title: Size-dependent behaviors of femtosecond laser-prototyped polymer micronanowires.
abstract: A remarkable recent progress in two-photon photopolymerization is the achievement of fabrication resolution around tens of nanometers, establishing a femtosecond laser as a nanofabrication tool. However, how the superresolution has been made possible is still under arguement. We propose a concept of polymer network permeability to solvents, meaning a structure-loosened nanopolymer state that allows free penetration of small molecules to interpret the mechanism. Experimentally, we found proof showing existence of the state, including an unusually large volume shrinkage rate (>60%), shape-memory effect, a giant softness of nanospring, and the mechanical stability of rinsed two-photon written polymer nanowires.
authors.affiliation: Department of Applied Physics, Osaka University, Suita, Osaka, Japan.
authors.forename: Kenji
authors.initials: K
authors.lastname: Takada
authors.forename: Dong
authors.initials: D
authors.lastname: Wu
authors.forename: Qi-Dai
authors.initials: QD
authors.lastname: Chen
authors.forename: Satoru
authors.initials: S
authors.lastname: Shoji
authors.forename: Hong
authors.initials: H
authors.lastname: Xia
authors.forename: Satoshi
authors.initials: S
authors.lastname: Kawata
authors.forename: Hong-Bo
authors.initials: HB
authors.lastname: Sun