Fabrication of Macroporous Silicon in Organic Electrolytes and their Luminescence

2017 ◽  
Vol 748 ◽  
pp. 127-131 ◽  
Author(s):  
Wu Lin Li ◽  
Wen Jing Yang ◽  
Mei Long ◽  
Gen Rong Li ◽  
Yan Ma ◽  
...  
Keyword(s):  
Porous Silicon ◽  
Room Temperature ◽  
Electrochemical Process ◽  
Macroporous Silicon ◽  
Organic Solution ◽  
Organic Electrolytes ◽  
Red Luminescence ◽  
Organic Solutions ◽  
Side Illumination ◽  
Nanoporous Layer

The quasi-regular arrangements porous silicon was fabricated by by electrochemical process using organic solutions with front-side illumination, and SEM showed that the morphology of porous silicon was dependent sensitively on the current density, organic electrolytes and their concentration. The results indicate that N-dimethylformamide (DMF) is the best organic solution and quasi-regular arranged pores can be well organized in 20%HF/DMF solution. The luminescence shows fresh porous silicon can emit the red luminescence at room temperature and quench after nanoporous layer destroyed.

Carrier Dynamics in Porous Silicon: from the Femtosecond to the Second

1994 ◽  
Vol 358 ◽  
Author(s):  
Philippe M. Fauchet
Keyword(s):  
Porous Silicon ◽  
Time Domain ◽  
Room Temperature ◽  
Auger Recombination ◽  
Excitation Intensity ◽  
Carrier Dynamics ◽  
Time Resolved ◽  
Oxidized Porous Silicon ◽  
Red Luminescence ◽  
Absorption Measurements

ABSTRACTThe luminescence in red-emitting porous silicon exhibits a distribution of lifetimes in the μsec time domain at room temperature and in the msec time domain at cryogenic temperatures. However, the luminescence and carrier dynamics in porous silicon display transients that vary from much less than 1 psec to ∼ 1 sec, depending on the measurement conditions and sample preparation. We have investigated the carrier dynamics in porous silicon by two time-resolved techniques. The blue photoluminescence of oxidized porous silicon has been measured with 100 ps time resolution as a function of the oxidation method, emission wavelength, excitation intensity and measurement temperature. The blue luminescence has a distinct origin from the well-studied red luminescence and we attribute it to defects in the oxide. Femtosecond photoinduced absorption measurements have been performed on thin red-emitting porous silicon films. The wavelength and intensity dependence of the recovery are interpreted in terms of trapping and of Auger recombination at high excitation intensity. Our results also show conclusively that red-emitting porous silicon is not a direct gap semiconductor.

Imidazole Promoted Efficient Anomerization of β-D-Glucose Pentaacetate in Organic Solutions and Solid State

2019 ◽  
Author(s):  
Meifeng Wang ◽  
Liyin Zhang ◽  
Yiqun Li ◽  
Liuqun Gu
Keyword(s):  
Solid State ◽  
Organic Solvents ◽  
Room Temperature ◽  
Materials Design ◽  
The Future ◽  
Organic Solutions ◽  
Glucose Pentaacetate

<p></p>Anomerization of glycosides were rarely performed under basic condition due to lack of efficiency. Here an imidazole promoted anomerization of β-D-glucose pentaacetate was developed; and reaction could proceed in both organic solvents and solid state at room temperature. Although mechanism is not yet clear, this unprecedent mild anomerization in solid state may open a new promising way for stereoseletive anomerization of broad glucosides and materials design in the future..

scholarly journals Electrodeposition of neodymium and dysprosium from organic electrolytes

2021 ◽  
Vol 23 (15) ◽  
pp. 9070-9079
Author(s):  
Pieter Geysens ◽  
Pin-Cheng Lin ◽  
Jan Fransaer ◽  
Koen Binnemans
Keyword(s):  
Room Temperature ◽  
Organic Electrolytes ◽  
Redox Active

Nd3+ or Dy3+ salts and borohydride form redox-active [Ln(BH4)4]− complexes that enable room-temperature electrodeposition of neodymium- or dysprosium-containing layers from organic electrolytes.

Room-temperature electroluminescence from erbium-doped porous silicon

1999 ◽  
Vol 75 (25) ◽  
pp. 3989-3991 ◽  
Author(s):  
Herman A. Lopez ◽  
Philippe M. Fauchet
Keyword(s):  
Porous Silicon ◽  
Room Temperature ◽  
Erbium Doped

scholarly journals Towards Chloride-Free Organic Electrolytes for Rechargeable Aluminum Batteries

2021 ◽  
Author(s):  
Zaher Slim ◽  
Erik Menke
Keyword(s):  
Room Temperature ◽  
Practical Realization ◽  
Organic Electrolytes ◽  
Al Speciation ◽  
Electrochemically Deposited ◽  
Major Shortcoming ◽  
Experimental Approaches ◽  
High Consistency ◽  
Free Environment ◽  
Complex Ion

The corrosivity of chloride-based electrolytes is a major shortcoming in the practical realization of rechargeable aluminum batteries. Herein, the effect of Cl- on Al speciation and electrochemistry in tetrahydrofuran was measured by employing theoretical and experimental approaches for three systems: Al(OTF)3/THF, Al(OTF)3 plus LiCl in THF, and AlCl3/THF. The high consistency between measured and computed spectroscopic aspects associated with Al(OTF)3/THF electrolyte provided both a rationale for understanding Al complex-ion formation in a Cl- free environment and an approach for examining the effect of Cl- on Al speciation. Room-temperature Al plating was achieved from dilute solutions ([Al] = 0.1M) at potentials ≥ 0V (vs. Al⁄Al3+). Cl- is found to enable facile Al plating and SEM reveals that Al is electrochemically deposited as nanocrystalline grains.

scholarly journals POTENSI BEBERAPA LARUTAN ORGANIK DALAM MENDUKUNG PRODUKSI BAWANG MERAH (Allium ascalonicum)

AGRIFOR ◽  
2021 ◽  
Vol 20 (2) ◽  
pp. 207
Author(s):  
Milawati Lalla ◽  
Suwandi Said
Keyword(s):  
Dry Weight ◽  
Fresh Weight ◽  
Organic Solution ◽  
Potential Production ◽  
Plot Size ◽  
Grass Root ◽  
Organic Solutions

Red unions are one type of plant that is widely used as a  spice ini cooking and cannot be replaced with other types of plants so it is needed every time.   The research objective was to obtain one type of organic solution that produced the highest production of shallots and to calculate the potential production of each given organic  solution.  The research was carried out at the Kebun Percontohan Balai Penyuluhan Pertanian Bulango Timur in January-April 2020.  The research was conducted in the form of Randomized Bloc design consisting of 8 treatments including control namely without the use of organic solutions, POC, MOL Rice, MOL Banana, ZPT red union, ZPT Tauge, PGPR Root Bamboo and PGPR Elephan Grass Root.  Repeat 3 times with a plot size 1 m x 1 m.  The parameters observed were fresh weight and dry weight of red union bulbs.  The results showed that the highest fresh weight was obtained from the treatment of ZPT red union  14,22 ton haˉ¹) and MOL banana (14,06 ton haˉ¹).  The highest dry weight of bulbs resulted from the MOL treatment of banana (9,93 ton haˉ¹) and ZPT red union (9,87 ton haˉ¹).

Depositing Metals into Porous Silicon - the Impact on Luminescence

1994 ◽  
Vol 358 ◽  
Author(s):  
P. Steiner ◽  
F. Kozlowski ◽  
W. Lang
Keyword(s):  
Porous Silicon ◽  
Porous Layer ◽  
Electron Microprobe ◽  
Uv Light ◽  
Electrochemical Process ◽  
Photoluminescence Intensity ◽  
Spectral Position ◽  
Metal Atoms ◽  
Metal Treatment ◽  
The Impact

ABSTRACTIndium, tin, antimony and aluminum are deposited by an electrochemical process into the pores of n-type porous silicon which is anodized with ultraviolet light applied during formation. The presence of these metal atoms in the porous layer is checked by electron microprobe measurement. As reported previously, UV-light etched material shows red photoluminescence (630 nm) and blue electroluminescence (470 nm) without the metal treatment. After metal deposition the photoluminescence intensity decreases slightly (factor 0.5 - 0.8), whereas the spectral position remains constant. The electroluminescence efficiency is significantly enhanced by indium, aluminum and tin in the pores (factor 5 - 90). The tin and antimony treatment causes a red shift to 580 nm and 740 nm, respectively. The conductivity is slightly increased by all kinds of metals by a factor 2-5.

Room‐temperature backbond oxidation of the porous silicon surface by oxygen radical irradiation

1995 ◽  
Vol 66 (7) ◽  
pp. 836-838 ◽  
Author(s):  
Patrick O’Keeffe ◽  
Yoshinobu Aoyagi ◽  
Shuji Komuro ◽  
Takashi Kato ◽  
Takitaro Morikawa
Keyword(s):  
Porous Silicon ◽  
Silicon Surface ◽  
Room Temperature ◽  
Oxygen Radical ◽  
Porous Silicon Surface

Effect of current density on the porous silicon preparation as gas sensors**

2021 ◽  
Vol 30 (1) ◽  
pp. 257-264
Author(s):  
Muna H. Kareem ◽  
Adi M. Abdul Hussein ◽  
Haitham Talib Hussein
Keyword(s):  
Porous Silicon ◽  
Gas Sensors ◽  
Current Density ◽  
Room Temperature ◽  
Low Cost ◽  
High Surface ◽  
Volume Ratio ◽  
Etching Time ◽  
Force Microscopy ◽  
Materials Used

Abstract In this study, porous silicon (PSi) was used to manufacture gas sensors for acetone and ethanol. Samples of PSi were successfully prepared by photoelectrochemical etching and applied as an acetone and ethanol gas sensor at room temperature at various current densities J= 12, 24 and 30 mA/cm2 with an etching time of 10 min and hydrofluoric acid concentration of 40%. Well-ordered n-type PSi (100) was carefully studied for its chemical composition, surface structure and bond configuration of the surface via X-ray diffraction, atomic force microscopy, Fourier transform infrared spectroscopy and photoluminescence tests. Results showed that the best sensitivity of PSi was to acetone gas than to ethanol under the same conditions at an etching current density of 30 mA/cm2, reaching about 2.413 at a concentration of 500 parts per million. The PSi layers served as low-cost and high-quality acetone gas sensors. Thus, PSi can be used to replace expensive materials used in gas sensors that function at low temperatures, including room temperature. The material has an exceptionally high surface-to-volume ratio (increasing surface area) and demonstrates ease of fabrication and compatibility with manufacturing processes of silicon microelectronics.

Observation of room-temperature resonant photoluminescence in porous silicon

2006 ◽  
Vol 35 (1) ◽  
pp. 151-156 ◽  
Author(s):  
A Kanjilal ◽  
M Song ◽  
K Furuya ◽  
B Mallik
Keyword(s):  
Porous Silicon ◽  
Room Temperature
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