Porous Silicon Nanowire Arrays for Reversible Optical Gas Sensing

Georgobiani, Veronika A.; Gonchar, K. A.; Zvereva, E.A.; Осминкина, Л. А.

doi:10.1002/pssa.201700565

Cited by 18 publications

(18 citation statements)

References 35 publications

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“…In recent years, nano-Si has been widely used for optical (bio)sensor applications due to its portability and high sensitivity. Among all of the optical detection approaches, photoluminescence (PL)-based measurement looks the most promising, especially for real-time monitoring [3,18,19,72,78,81,82,83,84]. Previously, we reported on low-cost, highly sensitive PSi-based immunosensors for ochratoxin A (OTA) detection using a PL approach.…”

Section: (Bio)sensors Based On Psi Sinws Sinps and Their Composimentioning

confidence: 99%

“…The sensor mechanism was based on the effect of PL changing with the varying pH of the solution caused by the enzymatic reactions [18]. Furthermore, it was reported that the PL-based detection approach could be utilized for O 2 detection on a SiNW platform [84]. SiNWs were fabricated by the MACE method and O 2 detection was carried out through the measurement of different oxygen flow pressure.…”

Section: (Bio)sensors Based On Psi Sinws Sinps and Their Composimentioning

confidence: 99%

See 1 more Smart Citation

Nanosilicon-Based Composites for (Bio)sensing Applications: Current Status, Advantages, and Perspectives

Myndrul

Iatsunskyi

2019

Materials

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This review highlights the application of different types of nanosilicon (nano-Si) materials and nano-Si-based composites for (bio)sensing applications. Different detection approaches and (bio)functionalization protocols were found for certain types of transducers suitable for the detection of biological compounds and gas molecules. The importance of the immobilization process that is responsible for biosensor performance (biomolecule adsorption, surface properties, surface functionalization, etc.) along with the interaction mechanism between biomolecules and nano-Si are disclosed. Current trends in the fabrication of nano-Si-based composites, basic gas detection mechanisms, and the advantages of nano-Si/metal nanoparticles for surface enhanced Raman spectroscopy (SERS)-based detection are proposed.

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Section: (Bio)sensors Based On Psi Sinws Sinps and Their Composimentioning

confidence: 99%

Section: (Bio)sensors Based On Psi Sinws Sinps and Their Composimentioning

confidence: 99%

Nanosilicon-Based Composites for (Bio)sensing Applications: Current Status, Advantages, and Perspectives

Myndrul

Iatsunskyi

2019

Materials

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“…The surface of the nanowires is coated with a thin oxide layer, which is formed during their preparation. This oxide layer protects the nanowires from further oxidation due to contact with environmental molecules, including atmospheric gases and water under normal environmental conditions [13,14]. The properties of light interference in the layers of Si NWs shown can be used to detect protein A and sucrose [15].…”

Section: Introductionmentioning

confidence: 99%

H1N1 influenza virus interaction with a porous layer of silicon nanowires

Gonchar

Agafilushkina

Moiseev

et al. 2020

Mater. Res. Express

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Here, the non-specific interaction of the H1N1 influenza virus with a porous layer of silicon nanowires (PSi NWs) was studied by transmission and scanning electron microscopy (TEM, SEM, respectively) and optical spectroscopy. PSi NW layer with a thickness of about 200 nm was fabricated by metalassisted chemical etching of p-type highly doped crystalline silicon wafers, and consist of porous nanowires with a diameter of 50-200 nm, and a distance between the nanowires of 100-200 nm. It was shown that during the adsorption of viruses, viral particles with a diameter of about 100 nm bind to the porous surface of the nanowires. This interaction was revealed using TEM, SEM, and causes wavelength shifts in the Fabry-Perot fringes in the reflection spectrum of visible light from the PSi NW layer. The results show that thin layers of PSi NWs are a promising nanomaterial for creating filters and sensors for binding and detection of viruses.

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“…In recent decades, the possibility of using silicon nanowires (SiNWs) in sensorics (Cui et al, 2001; Wang and Ozkan, 2008; Cao et al, 2015; Georgobiani et al, 2018), photovoltaics (Kelzenberg et al, 2008; Stelzner et al, 2008; Sivakov et al, 2009), photonics (Brönstrup et al, 2010), and micro-and optoelectronics (Föll et al, 2010; Yang et al, 2010) has been shown. Nanowires are usually obtained as a result of anisotropic growth of a 1D crystal on a nanometer scale.…”

Section: Introductionmentioning

confidence: 99%

Structural and Optical Properties of Silicon Nanowire Arrays Fabricated by Metal Assisted Chemical Etching With Ammonium Fluoride

et al. 2019

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Here we report on the metal assisted chemical etching method of silicon nanowires (SiNWs) manufacturing, where the commonly used hydrofluoric acid (HF) has been successfully replaced with ammonium fluoride (NH4F). The mechanism of the etching process and the effect of the pH values of H2O2: NH4F solutions on the structural and optical properties of nanowires were studied in detail. By an impedance and Mott-Schottky measurements it was shown that silver-assisted chemical etching of silicon can be attributed to a facilitated charge carriers transport through Si/SiOx/Ag interface. It was shown that the shape of nanowires changes from pyramidal to vertical with pH decreasing. Also it was established that the length of SiNW arrays non-linearly depends on the pH for the etching time of 10 min. A strong decrease of the total reflectance to 5–10% was shown for all the studied samples at the wavelength <800 nm, in comparison with crystalline silicon substrate (c-Si). At the same time, the intensities of the interband photoluminescence and the Raman scattering of SiNWs are increased strongly in compare to c-Si value, and also they were depended on both the length and the shape of SiNW: the biggest values were for the long pyramidal nanowires. That can be explained by a strong light scattering and partial light localization in SiNWs. Hereby, arrays of SiNWs, obtained by using weakly toxic ammonium fluoride, have great potential for usage in photovoltaics, photonics, and sensorics.

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Porous Silicon Nanowire Arrays for Reversible Optical Gas Sensing

Cited by 18 publications

References 35 publications

Nanosilicon-Based Composites for (Bio)sensing Applications: Current Status, Advantages, and Perspectives

Nanosilicon-Based Composites for (Bio)sensing Applications: Current Status, Advantages, and Perspectives

H1N1 influenza virus interaction with a porous layer of silicon nanowires

Structural and Optical Properties of Silicon Nanowire Arrays Fabricated by Metal Assisted Chemical Etching With Ammonium Fluoride

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