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Related Concept Videos

Photoluminescence: Applications01:14

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...
Variables Affecting Phosphorescence and Fluorescence01:26

Variables Affecting Phosphorescence and Fluorescence

Fluorescence and phosphorescence are essential phenomena in fields like analytical chemistry, biological imaging, and materials science, where they detect molecular properties and visualize cellular structures. Understanding the variables that influence these luminescent behaviors is crucial for maximizing accuracy and efficiency in their applications. These variables can broadly be grouped into chemical structure, solvent properties, and external conditions, each playing a distinct role in...
Photoluminescence: Fluorescence and Phosphorescence01:23

Photoluminescence: Fluorescence and Phosphorescence

Photoluminescence is a process where a molecule absorbs light energy and re-emits it in the form of light. This phenomenon occurs when a substance absorbs photons, promoting its electrons to higher energy level excited states, followed by a relaxation process in which the electrons return to their original ground state energy levels and emit light. Photoluminescence is widely observed in various materials, including semiconductors, and organic and inorganic compounds.
A pair of electrons in a...

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Updated: May 19, 2026

Compact Quantum Dots for Single-molecule Imaging
17:14

Compact Quantum Dots for Single-molecule Imaging

Published on: October 9, 2012

Quantum dot-containing polymer particles with thermosensitive fluorescence.

Alla N Generalova1, Vladimir A Oleinikov, Alyona Sukhanova

  • 1Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, 117997 Moscow, Russian Federation.

Biosensors & Bioelectronics
|August 14, 2012
PubMed
Summary
This summary is machine-generated.

New composite polymer particles with quantum dots offer a reversible temperature-sensitive fluorescence response. These smart materials can function as local temperature sensors and carriers for biomolecules in biosensing applications.

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Production and Targeting of Monovalent Quantum Dots
10:16

Production and Targeting of Monovalent Quantum Dots

Published on: October 23, 2014

Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Nanotechnology

Background:

  • Thermosensitive polymers exhibit tunable properties with temperature changes.
  • Semiconductor quantum dots (QDs) offer unique optical properties for sensing.
  • Integrating QDs into responsive polymer matrices enables novel sensor platforms.

Purpose of the Study:

  • To fabricate composite polymer particles with a thermosensitive shell doped with QDs.
  • To investigate the temperature-dependent fluorescence response of the composite particles.
  • To evaluate the potential of these particles as local temperature sensors and biomolecule carriers.

Main Methods:

  • Fabrication of poly(acrolein-co-styrene) core/poly(N-vinylcaprolactam) shell composite particles.
  • Doping the polymer shell with CdSe/ZnS semiconductor quantum dots.
  • Characterization of particle size and fluorescence properties as a function of temperature.
  • Assembly of particles with protein molecules to assess biomolecule compatibility.

Main Results:

  • Composite particles showed a decrease in hydrodynamic diameter above the lower critical solution temperature of PVCL.
  • Quantum dot fluorescence intensity exhibited a reversible, temperature-dependent response.
  • The fluorescence sensitivity was linked to temperature-induced changes in QD spacing within the polymer shell.
  • Assembled particles retained thermosensitive fluorescence properties, demonstrating compatibility with biomolecules.

Conclusions:

  • Developed composite particles act as effective local temperature sensors with reversible optical output.
  • The particles can serve as carriers for biomolecules, maintaining their thermosensitive functionality.
  • These QD-doped, thermosensitive particles hold promise for biosensing and optical detection schemes.