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Power/Performance Bits: Feb. 8 Transparent sensor; graphene-enhanced heat pipes; large perovskite solar cells. Transparent sensor Researchers at Osaka University created a thin, flexible, transparent sensor using silver nanowire networks. High-resolution printing was used to fabricate the centimeter-scale cross-aligned silver nanowire arrays, with reproducible feature sizes from 20 to 250 micrometers. As a proof-of-concept for functionality, they used their arrays to detect electrophysiological signals from plants. A patterned polymer surface was created to define the subsequent nanowire feature size. Using a glass rod to sweep silver nanowires across the pattern led to either parallel or cross-aligned nanowire networks. “The sheet resistance of patterns less than 100 micrometers ranged from 25 to 170 ohms per square, and the visible light transmittance at 550 nanometers was 96% to 99%,” said Teppei Araki, an assistant professor at Osaka University. “These values are well-

Nick rolstonJohan liuReinhold dauskardtAya liuTeppei arakiTsuyoshi sekitaniShanghai universityMarche polytechnic universityDepartment of microtechnologyProfessor of electronics productionOsaka universityElectronics materialsFudan universitySystems laboratory at chalmersNational renewable energy laboratoryResearchers at stanford university