Conveniently assembling dithiocarbamate and gold nanoparticles onto the gold electrode: A new type of electrochemical sensors for biomolecule detection

Sucrose sensor has been made by deposited the active materials on the surface of gold electrode. The active materials, i.e. polyaniline (PANI), invertase and gold nanoparticles, were deposited step by step. Aniline polymerization were conducted electrochemically at potential -500 to 1000 mV using voltammetry method with sweep rate 50 mV/s for 20 cycles in HCl solution pH 1.5. The modified electrode obtained was immersed in invertase 1 M phosphate buffer solution pH 6. The invertase trapping in polyaniline was performed using the same condition as aniline polymerization. Then, gold nanoparticles were deposited on the polyaniline-invertase modified gold electrode using Layer by Layer (LbL) technique. The polyaniline-invertase-gold nanoparticles modified gold electrode obtained was used to measure sucrose solution. Electrochemical signal of polyaniline (PANI)-invertase-gold nanoparticles modified gold electrode is increase with sucrose concentration. The sensitivity and detection limit of the electrode are 0.4657 µA mm-2 mM-1 and 9 µM, respectively. No electrochemical interference signals from fructose and glucose have been observed in the sucrose measurement.

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Fabrication of Highly Sensitive and Selective Electrochemical Sensors for Detection of Paracetamol by Using Piroxicam Stabilized Gold Nanoparticles

Journal of The Electrochemical Society ◽

10.1149/2.0811709jes ◽

2017 ◽

Vol 164 (9) ◽

pp. B427-B434 ◽

Cited By ~ 4

Author(s):

Syeda Sara Hassan ◽

Sallahuddin Panhwar ◽

Ayman Nafady ◽

Abdullah M. Al-Enizi ◽

Sirajuddin ◽

...

Keyword(s):

Gold Nanoparticles ◽

Electrochemical Sensors ◽

Highly Sensitive

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Recognition and determination of bovine hemoglobin using a gold electrode modified with gold nanoparticles and molecularly imprinted self-polymerized dopamine

Microchimica Acta ◽

10.1007/s00604-015-1594-5 ◽

2015 ◽

Vol 182 (15-16) ◽

pp. 2477-2483 ◽

Cited By ~ 20

Author(s):

Lu Li ◽

Limei Fan ◽

Yunlong Dai ◽

Xianwen Kan

Keyword(s):

Gold Nanoparticles ◽

Gold Electrode ◽

Bovine Hemoglobin ◽

Molecularly Imprinted

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

International Journal of Nanoscience ◽

10.1142/s0219581x02000668 ◽

2002 ◽

Vol 01 (05n06) ◽

pp. 557-562 ◽

Cited By ~ 3

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.

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