Tunable Properties of Porous Silicon

Canham, Leigh

doi:10.1007/978-3-319-04508-5_19-2

Cited by 11 publications

(15 citation statements)

References 49 publications

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“…Both fresh Macro‐ and Meso‐PSi structures demonstrate hydrophobic behavior due to the calculated water contact angle of 131 ± 4 o and 124 ±3 o , respectively. This arises from the presence of Si–H x bonds on the surface of fresh PSi . However, surface oxidation decreases the water contact angle to 44 ± 2 o in Macro‐PSi and to 31 ± 4 o in Meso‐PSi and gives them the hydrophilic property.…”

Section: Resultsmentioning

confidence: 99%

“…This rise in osteocalcin attachment intensifies the interactions in next steps, followed by more color production in the final step. Second, the surface of fresh PSi covered by Si–H x bonds tends to participate in the oxidation–reduction process and is oxidized especially in water environment . Thus, it can be speculated that this surface is involved in the oxidation–reduction process between HRP and TMB in the final step, disturbs desirable reactions, and eventually reduces the amount of conversion of TMB into colored products.…”

Section: Resultsmentioning

confidence: 99%

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A novel approach for osteocalcin detection by competitive ELISA using porous silicon as a substrate

Rahimi

Arough

Yaghoobi

et al. 2017

Biotech and App Biochem

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In this study, porous silicon (PSi) was utilized instead of prevalent polystyrene platforms, and its capability in biomolecule screening was examined. Here, two types of porous structure, macroporous silicon (Macro-PSi) and mesoporous silicon (Meso-PSi), were produced on silicon wafers by electrochemical etching using different electrolytes. Moreover, both kinds of fresh and oxidized PSi samples were investigated. Next, osteocalcin as a biomarker of the bone formation process was used as a model biomarker, and the colorimetric detection was performed by competitive enzyme-linked immunosorbent assay (ELISA). Both Macro-PSi and Meso-PSi substrates in the oxidized state, specifically the Meso-porous structure, were reported to have higher surface area to volume ratio, more capacitance of surface-antigen interaction, and more ability to capture antigen in comparison with the prevalent platforms. Moreover, the optical density signal of osteocalcin detected by the ELISA technique was notably higher than the common platforms. Based on the findings of this study, PSi can potentially be used in the ELISA to achieve better results and consequently more sensitivity. A further asset of incorporating such a nanometer structure in the ELISA technique is that the system response to analyte concentration could be maintained by consuming lower monoclonal antibody (or antigen) and consequently reduces the cost of the experiment.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

A novel approach for osteocalcin detection by competitive ELISA using porous silicon as a substrate

Rahimi

Arough

Yaghoobi

et al. 2017

Biotech and App Biochem

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“…The development of porous silicon gave a new dimension to technologies which based on porous silicon, in 1990 and the discovery of photoluminescence at room temperature of porous silicon by Canham [7], did not use bulk silicon in the field of light sources (LED), Because silicon is a semi-conductor material, with an indirect band gap, therefore the light fluorescence occurs at room temperature very small . The importance of porous silicon is not limited by photovoltaic applications but depends on its properties as a crystal with a bright light , which changes the optical properties and absorption, optical reflectivity, making it sensitive to specific wavelengths and useful in optical applications.…”

Section: Nano Porous Siliconmentioning

confidence: 99%

Effect of photo chemical etching and electro chemical etching on the topography of porous silicon wafers surfaces

Jassem¹

2019

Tikrit J. Pure Sci.

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In This research we study the effect of photo chemical etching and electrochemical etching on topography of porous silicon surfaces, the results showed that photo chemical etching produced roughness silicon layer which can have thickness be less of porous silicon layer which is produced by electro chemical etching When all the wafers have same etching time and hydrofluoric solution (HF) concentration, the wafers have same resistance (10 Ω.cm). Also the results showed the roughness of porous silicon layers produced by electro chemical method which is bigger than the roughness of porous silicon layers produced by photo chemical method and the results of roughness of porous silicon layers, Pore diameter and porous layer thickness were produced by electro chemical method (1.55(µm) ((0.99(µm)) and ((1.21(µm) respectively), the results of roughness of porous silicon layers, Pore diameter and porous layer thickness were produced by photo chemical method 0.63)) nm -1.55)) (µm) ),so the (84.9 (nm)- and (3.94(nm) respectively . This is reinforces because of using the electro chemical to etching the wafer surf ace of bulk silicon and changing it to roughness silicon surface be share in success of many practicalities.

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“…[1][2][3][4] Porous silicon (PS) has all the advantages of silicon: it is easy to miniaturise and has low cost. [5][6][7][8] The enhanced surface area due to the porous structure, would result in an increase in the measured signal strength which would allow scaling down of the sensor area. Thus it is an ideal candidate for the fabrication of nanoscale biochemical sensors leading to rapid and real time monitoring with high sensitivity and reusability.…”

Section: Introductionmentioning

confidence: 99%

Nanostructured semiconductor based biochemical sensors

Betty¹

2016

Materials Science and Technology

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Nanostructured materials possess better tunability of their properties compared to their bulk counterparts. These properties have opened up new avenues for fabricating highly sensitive, miniaturised and cost effective sensing devices. For the realisation of a rapid and easy to use immunosensor, nanostructured porous silicon/polyaniline heterostructure has been prepared electrochemically which provides label free, real time electrical detection with high sensitivity for biomolecules (mouse IgG/goat antimouse IgG) from whole serum. Nanostructured thin film SnO 2 sensors prepared by Langmuir Blodgett technique has been investigated for room temperature gas sensing under various chemically polluting ambiances (NH 3 , H 2 S, SO 2 , CO, H 2 , NO 2 and CH 4 ) using electrochemical methods which were able to detect specific gases at room temperature in the presence of other residual gases.

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Tunable Properties of Porous Silicon

Cited by 11 publications

References 49 publications

A novel approach for osteocalcin detection by competitive ELISA using porous silicon as a substrate

A novel approach for osteocalcin detection by competitive ELISA using porous silicon as a substrate

Effect of photo chemical etching and electro chemical etching on the topography of porous silicon wafers surfaces

Nanostructured semiconductor based biochemical sensors

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