Organized porous alumina membranes for high density silicon nanowires growth

2011 ◽  
Vol 88 (9) ◽  
pp. 2844-2847 ◽  
Author(s):  
T. Bernardin ◽  
L. Dupré ◽  
L. Burnier ◽  
P. Gentile ◽  
D. Peyrade ◽  
...  
Keyword(s):  
Silicon Nanowires ◽  
Porous Alumina ◽  
High Density ◽  
Alumina Membranes ◽  
Nanowires Growth

scholarly journals Optimization of High-Density Fe-Au Nano-Arrays for Surface-Enhanced Raman Spectroscopy of Biological Samples

Biosensors ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 181
Author(s):  
Giovanni Marinaro ◽  
Maria Laura Coluccio ◽  
Francesco Gentile
Keyword(s):  
Raman Spectroscopy ◽  
Porous Alumina ◽  
Thiol Group ◽  
Surface Enhanced Raman Spectroscopy ◽  
High Density ◽  
Raman Signal ◽  
Gold Nanowires ◽  
Alumina Membranes ◽  
Surface Enhanced ◽  
Surface Enhanced Raman

The method of realizing nanostructures using porous alumina templates has attracted interest due to the precise geometry and cheap cost of nanofabrication. In this work, nanoporous alumina membranes were utilized to realize a forest of nanowires, providing a bottom-up nanofabrication method suitable for surface-enhanced Raman spectroscopy (SERS). Gold and iron were electroplated through the straight channels of the membrane. The resulting nanowires are, indeed, made of an active element for plasmonic resonance and SERS as the hexagonal distribution of the nanowires and the extreme high density of the nanowires allows to excite the plasmon and detect the Raman signal. The method to reduce the distance between pores and, consequently, the distance of the nanowires after electrodeposition is optimized here. Indeed, it has been predicted that the light intensity enhancement factor is up to 1012 when the gap is small than 10 nm. Measurements of Raman signal of thiol groups drying on the gold nanowires show that the performance of the device is improved. As the thiol group can be linked to proteins, the device has the potential of a biosensor for the detection of a few biomolecules. To assess the performance of the device and demonstrate its ability to analyze biological solutions, we used it as SERS substrates to examine solutions of IgG in low abundance ranges. The results of the test indicate that the sensor can convincingly detect biomolecules in physiologically relevant ranges.

Structural and chemical modification of porous alumina membranes

2009 ◽  
Vol 126 (1-2) ◽  
pp. 87-94 ◽  
Author(s):  
Leonora Velleman ◽  
Gerry Triani ◽  
Peter J. Evans ◽  
Joe G. Shapter ◽  
Dusan Losic
Keyword(s):  
Chemical Modification ◽  
Porous Alumina ◽  
Alumina Membranes

scholarly journals Separating Hydrogen From Coal Gasification Gases With Alumina Membranes

1991 ◽  
Author(s):  
B. Z. Egan ◽  
D. E. Fain ◽  
G. E. Roettger ◽  
D. E. White
Keyword(s):  
Carbon Dioxide ◽  
Coal Gasification ◽  
Process Development ◽  
Porous Alumina ◽  
Mean Value ◽  
Knudsen Flow ◽  
Gasification Process ◽  
Alumina Membranes ◽  
Separation Factors ◽  
Membrane Permeabilities

Synthesis gas produced in coal gasification processes contains hydrogen, along with carbon monoxide, carbon dioxide, hydrogen sulfide, water, nitrogen, and other gases, depending on the particular gasification process. Development of membrane technology to separate the hydrogen from the raw gas at the high operating temperatures and pressures near exit gas conditions would improve the efficiency of the process. Tubular porous alumina membranes with mean pore radii ranging from about 9 to 22 A have been fabricated and characterized. Based on the results of hydrostatic tests, the burst strength of the membranes ranged from 800 to 1600 psig, with a mean value of about 1300 psig. These membranes were evaluated for separating hydrogen and other gases. Tests of membrane permeabilities were made with helium, nitrogen, and carbon dioxide. Measurements were made at room temperature in the pressure range of 15 to 589 psi. In general, the relative gas permeabilities correlated qualitatively with a Knudsen flow mechanism; however, other gas transport mechanisms such as surface adsorption may also be involved. Efforts are under way to fabricate membranes having still smaller pores. At smaller pore sizes, higher separation factors are expected from molecular sieving effects.

scholarly journals Porous alumina membranes with branched nanopores as templates for fabrication of Y-shaped nanowire arrays

2012 ◽  
Vol 16 (11) ◽  
pp. 3611-3619 ◽  
Author(s):  
Leszek Zaraska ◽  
Elżbieta Kurowska ◽  
Grzegorz D. Sulka ◽  
Marian Jaskuła
Keyword(s):  
Porous Alumina ◽  
Nanowire Arrays ◽  
Alumina Membranes

Growth and characterization of high density stoichiometric SiO2dot arrays on Si through an anodic porous alumina template

2006 ◽  
Vol 17 (9) ◽  
pp. 2146-2151 ◽  
Author(s):  
M Kokonou ◽  
A G Nassiopoulou ◽  
K P Giannakopoulos ◽  
A Travlos ◽  
T Stoica ◽  
...  
Keyword(s):  
Porous Alumina ◽  
High Density ◽  
Alumina Template ◽  
Porous Alumina Template ◽  
Anodic Porous Alumina ◽  
Anodic Porous Alumina Template
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