Black-Si as a Photoelectrode

Linklater, Denver P.; Haydous, Fatima; Cheng, Xi; Pergolesi, Daniele; Hu, Jingwen; Ivanova, Elena P.; Juodkazis, Saulius; Lippert, Thomas; Juodkazytė, Jurga

doi:10.3390/nano10050873

Cited by 9 publications

(10 citation statements)

References 34 publications

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“…The ability to stable trap polymer on nanostructured Si is caused by enhancement of electric field of incident light (E) by a factor of E 2 /E o 2 � 5 in the vicinity closest to the tips of the black-Si needles. [43] It is clear that the enhancement effect strongly assists the trapping of polymer chains, as demonstrated in our previous work and dissipates heat from the focal volume due to the high thermal conductivity of Si. [32] Thus, we have successfully demonstrated FCC for perylene-PDMA.…”

Section: Resultssupporting

confidence: 69%

Fluorescence Colour Control in Perylene‐Labeled Polymer Chains Trapped by Nanotextured Silicon

et al. 2022

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The ability to modulate, tune, and control fluorescence colour has attracted much attention in photonics‐related research fields. Thus far, it has been impossible to achieve fluorescence colour control (FCC) for material with a fixed structure, size, surrounding medium, and concentration. Here, we propose a novel approach to FCC using optical tweezers. We demonstrate an optical trapping technique using nanotextured Si (black‐Si) that can efficiently trap polymer chains. By increasing the laser intensity, the local concentration of perylene‐labelled water‐soluble polymer chains increased inside the trapping potential. Accordingly, the excimer fluorescence of perylene increased while the monomer fluorescence decreased, evidenced by a fluorescence colour change from blue to orange. Using nanostructure‐assisted optical tweezing, we demonstrate control of the relative intensity ratio of fluorescence of the two fluorophores, thus showing remote and reversible FCC of the polymer assembly.

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Section: Resultssupporting

confidence: 69%

Fluorescence Colour Control in Perylene‐Labeled Polymer Chains Trapped by Nanotextured Silicon

et al. 2022

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“…23,24 The vicinity of the object to be trapped creates an extra E-field enhancement in the temporarily formed nanogap and facilitates trapping, as we observed previously on black-Si (longer wavelengths experience weaker localization at the tips of nanopillars, as we demonstrated for black-Si). 45,46 It should be noted that nanostructured TiO 2 can enhance the Raman scattering of adsorbed molecules with great efficiency. E-field enhancement, acting together with an electrostatic field due to optical absorption and electron−hole pair formation, and its effects on laser-free optical trapping using black-Ti require further investigation.…”

Section: Discussionmentioning

confidence: 99%

Incoherent Optical Tweezers on Black Titanium

Hashimoto

Uenobo

Takao

et al. 2021

ACS Appl. Mater. Interfaces

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Optical tweezers enable the manipulation of micro- and nanodielectric particles through entrapment using a tightly focused laser. Generally, optical trapping of submicron size particles requires high-intensity light in the order of MW/cm2. Here, we demonstrate a technique of stable optical trapping of submicron polymeric beads on nanostructured titanium surfaces (black-Ti) without the use of lasers. Fluorescent polystyrene beads with a diameter d = 20–500 nm were successfully trapped on black-Ti by low-intensity focused illumination of incoherent light at λ = 370 m from a Hg lamp. Light intensity was 5.5 W/cm2, corresponding to a reduced light intensity of 6 orders of magnitude. Upon switching off illumination, trapped particles were released from the illuminated area, indicating that trapping was optically driven and reversible. Such trapping behavior was not observed on nonstructured Ti surfaces or on nanostructured silicon surfaces. Thus, the Ti nanostructures were demonstrated to play a key role.

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“…[62] Nanostructured surfaces coated with TiO 2 are also promising biocidal surfaces that exhibit strong oxidizing (electron removal) properties (with UV light activation) that can be used to kill attaching viral particles. [110] The shape of the wetted perimeter of respiratory droplets will be significantly different across various nanostructured surfaces according to their respective hydrophobic/hydrophilic characteristics. This is likely to affect the drying rates of the respiratory droplets, which will lead to altering the (meta)stability of extending and reshaping the droplet interface, creating gradients in Laplace pressure that could also influence evaporative drying rates and viral viability.…”

Section: Antiviral Surface Structure Modifications By Nanotexturingmentioning

confidence: 99%

Towards antiviral polymer composites to combat COVID‐19 transmission

et al. 2021

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Polymer matrix composite materials have the capacity to aid the indirect transmission of viral diseases. Published research shows that respiratory viruses, including severe acute respiratory syndrome coronavirus 2 (SARS‐CoV‐2 or COVID‐19), can attach to polymer substrata as a result of being contacted by airborne droplets resulting from infected people sneezing or coughing in close proximity. Polymer matrix composites are used to produce a wide range of products that are “high‐touch” surfaces, such as sporting goods, laptop computers and household fittings, and these surfaces can be readily contaminated by pathogens. This article reviews published research on the retention of SARS‐CoV‐2 and other virus types on plastics. The factors controlling the viral retention time on plastic surfaces are examined and the implications for viral retention on polymer composite materials are discussed. Potential strategies that can be used to impart antiviral properties to polymer composite surfaces are evaluated. These strategies include modification of the surface composition with biocidal agents (e.g., antiviral polymers and nanoparticles) and surface nanotexturing. The potential application of these surface modification strategies in the creation of antiviral polymer composite surfaces is discussed, which opens up an exciting new field of research for composite materials.

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Black-Si as a Photoelectrode

Cited by 9 publications

References 34 publications

Fluorescence Colour Control in Perylene‐Labeled Polymer Chains Trapped by Nanotextured Silicon

Fluorescence Colour Control in Perylene‐Labeled Polymer Chains Trapped by Nanotextured Silicon

Incoherent Optical Tweezers on Black Titanium

Towards antiviral polymer composites to combat COVID‐19 transmission

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