# Silicon-Silica Core-Shell Particles Synthesis for Directional Light Scattering

Maelys Hanna-Peant, Emmanuel O. Idowu, Antoine Azéma, Dalin Soun, Abbie Rubletz, Sabrina Lacomme, Aurelien Cuche, Peter Wiecha, Jonathan G.-C. Veinot, Lucien Roach, et al.

<figure><img src="image_1.png" /></figure>

To cite this version:

Maelys Hanna-Peant, Emmanuel O. Idowu, Antoine Azéma, Dalin Soun, Abbie Rubletz, et al. Silicon-Silica Core-Shell Particles Synthesis for Directional Light Scattering. AFuN25 International School on Advanced Functional Nanomaterials, Sep 2025, Palerme, Italy. hal-05313355

HAL Id: hal-05313355

https://hal.science/hal-05313355v1

Submitted on 14 Oct 2025

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## Synthesis for Directional Light Scattering

Maëlys Hanna-Péant<sup>A</sup>, Emmanuel O. Idowu<sup>B</sup>, Antoine Azéma<sup>C,D</sup>, Dalin Soun<sup>D</sup>, Abbie Rubletz<sup>E</sup>, Sabrina Lacomme<sup>F</sup>, Aurélien Cuche<sup>C</sup>, Peter R. Wiecha<sup>D</sup>, Jonathan G. C. Veinot<sup>E</sup>, Lucien Roach<sup>A</sup>, Glenna L. Drisko<sup>A</sup>

### Context

<figure><img src="image_3.png" /><figcaption>Forward light scattering</figcaption></figure>

<figure><img src="image_4.png" /></figure>

<figure><img src="image_5.png" /></figure>

### Experimental Work

**Silicon core synthesis<fnref n="3" />:**

<figure><img src="image_6.png" /></figure>

**Silica shell synthesis<fnref n="4" />:**

<figure><img src="image_7.png" /></figure>

### Results

#### Particle Evolution

<figure><img src="image_8.png" /><figcaption>Silicon cores,
Diameter ~ 172 nm
Shell ~ 2 nm</figcaption></figure>

<caption>First regrowth,
~ 204 nm
~ 16 nm</caption>

<caption>Second regrowth,
~ 406 nm
~ 117 nm</caption>

#### Size Distribution

<figure><img src="image_9.png" /></figure>

#### Elemental mapping

<figure><img src="image_10.png" /></figure>

#### Brightfield TEM

<figure><img src="image_11.png" /></figure>

#### SINGLE PARTICLE BACKSCATTER SPECTROSCOPY

##### Mie Theory

<figure><img src="image_12.png" /></figure>

##### Experimental

<figure><img src="image_13.png" /></figure>

<figure><img src="image_14.png" /></figure>

### Conclusions

* ✓ Si@SiO₂ core-shells synthesized

* ✓ Controllable shell thickness

* ✓ Shell reduces backscatter

* ✓ Spectra agree with theory

* ✗ Low particle yield

### Perspectives

* Measure forward scattering of Si@SiO₂

* Calculate forward-to-backward scattering ratio

* Correlate core-shell geometry with spectra

* Investigate other dielectric shells (ZrO₂, TiO₂ ...)

<footnote>A Université de Lyon, ENS Lyon, CNRS, F69342 Lyon, France</footnote>

<footnote>B Université de Bordeaux, ICMCB, CNRS, 33608 Pessac, France</footnote>

<footnote>C Université de Toulouse, CEMES, CNRS, 31055 Toulouse, France</footnote>

<footnote>D Université de Toulouse, LAAS, CNRS, 31400 Toulouse, France</footnote>

<footnote>E Alberta University, CCIS 4-254, Edmonton, Alberta, Canada</footnote>

<footnote>F Bordeaux Imaging Center, UAR 3420 F-33600 Pessac, France</footnote>

<footnote n="1">1) Tsuchimoto et al. Opt. Express, 2016</footnote>

<footnote n="2">2) DockWire News, 2023</footnote>

<footnote n="3">3) Cibaka-Ndaya et al. Chem. Mater., 2023</footnote>

<footnote n="4">4) Klein et al. Mater. Manufac. Process., 1994</footnote>

<footnote n="5">5) Soun et al. Opt. Express, 2025</footnote>