Nanopatterning of a fluorescent polymer by scanning probe lithography
30.10.17 - Congratulations to Samuel Tobias Zimmermann and co-authors for their publication in ACS Applied Materials & Interfaces "Nanopatterning of a stimuli-responsive fluorescent supramolecular polymer by thermal scanning probe lithography".
The miniaturization of nanometer-sized multicolor fluorescent features is of continuous significance for security features, data storage, and sensors. Recent advances in engineering of stimuli-responsive supramolecular polymeric materials that respond upon exposure to heat or mechanical force by changing their fluorescence characteristics, open new opportunities as functional lithographic resists. Here, we demonstrate the patterning of a thermochromic supramolecular material by thermal scanning probe lithography (t-SPL), an emerging nanofabrication technique, which allows for ultra-fast indentation with a heated nanoprobe, resulting in both fluorescent and topographic nanofeatures. t-SPL indentation reveals a linear relation between the temperature at which material softening occurs and the indentation force in the range from 200 to 500 nN. The softening temperature also decreases as the heating time increases from 4 μs to 1 ms, following time-temperature superposition behavior. Our results herein confirm that the fluorescence contrast, perceivable as a shift from red to green, was obtained by kinetic trapping of the dissociated state due to ultra-rapid cooling when the probe is removed. We use t-SPL to create highly customized fluorescence patterns up to 40x40μm2 in size with a spatial resolution of 86 nm and change the pitch size to modify the fluorescence intensity when observed by fluorescence microscopy. As an application, multifaceted security features with nanometer resolution are explored.