Related Experiment Video
Updated: Aug 7, 2026
08:35
Luminescence Lifetime Imaging of O2 with a Frequency-Domain-Based Camera System
Published on: December 16, 2019
Fluorescence Microscopy Study of Heterogeneity in Polymer-supported Luminescence-based Oxygen Sensors
1Department of Chemistry, University of Virginia, McCormick Road, Charlottesville, VA 22904-4319
Summary
This study uses fluorescence microscopy to analyze polymer-supported oxygen sensors. It reveals microheterogeneous regions with different oxygen quenching properties, likely due to sensor molecule crystallization.
Area of Science:
- Polymer Science
- Photophysics
- Analytical Chemistry
Background:
- Fluorescence microscopy is primarily used for biological studies.
- Polymer-supported luminescence-based oxygen sensors have significant potential.
- Understanding sensor molecule behavior within polymer supports is crucial.
Purpose of the Study:
- To demonstrate the utility of fluorescence microscopy for studying polymer-supported oxygen sensors.
- To investigate the photophysical properties and oxygen quenching behavior of sensor molecules.
- To identify the origins of heterogeneity in sensor response.
Main Methods:
- Design and implementation of a fluorescence imaging system.
- Development of measurement protocols for sensor systems.
- Analysis of fluorescence microscopic images to assess luminescence and oxygen quenching.
Main Results:
- Identified microheterogeneous regions within sensor films with varying luminescence intensity and oxygen quenching.
- Observed direct evidence of differing oxygen quenching properties of sensor molecules in polymer domains.
- Linked micro- and nano-crystallization of sensor molecules to heterogeneous responses and nonlinear Stern-Volmer plots.
Conclusions:
- Fluorescence microscopy is an effective tool for analyzing polymer-supported oxygen sensors.
- Micro- and nano-crystallization significantly impact sensor performance and response linearity.
- These findings aid in the rational design of advanced luminescence-based oxygen sensors.
Related Concept Videos
01:37Super-resolution Fluorescence Microscopy
Super-resolution fluorescence microscopy (SRFM) provides a better resolution than conventional fluorescence microscopy by reducing the point spread function (PSF). PSF is the light intensity distribution from a point that causes it to appear blurred. Due to PSF, each fluorescing point appears bigger than its actual size, and it is the PSF interference of nearby fluorophores that causes the blurred image. Various approaches to achieving higher resolution through SRFM have recently been developed.
01:23Photoluminescence: 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...
A pair of electrons in a...
01:26Variables 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...
01:14Photoluminescence: 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...
01:25Fluorescence and Phosphorescence: Instrumentation
Fluorometers and spectrofluorometers are two types of instruments used for measuring molecular fluorescence. These instruments differ in how they select excitation and emission wavelengths and the type of light sources they utilize. Fluorometers use absorption interference filters to choose excitation and emission wavelengths. The excitation source in a fluorometer is typically a low-pressure mercury vapor lamp that emits intense lines distributed throughout the ultraviolet and visible regions.