnetic spectrum. Here, we investigate how thermoresponsive dielectric nanoenvironments will influence such PCD responses through poly(N-isopropylacrylamide) (PNIPAM) modified chiral gold nanorods (AuNRs). We observed the temperature-dependent chiral plasmonic responses distinctly from unmodified counterparts. As for the modified systems, the PCD peaks for both L-AuNRs and D-AuNRs at 50 °C red shifted simultaneously with enhanced intensities compared to the results at 20 °C. In contrast, the unmodified L-AuNRs and D-AuNRs exhibited no peak shift with reduced intensities. Subsequent simulation and experimental studies demonstrated that the enhanced PCD was attributed to PNIPAM chain collapse causing the increase of the refractive index by expelling minute water out of the corona surrounding chiral plasmonic AuNRs. Notably, such thermoresponsive chiral plasmonic responses are reversible, general, and extendable to other types of chiral plasmonic nanoparticles.

Graphical abstract: Thermoresponsive chiral plasmonic nanoparticles

Supplementary files

Article information

Article type
20 Dec 2021
14 Feb 2022
First published
17 Feb 2022

Nanoscale, 2022,14, 4292-4303

Thermoresponsive chiral plasmonic nanoparticles

Y. Liu, T. Perera, Q. Shi, Z. Yong, S. Mallawaarachchi, B. Fan, J. A. Walker, C. J. Lupton, S. H. Thang, M. Premaratne and W. Cheng, Nanoscale, 2022, 14, 4292 DOI: 10.1039/D1NR08343K

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