Photoinduced work function changes by isomerization of a densely packed azobenzene-based SAM on Au: a joint experimental and theoretical study

|NanoSci-E+ project SENSORS||International Center for Frontier Research in Chemistry (FRC, Strasbourg)||Belgian National Fund for Scientific Research (FNRS)||Swiss Nationals Science Foundation (SNF)||Swiss Nanoscience Institute (SNI)||
Responsive monolayers are key building blocks for future applications in organic and molecular electronics in particular because they hold potential for tuning the physico-chemical properties of interfaces, including their energetics. Here we study a photochromic SAM based on a conjugated azobenzene derivative and its influence on the gold work function (Phi(Au)) when chemisorbed on its surface. In particular we show that the Phi(Au) can be modulated with external stimuli by controlling the azobenzene trans/cis isomerization process. This phenomenon is characterized experimentally by four different techniques, kelvin probe, kelvin probe force microscopy, electroabsorption spectroscopy and ultraviolet photoelectron spectroscopy. The use of different techniques implies exposing the SAM to different measurement conditions and different preparation methods, which, remarkably, do not alter the observed work function change (Phi(trans)-Phi(cis)). Theoretical calculations provided a complementary insight crucial to attain a deeper knowledge on the origin of the work function photo-modulation.

Liscio, AISOF CNR (author)
Di Stasio, FUCL (author)
Van Dyck, CUniversity of Mons (author)
Osella, SUniversity of Mons (author)
Cornil, DUniversity of Mons (author)
Mian, SUCL (author)
Lazzerini, G MUCL (author)
Fenwick, OUCL (author)
Orgiu, EUniversity of Strasbourg (author)
Reinders, FUniversity of Basel (author)
Braun, SlawomirLinköpings universitet,Ytors Fysik och Kemi,Tekniska högskolan(Swepub:liu)slama19 (author)
Fahlman, MatsLinköpings universitet,Ytors Fysik och Kemi,Tekniska högskolan(Swepub:liu)matfa21 (author)
Mayor, MUniversity of Basel (author)
Cornil, JUniversity of Mons (author)
Palermo, VISOF CNR (author)
Cacialli, FUCL (author)
Samori, PUniversity of Strasbourg (author)
University of StrasbourgISOF CNR (creator_code:org_t)

In:Physical Chemistry, Chemical Physics - PCCP: Royal Society of Chemistry13:32, s. 14302-143101463-90761463-9084

By the author/editor: Crivillers, N; Liscio, A; Di Stasio, F; Van Dyck, C; Osella, S; Cornil, D; show more...; Mian, S; Lazzerini, G M; Fenwick, O; Orgiu, E; Reinders, F; Braun, Slawomir; Fahlman, Mats; Mayor, M; Cornil, J; Palermo, V; Cacialli, F; Samori, P; show less...

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