title: Photon upconversion lithography: patterning of biomaterials using near-infrared light.
abstract: Photon upconversion lithography is demonstrated for the patterning of proteins using near-infrared light. Proteins and an upconverting-nanoparticle-decorated substrate are linked via blue-light-cleavable Ru complexes. The substrate is irradiated using near-infrared light with a photomask. In the exposed areas, upconverting nanoparticles convert the near-infrared light into blue light, which induces cleavage of the Ru complexes and release of the proteins.
authors.affiliation: Max-Planck-Institut für Polymerforschung, Ackermannweg 10, 55128, Mainz, Germany.
authors.forename: Zhijun
authors.initials: Z
authors.lastname: Chen
authors.forename: Shuqing
authors.initials: S
authors.lastname: He
authors.forename: Hans-Jürgen
authors.initials: HJ
authors.lastname: Butt
authors.forename: Si
authors.initials: S
authors.lastname: Wu
mesh_terms: D001672:Biocompatible Materials / Q000737:chemistry*; D007259:Infrared Rays; D008958:Models, Molecular; D009942:Organometallic Compounds / Q000737:chemistry; D055668:Photochemical Processes; D017785:Photons; D011327:Printing; D011487:Protein Conformation; D011506:Proteins / Q000737:chemistry; D012428:Ruthenium / Q000737:chemistry
chemical_list: D001672:Biocompatible Materials; D009942:Organometallic Compounds; D011506:Proteins; D012428:Ruthenium
keywords: nanoparticles; photocages; photopatterning; protein adsorption; upconversion