scholarly journals Modification of Gold Surface with Gold Nanoparticles and Cyclohexyl Dithiocarbamate as a Selective Sensor for Cysteine

2013 ◽  
Vol 2013 ◽  
pp. 1-5 ◽  
Author(s):  
Ehab AlShamaileh ◽  
Haytham Saadeh ◽  
Valerie Favry
Keyword(s):  
Gold Nanoparticles ◽  
Cyclic Voltammetry ◽  
Modified Electrode ◽  
Self Assembly ◽  
Gold Surface ◽  
The Self ◽  
Self Assembled Monolayer ◽  
Chemically Modified ◽  
Modified Surface ◽  
Selective Sensor

The self-assembly of cyclohexylamine dithiocarbamate (C6DTC) on gold (Au) and gold nanoparticles (AuNPs) was studied electrochemically using cyclic voltammetry (CV). Cyclic voltammetry was used to study the systemFe(CN)63-/Fe(CN)64-at the electrode surface of (C6DTC/Au) and (C6DTC/AuNPs). The application of the resulting chemically modified surface as a selective sensor for cysteine, among other amino acids, was investigated. Linear oxidative desorption technique was used to characterize the modified electrode that consists of the self-assembled monolayer of cyclohexylamine dithiocarbamate on gold nanoparticles deposited on Au electrode (C6DTC/AuNPs/Au). The results showed an enhancement in the oxidation peak of cysteine on the modified electrode and hence a greater sensitivity.

scholarly journals Cylindrical Micelles by the Self-Assembly of Crystalline-b-Coil Polyphosphazene-b-P2VP Block Copolymers. Stabilization of Gold Nanoparticles

Molecules ◽  
2019 ◽  
Vol 24 (9) ◽  
pp. 1772 ◽  
Author(s):  
Maria de los Angeles Cortes ◽  
Raquel de la Campa ◽  
Maria Luisa Valenzuela ◽  
Carlos Díaz ◽  
Gabino A. Carriedo ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Block Copolymers ◽  
Self Assembly ◽  
Cationic Polymerization ◽  
The Self ◽  
The Novel ◽  
Selective Solvent ◽  
The Core ◽  
Cylindrical Micelles ◽  
Main Factor

During the last number of years a variety of crystallization-driven self-assembly (CDSA) processes based on semicrystalline block copolymers have been developed to prepare a number of different nanomorphologies in solution (micelles). We herein present a convenient synthetic methodology combining: (i) The anionic polymerization of 2-vinylpyridine initiated by organolithium functionalized phosphane initiators; (ii) the cationic polymerization of iminophosphoranes initiated by –PR2Cl2; and (iii) a macromolecular nucleophilic substitution step, to prepare the novel block copolymers poly(bistrifluoroethoxy phosphazene)-b-poly(2-vinylpyridine) (PTFEP-b-P2VP), having semicrystalline PTFEP core forming blocks. The self-assembly of these materials in mixtures of THF (tetrahydrofuran) and 2-propanol (selective solvent to P2VP), lead to a variety of cylindrical micelles of different lengths depending on the amount of 2-propanol added. We demonstrated that the crystallization of the PTFEP at the core of the micelles is the main factor controlling the self-assembly processes. The presence of pyridinyl moieties at the corona of the micelles was exploited to stabilize gold nanoparticles (AuNPs).

Electrochemical Behavior of a 4-Nitrothiophenol Modified Electrode Prepared by the Self-Assembly Method

1995 ◽  
Vol 171 (2) ◽  
pp. 505-511 ◽  
Author(s):  
Hiromori Tsutsumi ◽  
Shozo Furumoto ◽  
Masayuki Morita ◽  
Yoshiharu Matsuda
Keyword(s):  
Modified Electrode ◽  
Electrochemical Behavior ◽  
Self Assembly ◽  
The Self ◽  
Assembly Method

Recovery and redispersion of gold nanoparticles using the self-assembly of a pH sensitive zwitterionic amphiphile

2014 ◽  
Vol 50 (85) ◽  
pp. 12933-12936 ◽  
Author(s):  
Clara Morita-Imura ◽  
Yoshiro Imura ◽  
Takeshi Kawai ◽  
Hitoshi Shindo
Keyword(s):  
Gold Nanoparticles ◽  
Self Assembly ◽  
Au Nanoparticles ◽  
Ph Sensitive ◽  
The Self ◽  
Ph Responsive

The pH-responsive self-assembly of a zwitterionic amphiphile was expanded to the recovery of gold (Au) nanoparticles. Multilayered lamellae were incorporated into the nanoparticles. Redispersion of nanoparticles was achieved by the transition of self-assembly based on pH.

Preparation of Very Reactive Thiol-Protected Gold Nanoparticles: Revisiting the Brust-Schiffrin Method

2006 ◽  
Vol 6 (3) ◽  
pp. 708-712 ◽  
Author(s):  
Koiti Araki ◽  
Eisuke Mizuguchi ◽  
Hirofumi Tanaka ◽  
Takuji Ogawa
Keyword(s):  
Thin Films ◽  
Gold Nanoparticles ◽  
Surface Functionalization ◽  
Self Assembly ◽  
Gold Clusters ◽  
Layer By Layer ◽  
Inorganic Hybrid ◽  
New Material ◽  
Modified Surface ◽  
Layer Control

The preparation and properties of tert-dodecanethiol protected gold nanoparticles amenable to very rapid surface functionalization by associative mechanism is described. The new material can be easily prepared by controlling the reaction time, because only a limited but enough number of tert-dodecanethiol to stabilize the gold clusters is bond to the surface until about an hour. Accordingly, it can be isolated as a solid and handled much like the highly stabilized Brust-Schiffrin analogues, but reacted very rapidly with any molecular species containing one or multiple functional groups such as thiol, disulfide, pyridine, etc., These characteristics are ideal for the preparation of a variety of new organic–inorganic hybrid nanomaterials by coordinative self-assembly. This possibility was illustrated using meso-tetra(4-pyridyl)porphyrin, which promptly bonded to the reactive protected gold nanoparticles generating a solid that can be grown as thin films with layer-by-layer control on a suitably modified surface.

A self-assembled monolayer on gold nanoparticles modified electrode for simultaneous determination of isoproterenol and uric acid

Measurement ◽  
2015 ◽  
Vol 62 ◽  
pp. 88-96 ◽  
Author(s):  
Mohammad Mazloum-Ardakani ◽  
Afsaneh Dehghani-Firouzabadi ◽  
Mohammad Ali Sheikh-Mohseni ◽  
Ali Benvidi ◽  
Bi-Bi Fatemeh Mirjalili ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Uric Acid ◽  
Simultaneous Determination ◽  
Modified Electrode ◽  
Self Assembled Monolayer ◽  
Self Assembled

Enlargement of Gold Nanoparticles on the Surface of a Self-Assembled Monolayer Modified Electrode:  A Mode in Biosensor Design

2006 ◽  
Vol 78 (14) ◽  
pp. 5227-5230 ◽  
Author(s):  
Nandi Zhou ◽  
Jing Wang ◽  
Ting Chen ◽  
Zhiguo Yu ◽  
Genxi Li
Keyword(s):  
Gold Nanoparticles ◽  
Modified Electrode ◽  
Self Assembled Monolayer ◽  
Self Assembled

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.

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