Nanoporous silicon matrix used as biomaterial

Simion, Monica; Kleps, I.; Neghina, Teodora; Angelescu, A.; Miu, M.; Brăgaru, Adina; Dănilă, M.; Condac, Eduard; Costache, Marieta; Savu, Lorand

doi:10.1016/j.jallcom.2006.08.093

Cited by 15 publications

(5 citation statements)

References 5 publications

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“…However, a very high-bias regime induces local heating effects that focus charge carriers to the pore tips, considerably enlarging their diameters and imposing a limited process duration. Herein, based on our previous experience in fabricating porous silicon [ 29 ], a porosification procedure for Au was established using a constant applied current that can be generated with maximum 2.5 V bias, with the process being monitored after different periods of time, from 200 to 1000 s, when, lately, the entire gold film was deeply nanostructured. The obtained NPG films were characterized by means of scanning electron microscopy and correlated with the X-ray diffraction studies in order to obtain morpho-structural information (i.e., porosity, ligament diameter, and surface area) and to propose a mechanism of porosification under constant current anodization.…”

Section: Introductionmentioning

confidence: 99%

From Chip Size to Wafer-Scale Nanoporous Gold Reliable Fabrication Using Low Currents Electrochemical Etching

et al. 2020

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We report a simple, scalable route to wafer-size processing for fabrication of tunable nanoporous gold (NPG) by the anodization process at low constant current in a solution of hydrofluoric acid and dimethylformamide. Microstructural, optical, and electrochemical investigations were employed for a systematic analysis of the sample porosity evolution while increasing the anodization duration, namely the small angle X-ray scattering (SAXS) technique and electrochemical impedance spectroscopy (EIS). Whereas the SAXS analysis practically completes the scanning electronic microscopy (SEM) investigations and provides data about the impact of the etching time on the nanoporous gold layers in terms of fractal dimension and average pore surface area, the EIS analysis was used to estimate the electroactive area, the associated roughness factor, as well as the heterogeneous electron transfer rate constant. The bridge between the analyses is made by the scanning electrochemical microscopy (SECM) survey, which practically correlates the surface morphology with the electrochemical activity. The results were correlated to endorse the control over the gold film nanostructuration process deposited directly on the substrate that can be further subjected to different technological processes, retaining its properties. The results show that the anodization duration influences the surface area, which subsequently modifies the properties of NPG, thus enabling tuning the samples for specific applications, either optical or chemical.

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Section: Introductionmentioning

confidence: 99%

From Chip Size to Wafer-Scale Nanoporous Gold Reliable Fabrication Using Low Currents Electrochemical Etching

et al. 2020

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“…Por-Si with a developed pore system and, as a consequence, a large area of the inner surface, is promising for various medical applications, as well as other porous nanomaterials. An additional advantage is its biocompatibility, while the por-Si can be both bioresistant and bio-resorbable, and its dissolution products are non-toxic [1,2]. Promising areas of por-Si application in medicine may include the creation of a microchip of the artificial retina [3], the destruction of cancer cells using por-Si nanoparticles [4,5], the cultivation of biological tissues on the por-Si surface [6,7], the creation of nanostructured containers for drug delivery [8,9], ultra-sensitive biosensors [10,11], and much more.…”

Section: Introductionmentioning

confidence: 99%

IR spectra of porous silicon based nanocomposites

Ganichkina

Suyundukova

Latukhina

2019

J-BPE

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The article is devoted to the problem of using porous silicon (por-Si) as a biomaterial. IR spectroscopy was used to study the composition of por-Si samples and nanocomposites: por-Si with hydroxyapatite, promising as a biomaterial for osteoplasty and por-Si with glucose (for biosensor). The studies were carried out on the FSM 2201 Fourier spectrometer using the diffuse reflection prefix and Perkin Elmer Spectrum 100 using the total internal reflection violation prefix. A comparative analysis of the results shows a noticeable difference between the IR spectra of nanocomposites and the IR spectrum of the original por-Si and allows to identify the substance in the pores.

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“…The previous works allow us to choose the proper conditions in order to obtain the PS substrate for the S-layer attachment with a certain porosity and structure [21,22]. Thus, the PS layer substrate were realised on p-type Si with (100) orientation using the following process parameters: 25% concentration HF ethanoic solution, and the current density, between 2-14 mA/cm 2 .…”

Section: Introductionmentioning

confidence: 99%

Protein‐mesoporous silicon matrix obtained by S‐layer technology

Kleps

Ignat

Miu

et al. 2009

Phys. Status Solidi (c)

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Protein layers on porous silicon (PS) substrates were prepared using haloarchaea strain Haloferax sp. as S‐layer subunits. The attaching of S‐layer at PS samples was performed by immersing the PS samples in S‐layer solution in sterile conditions, followed by 24 hours incubation at two temperatures, 4 and 24 °C. Spectrophotometric determination of the S‐layer attachment on the porous silicon substrate was performed at 280 nm wavelength by measuring the protein concentration in solution before and after the incubation of PS samples. The protein layer morphology on the PS substrate was investigated by electron microscopy. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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Nanoporous silicon matrix used as biomaterial

Cited by 15 publications

References 5 publications

From Chip Size to Wafer-Scale Nanoporous Gold Reliable Fabrication Using Low Currents Electrochemical Etching

From Chip Size to Wafer-Scale Nanoporous Gold Reliable Fabrication Using Low Currents Electrochemical Etching

IR spectra of porous silicon based nanocomposites

Protein‐mesoporous silicon matrix obtained by S‐layer technology

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