2026-10-11T22:37:31Z https://api.figshare.com/v2/oai

oai:figshare.com:article/34028062 2026-09-29T22:07:14Z category_1 category_4 category_915 category_7 category_21 category_272 category_873 category_135 portal_63 item_type_6 month_year_09_2026

Self-Assembled Monolayers and Solvent Composition Control the Orientation and Work Function of Pyrene-Based [7]Helicenes Ivan Alic (25139371) Katsiaryna Kutsenka (25139374) Kristián Kříž (25139377) Lukáš Kalina (8101910) David Bína (2615863) Jan Hanus (2387845) Jaromír Kopeček (5657996) Anne de la Pena Lopez (25139380) Radek Litvín (2059249) Milan Mašát (1357134) Eva Kaletová (1299246) Dominik Farka (12206319) Biophysics Biochemistry Physical Sciences not elsewhere classified Medicine Biotechnology Environmental Sciences not elsewhere classified Chemical Sciences not elsewhere classified Computational Biology varying toluene content simple processing strategy functional organic molecules solvent composition control based optoelectronic materials work function modulation work function optoelectronic devices limited control mirror image mechanical properties high dilutions gain insight following headgroups findings hint energy conversion electronic properties assembly process assembled monolayers >- pyran >)-(−), deposited Self-assembled monolayers (SAMs) and solvent composition critically influence the orientation and electronic properties of functional organic molecules, paving the way for energy conversion and optoelectronic devices. PeakForce quantitative nanomechanics atomic force microscopy (AFM) was used to investigate pyrene-based 2<i>H</i>-pyran[7]helicene (<i>P</i>,<i>S</i>,<i>S</i>)-(+) and its mirror image, 2<i>H</i>-pyran[7]helicene (<i>M</i>,<i>R</i>,<i>R</i>)-(−), deposited on self-assembled monolayers (SAMs) with one of the following headgroups: adamantyl, phenyl, and trityl. By varying toluene content and dilution during spin-coating, we achieve changes to the topography, mechanical properties, and work function of our surfaces and are able to link these changes to the achievement of limited control over the modulation of the helicene orientation and gain insight into the self-assembly process on said SAMs. At high dilutions, we were able to detect distinct nucleation sites for helicene structures. These orientational changes and associated disorder correlate directly with work function modulation, suggesting a way and a mechanism for tuning electronic properties via these interfaces. Our findings hint at a simple processing strategy to engineer the molecular orientation and work function, advancing the design of helicene-based optoelectronic materials. 2026-09-29T00:00:00Z Text Journal contribution 10.1021/acs.langmuir.6c01280.s002 https://figshare.com/articles/journal_contribution/Self-Assembled_Monolayers_and_Solvent_Composition_Control_the_Orientation_and_Work_Function_of_Pyrene-Based_7_Helicenes/34028062 CC BY-NC 4.0