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Erratum: Flores, J., et al. Effective Parameters for 1D Photonic Crystals with Isotropic and Anisotropic Magnetic Inclusions: Coherent Wave Homogenization Theory. <i>Materials</i> 2020, <i>13</i>, 1475.

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Updated: Mar 22, 2026

Thermal Measurement Techniques in Analytical Microfluidic Devices

Thermal Measurement Techniques in Analytical Microfluidic Devices

Published on: June 3, 2015

Si-nanocrystal-based nanofluids for nanothermometry.

M A Cardona-Castro¹, A Morales-Sánchez, L Licea-Jiménez

¹Centro de Investigación en Materiales Avanzados S. C. Unidad Monterrey, Alianza Norte # 202, Autopista Monterrey-Aeropuerto Km.10., C.P. 66628 Apodaca, Nuevo León, Mexico.

|April 30, 2016

Summary

Researchers studied oxidized silicon nanocrystals (Si-NCs) in alcohol nanocolloids. The liquid

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Area of Science:

Nanotechnology
Materials Science
Physical Chemistry

Background:

Accurate nanoscale temperature measurement is crucial for technological advancement.
Photoluminescent nanoparticles and nanocolloids are promising for nanoscale thermometry.
The impact of surrounding liquids on the low-temperature photoluminescence of oxidized silicon nanocrystals (Si-NCs) remains unexplored.

Purpose of the Study:

To investigate the influence of surrounding liquid dielectric properties on the cryogenic photoluminescence (PL) of oxidized Si-NCs.
To analyze the underlying mechanisms causing PL shifts in Si-NCs within alcohol nanocolloids.
To identify parameters for engineering photoluminescent nanofluids for nanoscale temperature sensing.

Main Methods:

Measurement of photoluminescence (PL) from oxidized Si-NCs in monohydric alcohol nanocolloids.
Systematic variation of temperature and alcohol molecule length (influencing dielectric properties).
Analysis of emission peak shifts in relation to temperature and liquid dielectric constant.

Main Results:

A progressive blue shift in the emission peak was observed with decreasing temperature.
This blue shift is dependent on both temperature and the dielectric properties of the surrounding alcohol.
The dielectric constant of the embedding liquid plays a significant role in the observed PL behavior.

Conclusions:

The study reveals the critical role of the surrounding liquid's dielectric properties on the cryogenic behavior of Si-NCs.
Observed PL shifts are attributed to thermal bandgap changes, quantum confinement, and liquid polarization effects.
Findings provide fundamental insights into photoluminescent nanocolloids and enable PL tuning for nanoscale temperature sensing applications.