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arXiv · 2605.19676

Impacts of annealing on structural and photophysical properties of zinc phthalocyanine adsorbed on graphene

Gautier Creutzer·Quentin Fernez·Nataliya Kalashnyk·Zohreh Safarzadeh·Lydia Sosa Vargas·Céline Fiorini-Debuisschert·Nicolas Fabre·Fabrice Charra
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Abstract

We report the demonstration and analysis by combined scanning-tunneling-microscopy and optical microspectroscopy of a 2D phase change experienced by a self-assembled zinc phthalocyanine (ZnPc) monolayer adsorbed on graphene. To probe the intrinsic properties of individual ZnPc molecules, they are spatially confined within the pores of a self-assembled 2D matrix. This confinement allows us to track a phase change induced by annealing, which we discuss in terms of a planar-square to shuttlecock molecular transition. We show that after annealing of the adsorbed ZnPc, the exposition of Zn atoms to reactants in a supernatant solution is improved, for example, for metal-ligand formation towards 3D self-assembly.

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Gautier Creutzer, Quentin Fernez, Nataliya Kalashnyk, Zohreh Safarzadeh, Lydia Sosa Vargas, Céline Fiorini-Debuisschert, Nicolas Fabre, Fabrice Charra. 2026-05-19. Impacts of annealing on structural and photophysical properties of zinc phthalocyanine adsorbed on graphene. https://arxiv.org/abs/2605.19676

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