scholarly journals Antifouling (Bio)materials for Electrochemical (Bio)sensing

2019 ◽  
Vol 20 (2) ◽  
pp. 423 ◽  
Author(s):  
Susana Campuzano ◽  
María Pedrero ◽  
Paloma Yáñez-Sedeño ◽  
José Pingarrón
Keyword(s):  
Metallic Nanoparticles ◽  
Self Assembled Monolayers ◽  
Electrochemical Activation ◽  
Reaction Products ◽  
Diverse Range ◽  
Prolonged Incubation ◽  
Practical Applications ◽  
Electrochemical Biosensing ◽  
Redox Couples ◽  
Assembled Monolayers

(Bio)fouling processes arising from nonspecific adsorption of biological materials (mainly proteins but also cells and oligonucleotides), reaction products of neurotransmitters oxidation, and precipitation/polymerization of phenolic compounds, have detrimental effects on reliable electrochemical (bio)sensing of relevant analytes and markers either directly or after prolonged incubation in rich-proteins samples or at extreme pH values. Therefore, the design of antifouling (bio)sensing interfaces capable to minimize these undesired processes is a substantial outstanding challenge in electrochemical biosensing. For this purpose, efficient antifouling strategies involving the use of carbon materials, metallic nanoparticles, catalytic redox couples, nanoporous electrodes, electrochemical activation, and (bio)materials have been proposed so far. In this article, biomaterial-based strategies involving polymers, hydrogels, peptides, and thiolated self-assembled monolayers are reviewed and critically discussed. The reported strategies have been shown to be successful to overcome (bio)fouling in a diverse range of relevant practical applications. We highlight recent examples for the reliable sensing of particularly fouling analytes and direct/continuous operation in complex biofluids or harsh environments. Opportunities, unmet challenges, and future prospects in this field are also pointed out.

Electrochemical, spectroscopic and microscopic studies of new manganese phthalocyanine complexes in solution and as self-assembled monolayers on gold

2010 ◽  
Vol 14 (07) ◽  
pp. 568-581 ◽  
Author(s):  
Megan Coates ◽  
Edith Antunes ◽  
Tebello Nyokong
Keyword(s):  
Self Assembled Monolayers ◽  
Central Metal ◽  
Atomic Force ◽  
Redox Couples ◽  
Peripheral Position ◽  
Assembled Monolayers ◽  
Microscopic Studies ◽  
Ring Oxidation ◽  
Self Assembled ◽  
Electrochemical Microscopy

Four new manganese(III) phthalocyanines (3a–d), octasubstituted at the peripheral position with pentylthio, decylthio, benzylthio, and phenylthio groups, respectively, were synthesized. Their specific electrochemical, spectroscopic and microscopic properties in solution and as self-assembled monolayers on gold were characterized. The UV-vis spectra confirmed red-shifted Q bands for all the complexes, due to the effect of the central metal and the electron-donating substituents. Three redox couples were visible during cyclic voltammetry studies for the four complexes, and spectroelectrochemistry confirmed the couples as corresponding to MnIIIPc-2/MnIIPc-2 (II) (metal reduction), MnIIPc-2/MnIIPc-3 (III) (ring reduction) and MnIIIPc-1/MnIIIPc-2 (I) (ring oxidation). Electrochemistry was also used to determine the blocking characteristics of the MnPc self-assembled monolayers on gold, which proved to be highly dependent on the type of substituent. Other methods of characterization included Raman spectroscopy, atomic force and scanning electrochemical microscopy analyses of the SAMs.

scholarly journals Intrinsically Polar Piezoelectric Self-Assembled Oligopeptide Monolayers

2021 ◽  
Author(s):  
Christopher Petroff ◽  
Giuseppe Cassone ◽  
Jiří Šponer ◽  
Geoffrey Hutchison
Keyword(s):  
Piezoelectric Materials ◽  
Open Circuit ◽  
Self Assembled Monolayers ◽  
Voltage Response ◽  
Practical Applications ◽  
Considerable Research ◽  
Assembled Monolayers ◽  
Self Assembled ◽  
Open Circuit Voltages ◽  
Piezoelectric Voltage

<div><div><div><p>Flexible, bio-compatible piezoelectric materials are of considerable research interest for a variety of applications, but many suffer from low response or high cost to manufacture. Herein, novel piezoelectric force and touch sensors based on self-assembled monolayers of oligopeptides are presented which produce large piezoelectric voltage response and are easily manufactured without the need for electrical poling. While the devices generate modest piezoelectric charge constants (d33) of up to 9.8 pC N−1, they exhibit immense piezoelectric voltage constants (g33) up to 2 V m N−1. Furthermore, a flexible device prototype is demonstrated that produces open-circuit voltages of nearly 6 V under gentle bending motion. Improvements in peptide selection and device construction promise to further improve the already outstanding voltage response and open the door to numerous practical applications.</p></div></div></div>

scholarly journals Intrinsically Polar Piezoelectric Self-Assembled Oligopeptide Monolayers

2021 ◽  
Author(s):  
Christopher Petroff ◽  
Giuseppe Cassone ◽  
Jiří Šponer ◽  
Geoffrey Hutchison
Keyword(s):  
Piezoelectric Materials ◽  
Open Circuit ◽  
Self Assembled Monolayers ◽  
Voltage Response ◽  
Practical Applications ◽  
Considerable Research ◽  
Assembled Monolayers ◽  
Self Assembled ◽  
Open Circuit Voltages ◽  
Piezoelectric Voltage

<div><div><div><p>Flexible, bio-compatible piezoelectric materials are of considerable research interest for a variety of applications, but many suffer from low response or high cost to manufacture. Herein, novel piezoelectric force and touch sensors based on self-assembled monolayers of oligopeptides are presented which produce large piezoelectric voltage response and are easily manufactured without the need for electrical poling. While the devices generate modest piezoelectric charge constants (d33) of up to 9.8 pC N−1, they exhibit immense piezoelectric voltage constants (g33) up to 2 V m N−1. Furthermore, a flexible device prototype is demonstrated that produces open-circuit voltages of nearly 6 V under gentle bending motion. Improvements in peptide selection and device construction promise to further improve the already outstanding voltage response and open the door to numerous practical applications.</p></div></div></div>

scholarly journals Comparison of the Physicochemical Properties of Carboxylic and Phosphonic Acid Self-Assembled Monolayers Created on a Ti-6Al-4V Substrate

Materials ◽  
2020 ◽  
Vol 13 (22) ◽  
pp. 5137
Author(s):  
Michal Cichomski ◽  
Milena Prowizor ◽  
Dorota Anna Kowalczyk ◽  
Andrzej Sikora ◽  
Damian Batory ◽  
...  
Keyword(s):  
Phosphonic Acid ◽  
Photoelectron Spectroscopy ◽  
Contact Angle Measurement ◽  
Angle Measurement ◽  
Self Assembled Monolayers ◽  
Nanoelectromechanical Systems ◽  
Phosphonic Acids ◽  
Practical Applications ◽  
Assembled Monolayers ◽  
Self Assembled

This study compared the tribological properties in nano- and millinewton load ranges of Ti‑6Al-4V surfaces that were modified using self-assembled monolayers (SAMs) of carboxylic and phosphonic acids. The effectiveness of the creation of SAMs with the use of the liquid phase deposition (LPD) technique was monitored by the contact angle measurement, the surface free energy (SFE) calculation, X-ray photoelectron spectroscopy (XPS), and Fourier-transform infrared spectroscopy (FTIR) measurements. The obtained results indicated that more stable and well-ordered layers, which were characterized by the lowest values of the coefficient of friction, adhesion, and wear rate, were obtained using phosphonic acid as a surface modifier. Based on the obtained results, it was found that the Ti-6Al-4V alloy modified by phosphonic acid would be the most advantageous for practical applications, especially in micro- and nanoelectromechanical systems (MEMS/NEMS).

Monalayer Arrangement of Pt Nanoparticles

1998 ◽  
Vol 4 (S2) ◽  
pp. 738-739
Author(s):  
T. C. Green ◽  
J. M. Petroski ◽  
Z. Wang ◽  
M. El-Sayed
Keyword(s):  
Metallic Nanoparticles ◽  
Solid Phase ◽  
Pt Nanoparticles ◽  
Self Assembled Monolayers ◽  
3 Dimensional ◽  
Assembled Monolayers ◽  
Potential Applications ◽  
Shape Controlled ◽  
Superlattice Structures ◽  
Catalyzed Reactions

Formation of metallic nanoparticles produces an increased surface area per unit volume of material, which provides potential applications in enhancing surface catalyzed reactions. Recently, attention has been focused on moving from the solution based syntheses to solid phase materials by arranging such particles into well ordered 2- and 3- dimensional structures, or forming cluster engineered materials that posses well defined structures. Such studies have shown the importance of size, size distribution, and shape of particles upon self assembled monolayers. We have recently prepared shape-controlled Pt nanoparticles with ﹛111﹜ (tetrahedral), ﹛100﹜ (cubic), and mixed ﹛111﹜ - ﹛100﹜ (truncated octahedral) faces. To study how these faces may orient to form particle point superlattice structures we have prepared monolayer distributions of Pt particles in humidity chambers for analysis by TEM.Our shape controlled Pt particle synthesis yields between 60 and 80 % cubes, tetrahedra, or truncated octahedra with average diameters ≥ 7 nm.

Electrochemical Activation of Self-Assembled Monolayers for the Binding of Effectors

Langmuir ◽  
2020 ◽  
Vol 36 (48) ◽  
pp. 14623-14632
Author(s):  
Aleksandra Markovic ◽  
Leon Buschbeck ◽  
Izabella Brand ◽  
Carsten Dosche ◽  
Jens Christoffers ◽  
...  
Keyword(s):  
Self Assembled Monolayers ◽  
Electrochemical Activation ◽  
Assembled Monolayers ◽  
Self Assembled

Electrochemical behavior of self-assembled monolayers based on functionalized oligothiophenes

1998 ◽  
Vol 95 (6) ◽  
pp. 1339-1342 ◽  
Author(s):  
R. Michalitsch ◽  
A. El Kassmi ◽  
P. Lang ◽  
A. Yassar ◽  
F. Garnier
Keyword(s):  
Electrochemical Behavior ◽  
Self Assembled Monolayers ◽  
Assembled Monolayers ◽  
Self Assembled

Imaging of patterned self-assembled monolayers by scanning photoelectron microscopy

2003 ◽  
Vol 104 ◽  
pp. 459-462 ◽  
Author(s):  
R. Klauser ◽  
M. Zharnikov ◽  
I.-H. Hong ◽  
S.-C. Wang ◽  
A. Gölzhäuser ◽  
...  
Keyword(s):  
Self Assembled Monolayers ◽  
Assembled Monolayers ◽  
Scanning Photoelectron Microscopy ◽  
Self Assembled

Optimization of a New Reactive Force Field for Silver - Based Materials

2020 ◽  
Author(s):  
Clément Dulong ◽  
Bruno Madebène ◽  
Susanna Monti ◽  
Johannes Richardi
Keyword(s):  
Force Field ◽  
Self Assembled Monolayers ◽  
The Novel ◽  
Reactive Force ◽  
Reactive Force Field ◽  
Energetic Properties ◽  
Extended Training ◽  
Geometrical Features ◽  
Assembled Monolayers ◽  
Gold Thiolate

<div><div><div><p>A new reactive force field based on the ReaxFF formalism is effectively parametrized against an extended training set of quantum chemistry data (containing more than 120 different structures) to describe accurately silver- and silver-thiolate systems. The results obtained with this novel representation demonstrate that the novel ReaxFF paradigm is a powerful methodology to reproduce more appropriately average geometric and energetic properties of metal clusters and slabs when compared to the earlier ReaxFF parametrizations dealing with silver and gold. ReaxFF cannot describe adequately specific geometrical features such as the observed shorter distances between the under-coordinated atoms at the cluster edges. Geometric and energetic properties of thiolates adsorbed on a silver Ag20 pyramid are correctly represented by the new ReaxFF and compared with results for gold. The simulation of self-assembled monolayers of thiolates on a silver (111) surface does not indicate the formation of staples in contrast to the results for gold-thiolate systems.</p></div></div></div>

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