Copper-Complexed Pirouetting [2]pseudorotaxanes with Sulfur-Containing End-Groups Attached to the Thread: Synthesis, Electrochemical Studies, and Deposition on Gold Electrodes

2009 ◽  
Vol 62 (10) ◽  
pp. 1231 ◽  
Author(s):  
Jean-Paul Collin ◽  
Pierre Mobian ◽  
Jean-Pierre Sauvage ◽  
Angélique Sour ◽  
Yi-Ming Yan ◽  
...  
Keyword(s):  
Fast Moving ◽  
Gold Electrode ◽  
Gold Surface ◽  
Gold Electrodes ◽  
Electrochemical Studies ◽  
End Groups ◽  
Sulfur Containing

Two copper [2]pseudorotaxanes incorporating a macrocycle with two chelating sites (2,9-diphenyl-1,10-phenanthroline and 2,2′,6′,2″-terpyridine) and a thread based on crescent-shaped 2,2′-bipyridine derivatives have been synthesized and characterized. One of the threads was a hindering 2,2′-bipyridine functionalized by two thioctic-ended arms. The second thread was an 8,8′-diphenyl-3,3′-biisoquinoline functionalized by two thioether-ended arms. The electrochemical studies of the two copper [2]pseudorotaxanes, both in solution and anchored on a gold surface, showed only fast-moving systems in solution. The reasons of the inertness of the deposited complexes on gold electrode have been explored.

A Comparative Study of Adsorption of Aliphatic Amines at a Gold Electrode

2005 ◽  
Vol 70 (12) ◽  
pp. 2027-2037 ◽  
Author(s):  
Teresa Łuczak
Keyword(s):  
Gibbs Energy ◽  
Comparative Study ◽  
Gold Electrode ◽  
Surface Coverage ◽  
Standard Gibbs Energy ◽  
Gold Surface ◽  
Experimental Dependence ◽  
Aliphatic Amines ◽  
Solvent Interactions ◽  
Amine Concentration

Adsorption of aliphatic amines (C1-C4) at the gold electrode was studied by tensammetry. It has been established that the experimental dependence between the gold surface coverage (Θ) and the bulk amine concentration (cA) fits satisfactorily both by the Frumkin and Flory-Huggins isotherms. The standard Gibbs energy of adsorption, ∆G°ad at Emax for Θ < 0.8 has been found to increase in the order methylamine < ethylamine < propylamine < butylamine. This is rationalised in terms of surface-adsorbate, adsorbate-adsorbate and adsorbate-solvent interactions.

scholarly journals Molecular bridge-mediated ultralow-power gas sensing

2021 ◽  
Vol 7 (1) ◽  
Author(s):  
Aishwaryadev Banerjee ◽  
Shakir-Ul Haque Khan ◽  
Samuel Broadbent ◽  
Ashrafuzzaman Bulbul ◽  
Kyeong Heon Kim ◽  
...  
Keyword(s):  
Gas Sensing ◽  
Electron Tunneling ◽  
Gold Surface ◽  
Gold Electrodes ◽  
Self Assembled Monolayer ◽  
Output Resistance ◽  
Resistance Change ◽  
Ultralow Power ◽  
Linker Molecules ◽  
Molecular Bridge

AbstractWe report the electrical detection of captured gases through measurement of the quantum tunneling characteristics of gas-mediated molecular junctions formed across nanogaps. The gas-sensing nanogap device consists of a pair of vertically stacked gold electrodes separated by an insulating 6 nm spacer (~1.5 nm of sputtered α-Si and ~4.5 nm ALD SiO2), which is notched ~10 nm into the stack between the gold electrodes. The exposed gold surface is functionalized with a self-assembled monolayer (SAM) of conjugated thiol linker molecules. When the device is exposed to a target gas (1,5-diaminopentane), the SAM layer electrostatically captures the target gas molecules, forming a molecular bridge across the nanogap. The gas capture lowers the barrier potential for electron tunneling across the notched edge region, from ~5 eV to ~0.9 eV and establishes additional conducting paths for charge transport between the gold electrodes, leading to a substantial decrease in junction resistance. We demonstrated an output resistance change of >108 times upon exposure to 80 ppm diamine target gas as well as ultralow standby power consumption of <15 pW, confirming electron tunneling through molecular bridges for ultralow-power gas sensing.

Disposable Gold Electrode Array for Simultaneous Electrochemical Studies

2008 ◽  
Vol 20 (1) ◽  
pp. 91-97 ◽  
Author(s):  
Graciela Priano ◽  
Graciela González ◽  
Mauricio Günther ◽  
Fernando Battaglini
Keyword(s):  
Gold Electrode ◽  
Electrode Array ◽  
Electrochemical Studies

Sulfur-containing terpyridine derivatives: synthesis, coordination properties, and adsorption on the gold surface

2012 ◽  
Vol 61 (12) ◽  
pp. 2265-2281 ◽  
Author(s):  
R. B. Romashkina ◽  
A. G. Majouga ◽  
E. K. Beloglazkina ◽  
D. A. Pichugina ◽  
M. S. Askerka ◽  
...  
Keyword(s):  
Gold Surface ◽  
Coordination Properties ◽  
Sulfur Containing

FORMATION OF GOLD NANOPARTICLES/OLIGOTHIOPHENE DITHIOLS COMPOSITE THIN FILMS BETWEEN MICROGAPPED GOLD ELECTRODES AND THEIR ELECTRONIC PROPERTIES

2002 ◽  
Vol 01 (05n06) ◽  
pp. 557-562 ◽  
Author(s):  
SEISUKE MAEDA ◽  
TAKUJI OGAWA
Keyword(s):  
Gold Nanoparticles ◽  
Coulomb Blockade ◽  
Gold Electrode ◽  
Quartz Crystal ◽  
Gold Surface ◽  
Crystal Oscillator ◽  
Tunneling Mechanism ◽  
Straight Line ◽  
Current Voltage ◽  
Lower Temperature

We have studied the construction and electronic characteristics of a series of devices made from gold microgap electrodes, gold nanoparticles and conjugated oligothiophene dithiols. The formations of gold nanoparticle/oligothiophene dithiol composites on gold surface were monitored by quartz crystal microbalance (QCM) using gold electrode coated crystal oscillator. The formation speed was the fastest for terthiophene dithiol followed by hexathiophene and nanothiophene dithiols, the latter two showed almost the same formation speed. The current–voltage (I/V) curves of these devices were measured at various temperatures to show that at high temperature (>200 K) they were almost straight line; at lower temperature they became parabolic, and at 4 K a completely blocked region appeared between -12 to +12 V. We attributed the parabolic I/V curve to a tunneling mechanism and the blocked region to the Coulomb blockade phenomena.

scholarly journals Tunnelling in alkanes anchored to gold electrodes via amine end groups

2007 ◽  
Vol 18 (42) ◽  
pp. 424010 ◽  
Author(s):  
Giorgos Fagas ◽  
James C Greer
Keyword(s):  
Gold Electrodes ◽  
End Groups

Nanostructured mesoporous gold electrodes detect protein phosphorylation in cancer with electrochemical signal amplification

The Analyst ◽  
2020 ◽  
Vol 145 (20) ◽  
pp. 6639-6648 ◽  
Author(s):  
Emtiaz Ahmed ◽  
Mostafa Kamal Masud ◽  
Md. Shahriar A. Hossain ◽  
Jongbeom Na ◽  
Abu Ali Ibn Sina ◽  
...  
Keyword(s):  
Protein Phosphorylation ◽  
Differential Pulse Voltammetry ◽  
Signal Amplification ◽  
Gold Electrode ◽  
Differential Pulse ◽  
Gold Electrodes ◽  
Phosphorylated Protein ◽  
Electrochemical Signal ◽  
Pulse Voltammetry

A nanostructured mesoporous gold electrode is demonstrated to detect the phosphorylated protein over non-phosphorylated in cancer using electrochemical signal amplification through differential pulse voltammetry in the presence of the [Fe(CN)6]3−/4−.

Self-assembled monolayer formation of a (N5)Fe(ii) complex on gold electrodes: electrochemical properties and coordination chemistry on a surface

2016 ◽  
Vol 45 (47) ◽  
pp. 19053-19061 ◽  
Author(s):  
Charlotte Buron ◽  
Sihem Groni ◽  
Nathalie Ségaud ◽  
Sandra Mazerat ◽  
Diana Dragoe ◽  
...  
Keyword(s):  
Coordination Chemistry ◽  
Electrochemical Properties ◽  
Coordination Sphere ◽  
Gold Electrode ◽  
Gold Electrodes ◽  
Self Assembled Monolayer ◽  
Monolayer Formation ◽  
Self Assembled

The first coordination sphere of (N5)FeII–X complexes grafted on a gold electrode can be tuned in a similar way to that in solution.

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