Fabrication of porous silicon based tunable distributed Bragg reflectors by anodic etching of irradiated silicon

Vendamani, V.S.; Dang, Zhiya; Ramana, P.V.; Pathak, A. P.; Kumar, V.V. Ravi Kanth; Breese, Mark B. H.; Rao, S. Venugopal

doi:10.1016/j.nimb.2015.05.040

Cited by 13 publications

(8 citation statements)

References 22 publications

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“…Porous silicon (PS), since its discovery [ 1 – 4 ], has had huge development for various applications, like gas sensors [ 5 ], solar cells [ 6 , 7 ], Bragg reflectors [ 8 ], biosensors [ 9 – 12 ], photocatalysis [ 13 ], tissue engineering [ 14 ], and cell growth [ 15 – 18 ], among others. Particularly, the last two applications have attracted researcher interest in studying the properties of PS as a host matrix Hydroxyapatite (HA) and its implementation in the development of processes leading to bone regeneration.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of porous silicon as hydroxyapatite host matrix of biomedical applications

et al. 2017

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In this work, porous-silicon samples were prepared by electrochemical etching on p-type (B-doped) Silicon (Si) wafers. Hydrofluoric acid (HF)-ethanol (C2H5OH) [HF:Et] and Hydrofluoric acid (HF)-dimethylformamide (DMF-C3H7NO) [HF:DMF] solution concentrations were varied between [1:2]—[1:3] and [1:7]—[1:9], respectively. Effects of synthesis parameters, like current density, solution concentrations, reaction time, on morphological properties were studied by scanning electron microscopy (SEM) and atomic force microscopy (AFM) measurements. Pore sizes varying from 20 nm to micrometers were obtained for long reaction times and [HF:Et] [1:2] concentrations; while pore sizes in the same order were observed for [HF:DMF] [1:7], but for shorter reaction time. Greater surface uniformity and pore distribution was obtained for a current density of around 8 mA/cm2 using solutions with DMF. A correlation between reflectance measurements and pore size is presented. The porous-silicon samples were used as substrate for hydroxyapatite growth by sol-gel method. X-ray diffraction (XRD) and SEM were used to characterize the layers grown. It was found that the layer topography obtained on PS samples was characterized by the evidence of Hydroxyapatite in the inter-pore regions and over the surface.

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Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of porous silicon as hydroxyapatite host matrix of biomedical applications

et al. 2017

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“…As a result, etching time and current density may be employed to alter the size and form of the final pore structures. [16,17]. The average pore diameter was mention in Table 1 for PSi at J=12 and 30 mA/cm 2 .and there is shows that the pore diameter and roughness of the surface increase with the increasing of etching current densities The SEM test was used to analyze the surface morphology of PSi samples.…”

Section: Resultsmentioning

confidence: 99%

The Effect of Current Density on the Properties of Porous Silicon Gas Sensor for Ethanol and Methanol Vapour Detection

Kareem¹,

M.²,

Hussein³

2021

JASN

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In this paper, Gas sensors for ethanol and methanol were created utilizing porous silicon (PSi).n-type silicon was employed for all PSi samples, photo-electrochemical etching technique (PECE) was used to prepare porous surface. The intensity of the three etchings current densities was 12, 24 and 30 mA / cm 2 , with 40% hydrofluoric acid concentration (HF) and a time of etching 10 minutes. Porous silicon (100) has been strictly studied by the structure and formation of surface bonding of the PSi layer; the structural properties, morphological characteristics, pore diameter, and roughness were described using Xray diffraction (XRD), atomic force microscopy (AFM) and scanning electron microscopy (SEM). All PSi samples were applied as a sensor for ethanol and methanol at room temperature. The results showed that the best sensitivity of PSi was to ethanol gas compared to methane under the same used conditions at etching current density 30mA/cm2, reaching about 1.809 at a concentration of 500 ppm. From these results, the PSi layers act as high-quality, low-cost gas sensors. It can be used as a replacement for expensive material that is used as gas sensors, which operate at low temperatures, including room temperature. The interest in this material is due to study the effect of extremely high surface to volume ratio (increasing surface area), and easy manufactured and compatibility with modern silicon microelectronics manufacturing technologies.

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“…314 These pSi multilayers were also widely used to fabricate Bragg reflectors to illuminate various wavelengths of lights. 315 In this context, a recent report by Nguyen and group proposed pSi and pSi-PC for improved trace level MO detection. 316 The integration of AgNPs on pSi and pSi-PC has been performed by an immersion technique.…”

Section: Plasmonic Nps Capped Nanocrystalline Porous Siliconmentioning

confidence: 99%

“…In addition, pSi-based multilayer structures produce 5–8-fold improvement in the Raman signal . These pSi multilayers were also widely used to fabricate Bragg reflectors to illuminate various wavelengths of lights Figure a represents the (a) Bragg reflectors illuminating at different colors and (b) the corresponding FESEM and (c) reflectivity spectra.…”

Section: Plasmonic Nps Capped Nanocrystalline Porous Siliconmentioning

confidence: 99%

Silicon Nanostructures for Molecular Sensing: A Review

Vendamani

Rao

Pathak

2022

ACS Appl. Nano Mater.

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This review presents a comprehensive synopsis of the recent developments and achievements in the research of nanosensors composed of plasmonic nanoparticles (NPs) and silicon nanostructures (NSs) for effective trace-level molecular detection. This review focuses intensively on the methodologies for the preparation and enforcement of a variety of SiNSs including (a) metal nanoparticles decorated silicon nanowires (NWs), (b) metal nanodendrites (NDs) on Si substrate, (c) plasmonic NPs decorated nanocrystalline porous silicon (pSi), and (d) silicon composed hybrid nanostructures with favorable parameters of importance in sensing. Furthermore, their potency in wide molecular sensing applications, especially chemical, biological, and explosive molecules based on surface enhanced Raman scattering (SERS) phenomenon is discussed in detail. Various demonstrations and categorizations are provided on the topic of Si-based NSs for a clear understanding to diverse readers. A roadmap is also provided at the end for achieving superior sensing materials or devices in the future.

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Fabrication of porous silicon based tunable distributed Bragg reflectors by anodic etching of irradiated silicon

Cited by 13 publications

References 22 publications

Synthesis and characterization of porous silicon as hydroxyapatite host matrix of biomedical applications

Synthesis and characterization of porous silicon as hydroxyapatite host matrix of biomedical applications

The Effect of Current Density on the Properties of Porous Silicon Gas Sensor for Ethanol and Methanol Vapour Detection

Silicon Nanostructures for Molecular Sensing: A Review

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