scholarly journals Localized electron state on porous silicon quantum dots

2009 ◽  
Vol 58 (7) ◽  
pp. 4652
Author(s):  
Huang Wei-Qi ◽  
Wang Xiao-Yun ◽  
Zhang Rong-Tao ◽  
Yu Shi-Qiang ◽  
Qin Chao-Jian
Keyword(s):  
Quantum Dots ◽  
Porous Silicon ◽  
Electron State ◽  
Silicon Quantum Dots

scholarly journals Electronic States and Luminescence in Porous Silicon Quantum Dots: The Role of Oxygen

1999 ◽  
Vol 82 (1) ◽  
pp. 197-200 ◽  
Author(s):  
M. V. Wolkin ◽  
J. Jorne ◽  
P. M. Fauchet ◽  
G. Allan ◽  
C. Delerue
Keyword(s):  
Quantum Dots ◽  
Porous Silicon ◽  
Electronic States ◽  
Silicon Quantum Dots

Symmetry-forbidden Raman scattering from porous silicon quantum dots

2002 ◽  
Vol 65 (3) ◽  
Author(s):  
Md. N. Islam ◽  
R. N. Panda ◽  
A. Pradhan ◽  
Satyendra Kumar
Keyword(s):  
Quantum Dots ◽  
Porous Silicon ◽  
Raman Scattering ◽  
Silicon Quantum Dots

Broadband visible emission from photoelectrochemical etched porous silicon quantum dots containing zinc

2021 ◽  
Vol 258 ◽  
pp. 123935
Author(s):  
Mohammad S. Almomani ◽  
Naser M. Ahmed ◽  
Marzaini Rashid ◽  
M.A. Almessiere ◽  
Abeer S. Altowyan
Keyword(s):  
Quantum Dots ◽  
Porous Silicon ◽  
Visible Emission ◽  
Silicon Quantum Dots

The effects of drying technique and surface pre-treatment on the cytotoxicity and dissolution rate of luminescent porous silicon quantum dots in model fluids and living cells

2020 ◽  
Vol 222 ◽  
pp. 318-331 ◽  
Author(s):  
Maxim B. Gongalsky ◽  
Uliana A. Tsurikova ◽  
Catherine J. Storey ◽  
Yana V. Evstratova ◽  
Andrew A. Kudryavtsev ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Porous Silicon ◽  
Dissolution Rate ◽  
Living Cells ◽  
Silicon Quantum Dots ◽  
Pre Treatment ◽  
Model Fluids

Tailoring of the cytotoxicity and dissolution rate of luminescent porous silicon quantum dots is presented.

scholarly journals High-yield green fabrication of colloidal silicon quantum dots by low-temperature thermal cracking of porous silicon

APL Materials ◽  
2020 ◽  
Vol 8 (8) ◽  
pp. 081105
Author(s):  
Toshihiro Nakamura ◽  
Nobuyoshi Koshida ◽  
Ze Yuan ◽  
Jun Otsubo
Keyword(s):  
Quantum Dots ◽  
Porous Silicon ◽  
Low Temperature ◽  
Thermal Cracking ◽  
High Yield ◽  
Silicon Quantum Dots

(Invited) Facile Formation of Luminescent Colloidal Silicon Quantum Dots from Porous Silicon

2021 ◽  
Vol MA2021-01 (23) ◽  
pp. 906-906
Author(s):  
Toshihiro Nakamura ◽  
Nobuyoshi Koshida
Keyword(s):  
Quantum Dots ◽  
Porous Silicon ◽  
Silicon Quantum Dots

scholarly journals Endocytosis and Lack of Cytotoxicity of Alkyl-Capped Silicon Quantum Dots Prepared from Porous Silicon

Materials ◽  
2019 ◽  
Vol 12 (10) ◽  
pp. 1702 ◽  
Author(s):  
Wipaporn Phatvej ◽  
Harish K. Datta ◽  
Simon C. Wilkinson ◽  
Elaine Mutch ◽  
Ann K. Daly ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Porous Silicon ◽  
Cell Line ◽  
Cell Lines ◽  
Particle Diameter ◽  
Terminal Deoxynucleotidyl Transferase ◽  
Small Intestinal Mucosa ◽  
High Porosity ◽  
Silicon Quantum Dots ◽  
Atp Production

Freely-dissolved silicon quantum dots were prepared by thermal hydrosilation of 1-undecene at high-porosity porous silicon under reflux in toluene. This reaction produces a suspension of alkyl-capped silicon quantum dots (alkyl SiQDs) with bright orange luminescence, a core Si nanocrystal diameter of about 2.5 nm and a total particle diameter of about 5 nm. Previous work has shown that these particles are rapidly endocytosed by malignant cell lines and have little or no acute toxicity as judged by the standard 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay for viability and the Terminal deoxynucleotidyl transferase dUTP nick end labeling (TUNEL) assay for apoptosis. We have extended this work to the CACO-2 cell line, an established model for the human small intestinal mucosa, and demonstrate that neither acute nor chronic (14 days) toxicity is observed as judged by cell morphology, viability, ATP production, ROS production and DNA damage (single cell gel electrophoresis) at doses of 50–200 μ g mL − 1 . Quantitative assessment of the extent of uptake of alkyl SiQDs by CACO-2, HeLa, HepG2, and Huh7 cell lines by flow cytometry showed a wide variation. The liver cell lines (HepG2 and Huh7) were the most active and HeLa and CACO-2 showed comparable activity. Previous work has reported a cholesterol-sensitivity of the endocytosis (HeLa), which suggests a caveolin-mediated pathway. However, gene expression analysis by quantitative real–time polymerase chain reaction (RT-PCR) indicates very low levels of caveolins 1 and 2 in HepG2 and much higher levels in HeLa. The data suggest that the mechanism of endocytosis of the alkyl SiQDs is cell-line dependent.

Oxidation-Induced Redshifts in the Energy Gap of Silicon Quantum Dots

2013 ◽  
Vol 562-565 ◽  
pp. 852-857 ◽  
Author(s):  
Jie Qiong Zeng ◽  
Hong Yu
Keyword(s):  
Quantum Dots ◽  
Porous Silicon ◽  
Software Package ◽  
Energy Gap ◽  
Slight Reduction ◽  
First Principle ◽  
Hydrogen Atoms ◽  
Silicon Quantum Dots ◽  
First Principle Calculations ◽  
Oxidized Porous Silicon

To investigate the effects of Si/O bond at the surface of silicon quantum dots (Si QDs) on the electronic properties of Si QDs, first principle calculations have been performed for Si QDs consisting of 10-87 Si atoms (0.6-1.5 nm in diameter) by using the CASTEP software package. In these calculations the Si dangling bonds on the surface of Si QDs are passivated by hydrogen atoms and oxygen. Four different oxygen configurations have been studied, they are double-bonded, backbonded, bridge-bonded and inserted, respectively. We find that a significant reduction of energy gap is caused by the presence of double-bonded oxygen, whereas for other three oxygen configurations there is just a slight reduction on energy gap. As a result, the model which contains Si=O bond is considered the most appropriate to explain the photoluminescence redshifts in oxidized porous silicon.

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