Functional surfaces of laser-microstructured silicon coated with thermoresponsive PS/PNIPAM polymer blends: Switching reversibly between hydrophilicity and hydrophobicity

Kanidi, Maria; Papagiannopoulos, Aristeidis; Matei, A.; Dinescu, M.; Pispas, Stergios; Kandyla, M.

doi:10.1016/j.apsusc.2020.146841

Cited by 16 publications

(13 citation statements)

References 48 publications

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“…HF etching for the removal of native SiO 2 , employed here prior to ZnO deposition, has been found not to affect the morphology, sulfur concentration, or optical properties of laser-microstructured silicon in SF 6 . 38,64 Photoconductivity. We compare the responsivity of the ZnO/flat-Si and ZnO/micro-Si devices.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…Therefore, even though it is possible that annealing has affected the NIR operation of the ZnO/micro-Si photodetector, we expect this effect to be limited. HF etching for the removal of native SiO2, employed here prior to ZnO deposition, has been found not to affect the morphology, sulfur concentration, or optical properties of laser-microstructured silicon in SF6 [38], [64]. We compare the responsivity of the ZnO/flat-Si and ZnO/micro-Si devices.…”

Section: Structure and Surface Morphologymentioning

confidence: 99%

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Laser-Microstructured ZnO/p-Si Photodetector with Enhanced and Broadband Responsivity across the Ultraviolet–Visible–Near-Infrared Range

Chatzigiannakis

Jaros

Leturcq

et al. 2020

ACS Appl. Electron. Mater.

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We develop ZnO/p-Si photodetectors by atomic layer deposition (ALD) of ZnO thin films on laser-microstructured silicon and we investigate their electrical and optical behavior, demonstrating high sensitivity and broadband operation. Microstructured p-type silicon was obtained by ns-laser irradiation in SF6 gas, which results in the formation of quasi-ordered and uniform microspikes on the silicon surface. The irradiated silicon contains sulfur impurities, which extend its absorbance to the near infrared. A thin film of ZnO was conformally deposited on the microstructured silicon substrates by ALD. Photoluminescence measurements indicate high crystalline quality of the ZnO film after annealing. Current-voltage (I-V) measurements of the ZnO/p-Si heterodiodes in dark show a non-linear behavior with unusual high current values in reverse bias. Under illumination photocurrent is observed for reverse bias, even for wavelengths below the silicon bandgap in the case of the laser-microstructured photodetectors. Higher current values are measured for the microstructured photodetectors, compared to planar ones.Photoconductivity measurements show enhanced responsivity across the UV-Vis-NIR spectral range for the laser-microstructured devices, due to their increased surface area and light absorption.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Section: Structure and Surface Morphologymentioning

confidence: 99%

Laser-Microstructured ZnO/p-Si Photodetector with Enhanced and Broadband Responsivity across the Ultraviolet–Visible–Near-Infrared Range

Chatzigiannakis

Jaros

Leturcq

et al. 2020

ACS Appl. Electron. Mater.

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“…The average height of the spikes is 35 ± 4 μm, the average half-height width 11 ± 2 μm, and the average distance between neighboring spikes 16 ± 2 μm center-to-center, which results in a spike density of 8.6*10 5 spikes/cm 2 . This morphology was obtained when irradiating silicon in SF6 ambient with a fluence of 1 J/cm 2 and translating the silicon surface with respect to the laser beam with a speed such that each spot on the silicon surface was irradiated by 1000 laser pulses [59,60]. At this fluence, this is the result of melting, ablation, and interference effects that occur upon nanosecond laser irradiation of silicon in SF6 environment [55,56].…”

Section: A Mda-mb-231 Cell Culturing On Microstructured Substratesmentioning

confidence: 99%

Regulating MDA-MB-231 breast cancer cell adhesion on laser-patterned surfaces with micro- and nanotopography

et al. 2022

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Breast cancer is the most common type of cancer observed in women. Communication with the tumor microenvironment allows invading breast cancer cells, such as triple negative breast cancer cells, to adapt to specific substrates. The substrate topography modulates the cellular behavior among other factors. Several different materials and micro/nanofabrication techniques have been employed to develop substrates for cell culture. Silicon-based substrates present a lot of advantages as they are amenable to a wide range of processing techniques and they permit rigorous control over the surface structure. We investigate and compare the response of the triple negative breast cancer cells (MDA-MB-231) on laser-patterned silicon substrates with two different topographical scales, i.e., the micro- and the nanoscale, in the absence of any other biochemical modification. We develop silicon surfaces with distinct morphological characteristics by employing two laser systems with different pulse durations (nanosecond and femtosecond) and different processing environments (vacuum, SF6 gas, and water). Our findings demonstrate that surfaces with microtopography are repellent, while those with nanotopography are attractive for MDA-MB-231 cell adherence.

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“…Functional surfaces allow us to modify the surface of a material to maintain the desired functions from external agents, avoid the deposition of substances, improve the properties' efficiency, or achieve new functions that could not be found on the original materials [1][2][3][4]. The applications of functional surfaces are extremely wide owing to the ease of texturing process and advanced techniques.…”

Section: Introductionmentioning

confidence: 99%

Facile Approach for Omniphobic and Anti-icing on Fe Surface

et al. 2023

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The functionalized process refers to a new concept, which aims to modify the physical and chemical properties of the original surface for specific purposes. Hence, the functional surfaces will introduce the desired properties that can not be found in the original material. The various applications might be named liquid repellent, anti-icing, anti-reflection, water harvesting, anti-biofouling, etc. This study proposes a simple and fast fabrication method based on etching incorporated with low surface energy chemical compound coating to functionalize the Iron (Fe) surface for omniphobic and anti-icing characteristics. After being functionalized, the surface reveals an omniphobic state with various liquids and extremely low adhesion to ice bulk. The research might suggest solutions for manufacturing functional surfaces oriented to outdoor applications such as windshields, rearview mirrors, anti-fouling surfaces, etc

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Functional surfaces of laser-microstructured silicon coated with thermoresponsive PS/PNIPAM polymer blends: Switching reversibly between hydrophilicity and hydrophobicity

Cited by 16 publications

References 48 publications

Laser-Microstructured ZnO/p-Si Photodetector with Enhanced and Broadband Responsivity across the Ultraviolet–Visible–Near-Infrared Range

Laser-Microstructured ZnO/p-Si Photodetector with Enhanced and Broadband Responsivity across the Ultraviolet–Visible–Near-Infrared Range

Regulating MDA-MB-231 breast cancer cell adhesion on laser-patterned surfaces with micro- and nanotopography

Facile Approach for Omniphobic and Anti-icing on Fe Surface

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