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PC: Electrochemical deposition of metals onto silicon. J Phys D: Appl Phys 1927, 1998:31. 27. Qu Y, Zhou H, Duan X: Porous silicon nanowires. Nanoscale 2011, 3:4060–4068.CrossRef 28. Graf D, Bauer-Mayer S, Schnegg A: Influence of HF-H2O2 treatment on Si(100) and Si(111) surfaces. J Appl Phys 1993, 74:1679–1683.CrossRef Competing interests The authors declare that they have no competing interests. Authors’ contributions DW and PS conceived, designed, and analyzed the BYL719 concentration experiments. RJ performed the substrate conformal imprint lithography. DW, SD, and AA carried out and organized the other experiments. DW and PS wrote the manuscript. All authors discussed the results, commented on the manuscript, and read and approved its final version.”
“Background Biological materials (such as bones or shells, etc.) with multiscale and hierarchical structures consisting of thick, hard inorganic mineral layers and thin, soft organic layers exhibit an excellent combination of strength and toughness [1, 2].

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