RECONSTITUTION OF A PROTEIN MONOLAYER ON THIOLATES FUNCTIONALIZED GaAs SURFACE

2012 ◽  
Vol 11 (04) ◽  
pp. 1240018 ◽  
Author(s):  
A. BIENAIME ◽  
T. LEBLOIS ◽  
G. LUCCHI ◽  
V. BLONDEAU-PATISSIER ◽  
P. DUCOROY ◽  
...  
Keyword(s):  
Gaas Substrate ◽  
Electronic Circuit ◽  
Gaas Surface ◽  
Self Assembled Monolayer ◽  
Layer Deposition ◽  
Crystalline Surface ◽  
Modified Surface ◽  
Self Assembled ◽  
Protein Monolayer

In the aim to realize an efficient resonant biosensor, gallium arsenide (GaAs) presents many advantages. In addition to its properties of transduction, GaAs is a crystal for which microfabrication processes were developed, conferring the possibility to miniaturize the device and integrate electronic circuit. Moreover, the biofunctionalization could be realized on the crystalline surface without layer deposition, constituting a real advantage to perform reusable sensor. The functionalization of GaAs surface was engaged in order to immobilize a protein monolayer on this substrate. Functionalization was done using a mixed self assembled monolayer of thiolate molecules. Characterizations at micro and nanoscale were performed to control the surface state, the establishment of thiolates self-assembled monolayer, the surface atomic composition and the topography of the GaAs substrate at the different steps of the process. Protein immobilization on thiolates modified GaAs was revealed through a detailed AFM study and in situ MALDI-TOF MS and MS/MS modified surface interrogations.

Spectral and cyclic voltammetric characterization of self-assembled monolayers on gold of pyrene end-labeled oligonucleotide duplexes

1999 ◽  
Vol 77 (5-6) ◽  
pp. 1077-1084 ◽  
Author(s):  
R Scott Reese ◽  
Marye Anne Fox
Keyword(s):  
Gold Surface ◽  
Self Assembled Monolayers ◽  
Self Assembled Monolayer ◽  
Surface Emission ◽  
Assembled Monolayers ◽  
Oligonucleotide Duplex ◽  
Self Assembled ◽  
Duplex Formation

Self-assembled monolayers of sulfur-terminated oligonucleotide duplexes were formed on flat gold surfaces, either by exposure of a self-assembled monolayer bearing one oligonucleotide strand to the complementary strand or by preformation of a oligonucleotide duplex that was then deposited on a fresh gold surface. Virtually identical spectral behavior was observed whether the duplex was produced before deposition or by in situ complementary association. With a duplex bearing an appropriate pyrene end-label, the resulting thin film was photoresponsive. Surface emission measurements show no evidence for pyrene aggregation on the modified surfaces. The polarity of the photocurrent, reflecting photoinduced electron transfer initiated by photoexcitation of pyrene, is opposite that expected from the oligonucleotide-mediated reduction of the appended pyrene excited state.Key words: oligonucleotide, self-assembled monolayer, duplex formation, photoelectrochemistry, surface emission.

Atomic layer deposition of HfO2 on self-assembled monolayer-passivated Ge surfaces

2010 ◽  
Vol 518 (15) ◽  
pp. 4126-4130 ◽  
Author(s):  
Kibyung Park ◽  
Younghwan Lee ◽  
Kyung Taek Im ◽  
June Young Lee ◽  
Sangwoo Lim
Keyword(s):  
Atomic Layer Deposition ◽  
Atomic Layer ◽  
Self Assembled Monolayer ◽  
Layer Deposition ◽  
Self Assembled

scholarly journals High surface coverage of a self-assembled monolayer by in situ synthesis of palladium nanodeposits

Nanoscale ◽  
2017 ◽  
Vol 9 (35) ◽  
pp. 13281-13290 ◽  
Author(s):  
Lucía Herrer ◽  
Victor Sebastian ◽  
Santiago Martín ◽  
Alejandro González-Orive ◽  
Francesc Pérez-Murano ◽  
...  
Keyword(s):  
Surface Coverage ◽  
High Surface ◽  
In Situ Synthesis ◽  
Self Assembled Monolayer ◽  
Confined Growth ◽  
Growth Method ◽  
Self Assembled

Nascent metal|monolayer|metal devices have been fabricated by depositing palladium, by growing palladium nanodeposits through a CO-confined growth method.

Effect of Chemisorptions on Wetting Property in TiO Nanosheet Film

2012 ◽  
Vol 601 ◽  
pp. 16-20
Author(s):  
Yin Ping Ye ◽  
Wen Du ◽  
Hong Xuan Li ◽  
Li Ji ◽  
Jian Min Chen ◽  
...  
Keyword(s):  
Magnetron Sputtering ◽  
Hydrothermal Method ◽  
Xps Analysis ◽  
Self Assembled Monolayer ◽  
Wetting Property ◽  
Self Assembled

TiO nanosheet films were fabricated by magnetron sputtering and followed with the direct in situ hydrothermal method. Without UV irriadiation, the TiO nanosheet surface showed a wetting property of superhydrophilicity. However, after chemisorptions using a self-assembled monolayer of n-CF3(CF2)7CH2CH2Si(OC2H5)3, the wetting property of the film can be changed from superhydrophilicity to superhydrophobicity. Based on the FESEM, XRD, XPS analysis, the mechanism of the wetting bahavior was proposed.

scholarly journals Corrosion inhibition of iron surfaces with phosphatidic acid

2019 ◽  
Vol 3 (3) ◽  
pp. 128-134 ◽  
Author(s):  
Ahmed Sameer Al-Badran ◽  
Adam Mechler
Keyword(s):  
Phosphatidic Acid ◽  
Acetic Acid Solution ◽  
Protective Layer ◽  
Self Assembled Monolayer ◽  
Animal Fat ◽  
Surface Areas ◽  
Assembled Monolayers ◽  
Self Assembled ◽  
Prevention Method

Abstract Preventing the corrosion of iron in inaccessible structures requires a coating method that reaches all surface areas and creates a uniform protective layer. An ages old practice to protect iron artefacts is to coat them with animal fat, that is, a mixture of lipids. This “method” is accidentally ingenious: some natural phospholipids found in animal fat have the potential to form a tightly packed self-assembled monolayer on metal oxide surfaces, similar to the surfactant monolayers that have attracted increasing attention lately. Thus, the most primitive corrosion prevention method may point at a way to coat complex iron structures in an industrial environment. Here the ability of phosphatidic acid, a natural lipid, to coat and protect iron surfaces was examined. Iron coated quartz crystal microbalance (QCM) sensors were used for the experiments, to monitor the deposition of the lipid as well as the acidic corrosion (dissolution) of iron in situ, in real time. The sensors were coated by self-assembled monolayers of di-myristoyl phosphatidic acid using the liposome deposition method. In this process, 50-100 nm vesicles formed by the lipid are delivered in an aqueous solution and spontaneously coat the iron surfaces upon contact. QCM and ellipsometry measurements confirmed that continuous bilayer and monolayer surface coatings can be achieved by this method. QCM measurements also confirmed that the layers were corrosion resistant in 0.01M acetic acid solution that would dissolve the thin iron layer in minutes in the absence of the protective coating. XPS results suggested a chemisorption-based mechanism of phosphatidic acid attachment to the iron surface. Hence, liposome deposition of phosphatidic acid offers a suitable solution to coat iron surfaces in inaccessible structures in situ.

Characterizing Self-Assembled Monolayer Breakdown in Area-Selective Atomic Layer Deposition

Langmuir ◽  
2021 ◽  
Vol 37 (39) ◽  
pp. 11637-11645
Author(s):  
Tzu-Ling Liu ◽  
Li Zeng ◽  
Katie L. Nardi ◽  
Dennis M. Hausmann ◽  
Stacey F. Bent
Keyword(s):  
Atomic Layer Deposition ◽  
Atomic Layer ◽  
Self Assembled Monolayer ◽  
Layer Deposition ◽  
Self Assembled
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