Mixed-ligand gold nanorod–graphene oxide hybrids: Surface engineering and LSPR response
Abstract
Gold nanorods (AuNRs) are widely investigated for localized surface plasmon resonance (LSPR) sensing, yet their application is often limited by the compromise between colloidal stability and near-field accessibility. In this work, we propose a mixed-ligand grafting strategy to engineer the surface of gold nanorods and balance these two parameters. Functionalization with a high L-cysteine (L-Cys)-to-PEG10k feed ratio was employed to ensure nanoparticle stability while limiting distance-induced attenuation of the plasmonic near field. The ability of the functionalized gold nanorods to respond to changes in their local dielectric environment was evidenced using graphene oxide (GO) as a surrounding medium through a measurable shift in the LSPR peak position. Importantly, this approach differs from conventional AuNRs–GO composites by relying on the adsorption of small monolayer GO sheets onto gold nanorods rather than the deposition of gold nanorods onto large graphene oxide substrates.
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BibTeX
@article{liu2026mixedligand,
title = {{Mixed-ligand gold nanorod–graphene oxide hybrids: Surface engineering and LSPR response}},
author = {Leya Liu and Julien Boudon and Thomas Girardet and Lucien Saviot and Olivier Heintz and Nadine Millot},
journal = {Materials Science and Engineering: B},
year = {2026},
month = oct,
doi = {10.1016/j.mseb.2026.119932},
url = {https://hal.science/hal-05820647v1},
note = {CC BY 4.0},
}
RIS
TY - JOUR
TI - Mixed-ligand gold nanorod–graphene oxide hybrids: Surface engineering and LSPR response
AU - Leya Liu
AU - Julien Boudon
AU - Thomas Girardet
AU - Lucien Saviot
AU - Olivier Heintz
AU - Nadine Millot
PY - 2026
DA - 2026/10/18
JO - Materials Science and Engineering: B
DO - 10.1016/j.mseb.2026.119932
UR - https://hal.science/hal-05820647v1
AB - Gold nanorods (AuNRs) are widely investigated for localized surface plasmon resonance (LSPR) sensing, yet their application is often limited by the compromise between colloidal stability and near-field accessibility. In this work, we propose a mixed-ligand grafting strategy to engineer the surface of gold nanorods and balance these two parameters. Functionalization with a high L-cysteine (L-Cys)-to-PEG10k feed ratio was employed to ensure nanoparticle stability while limiting distance-induced attenuation of the plasmonic near field. The ability of the functionalized gold nanorods to respond to changes in their local dielectric environment was evidenced using graphene oxide (GO) as a surrounding medium through a measurable shift in the LSPR peak position. Importantly, this approach differs from conventional AuNRs–GO composites by relying on the adsorption of small monolayer GO sheets onto gold nanorods rather than the deposition of gold nanorods onto large graphene oxide substrates.
SN - 0921-5107
SN - 1873-4944
ER -