Dynamic Photoresists for Precision 3D Laserlithography Based on Wavelength Resolved Photochemistry

The design of photoresists with photoadatable properties critically depends on our understanding of the wavelength resolved reactivity of the employed chromophores. Thus, initially, the lecture will dive into the photophysics of a range of reaction systems devised in our laboratories, exploring how their chemical response varies as a function of varying monochromatic wavelengths. Surprisingly, the absorption spectrum is a poor indicator for photochemical reactivity, as will be demonstrated by a range of action plots on different reaction systems.<br/><br/>Based on the in-depth insights of our action plot analyses, the lecture will explore how the light-responsive adaptation of polymer materials requires specific wavelengths to induce reversible covalent bond formation and dissociation. Our efforts have been devoted to pioneering a toolbox of photochemical reaction systems that can be addressed fully independently with different colours of light, opening the door for the generation of light adaptive nano- and micro-structured materials via 3D laser lithography, including examples of out-of-equilibrium photo-dynamic soft matter materials.<br/><br/><b>Selected References</b><br/><br/>Rodrigues, L. L; Micallef, A. S.; Pfrunder, M.; Truong, V.X.; McMurtrie, J. C.; Dargaville, T.R.; Goldmann, A. S.; Feist, F.; Barner-Kowollik, C. <i>J. Am. Chem. Soc.</i> <b>2021</b>, <i>143</i>, 7292-7297.<br/>Houck, H. A.; Blasco, E.; Du Prez, F. E.; Barner-Kowollik, C. <i>J. Am. Chem. Soc.</i> <b>2019</b>, <i>141</i>, 12329-12337<br/>Kalayci, K.; Frisch, H.; Truong, V. X.; Barner-Kowollik, C<b>.</b> <i>Nat. Comm.</i> <b>2020</b>, 11, 4193.<br/>Menzel,J.P. ; Noble, B.B. ; Blinco, J.P.; Barner-Kowollik, C. <i>Nat. Comm.</i> <b>2021</b>, 1691.<br/>Gernhardt, M.; Blasco, E.; Hippler, M., Blinco, J. P.; Bastmeyer, M.; Wegener, M.; Frisch, H.; Barner-Kowollik, C. <i>Adv. Mater.</i> <b>2019</b>, <i>31</i>, 1901269.<br/>Gräfe, D.; Gernhardt, M.; Ren J.; Blasco, E.; Wegener, M.; Woodruff, M. A.; Barner-Kowollik, C. <i>Adv. Funct. Mater</i>. <b>2020</b>, 2006998.<br/>Gräfe, D.; Wickberg, A.; Zieger, M. M.; Wegener, M.; Blasco, E.; Barner-Kowollik, C. <i>Nat. Comm.</i> <b>2018</b>, <i>9</i>, 2788