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Photoluminescence: Applications

Photoluminescence: Applications

Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...

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Synthesis, Cellular Delivery and In vivo Application of Dendrimer-based pH Sensors

Synthesis, Cellular Delivery and In vivo Application of Dendrimer-based pH Sensors

Published on: September 10, 2013

Nanodiamond surface as a photoluminescent pH sensor.

Yaraslau Padrez¹, Lena Golubewa^1,2, Anastasiya Bahdanava¹

¹Department of Molecular Compounds Physics, State research institute Center for Physical Sciences and Technology, Vilnius, Lithuania.

|February 6, 2023

Summary

Highly homogeneous nanodiamonds (NDs) exhibit excitation-wavelength-dependent photoluminescence (PL) due to surface structures. These NDs show pH sensitivity, making them potential all-optical sensors for various applications.

Keywords:

nanodiamonds oxygen-containing groups pH sensing photoluminescence surface chemistry

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Area of Science:

Materials Science
Nanotechnology
Spectroscopy

Background:

Nanodiamonds (NDs) are carbon nanoparticles with a cubic nanodiamond (ND) core and a disordered sp2 shell.
Surface functionalization with oxygen-containing groups influences ND properties.
Photoluminescence (PL) in nanomaterials is sensitive to surface chemistry and environmental factors.

Purpose of the Study:

To systematically characterize the photoluminescence (PL) properties of nanodiamonds (NDs) with specific surface functionalization.
To investigate the influence of excitation wavelength, concentration, and pH on ND PL.
To evaluate the potential of NDs as all-optical pH sensors.

Main Methods:

Spectroscopic characterization of nanodiamond suspensions.
Photoluminescence (PL) measurements across various excitation wavelengths.
Assessment of PL dependence on ND concentration and environmental pH (2-11).

Main Results:

Nanodiamonds (NDs) exhibited excitation-wavelength-dependent photoluminescence (PL) attributed to hydroxyl, ketone, carboxylic anhydride, and carboxyl groups.
PL properties were concentration-dependent, indicating a tendency for NDs to agglomerate.
ND PL showed strong sensitivity to pH variations within the 2-11 range.

Conclusions:

The study identified specific surface structures responsible for the observed photoluminescence in nanodiamonds (NDs).
Nanodiamonds (NDs) demonstrate significant pH sensitivity, enabling their use as all-optical sensors.
These findings support the potential application of NDs for localized pH sensing in fields like bioimaging and therapeutics.