Non-enzymatic Glucose Sensor Based on Palladium Coated Nanoporous Gold Film Electrode

2013 ◽  
Vol 66 (9) ◽  
pp. 1097 ◽  
Author(s):  
Nahid Tavakkoli ◽  
Shekofe Nasrollahi
Keyword(s):  
Glucose Sensor ◽  
Dynamic Range ◽  
Gold Film ◽  
Signal To Noise Ratio ◽  
Amperometric Detection ◽  
High Sensitivity ◽  
Glucose Biosensor ◽  
Nanoporous Gold ◽  
Film Electrode ◽  
Voltammetric Detection

The non-enzymatic voltammetric and amperometric detection of glucose using a palladium coated nanoporous gold film electrode is described. The effect of surfactant on the fabrication of nanoporous gold film was also investigated. The voltammetric detection of glucose was performed by cyclic voltammetry. The sensor had good electrocatalytic activity towards oxidation of glucose, exhibited a rapid response (~6 s), and gave a linear range from 1 to 33 mM with a detection limit of 5 μM (with a signal to noise ratio of 3). The wide dynamic range, long-term stability, high sensitivity and selectivity, good reproducibility, and high resistance towards electrode fouling resulted in an ideal inexpensive amperometric glucose biosensor applicable for complex matrices.

scholarly journals Methods for Voltage-Sensitive Dye Imaging of Rat Cortical Activity With High Signal-to-Noise Ratio

2007 ◽  
Vol 98 (1) ◽  
pp. 502-512 ◽  
Author(s):  
Michael T. Lippert ◽  
Kentaroh Takagaki ◽  
Weifeng Xu ◽  
Xiaoying Huang ◽  
Jian-Young Wu
Keyword(s):  
Dynamic Range ◽  
Signal To Noise Ratio ◽  
Field Potential ◽  
High Sensitivity ◽  
High Dynamic Range ◽  
High Signal ◽  
Blue Dye ◽  
Voltage Sensitive Dye ◽  
Imaging Device

We describe methods to achieve high sensitivity in voltage-sensitive dye (VSD) imaging from rat barrel and visual cortices in vivo with the use of a blue dye RH1691 and a high dynamic range imaging device (photodiode array). With an improved staining protocol and an off-line procedure to remove pulsation artifact, the sensitivity of VSD recording is comparable with that of local field potential recording from the same location. With this sensitivity, one can record from ∼500 individual detectors, each covering an area of cortical tissue 160 μm in diameter (total imaging field ∼4 mm in diameter) and a temporal resolution of 1,600 frames/s, without multiple-trial averaging. We can record 80–100 trials of intermittent 10-s trials from each imaging field before the VSD signal reduces to one half of its initial amplitude because of bleaching and wash-out. Taken together, the methods described in this report provide a useful tool for visualizing evoked and spontaneous waves from rodent cortex.

Electrochemical determination of methimazole using nanoporous gold film electrode modified with MoO2 thin film

2019 ◽  
Vol 150 ◽  
pp. 104153 ◽  
Author(s):  
Nahid Tavakkoli ◽  
Nasrin Soltani ◽  
Mehrnoosh Sadeghi ◽  
Hossein Salavati
Keyword(s):  
Thin Film ◽  
Gold Film ◽  
Electrochemical Determination ◽  
Nanoporous Gold ◽  
Film Electrode

A theoretical study of digital silicon photomultiplier utilization in diffuse optical imaging systems

2019 ◽  
Vol 64 (3) ◽  
pp. 357-363 ◽  
Author(s):  
Taha Haddadifam ◽  
Mohammad Azim Karami
Keyword(s):  
Optical Imaging ◽  
Continuous Wave ◽  
Dynamic Range ◽  
Signal To Noise Ratio ◽  
High Sensitivity ◽  
High Dynamic Range ◽  
Diffuse Optical Imaging ◽  
Silicon Photomultiplier ◽  
Thoracic Imaging ◽  
Low Level

Abstract Digital silicon photomultiplier (dSiPM) is introduced for diffuse optical imaging (DOI) applications instead of conventional photomultiplier tubes and avalanche photodiodes (APDs) as a state-of-the-art detector. According to the low-level light regime in DOI applications, high sensitivity and high dynamic range (DR) image sensors are needed for DOI systems. dSiPM is proposed as a developing detector which can detect low-level lights. Also, an accurate equation is obtained for calculating the DR of dSiPMs. Different dSiPMs and the corresponding benefits are studied for DOI applications. Furthermore, a 120 dB DR dSiPM is chosen for use in DOI systems. It is shown that dSiPMs can be utilized in DOI configurations such as time domain (TD), frequency domain (FD) and continuous wave (CW) systems. Ultimately, by utilizing dSiPM in DOI systems, the DOI method can be used for thoracic imaging due to the high DR and signal-to-noise ratio (SNR) of the detector.

scholarly journals Preparation of Ru–Pt bimetallic monolayer on nanoporous gold film electrode and its application as an ultrasensitive sensor for determination of methionine

RSC Advances ◽  
2017 ◽  
Vol 7 (35) ◽  
pp. 21827-21836 ◽  
Author(s):  
Nahid Tavakkoli ◽  
Nasrin Soltani ◽  
Elahe Khorshidi
Keyword(s):  
Gold Film ◽  
Underpotential Deposition ◽  
Nanoporous Gold ◽  
Film Electrode

We report here the fabrication of ruthenium/platinum (RuPt) bimetallic monolayer coated on a nanoporous gold film electrode (RuPtNPGF) by underpotential deposition of copper (UPD) with the Cu layer then replaced spontaneously by Ru and Pt.

scholarly journals High sensitivity fluorescence up-conversion spectroscopy of 3MLCT emission of metal-organic complexes

2019 ◽  
Vol 205 ◽  
pp. 09009 ◽  
Author(s):  
Li Liu ◽  
Damianos Agathangelou ◽  
Thomas Roland ◽  
Olivier Crégut ◽  
Thibaud Duchanois ◽  
...  
Keyword(s):  
Dynamic Range ◽  
Signal To Noise Ratio ◽  
Emission Spectra ◽  
High Sensitivity ◽  
High Signal ◽  
Triplet States ◽  
Organic Complexes ◽  
Metal Organic ◽  
Set Up ◽  
Weak Luminescence

We demonstrate the implementation of a broadband fluorescence up-conversion set-up with high signal-to-noise ratio and dynamic range allowing for the detection of weak luminescence from triplet states in Fe(II) NHC complexes. Based on the experimentally determined radiative rates and the emission spectra, these states have dominant MLCT character.

Enzyme-free glucose sensor based on a three-dimensional gold film electrode

2008 ◽  
Vol 134 (2) ◽  
pp. 471-476 ◽  
Author(s):  
Yu Bai ◽  
Weiwei Yang ◽  
Ying Sun ◽  
Changqing Sun
Keyword(s):  
Glucose Sensor ◽  
Gold Film ◽  
Three Dimensional ◽  
Film Electrode ◽  
Free Glucose

A facile electrochemical approach to fabricate a nanoporous gold film electrode and its electrocatalytic activity towards dissolved oxygen reduction

2015 ◽  
Vol 17 (43) ◽  
pp. 28510-28514 ◽  
Author(s):  
Anandhakumar Sukeri ◽  
Lucas Patricio Hernández Saravia ◽  
Mauro Bertotti
Keyword(s):  
Dissolved Oxygen ◽  
Oxygen Reduction ◽  
Electrocatalytic Activity ◽  
Gold Film ◽  
Reducing Agents ◽  
Nanoporous Gold ◽  
Film Electrode ◽  
Enhanced Sensitivity ◽  
Electrochemical Approach ◽  
Low Overpotential

NPGF electrode was fabricated in absence of alloys, templates & chemical reducing agents and its electrocatalytic activity towards DO reduction was achieved at very low overpotential with enhanced sensitivity.

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