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Vol. 10 No. 2 (2018)

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

https://doi.org/10.1007/s40820-017-0186-9
Chris M. Bhadra
School of Science, Faculty of Science, Engineering and Technology, Swinburne University of Technology, Hawthorn, VIC 3122, Australia
Marco Werner
Departament d’Enginyeria Quı´mica, Universitat Rovira i Virgili, Avinguda dels Paı¨sos Catalans 26, 43007 Tarragona, Spain
Vladimir A. Baulin
Departament d’Enginyeria Quı´mica, Universitat Rovira i Virgili, Avinguda dels Paı¨sos Catalans 26, 43007 Tarragona, Spain
Vi Khanh Truong
School of Science, Faculty of Science, Engineering and Technology, Swinburne University of Technology, Hawthorn, VIC 3122, Australia
Mohammad Al Kobaisi
School of Science, Faculty of Science, Engineering and Technology, Swinburne University of Technology, Hawthorn, VIC 3122, Australia
Song Ha Nguyen
School of Science, Faculty of Science, Engineering and Technology, Swinburne University of Technology, Hawthorn, VIC 3122, Australia
Armandas Balcytis
School of Science, Faculty of Science, Engineering and Technology, Swinburne University of Technology, Hawthorn, VIC 3122, Australia
Saulius Juodkazis
School of Science, Faculty of Science, Engineering and Technology, Swinburne University of Technology, Hawthorn, VIC 3122, Australia
James Y. Wang
School of Science, Faculty of Science, Engineering and Technology, Swinburne University of Technology, Hawthorn, VIC 3122, Australia
David E. Mainwaring
School of Science, Faculty of Science, Engineering and Technology, Swinburne University of Technology, Hawthorn, VIC 3122, Australia
Russell J. Crawford
School of Science, RMIT University, Melbourne, VIC 3001, Australia
Elena P. Ivanova
School of Science, Faculty of Science, Engineering and Technology, Swinburne University of Technology, Hawthorn, VIC 3122, Australia

Corresponding Author: Elena P. Ivanova

eivanova@swin.edu.au

Nano-Micro Letters, Vol. 10 No. 2 (2018), Article Number: 36

Abstract

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 analogs. 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.


Highlights:


1 Three types of black silicon (bSi) surface were successfully fabricated using deep reactive ion etching with pillar heights (652.7–1063.2 nm) and density (8–11 tips per µm2).
2 Less bactericidal bSi surfaces were found to contain nanopillars of heights reaching 1000 nm that were not always well separated, lower pillar density (8 tips per µm2), and aspect ratios of 8.8.

Keywords

Black silicon Nanoarchitecture Bactericidal efficiency Deep reactive ion etching (DRIE) Neural network analysis
Bhadra, Chris M., Marco Werner, Vladimir A. Baulin, Vi Khanh Truong, Mohammad Al Kobaisi, Song Ha Nguyen, Armandas Balcytis, Saulius Juodkazis, James Y. Wang, David E. Mainwaring, Russell J. Crawford, and Elena P. Ivanova. 2018. “Subtle Variations in Surface Properties of Black Silicon Surfaces Influence the Degree of Bactericidal Efficiency”. Nano-Micro Letters 10 (2):36. https://doi.org/10.1007/s40820-017-0186-9.
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