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      Thermally promoted addition of undecylenic acid on thermally hydrocarbonized porous silicon optical reflectors

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          Abstract

          Thermally promoted addition of undecylenic acid is studied as a method for modifying porous silicon optical reflectors that have been pre-treated with thermal hydrocarbonization. Successful derivatization of undecylenic acid is demonstrated and confirmed with Fourier transform infrared and X-ray photoelectron spectroscopies. The results indicate that the hydrocarbonization pre-treatment considerably improves stability against oxidation and chemical dissolution in basic environments. The two-step treatment also does not cause an appreciable change on sample reflectance spectra, which enables the use of the functionalized structures in optical sensing applications.

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          A porous silicon-based optical interferometric biosensor.

          V. Lin, K Motesharei, K P Dancil … (1997)
          A biosensor has been developed based on induced wavelength shifts in the Fabry-Perot fringes in the visible-light reflection spectrum of appropriately derivatized thin films of porous silicon semiconductors. Binding of molecules induced changes in the refractive index of the porous silicon. The validity and sensitivity of the system are demonstrated for small organic molecules (biotin and digoxigenin), 16-nucleotide DNA oligomers, and proteins (streptavidin and antibodies) at pico- and femtomolar analyte concentrations. The sensor is also highly effective for detecting single and multilayered molecular assemblies.
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            Porous silicon biosensors on the advance.

            Andrew Jane, Roman Dronov, Alastair Hodges … (2009)
            Biosensor research is a rapidly expanding field with an immense market potential spanning a broad spectrum of applications including biomedical diagnostics, environmental monitoring, veterinary and food quality control. Porous silicon (pSi) is a nanostructured material poised to take centre stage in the biosensor development effort. This can be ascribed to the ease and speed of fabrication, remarkable optical and morphological properties of the material (including tuneable pore size and porosity), large internal surface area and the versatile surface chemistry. The past decade has, therefore, seen diverse proof-of-principle studies involving pSi-based optical and electrochemical transducers, which are highlighted here. We also provide comparative analysis of transducer sensitivity, robustness and susceptibility to interferences and cover strategies for sensitivity enhancement by means of signal amplification.
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              Biosensing using porous silicon double-layer interferometers: reflective interferometric Fourier transform spectroscopy.

              Gordon M Miskelly, Frédérique Cunin, Claudia Pacholski … (2005)
              A simple, chip-based implementation of a double-beam interferometer that can separate biomolecules based on size and that can compensate for changes in matrix composition is introduced. The interferometric biosensor uses a double-layer of porous Si comprised of a top layer with large pores and a bottom layer with smaller pores. The structure is shown to provide an on-chip reference channel analogous to a double-beam spectrometer, but where the reference and sample compartments are stacked one on top of the other. The reflectivity spectrum of this structure displays a complicated interference pattern whose individual components can be resolved by fitting of the reflectivity data to a simple interference model or by fast Fourier transform (FFT). Shifts of the FFT peaks indicate biomolecule penetration into the different layers. The small molecule, sucrose, penetrates into both porous Si layers, whereas the large protein, bovine serum albumin (BSA), only enters the large pores. BSA can be detected even in a large (100-fold by mass) excess of sucrose from the FFT spectrum. Detection can be accomplished either by computing the weighted difference in the frequencies of two peaks or by computing the ratio of the intensities of two peaks in the FFT spectrum.
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                Author and article information

                Journal
                Journal ID (nlm-ta): Nanoscale Res Lett
                Journal ID (iso-abbrev): Nanoscale Res Lett
                Title: Nanoscale Research Letters
                Publisher: Springer
                ISSN (Print): 1931-7573
                ISSN (Electronic): 1556-276X
                Publication date Collection: 2012
                Publication date (Electronic): 19 June 2012
                Volume: 7
                Issue: 1
                Page: 311
                Affiliations
                [1 ]Institute of Advanced Energy, Kyoto University, Uji, Kyoto, 611-0011, Japan
                [2 ]Department of Physics and Astronomy, University of Turku, Turku, FI-20014, Finland
                [3 ]Turku University Centre for Materials and Surfaces, University of Turku, Turku, FI-20014, Finland
                Article
                Publisher ID: 1556-276X-7-311
                DOI: 10.1186/1556-276X-7-311
                PMC ID: 3431257
                PubMed ID: 22713167
                SO-VID: c7f246aa-82fb-4641-a5a2-7e2023cacf38
                Copyright © Copyright ©2012 Jalkanen et al.; licensee Springer.
                License:

                This is an Open Access article distributed under the terms of the Creative Commons Attribution License ( http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

                History
                Date received : 5 April 2012
                Date accepted : 30 May 2012
                Categories
                Subject: Nano Express

                ScienceOpen disciplines: Nanomaterials
                Keywords: optical microcavity,chemical stability,interference filter,porous silicon
                Data availability:
                ScienceOpen disciplines: Nanomaterials
                Keywords: optical microcavity, chemical stability, interference filter, porous silicon

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