scholarly journals Gold Nanocage-Based Electrochemical Sensing Platform for Sensitive Detection of Luteolin

Sensors ◽  
2018 ◽  
Vol 18 (7) ◽  
pp. 2309 ◽  
Author(s):  
Xiaobao Li ◽  
Ruyi Zou ◽  
Yanyan Niu ◽  
Wei Sun ◽  
Taiming Shao ◽  
...  
Keyword(s):  
High Sensitivity ◽  
Electrochemical Sensing ◽  
Carbon Ionic Liquid Electrode ◽  
Optimal Conditions ◽  
Oxidation Peak ◽  
Chemically Modified ◽  
Sensing System ◽  
Redox Peak ◽  
Sensing Platform ◽  
Redox Peak Current

A simple and sensitive electrochemical sensor was developed for the detection of tracelevels of luteolin. The sensoris based on a novel type of chemically modified electrode: gold nanocage (AuNCs)-modified carbon ionic liquid electrode (CILE). To construct this electrochemical sensing platform for luteolin, CILE is initially prepared by using 1-hexylpyridinium hexafluorophosphate as the binder and then AuNCs are coated on the surface of CILE to fabricate AuNCs-modified CILE (AuNCs/CILE). Electrochemical studies have shown that AuNCs/CILE can exhibit enhanced electrocatalytic activity toward the redox reaction of luteolin, therefore, the redox peak current of luteolin can be greatly improved, resulting in the high sensitivity of the developed sensor. Under the optimal conditions, the oxidation peak currents of the sensor increase linearly with an increase in the luteolin concentration in a range from 1 to 1000 nM with a detection limit of 0.4 nM, which is lower than those of most reported electrochemical luteolin sensors. Moreover, the reproducibility, precision, selectivity, and stability of this sensor are excellent. Finally, the sensing system was applied to the analysis of luteolin-spiked drug samples and the recovery in all cases was 95.0–96.7%, indicating the potential application of this simple, facile, and sensitive sensing system in pharmaceutical analysis.

Core-shell Cu@C@ZIF-8 composite: a high-performance electrode material for electrochemical sensing of nitrite with high selectivity and sensitivity

2021 ◽  
Author(s):  
Feng Gao ◽  
Xiaolong Tu ◽  
Yongfang Yu ◽  
Yansha Gao ◽  
Jin Zou ◽  
...  
Keyword(s):  
High Performance ◽  
High Selectivity ◽  
Limit Of Detection ◽  
Metal Organic Framework ◽  
High Sensitivity ◽  
Electrochemical Sensing ◽  
Core Shell ◽  
Zeolitic Imidazolate Framework ◽  
Sensing Platform ◽  
The Difference

Abstract Herein, an efficient electrochemical sensing platform is proposed for selective and sensitive detection of nitrite on the basis of Cu@C@Zeolitic imidazolate framework-8 (Cu@C@ZIF-8) heterostructure. Core-shell Cu@C@ZIF-8 composite was synthesized by pyrolysis of Cu-metal-organic framework@ZIF-8 (Cu-MOF@ZIF-8) in Ar atmosphere on account of the difference of thermal stability between Cu-MOF and ZIF-8. For the sensing system of Cu@C@ZIF-8, ZIF-8 with proper pore size allows nitrite diffuse through the shell, while big molecules cannot, which ensures high selectivity of the sensor. On the other hand, Cu@C as electrocatalyst promotes the oxidation of nitrite, thereby resulting high sensitivity of the sensor. Accordingly, the Cu@C@ZIF-8 based sensor presents excellent performance for nitrite detection, which achieves a wide linear response range of 0.1 µM to 300.0 µM, and a low limit of detection (LOD) of 0.033 µM. In addition, the Cu@C@ZIF-8 sensor possesses excellent stability and reproducibility, and was employed to quantify nitrite in sausage samples with recoveries of 95.45-104.80%.

scholarly journals An Efficient Electrochemical Sensor Driven by Hierarchical Hetero-Nanostructures Consisting of RuO2 Nanorods on WO3 Nanofibers for Detecting Biologically Relevant Molecules

Sensors ◽  
2019 ◽  
Vol 19 (15) ◽  
pp. 3295 ◽  
Author(s):  
Hyerim Lee ◽  
Yeomin Kim ◽  
Areum Yu ◽  
Dasol Jin ◽  
Ara Jo ◽  
...  
Keyword(s):  
Tungsten Trioxide ◽  
High Surface ◽  
High Surface Area ◽  
High Sensitivity ◽  
Annealing Process ◽  
Electrochemical Sensing ◽  
Biologically Relevant ◽  
Sensing Platform ◽  
Thermal Annealing Process ◽  
Biologically Relevant Molecules

By means of electrospinning with the thermal annealing process, we investigate a highly efficient sensing platform driven by a hierarchical hetero-nanostructure for the sensitive detection of biologically relevant molecules, consisting of single crystalline ruthenium dioxide nanorods (RuO2 NRs) directly grown on the surface of electrospun tungsten trioxide nanofibers (WO3 NFs). Electrochemical measurements reveal the enhanced electron transfer kinetics at the prepared RuO2 NRs-WO3 NFs hetero-nanostructures due to the incorporation of conductive RuO2 NRs nanostructures with a high surface area, resulting in improved relevant electrochemical sensing performances for detecting H2O2 and L-ascorbic acid with high sensitivity.

Prussian blue-carboxylated MWCNTs/ZIF-67 composite: a new electrochemical sensing platform for paracetamol detection with high sensitivity

2020 ◽  
Vol 32 (8) ◽  
pp. 085501
Author(s):  
Feng Gao ◽  
Jin Zou ◽  
Wei Zhong ◽  
Xiaolong Tu ◽  
Xigen Huang ◽  
...  
Keyword(s):  
Prussian Blue ◽  
High Sensitivity ◽  
Electrochemical Sensing ◽  
Sensing Platform

High-sensitivity paracetamol sensor based on Pd/graphene oxide nanocomposite as an enhanced electrochemical sensing platform

2014 ◽  
Vol 54 ◽  
pp. 468-475 ◽  
Author(s):  
Junhua Li ◽  
Jinlong Liu ◽  
Gongrong Tan ◽  
Jianbo Jiang ◽  
Sanjun Peng ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
High Sensitivity ◽  
Electrochemical Sensing ◽  
Sensing Platform

scholarly journals Comprehensive Review of High Performing Electrochemical Biosensors for Biomedical and Environmental Applications

2021 ◽  
Vol 2 (7) ◽  
pp. 1-2
Author(s):  
Solomon W Leung
Keyword(s):  
Au Nanoparticles ◽  
Sol Gel ◽  
High Sensitivity ◽  
Electrochemical Sensing ◽  
High Performing ◽  
Sensing System ◽  
Sensor Platform ◽  
Biomedical Diagnosis ◽  
Glass Carbon ◽  
Turn Around Time

Since the outbreak of COVID 19 in 2020, being able to detect diseases and chemicals with quick turn-around time becomes ever so needed and important. We have mounted seven different biocatalysts on a sensor platform to examine the performance of this electrochemical sensing system for the detection of different biomolecules/metabolites and environmental important molecules, with such we also compared how this sensing system fares with literature results of similar measurements. The sensor platform constitutes of a layer of bio composite mounted on different electrodes made out of Au, Ag, Pt, and glass carbon; the bio composite is fabricated with polymers and sol-gel Au nanoparticles with or without an extra layer of branching biomolecules. The targeting species for measurements include NH4+, NO3-, CN-, H2O2, and the biomolecules that post specific biomedical functions/identities. In this report, we provide a systematic update of analyses of this sensing system, including the unique identification potentials and sensitivities. This novel sensing system can be a valuable tool in biomedical diagnosis and environmental forensics; in particular the sensor platform used here, any biomedical diagnosis can be conducted with extremely high sensitivity as long as the biomolecules and their antigens are known.

Synthesis of rGO/TiO2/CdS Nanocomposites and its Enhanced Photoelectrochemical Performance in Determination of Parathion-Methyl

NANO ◽  
2018 ◽  
Vol 13 (05) ◽  
pp. 1850054
Author(s):  
Jian-Jun Shi ◽  
Yan Wang ◽  
Li-Rong Meng ◽  
Jing-Chun Zhu ◽  
Rui-Wen Shu ◽  
...  
Keyword(s):  
Solvothermal Method ◽  
High Sensitivity ◽  
Alkaline Condition ◽  
Optimal Conditions ◽  
Excellent Performance ◽  
Photoelectrochemical Performance ◽  
Sensing System ◽  
The Matrix ◽  
Cds Nanocomposites

A photoelectrochemical (PEC) sensor for the determination of organophosphate pesticides (OPs) was developed based on rGO/TiO2/CdS photoactive nanomaterials. The rGO/TiO2/CdS nanocomposites were prepared by solvothermal method and electrochemical deposition technique successively. The morphologies and structures of the as-prepared nanocomposites were extensively investigated by SEM and XRD. In alkaline condition, p-nitrophenol as the hydrolysate of parathion-methyl (PM) could be obtained by a simple hydrolyzation process. Under optimal conditions, the rGO/TiO2/CdS NPs modified ITO electrode exhibited a good PEC performance toward the hydrolysate of PM. The photocurrent intensity was enhanced with the increase of the concentration of the hydrolysate of PM. The proposed PEC method could detect PM in the range from 0.05[Formula: see text]nmol L[Formula: see text] to 10[Formula: see text]nmol L[Formula: see text] with a detection limit of 0.02[Formula: see text]nmol L[Formula: see text] ([Formula: see text]). Thus, the excellent performance of the rGO/TiO2/CdS nanocomposites serve as the matrix of the sensor, which provides a new way for the fabrication of high-sensitivity PEC sensing system.

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