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Updated: Nov 7, 2025

Construction and Operation of a Light-driven Gold Nanorod Rotary Motor System

Construction and Operation of a Light-driven Gold Nanorod Rotary Motor System

Published on: June 30, 2018

Measuring the order parameter of vertically aligned nanorod assemblies.

Jeongmo Kim¹, Khalid Lahlil¹, Thierry Gacoin¹

¹Laboratoire de Physique de la Matière Condensée, CNRS, École Polytechnique, Institut Polytechnique de Paris, 91128 Palaiseau, France. thierry.gacoin@polytechnique.edu jong-wook.kim@polytechnique.edu.

|April 30, 2021

Summary

We developed a new, rapid method to measure nanorod assembly orientation using photoluminescence. This technique allows for in situ, non-destructive analysis, optimizing nanostructure development and device performance.

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Last Updated: Nov 7, 2025

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Area of Science:

Materials Science
Nanotechnology
Optics

Background:

Vertically aligned nanorod assemblies are crucial for anisotropic properties and device applications.
Accurate measurement of homeotropic order parameter (Shomeo) is vital for optimizing these assemblies.
Existing methods for Shomeo characterization lack speed, in situ capability, and non-destructive analysis.

Purpose of the Study:

To develop a novel, rapid, in situ, and non-destructive method for determining the homeotropic order parameter (Shomeo) of nanorod assemblies.
To utilize the unique photoluminescence properties of lanthanide-doped nanorods for structural analysis.
To demonstrate the method's effectiveness in dynamic states and under external field control.

Main Methods:

Employing lanthanide-doped crystalline nanorods with unique photoluminescence behavior.
Analyzing the nanorod assembly's structural information from the emission spectrum.
Demonstrating rapid in situ determination of Shomeo for Eu3+-doped NaYF4 nanorods under an electric field.
Utilizing conventional fluorescence microscopy without polarization considerations.

Main Results:

Successfully demonstrated a novel photoluminescence-based method for Shomeo determination.
Achieved rapid and in situ measurement of nanorod assembly orientation.
Showcased the method's applicability to Eu3+-doped NaYF4 nanorods controlled by an electric field.
Validated a non-destructive approach for analyzing assembled nanostructures.

Conclusions:

The proposed photoluminescence method offers a significant advancement for characterizing nanorod assemblies.
This technique enables in-depth examination of various assembled nanostructures and their dynamics.
The methodology facilitates optimization of assembly processes and enhances functional device performance.