Porous Silicon Sensors - from Single Layers to Multilayer Structures

Lugo, J. E.; Ocampo, M.; Doti, R.; Faubert, Jocelyn

doi:10.5772/16499

Cited by 5 publications

(7 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Interest in such materials is driven by their high versatility: the nanopores offer an intrinsic filtering ability as “nanoscale sieves”, enabling steric targeting of analytes, they are also highly amenable to selective chemical functionalization, and the porous structure dramatically increases the surface area for binding events and chemical reactions . Sensor designs have been proposed, based on single layers, based on pure DBRs, , or under attenuated total reflection illumination, with so-called Bloch surface waves; our proposed structure presents the advantages of a sharp spectral response, direct coupling at normal incidence, and facile fabrication and requires fewer layers than a pure-dielectric cavity (one of the mirrors having been replaced, in effect, by a metal layer). Furthermore, the sol–gel technique used to obtain the porous oxides is highly versatile; the layers can be easily tuned in thickness, porosity, and chemical composition (simple or mixed oxides, hybrid materials, etc.)…”

mentioning

confidence: 99%

Tamm Plasmon Resonance in Mesoporous Multilayers: Toward a Sensing Application

et al. 2014

View full text Add to dashboard Cite

A novel optical sensor is proposed, based on the normal-incidence excitation of Tamm plasmons at the interface between a multilayer of porous SiO 2 and TiO 2 , acting as a permeable Bragg reflector, and a flat gold film.Transmittance spectra reveal a sharp Tamm mode within the stop-band of the distributed Bragg reflector, the spectral position of which was monitored upon exposure to various solvents, demonstrating the sensitivity of the device to changes of refractive index.

show abstract

mentioning

confidence: 99%

Tamm Plasmon Resonance in Mesoporous Multilayers: Toward a Sensing Application

et al. 2014

View full text Add to dashboard Cite

show abstract

“…Once the appropriate chemical functionalization and porous distribution size is obtained, the challenge then becomes transducing the recognition of the biological analytes into a measurable signal. The requirements for efficient transduction are precision (same response to the same stimuli: repeatability) and accuracy (indicating magnitude value as close as possible to the real magnitude of the stimulus to be sensed: minimum absolute error spread) [30].…”

Section: Porous Silicon Biosensors: Construction and Transduction Primentioning

confidence: 99%

“…Some biological systems studied with these biosensors are: DNA hybridization [22,32,33], antibody cascading and the prototypical biotinstreptavidin interaction [22]. Using an analogous optical transduction modality it is possible to build p-Si biosensors with others complex optical structures as multilayer devices [6,30].…”

Section: Optical P-si Biosensorsmentioning

confidence: 99%

“…These can be built up by alternating the applied current densities during the electrochemical etching generating a periodic or quasiperiodic combination of refractive indices [6]. This kind of structures offers better reflectance spectra (without side lobes) if compared with a mono or doubled-layered structure [30]. The etching parameters must be chosen to accommodate the analyte of interest whilst maximising the optical response.…”

Section: Optical P-si Biosensorsmentioning

confidence: 99%

See 1 more Smart Citation

Porous Silicon Biosensors

Mora¹,

Ocampo²,

Doti³

et al. 2013

State of the Art in Biosensors - General Aspects

Self Cite

View full text Add to dashboard Cite

“…An attractive inorganic substrate for the development of innovative hybrid materials is porous silicon (PSi). PSi has been studied for a very wide range of applications, going from biomedical devices 18 to biosensors 19 – 22 , to drug delivery systems 23 – 28 and to optoelectronics 29 , 30 . In the field of energy applications, PSi has been used as an antireflection coating for crystalline Si 31 – 34 and the realization of plasmonic layers for solar cells and sensing has been explored 35 , 36 .…”

Section: Introductionmentioning

confidence: 99%

The interplay of chemical structure, physical properties, and structural design as a tool to modulate the properties of melanins within mesopores

Pira

Amatucci

Melis

et al. 2022

Sci Rep

View full text Add to dashboard Cite

The design of modern devices that can fulfil the requirements for sustainability and renewable energy applications calls for both new materials and a better understanding of the mixing of existing materials. Among those, surely organic–inorganic hybrids are gaining increasing attention due to the wide possibility to tailor their properties by accurate structural design and materials choice. In this work, we’ll describe the tight interplay between porous Si and two melanic polymers permeating the pores. Melanins are a class of biopolymers, known to cause pigmentation in many living species, that shows very interesting potential applications in a wide variety of fields. Given the complexity of the polymerization process beyond the formation and structure, the full understanding of the melanins' properties remains a challenging task. In this study, the use of a melanin/porous Si hybrid as a tool to characterize the polymer’s properties within mesopores gives new insights into the conduction mechanisms of melanins. We demonstrate the dramatic effect induced on these mechanisms in a confined environment by the presence of a thick interface. In previous studies, we already showed that the interactions at the interface between porous Si and eumelanin play a key role in determining the final properties of composite materials. Here, thanks to a careful monitoring of the photoconductivity properties of porous Si filled with melanins obtained by ammonia-induced solid-state polymerization (AISSP) of 5,6-dihydroxyindole (DHI) or 1,8-dihydroxynaphthalene (DHN), we investigate the effect of wet, dry, and vacuum cycles of storage from the freshly prepared samples to months-old samples. A computational study on the mobility of water molecules within a melanin polymer is also presented to complete the understanding of the experimental data. Our results demonstrate that: (a) the hydration-dependent behavior of melanins is recovered in large pores (≈ 60 nm diameter) while is almost absent in thinner pores (≈ 20 nm diameter); (b) DHN-melanin materials can generate higher photocurrents and proved to be stable for several weeks and more sensitive to the wet/dry variations.

show abstract

Porous Silicon Sensors - from Single Layers to Multilayer Structures

Cited by 5 publications

References 25 publications

Tamm Plasmon Resonance in Mesoporous Multilayers: Toward a Sensing Application

Tamm Plasmon Resonance in Mesoporous Multilayers: Toward a Sensing Application

Porous Silicon Biosensors

The interplay of chemical structure, physical properties, and structural design as a tool to modulate the properties of melanins within mesopores

Contact Info

Product

Resources

About