title: An efficient two-photon-generated photoacid applied to positive-tone 3D microfabrication.
abstract: A two-photon-activatable photoacid generator, based on a bis[(diarylamino) styryl]benzene core with covalently attached sulfonium moieties, has been synthesized. The photoacid generator has both a large two-photon absorption cross section (delta = 690 x 10(-50) centimeter(4) second per photon) and a high quantum yield for the photochemical generation of acid (phiH+ = 0.5). Under near-infrared laser irradiation, the molecule produces acid after two-photon excitation and initiates the polymerization of epoxides at an incident intensity that is one to two orders of magnitude lower than that needed for conventional ultraviolet-sensitive initiators. This photoacid generator was used in conjunction with a positive-tone chemically amplified resist for the fabrication of a three-dimensional (3D) microchannel structure.
authors: Department of Chemistry, Optical Sciences Center, University of Arizona, Tucson, AZ 85721, USA.
authors: Wenhui
authors: W
authors: Zhou
authors: Stephen M
authors: SM
authors: Kuebler
authors: Kevin L
authors: KL
authors: Braun
authors: Tianyue
authors: T
authors: Yu
authors: J Kevin
authors: JK
authors: Cammack
authors: Christopher K
authors: CK
authors: Ober
authors: Joseph W
authors: JW
authors: Perry
authors: Seth R
authors: SR
authors: Marder