Nano-Micro Letters

Subtle Variations in Surface Properties of Black Silicon Surfaces Influence the Degree of Bactericidal Efficiency

Chris M. Bhadra1, Marco Werner2, Vladimir A. Baulin2, Vi Khanh Truong1, Mohammad Al Kobaisi1, Song Ha Nguyen1, Armandas Balcytis1,3, Saulius Juodkazis1,3, James Y. Wang1, David E. Mainwaring1, Russell J. Crawford4, Elena P. Ivanova1, *

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Nano-Micro Lett. (2018) 10: 36

First Online: 21 December 2017 (Article)


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Fig. 1 Identification and detection of the nanopillars of the black silicon surfaces. a Training set based on the SEM images of bSi-1 (×10,000 magnification) used to distinguish pillar tips and free regions between the pillars. P: pillar tip; E: empty space between pillars. b Detected pillar tips (red squares) on each type of bSi surface. Scale bars correspond to 500 nm.

One of the major challenges faced by the biomedical industry is the development of robust synthetic surfaces that can resist bacterial colonization. Much inspiration has been drawn recently from naturally occurring mechano-bactericidal surfaces such as the wings of cicada (Psaltoda claripennis) and dragonfly (Diplacodes bipunctata) species in fabricating their synthetic analogues. However, the bactericidal activity of nanostructured surfaces is observed in a particular range of parameters reflecting the geometry of nanostructures and surface wettability.  Here, several of the nanometer-scale characteristics of black silicon (bSi) surfaces including the density and height of the nanopillars that have the potential to influence the bactericidal efficiency of these nanostructured surfaces have been investigated. The results provide important evidence that minor variations in the nanoarchitecture of substrata can substantially alter their performance as bactericidal surfaces.



Black silicon; Nanoarchitecture; Bactericidal efficiency; Deep reactive ion etching (DRIE); Neural network analysis

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