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Photoluminescence: Applications01:14

Photoluminescence: Applications

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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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Plasmonic Elastic Capsules as Colorimetric Reversible pH-Microsensors.

Céline Burel1, Alexandre Teolis1, Ahmed Alsayed1

  • 1Complex Assemblies of Soft Matter Laboratory (COMPASS), UMI 3254, CNRS-Solvay-University of Pennsylvania, RIC, Bristol, PA, 19007, USA.

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Summary
This summary is machine-generated.

New pH-sensitive "plasmocapsules" offer a breakthrough in early damage detection. These reusable microsensors, made from gold nanoparticles and pH-responsive shells, provide a simple, cost-effective solution for monitoring local pH changes.

Keywords:
bacteriamicrocapsulesnanoparticlespH-sensorsplasmonics

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Chemical Sensing

Background:

  • Effective microsensors are needed to detect local pH changes, preventing irreversible damage from demineralization, corrosion, or biofilms.
  • Existing molecular dye-based sensors are costly, prone to leakage, and susceptible to photobleaching.
  • Plasmonic nanoparticle-based sensors face challenges in assembly and dispersibility.

Purpose of the Study:

  • To develop easily dispersible, pH-sensitive colloidal microsensors.
  • To overcome the limitations of current pH sensing technologies.
  • To introduce a novel class of sensing materials for early damage detection and bacterial growth monitoring.

Main Methods:

  • Combining optically active plasmonic gold nanoparticles with pH-responsive thin shells to create "plasmocapsules."
  • Utilizing the distance-dependent plasmonic properties of gold nanoparticles within a responsive matrix.
  • Fabricating billions of micron-size, reusable sensors.

Main Results:

  • Plasmocapsules exhibit unambiguous color changes in response to pH variations due to swelling or shrinking of the shells.
  • The developed sensors are easily fabricated, nonintrusive, reusable, and operate over a large pH range.
  • The potential for detecting bacterial growth using these plasmocapsules was successfully demonstrated.

Conclusions:

  • Plasmocapsules represent a new class of pH-sensitive sensing materials.
  • This technology offers a cost-effective and efficient solution for early detection of local pH changes and potential contamination.
  • The findings pave the way for broader applications in materials science and environmental monitoring.