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[Display omitted] • PDMS surface is wrinkled by using an rf-sputtered ZnO sacrificial layer. • The optimal power density of wrinkle TENG increases by 78.5 times than the flat one. • The simulation proves the wrinkled surface can promote TENGs' output performance. Triboelectric nanogenerators (TENG) can convert mechanical energy to electricity. Its conversion efficiency strongly depends on the contact area of the triboelectric materials. Here, a simple strategy is developed to wrinkle the surface of polydimethylsiloxane (PDMS) by using an rf-sputtered ZnO sacrificial layer. The resulting TENG device demonstrates improved triboelectric performance in contrast to its counterpart fabricated on a flat PDMS. The optimal open circuit voltage (V OC), short circuit current (I SC) and pulse output power density with matched external load are 170 V, 8.7 × 10-7 A and 189 μW/cm2, which are 8.9, 2.2 and 78.5 times higher than those of the flat device, respectively. This simple and efficient method may hopefully promote the application of TENG in the field of flexible wearable electronics. [ABSTRACT FROM AUTHOR]

• CuI thin films have been synthesized in iodine solution at room temperature. • An apparent NBE peak can be recognized both in PL and XEL spectra. • Iodine-rich condition is beneficial to improve the XEL yield of CuI thin films. CuI is considered as a potential candidate for fast scintillator material due to the fast decay time. However, the ever-reported CuI scintillator usually demonstrates a more intensive deep-level emission with the decay time as long as 2.82 μs, which is unfavorable for the application as a fast scintillator material. In present work, γ-phase CuI were synthesized by iodizing Cu thin films in iodine solution at room temperature. An apparent near band-edge emission (NBE) is observed both in photoluminescence and X-ray excited luminescence spectra. By analyzing the variation of the relative intensity ratio of the sub-peaks composing NBE against different fabrication conditions, it can be deduced that Cu vacancy and surface chemisorbed iodine are responsible for the above luminescence behavior. It is hoped that these findings may boost the exploration of CuI thin films as fast scintillator materials. [ABSTRACT FROM AUTHOR]

Abstract: Oxidized nickel nanoparticles ranging from 2 to 3 nm have been grown on a DNA template. The synthesized products have been characterized by AFM and XPS. The results showed that uniformly oxidized nickel nanoparticles can be grown and assembled on a DNA template. These assembled small NiO nanostructures may have some potential application as catalysts, magnetic materials or electrochromic films. Theoretically, this synthetic method can be applied to fabricate other metals on a DNA template. [Copyright &y& Elsevier]