title: Nearly isotropic piezoresistive response due to charge detour conduction in nanoparticle thin films.
abstract: Piezoresistive responses of nanoparticle thin-film strain sensors on flexible polyimide substrates were studied. Disordered interparticle tunneling introduces microscopic detour of charge conduction so as to reduce gauge factors. The disorder also results in large resistance change when current flows in the direction perpendicular to a unidirectional strain, reducing response anisotropy. For practical usages, stability and endurance of these strain sensors are confirmed with 7 × 10(4) bending cycles. Cracks form in devices under prolonged cyclic bending and slightly reduce gauge factor.
authors.affiliation: Department of Physics, National Chung Hsing University, Taichung 402, Taiwan.
authors.forename: Cheng-Wei
authors.initials: CW
authors.lastname: Jiang
authors.affiliation: Department of Physics, National Dong Hwa University, Hualien 974, Taiwan.
authors.forename: I-Chih
authors.initials: IC
authors.lastname: Ni
authors.affiliation: Department of Physics, National Dong Hwa University, Hualien 974, Taiwan.
authors.forename: Shien-Der
authors.initials: SD
authors.lastname: Tzeng
authors.affiliation: 1] Department of Physics, National Chung Hsing University, Taichung 402, Taiwan [2] Institute of NanoScience and Research Center for Sustainable Energy and Nanotechnology, National Chung Hsing University, Taichung 402, Taiwan.
authors.forename: Watson
authors.initials: W
authors.lastname: Kuo