Evaluation of Local Mechanical and Chemical Properties via AFM as a Tool for Understanding the Formation Mechanism of Pulsed UV Laser-Nanoinduced Patterns on Azo-Naphthalene-Based Polyimide Films | JoVE Visualize

Evaluation of Local Mechanical and Chemical Properties via AFM as a Tool for Understanding the Formation Mechanism of Pulsed UV Laser-Nanoinduced Patterns on Azo-Naphthalene-Based Polyimide Films

Iuliana Stoica¹, Elena-Luiza Epure², Catalin-Paul Constantin¹

¹"Petru Poni" Institute of Macromolecular Chemistry, 700487 Iasi, Romania.

Nanomaterials (Basel, Switzerland)|April 3, 2021

View abstract on PubMed

Summary

Azo-polyimides can create surface relief gratings (SRGs) using pulsed UV laser irradiation. Atomic force microscopy revealed photo-fluidization and nanomechanical changes, explaining SRG formation mechanisms.

Area of Science:

Materials Science
Polymer Chemistry
Nanotechnology

Background:

Aromatic polyimides with azo-naphthalene groups are explored for optical applications.
Surface relief gratings (SRGs) are crucial for photonic devices.
Understanding laser-induced surface modification is key for material processing.

Purpose of the Study:

To investigate the generation of SRGs in azo-polyimides via pulsed UV laser irradiation.
To analyze the photo-fluidization and supramolecular reorganization processes.
To elucidate the nanomechanical properties and formation mechanisms of laser-induced SRGs.

Main Methods:

Pulsed UV laser irradiation through phase masks.
Atomic Force Microscopy (AFM) for nanoscale topographical and nanomechanical analysis (PinPoint mode).
Confocal Raman spectroscopy and molecular simulations for chemical and conformational insights.

Main Results:

SRGs were successfully generated with varying morphologies and amplitudes.
AFM PinPoint mode provided quantitative nanomechanical data (modulus, adhesion, deformation) correlated with topography.
Laser irradiation induced changes in chemical composition and macromolecular conformation.

Conclusions:

Pulsed UV laser irradiation effectively induces SRGs in azo-polyimides.
AFM, particularly PinPoint mode, is highly effective for characterizing laser-induced nanostructures and understanding their formation.
Combined AFM, Raman, and simulation approaches offer comprehensive insights into material modification mechanisms.