PANI@UiO-66 and PANI@UiO-66-NH2 Polymer-MOF Hybrid Composites as Tunable Semiconducting Materials

Jordan Shanahan; Daniel S Kissel; Eirin Sullivan

doi:10.1021/acsomega.9b03834

PANI@UiO-66 and PANI@UiO-66-NH₂ Polymer-MOF Hybrid Composites as Tunable Semiconducting Materials

ACS Omega. 2020 Mar 17;5(12):6395-6404. doi: 10.1021/acsomega.9b03834. eCollection 2020 Mar 31.

Authors

Jordan Shanahan¹, Daniel S Kissel¹, Eirin Sullivan²

Affiliations

¹ Department of Chemistry, Lewis University, One University Pkwy, Romeoville, Illinois 60446, United States.
² Department of Chemistry, Illinois State University, S University St, Normal, Illinois 61761, United States.

Abstract

This investigation explores optimum synthetic conditions for novel polymer-metal organic framework hybrid composites composed of Zr-terephthalate-based MOF UiO-66 and conductive polyaniline (PANI) nanofibers in an effort to optimize conductivity while minimizing MOF structural deformation. Successful syntheses of self-assembled PANI nanofibers in PANI@UiO-66 and PANI@UiO-66-NH₂ composites were confirmed using scanning electron microscopy, infrared spectroscopy, and powder X-ray diffraction. The polymer-MOF composites show different bonding synergies to the PANI nanofibers depending on the organic linker used. Electronic properties of the post-synthetically modified PANI@UiO-66 and PANI@UiO-66-NH₂ were investigated using UV-vis diffuse reflectance spectroscopy. Sheet resistivity of the self-assembled polymer-MOF composites was determined under an inert atmosphere at room temperature using four-point probe measurements to confirm tunable semiconductivity ranging from 40 to 2 mS/sq. Furthermore, the effects of aniline oxidation on the crystallinity and coordination of UiO-66 and UiO-66-NH₂ were determined through analysis of these results.