Synthesis, self-assembly and characterization of a novel push–pull thiophene-based chromophore on a gold surface

RSC Advances ◽  
2015 ◽  
Vol 5 (33) ◽  
pp. 26308-26315 ◽  
Author(s):  
Volodymyr Malytskyi ◽  
Jean-Jacques Simon ◽  
Lionel Patrone ◽  
Jean-Manuel Raimundo
Keyword(s):  
Self Assembly ◽  
Gold Surface ◽  
Film Properties ◽  
Self Assembled

A self-assembled dense monolayer based on a non-charged push–pull chromophore is clearly evidenced by electrochemical, XPS and STM analysis. Associated with good film properties a conducting behavior consistent with the structure of the SAM-organized push–pull is also shown.

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.

Self-Assembled Hexasaccharides:  Surface Characterization of Thiol-Terminated Sugars Adsorbed on a Gold Surface

Langmuir ◽  
1996 ◽  
Vol 12 (25) ◽  
pp. 6074-6082 ◽  
Author(s):  
Michaela C. Fritz ◽  
Georg Hähner ◽  
Nicholas D. Spencer ◽  
Roland Bürli ◽  
Andrea Vasella
Keyword(s):  
Surface Characterization ◽  
Gold Surface ◽  
Self Assembled

Self-Assembly of Proteins into Three-Dimensional Structures Using Bio-Conjugation

2014 ◽  
Vol 1663 ◽  
Author(s):  
Garima Thakur ◽  
Kovur Prashanthi ◽  
Thomas Thundat
Keyword(s):  
Self Assembly ◽  
Three Dimensional ◽  
Gold Surface ◽  
Building Blocks ◽  
Growth Conditions ◽  
Base Layer ◽  
Chemical Structures ◽  
Molecular Building Blocks ◽  
Ring Structures ◽  
Self Assembled

ABSTRACTSelf–assembly of molecular building blocks provides an interesting route to produce well-defined chemical structures. Tailoring the functionalities on the building blocks and controlling the time of self-assembly could control the properties as well as the structure of the resultant patterns. Spontaneous self-assembly of biomolecules can generate bio-interfaces for myriad of potential applications. Here we report self-assembled patterning of human serum albumin (HSA) protein in to ring structures on a polyethylene glycol (PEG) modified gold surface. The structure of the self-assembled protein molecules and kinetics of structure formation entirely revolved around controlling the nucleation of the base layer. The formation of different sizes of ring patterns is attributed to growth conditions of the PEG islands for bio-conjugation. These assemblies might be beneficial in forming structurally ordered architectures of active proteins such as HSA or other globular proteins.

THE ELECTROCHEMICAL STUDIES ON A SELF-ASSEMBLED VIOLOGEN MONOLAYER USING QUARTZ CRYSTAL MICROBALANCE

2002 ◽  
Vol 01 (05n06) ◽  
pp. 593-596 ◽  
Author(s):  
J. Y. OCK ◽  
H. K. SHIN ◽  
Y. S. KWON ◽  
S. H. SONG ◽  
S. M. CHANG ◽  
...  
Keyword(s):  
Self Assembly ◽  
Quartz Crystal ◽  
Surface Coverage ◽  
Gold Surface ◽  
Frequency Change ◽  
Self Assembled Monolayer ◽  
Solution Interface ◽  
Reversible Redox ◽  
Mass Detector ◽  
Self Assembled

The electrochemical behavior of viologen self-assembled monolayer has been investigated with QCM, which has been known as ng order mass detector. The self-assembly process of viologen was monitored using resonant frequency (ΔF) and resonant resistance (R). The QCM measurements indicated a mass adsorption for viologen assembling on the gold surface with a frequency change of about 300, 135 Hz and its surface coverage (Γ) was calculated to be 5.02 × 10-9 and 1.64 × 10-9 mol/cm2. A reversible redox process was also observed and analyzed with an ionic interaction at the viologen/solution interface using ΔF.

scholarly journals Self Assembly of semiconductor nanostructures

Respuestas ◽  
2016 ◽  
Vol 12 (2) ◽  
pp. 47-51
Author(s):  
Máximo López-López ◽  
Esteban Cruz-Hernández ◽  
Isaac Martínez-Velis ◽  
Juan Salvador Rojas-Ramírez ◽  
Manolo Ramirez-Lopez ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Molecular Beam Epitaxy ◽  
Self Assembly ◽  
Molecular Beam ◽  
Quantum Wires ◽  
Preferential Growth ◽  
Growth Method ◽  
Strong Surface ◽  
Self Assembled

 Abstract In this work we present the growth and characterization of GaAs self-assembled quantum wires (SAQWRs), and InAs self-assembled quantum dots (SAQDs) by molecular beam epitaxy on (631)-oriented GaAs substrates. Adatoms on the (631) crystal plane present a strong surface diffusion anisotropy which we use to induce preferential growth along one direction to produce SAQWRs. On the other hand, InAs SAQDs were obtained on GaAs(631) with SAQWRs by the Stransky–Krastanov (S-K) growth method. SAQDs grown directly on (631) substrates presented considerable fluctuations in size. We study the effects of growing a stressor layer before the SAQDs formation to reduce these fluctuations.Keywords : Quantum wires, quantum dots; selfassembly; molecular beam epitaxy.

Novel Self-Complimentary Tricyclic Heterocycles: Expanding the Chemistry of Self-Assembled Rosette Nanotubes

2007 ◽  
Vol 1057 ◽  
Author(s):  
Gabor Borzsonyi ◽  
Andrew J. Myles ◽  
Ross Johnson ◽  
Jae-Young Cho ◽  
Takeshi Yamazaki ◽  
...  
Keyword(s):  
Self Assembly ◽  
External Diameter ◽  
Rosette Nanotubes ◽  
Self Assembled

ABSTRACTIn an effort to increase the internal and external diameter of the RNT's, tricyclic GΛC base derivatives (XGΛC) have been synthesized and characterized. Hierchichal self-assembly results in formation of RNT's with an increased diameter, as evidenced by AFM and TEM measurements. Progress on the derivitization and characterization of the XGΛC RNT's will be presented.

Characterization Of SnO2 Nanoparticles Deposited Via Layer-by-Layer Self Assembly And Investigation Of Their Sensing Properties

2002 ◽  
Vol 739 ◽  
Author(s):  
R. C. Ghan ◽  
Y. Lvov ◽  
R. S. Besser
Keyword(s):  
Self Assembly ◽  
High Selectivity ◽  
Sno2 Nanoparticles ◽  
Test Chamber ◽  
The Self ◽  
Layer By Layer ◽  
Product Analysis ◽  
Glass Substrates ◽  
Self Assembled

ABSTRACTA technique of Layer-by-Layer (LbL) self-assembly is used to deposit SnO2 nanoparticles on Quartz Crystal Microbalance (QCM) resonators, and on glass substrates which the authors believe has not been previously reported. Characterization of self-assembled SnO2 layers has been performed using QCM, Scanning Electron Microscopy (SEM), and Zeta Potential analysis.We have successfully deposited SnO2 nanoparticles on QCM resonator using self-assembly technique. LbL self-assembly is a method of organization of ultra-thin films by interlayer electrostatic attraction. The thickness and mass of the self-assembled layers can be characterized by the frequency shift obtained using the QCM and empirical equations relating change in frequency with mass and thickness of deposited layers. The deposition of SnO2 nanolayers exhibited a linear reproducibility and the process of self-assembly was independent of the residence time of QCM resonator in the SnO2 nanoparticle colloidal solution. High resolution SEM analysis reveals that the SnO2 nanoparticle layers are uniformly deposited across the entire substrate. Electrical characterization was performed on SnO2 nanoparticle layers self-assembled on glass substrates which were patterned for two point (current-voltage) IV characteristic measurements. Two classes of samples were used. One sample was self-assembled glass substrate patterned with electrical contacts and calcined (baked at 350°C for one hour) to eliminate interlayered polyions and the other sample was not calcined. Results revealed that the calcined samples demonstrated linear ohmic behavior but the uncalcined showed some spurious points which we believe are due to the polyion layers.Characterization of the self-assembled SnO2 nanoparticles is being carried out with the intention of fabricating a high-selectivity μ-gas sensor. A test chamber has been fabricated and results of resistance behavior of the sensor with variation in temperature have been presented.The sensor can find applications in high selectivity sensing of chemical, industrial, domestic, and hazardous environments. After further research and development, this μ-gas sensors could be made generic to sense a variety of gases and employed for integrated on-chip product analysis in multiple chemical microsystem applications.

scholarly journals Characterization of Self-Assembled 2D Patterns with Voronoi Entropy

2018 ◽  
Author(s):  
Edward Bormashenko ◽  
Mark Frenkel ◽  
Alla Vilk ◽  
Alexander A. Fedorets ◽  
Nurken E. Aktaev ◽  
...  
Keyword(s):  
Self Assembly ◽  
Voronoi Tessellation ◽  
Porous Polymer ◽  
Historical Background ◽  
Mathematical Tool ◽  
Scaling Properties ◽  
Breath Figure Method ◽  
Self Assembled ◽  
Ordered Water

The Voronoi entropy is a mathematical tool for quantitative characterization of the orderliness of points distributed on a surface. The tool is useful to study various surface self-assembly processes. We provide the historical background, from Kepler and Descartes to our days, and discuss topological properties of the Voronoi tessellation, upon which the entropy concept is based, and its scaling properties, known as the Lewis and Aboav-Weaire laws. The Voronoi entropy has been successfully applied to recently discovered self-assembled structures, such as patterned micro-porous polymer surfaces obtained by the breath figure method and levitating ordered water micro-droplet clusters.

Self-assembly of a Benzothiazolone Conjugate to Panchromatic Fluorescent Fibres and its Application in Cellular Imaging

2021 ◽  
Author(s):  
Vivekshinh Kshtriya ◽  
Bharti Koshti ◽  
Ankit Gangrade ◽  
Ashadul Haque ◽  
Ramesh Singh ◽  
...  
Keyword(s):  
Self Assembly ◽  
Cellular Imaging ◽  
The Self ◽  
Synthesis And Characterization ◽  
Self Assembled

We report the synthesis and characterization of the self-assembled structures formed by 4-chloro-2(3H)-benzothiazolone (CBT) to panchromatic fibres and its application in cellular imaging. The aggregation properties of the synthesized compound...

Synthesis and surface characterization of alkylthioacetyl-capped self-assembled monolayers on gold surface

2006 ◽  
Vol 252 (14) ◽  
pp. 5158-5167 ◽  
Author(s):  
Abdiaziz A. Farah ◽  
Raluca Voicu ◽  
Raluca Barjovanu ◽  
Farid Bensebaa ◽  
Kidus Tufa ◽  
...  
Keyword(s):  
Surface Characterization ◽  
Gold Surface ◽  
Self Assembled Monolayers ◽  
Assembled Monolayers ◽  
Self Assembled
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