Colorimetric response in polydiacetylene at the single domain level using hyperspectral microscopy.

Area of Science:

• Materials Science
• Nanotechnology
• Spectroscopy

Background:

• Polydiacetylene (PDA) materials exhibit structural variations at the nanoscale, impacting their reproducibility in chemo/biosensing applications.
• Understanding these structural heterogeneities is crucial for advancing PDA-based sensor technology.

Purpose of the Study:

• To spatially map nanoscale structural distributions within a single polydiacetylene crystal.
• To investigate the influence of stimuli (heat and pH) on PDA structural transitions using advanced microscopy.

Main Methods:

• Utilized hyperspectral microscopy in the visible wavelength range for spatial mapping of absorption spectra.
• Applied hyperspectral imaging to track the blue-to-red color transition in polydiacetylene crystals.
• Analyzed spectral distributions at the spatial resolution of standard optical microscopy.

Main Results:

• Generated a spatial map detailing the distribution of structural variations within a single PDA crystal.
• Observed that both heat and pH stimulation induce distinct spatial patterns in the blue-to-red transition pathways.
• Demonstrated the capability of hyperspectral microscopy to visualize nanoscale structural heterogeneity and stimulus-induced changes.

Conclusions:

• Hyperspectral microscopy is effective for characterizing nanoscale structural variations in PDA crystals.
• Stimulus-induced transitions in PDA exhibit unique spatial patterns, offering insights into their sensing mechanisms.
• This approach provides a foundation for improving the reproducibility and reliability of PDA-based chemo/biosensors.