Diamond-coated ‘black silicon’ as a promising material for high-surface-area electrochemical electrodes and antibacterial surfaces

May, Paul; Clegg, Michael; Silva, Tiago; Zanin, Hudson; Fatibello‐Filho, Orlando; Celorrio, Verónica; Fermı́n, David J.; Welch, Colin; Hazell, Gavin; Fisher, Len; Nobbs, Angela H.; Su, Bo

doi:10.1039/c6tb01774f

Cited by 96 publications

(80 citation statements)

References 71 publications

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“…The smaller, more-rigid, spherical S. aureus cells have a higher probability of attaching in these non-lethal regions than the larger P. aeruginosa cells. These multi-directional, bimodal nanostructures may exhibit a greater biocidal activity than that of the more regular nanostructures previously investigated, including both naturally occuring 23,25,26,32,[34][35][36][53][54][55] and synthetic 24,27,33,37,48,49,54,57,65 surfaces. This occurs because the bacteria are subjected to forces operating in multiple directions during surface adsorption, which limits their ability to evade critical membrane damage, and hence cell death.…”

Section: Concentrationsmentioning

confidence: 99%

“…This effective nanospike height is consistent with that reported in a number of previous studies, 22,23,27,38,46-48 which suggests that a nanofeature height of $300 nm tends to display a greater level of biocidal activity towards both Gram-negative and Gram-positive bacteria than substrata possessing nanospikes with greater or less height. 22,23,27,38,[46][47][48] The reason for the effectiveness of this 'optimal' peak height in killing bacteria is still largely unknown. The inter-pillar spacing on the substrata used in this study was slightly larger than that of a number of previously reported effective antibacterial surfaces, which would initially suggest that nanofeature height plays an important role in the overall bactericidal behaviour of the substrates.…”

Section: 2526mentioning

confidence: 99%

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Multi-directional electrodeposited gold nanospikes for antibacterial surface applications

et al. 2019

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The incorporation of high-aspect-ratio nanostructures across surfaces has been widely reported to impart antibacterial characteristics to a substratum. This occurs because the presence of such nanostructures can induce the mechanical rupture of attaching bacteria, causing cell death. As such, the development of highefficacy antibacterial nano-architectures fabricated on a variety of biologically relevant materials is critical to the wider acceptance of this technology. In this study, we report the antibacterial behavior of a series of substrata containing multi-directional electrodeposited gold (Au) nanospikes, as both a function of deposition time and precursor concentration. Firstly, the bactericidal efficacy of substrata containing Au nanospikes was assessed as a function of deposition time to elucidate the nanopattern that exhibited the greatest degree of biocidal activity. Here, it was established that multi-directional nanospikes with an average height of $302 nm AE 57 nm (formed after a deposition time of 540 s) exhibited the greatest level of biocidal activity, with $88% AE 8% of the bacterial cells being inactivated. The deposition time was then kept constant, while the concentration of the HAuCl 4 and Pb(CH 3 COO) 2 precursor materials (used for the formation of the Au nanospikes) was varied, resulting in differing nanospike architectures.Altering the Pb(CH 3 COO) 2 precursor concentration produced multi-directional nanostructures with a wider distribution of heights, which increased the average antibacterial efficacy against both Gramnegative Pseudomonas aeruginosa and Gram-positive Staphylococcus aureus bacteria. Importantly, the in situ electrochemical fabrication method used in this work is robust and straightforward, and is able to produce highly reproducible antibacterial surfaces. The results of this research will assist in the wider utilization of mechano-responsive nano-architectures for antimicrobial surface technologies.

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Section: Concentrationsmentioning

confidence: 99%

Section: 2526mentioning

confidence: 99%

Multi-directional electrodeposited gold nanospikes for antibacterial surface applications

et al. 2019

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“…May and co‐workers reported a similar approach, but inductively coupled plasma (ICP) etching process of the Si substrate led to the formation of needles (Si Needles) reaching a length of almost 20 μm as shown in Figure A. The diamond coating was obtained by a CVD process when a diborane‐rich CH 4 /H 2 mixture was used, resulting in a heavily boron‐doped micro‐ or nanocrystalline diamond film over the Si needles (Figure B).…”

Section: Cvd‐deposited Diamond Compositesmentioning

confidence: 96%

Nano‐engineered Diamond‐based Materials for Supercapacitor Electrodes: A Review

Siuzdak

Bogdanowicz

2017

Energy Tech

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Owing to the popularity of carbon‐based supercapacitors, diamond has been examined as a potential candidate for such devices with unique advantages such as a wide electrochemical potential window and stable capacitive behavior in both aqueous and non‐aqueous electrolytes. Moreover, its chemical stability in harsh environments at extreme applied potentials and currents provides unique opportunities for designing new supercapacitors. Owing to the intrinsic low surface area of diamond, it is necessary to increase the electrochemically active surface area or to produce diamond‐based composites, thereby ensuring capacitance improvement for the practical applications. According to previous literature reports, nano‐engineered diamond structures can achieve a specific capacitance values as high as 10 mF cm−2 with a specific energy of 10–100 Wh kg−1 in aqueous electrolyte. The present manuscript reviews the recent advances in this topic of research by highlighting the potentials and challenges of diamond‐based supercapacitors. Special attention is paid to the fabrication methods and electrochemical performance of particular material combinations in view of further application for supercapacitor construction.

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“…Inspired by nature, a number of studies have since been carried out to develop bactericidal nanotopographies on synthetic materials. They include silicon and diamond coated silicon, titanium and its alloy, polymers, stainless steel, and aluminium . Table 3 lists a summary of biomimetic bactericidal surfaces on various materials currently in development.…”

Section: Antimicrobial Nanotopographiesmentioning

confidence: 99%

Multifunctional Coatings and Nanotopographies: Toward Cell Instructive and Antibacterial Implants

Mas‐Moruno

Dalby

2018

Adv Healthcare Materials

187

171

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In biomaterials science, it is nowadays well accepted that improving the biointegration of dental and orthopedic implants with surrounding tissues is a major goal. However, implant surfaces that support osteointegration may also favor colonization of bacterial cells. Infection of biomaterials and subsequent biofilm formation can have devastating effects and reduce patient quality of life, representing an emerging concern in healthcare. Conversely, efforts toward inhibiting bacterial colonization may impair biomaterial–tissue integration. Therefore, to improve the long‐term success of medical implants, biomaterial surfaces should ideally discourage the attachment of bacteria without affecting eukaryotic cell functions. However, most current strategies seldom investigate a combined goal. This work reviews recent strategies of surface modification to simultaneously address implant biointegration while mitigating bacterial infections. To this end, two emerging solutions are considered, multifunctional chemical coatings and nanotopographical features.

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Diamond-coated ‘black silicon’ as a promising material for high-surface-area electrochemical electrodes and antibacterial surfaces

Abstract: Coating black silicon needles in a uniform layer of conducting boron-doped CVD diamond produces a high-surface-area electrode material that promising for electrochemical applications, as well as acting as a robust bactericidal surface.

Cited by 96 publications

References 71 publications

Multi-directional electrodeposited gold nanospikes for antibacterial surface applications

Multi-directional electrodeposited gold nanospikes for antibacterial surface applications

Nano‐engineered Diamond‐based Materials for Supercapacitor Electrodes: A Review

Multifunctional Coatings and Nanotopographies: Toward Cell Instructive and Antibacterial Implants

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