Effects of thermal oxidation on the photoluminescence properties of porous silicon

Nakamura, Toshihiro; Ogawa, Toshikazu; Hosoya, N.; Adachi, Sadao

doi:10.1016/j.jlumin.2009.11.018

Cited by 25 publications

(12 citation statements)

References 29 publications

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“…The latter results from the improved surface quality by the formation of a high-quality SiO 2 layer. 27 In fact, the XPS data in Fig. 5 show that the surface of Ni/PSi samples is more thickly oxidized with increasing C n .…”

Section: Photoluminescence Properties Of Ni/psi Powdersmentioning

confidence: 91%

Properties of magnetic nickel/porous-silicon composite powders

Nakamura

Adachi

2012

AIP Advances

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The magnetic and photoluminescence (PL) properties of nickel/porous-silicon (Ni/PSi) composite powders are investigated. Ni/PSi composite powders are prepared by stain etching of Si powder in a HF/HNO3 solution followed by electroless plating of Ni nanoparticles on the stain-etched PSi powder in a NiCl2 solution. The Ni/PSi powders exhibit hydrophillicity, superparamagnetism caused by the deposited Ni nanoparticles, and orange-red PL owing to the nanostructured PSi surface. The degree of magnetization decreases with increasing Ni plating time, indicating its dependence on the size of the Ni nanoparticles. The Ni/PSi composite powders also show a stronger magnetization as compared to that of the Ni-particle-plated Si powder. The stronger magnetization results from the larger surface area of PSi. The PL intensity, peak wavelength, and lifetime of Ni/PSi are strongly dependent on the NiCl2 concentration. This dependence is due to the different thickness of the oxide overlayer on the PSi surface formed during the Ni plating process. The existence of the oxide overlayer also results in a small change in the PL intensity against excitation time

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Section: Photoluminescence Properties Of Ni/psi Powdersmentioning

confidence: 91%

Properties of magnetic nickel/porous-silicon composite powders

Nakamura

Adachi

2012

AIP Advances

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“…Etching time was 30 min. After etching, the prepared PSi powder was collected by filtering the etching solution and dried under ambient condition for 24 h. The PSi powder exhibited hydrophobicity due to the hydrogen termination although its surface is partially oxidized [49] as similar to PSi sample prepared by electrochemical etching. [50] For obtaining colloidal Si-nc samples, 100 mg of PSi powder was dispersed in an organic solvent with a volume of 3 mL in a quartz cuvette.…”

Section: Methodsmentioning

confidence: 99%

Facile Formation of Stable Water‐Dispersed Luminescent Silicon Nanocrystals by Laser Processing in Liquid: Toward Fluorescent Labeling for Bio‐Imaging

Nakamura

Chinnathambi

et al. 2019

ChemNanoMat

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We herein develop a facile formation process of a water‐dispersed red luminescent undecenoic acid‐functionalized silicon nanocrystal (UA‐F: Si‐nc) via pulsed laser irradiation of porous silicon (PSi) in an organic solvent. The formed UA‐F: Si‐nc has a high stability against pH changes in aqueous solution and photo‐irradiation in water without any multi‐step surface treatments. Such a robust aqueous surface protection of Si‐nc is caused by hydrophilic organic group terminations and subsequent surface protection of OH bonding. From the viability and in vitro bio‐imaging tests against Hela cells and A549 cells, we confirmed that UA‐F: Si‐nc has very low cytotoxicity due to the essential biocompatibility of silicon and remains exhibiting a bright red luminescence in the cells. Because of its high stability in water as well as biocompatibility, UA‐F: Si‐nc is expected to act as a fluorescent label of cellular imaging.

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“…For the red PL from anodized bare Si, the mechanism involves the oxygen defects that are in the QC (arising from the Si nanoparticles). 20 In the case of nanoisland SiO x /Cu x O composite, the red PL still arose from the oxygen defects under QC effect. XPS spectrum ( Figure 2b) and HR-TEM (Fig.…”

Section: Photoluminescence Properties Of Nanoisland-structured Sio X mentioning

confidence: 99%

Synthesis and fluorescence properties of a nanoisland-structured SiO_x/Cu_xO composite

Ishida

Nguyen

et al. 2015

J. Mater. Chem. C

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Electronic Supplementary Information (ESI) available: narrow X-ray photoelectron spectra of F 1s, TEM image of the cracks, SEM images of anodized SiCu with various Cu deposition condition and EDS quantitative analysis of different regions of the prepared nano-island Si/CuxO composite. See A nanoisland-structured SiOx (x ≤ 2)/CuxO (x ≤ 2) composite was prepared from a Cu-deposited Si wafer by electrochemical anodization in a hydrofluoric acid (HF)-and-ferric nitrate (Fe(NO3)3) electrolyte. The surface of the nanoisland comprised Cu, Cu oxides, Si nanoparticles and Si oxides. The distribution of elemental Cu on the surface was uniform. Cracks and native Cu-oxides in the deposited Cu layer are the two main factors for the formation of the nanoisland-structured surface. Different from the single red photoluminescence (PL) band emitted from the electrochemical anodized bare Si wafer, a dual-visible PL band with comparable intensities at red and blue ranges was observed. The red PL quenching did not happen in this Cu-ions -doped nanostructured Si due to the different distribution areas of Cu + and the red PL centre.The red PL originates due to oxygen defects in the band gap of Si nanoparticles/Si oxides; the blue PL is the consequence of the band-to-band transitions between 3d 10 and 3d 9 4s 1 of Cu + ions and the intra d → d band transition of Cu 2+ ions in the interstitial vacancies of Si oxides. Compared with the electrochemical anodized bare Si sample with a single PL band, the nanoisland-structured SiOx/CuxO composite emitting a dual-PL-band is more promising for fabricating white light emitters. (8 cm × 3.37 cm)A dual-visible-band photoluminescence from SiO x /Cu x O composite was observed. The common red PL quenching phenomenon did not happen.

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Effects of thermal oxidation on the photoluminescence properties of porous silicon

Cited by 25 publications

References 29 publications

Properties of magnetic nickel/porous-silicon composite powders

Properties of magnetic nickel/porous-silicon composite powders

Facile Formation of Stable Water‐Dispersed Luminescent Silicon Nanocrystals by Laser Processing in Liquid: Toward Fluorescent Labeling for Bio‐Imaging

Synthesis and fluorescence properties of a nanoisland-structured SiO_x/Cu_xO composite

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Effects of thermal oxidation on the photoluminescence properties of porous silicon

Cited by 25 publications

References 29 publications

Properties of magnetic nickel/porous-silicon composite powders

Properties of magnetic nickel/porous-silicon composite powders

Facile Formation of Stable Water‐Dispersed Luminescent Silicon Nanocrystals by Laser Processing in Liquid: Toward Fluorescent Labeling for Bio‐Imaging

Synthesis and fluorescence properties of a nanoisland-structured SiOx/CuxO composite

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Synthesis and fluorescence properties of a nanoisland-structured SiO_x/Cu_xO composite