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Peer-reviewedCC BY-NC 3.0Nanoscale Advances

pH-controlled reversible assembly of magnetic and plasmonic nanoparticles on gold nanorods

  • Mehedi H. Rizvi1
  • Ruosong Wang2
  • Jonas Schubert2
  • Amy L. Josefsberg3
  • Andreas Fery2,4
  • Joseph B. Tracy1
4 affiliations
  1. 1Department of Materials Science and Engineering, North Carolina State University Raleigh North Carolina 27695 USA
  2. 2Leibniz-Institut für Polymerforschung Dresden e.V., Institute for Physical Chemistry and Polymer Physics 01069 Dresden Germany
  3. 3Department of Physics and Astronomy, University of North Carolina Chapel Hill North Carolina 27599 USA
  4. 4Chair for Physical Chemistry of Polymeric Materials, Technische Universität Dresden 01062 Dresden Germany
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Abstract

Overcoating gold nanorods (GNRs) with plasmonic or magnetic satellite nanoparticles (NPs) can modify the longitudinal and transverse localized surface plasmon resonance (LSPR and TSPR) through coupling with the satellite NPs. We report the use of electrostatic interactions to reversibly assemble different types and amounts of satellite NPs on GNR cores, which allows coupling with and manipulation of the LSPR and TSPR of the GNR core. Positively charged Fe3O4 NPs and spherical gold NPs (GNPs) functionalized with polyethylenimine (PEI) were assembled on the surface of negatively charged GNRs functionalized with bovine serum albumin (BSA). The distinct optical extinction spectra of Fe3O4 NPs and GNRs make straightforward quantification of the loading of satellite NPs possible. Successive overcoatings on GNRs with GNPs followed by Fe3O4 NPs are also demonstrated. pH is a useful parameter for controlling the assembly and loading of satellite NPs because the surface potentials on PEI- and BSA-functionalized NPs strongly depend on pH. The highest loading of satellite NPs is obtained at a pH of 10.8, which is near the isoelectric point (pHI) of PEI (pHI ∼11). Adjusting the pH to much higher or lower values below the pHI of BSA (pHI ∼5) drives disassembly. As a demonstration of the effect of disassembly, diattenuation of transmitted light is observed when GNRs coated with Fe3O4 NPs align in a magnetic field but vanish upon the removal of Fe3O4 NPs, randomizing the orientations of the GNRs.

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Cite

BibTeXRIS
BibTeX
@article{rizvi2026phcontrolled,
  title = {{pH-controlled reversible assembly of magnetic and plasmonic nanoparticles on gold nanorods}},
  author = {Mehedi H. Rizvi and Ruosong Wang and Jonas Schubert and Amy L. Josefsberg and Andreas Fery and Joseph B. Tracy},
  journal = {Nanoscale Advances},
  year = {2026},
  month = aug,
  doi = {10.1039/d6na00497k},
  url = {https://doi.org/10.1039/d6na00497k},
  note = {CC BY-NC 3.0},
}
RIS
TY  - JOUR
TI  - pH-controlled reversible assembly of magnetic and plasmonic nanoparticles on gold nanorods
AU  - Mehedi H. Rizvi
AU  - Ruosong Wang
AU  - Jonas Schubert
AU  - Amy L. Josefsberg
AU  - Andreas Fery
AU  - Joseph B. Tracy
PY  - 2026
DA  - 2026/08/24
JO  - Nanoscale Advances
DO  - 10.1039/d6na00497k
UR  - https://doi.org/10.1039/d6na00497k
AB  - Overcoating gold nanorods (GNRs) with plasmonic or magnetic satellite nanoparticles (NPs) can modify the longitudinal and transverse localized surface plasmon resonance (LSPR and TSPR) through coupling with the satellite NPs. We report the use of electrostatic interactions to reversibly assemble different types and amounts of satellite NPs on GNR cores, which allows coupling with and manipulation of the LSPR and TSPR of the GNR core. Positively charged Fe3O4 NPs and spherical gold NPs (GNPs) functionalized with polyethylenimine (PEI) were assembled on the surface of negatively charged GNRs functionalized with bovine serum albumin (BSA). The distinct optical extinction spectra of Fe3O4 NPs and GNRs make straightforward quantification of the loading of satellite NPs possible. Successive overcoatings on GNRs with GNPs followed by Fe3O4 NPs are also demonstrated. pH is a useful parameter for controlling the assembly and loading of satellite NPs because the surface potentials on PEI- and BSA-functionalized NPs strongly depend on pH. The highest loading of satellite NPs is obtained at a pH of 10.8, which is near the isoelectric point (pHI) of PEI (pHI ∼11). Adjusting the pH to much higher or lower values below the pHI of BSA (pHI ∼5) drives disassembly. As a demonstration of the effect of disassembly, diattenuation of transmitted light is observed when GNRs coated with Fe3O4 NPs align in a magnetic field but vanish upon the removal of Fe3O4 NPs, randomizing the orientations of the GNRs.
SN  - 2516-0230
ER  -