Article Dans Une Revue Chemistry of Materials Année : 2011

Enhancement of the Two-Photon Initiating Efficiency of a Thioxanthone Derivative through a Chevron-Shaped Architecture

Résumé

We investigated the one- and two-photon excitation properties of a new hybrid anthracene–thioxanthone (ANTX) system, which was assembled into a chevron-shaped molecular architecture. Such a geometrical association first preserves the high efficiency of the free radical photoinitiator and leads, in the same time, to a strong increase in the two-photon absorption (2PA) cross section by more than a factor of 30 as compared to thioxanthone (TX). A four-state model was required to fit the 2PA spectrum of ANTX, which clearly undergoes a strong enhancement in the low-frequency region. As a consequence, ANTX constitutes a suitable two-photon initiating chromophore with a much higher efficiency as TX used as reference. At λexc = 710 nm for instance, we showed that the two-photon polymerization threshold of ANTX is five times lower with respect to that of TX. Additionally, we demonstrated by the fabrication of three-dimensional microstructures that this new hybrid system remains two-photon activable when excited at wavelengths near its one-photon absorption region as suggested by the sum–overstates model. We also show that this new two-photon initiator exhibits a higher reactivity than a diaminofluorene derivative, which is commonly used in two-photon polymerization.

Domaines

Fichier non déposé

Dates et versions

hal-04044078 , version 1 (24-03-2023)

Identifiants

Citer

Jean-Pierre Malval, Ming Jin, Fabrice Morlet-Savary, Hélène Chaumeil, Albert Defoin, et al.. Enhancement of the Two-Photon Initiating Efficiency of a Thioxanthone Derivative through a Chevron-Shaped Architecture. Chemistry of Materials, 2011, 23 (15), pp.3411-3420. ⟨10.1021/cm200595y⟩. ⟨hal-04044078⟩
50 Consultations
0 Téléchargements

Altmetric

Partager

  • More