Preparation of Copper and Nickel-Based Oxide Self-Supporting Electrode by Electrochemical Etching Method for the Detection of Glucose

It is of great significance to prepare electrochemical glucose sensors with high selectivity and stability via effective and rapid methods. In this work, the self-support electrode with copper and nickel-based oxide is prepared by chemical-etching reaction which occurred under the property of electrochemical potential difference. In this processing, nickel foam is etched selectively by Cu[Formula: see text] ions and they not only act as self-supporting electrode substrate, but also as nickel ions precursor of NiO. Moreover, the reaction can be completely satisfied on 30 min at room temperature. As a self-supporting electrode nonenzymic glucose electrochemical sensor, the electrode exhibited a wide linear range (0.04–3.00[Formula: see text]mM), low detection limit (0.02[Formula: see text]mM) with high sensitivity of 1096[Formula: see text][Formula: see text] and good selectivity, repeatability and stability. Furthermore, the application of the prepared sensor provides an avenue for the application of the transition metal materials in the field of electrochemical sensing.

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

Nanotechnology ◽

10.1088/1361-6528/ac3da7 ◽

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%.

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Selective oxidation of aniline into azoxybenzene catalyzed by Nb-peroxo@iron oxides at room temperature

New Journal of Chemistry ◽

10.1039/d0nj00520g ◽

2020 ◽

Vol 44 (21) ◽

pp. 8710-8717

Author(s):

André L. D. Lima ◽

Humberto V. Fajardo ◽

André E. Nogueira ◽

Márcio C. Pereira ◽

Luiz C. A. Oliveira ◽

...

Keyword(s):

Iron Oxides ◽

Selective Oxidation ◽

Room Temperature ◽

High Selectivity

Nb-peroxo@iron oxides show high selectivity and activity in aniline conversion to azoxybenzene.

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UV-assisted High-sensitivity Room-temperature Pd-gated HEMT NO2Gas Sensor

2021 5th IEEE Electron Devices Technology & Manufacturing Conference (EDTM) ◽

10.1109/edtm50988.2021.9420958 ◽

2021 ◽

Author(s):

Chong Xing ◽

Dongcheng Xie ◽

Haochen Zhang ◽

Kang Song ◽

Lei Yang ◽

...

Keyword(s):

Room Temperature ◽

High Sensitivity

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Phytic acid functionalized magnetic bimetallic metal–organic frameworks for phosphopeptide enrichment

Journal of Materials Chemistry B ◽

10.1039/d0tb02517h ◽

2021 ◽

Vol 9 (7) ◽

pp. 1811-1820

Author(s):

Shuang Yan ◽

Bin Luo ◽

Jia He ◽

Fang Lan ◽

Yao Wu

Keyword(s):

Phytic Acid ◽

Efficient Method ◽

High Selectivity ◽

Metal Organic Framework ◽

Metal Organic Frameworks ◽

High Sensitivity ◽

Phosphopeptide Enrichment ◽

Metal Organic ◽

Organic Framework

Novel bimetallic metal–organic framework nanocomposites were fabricated by a facile yet efficient method. The as-prepared nanomaterial exhibited high sensitivity and high selectivity toward phosphopeptides and good reusability of five cycles for enriching phosphopeptides.

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Fabrication of Graphene Nanomesh FET Terahertz Detector

Micromachines ◽

10.3390/mi12060641 ◽

2021 ◽

Vol 12 (6) ◽

pp. 641

Author(s):

Yuan Zhai ◽

Yi Xiang ◽

Weiqing Yuan ◽

Gang Chen ◽

Jinliang Shi ◽

...

Keyword(s):

Room Temperature ◽

Energy Gap ◽

Coupling Efficiency ◽

High Sensitivity ◽

Fabrication Process ◽

Monolayer Graphene ◽

Terahertz Waves ◽

Wet Process ◽

Graphene Nanomesh ◽

Thz Detector

High sensitivity detection of terahertz waves can be achieved with a graphene nanomesh as grating to improve the coupling efficiency of the incident terahertz waves and using a graphene nanostructure energy gap to enhance the excitation of plasmon. Herein, the fabrication process of the FET THz detector based on the rectangular GNM (r-GNM) is designed, and the THz detector is developed, including the CVD growth and the wet-process transfer of high quality monolayer graphene films, preparation of r-GNM by electron-beam lithography and oxygen plasma etching, and the fabrication of the gate electrodes on the Si3N4 dielectric layer. The problem that the conductive metal is easy to peel off during the fabrication process of the GNM THz device is mainly discussed. The photoelectric performance of the detector was tested at room temperature. The experimental results show that the sensitivity of the detector is 2.5 A/W (@ 3 THz) at room temperature.

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High sensitivity carbon monoxide sensors made by zinc oxide modified gated GaN/AlGaN high electron mobility transistors under room temperature

Applied Physics Letters ◽

10.1063/1.3596440 ◽

2011 ◽

Vol 98 (22) ◽

pp. 223504 ◽

Cited By ~ 21

Author(s):

S. C. Hung ◽

C. W. Chen ◽

C. Y. Shieh ◽

G. C. Chi ◽

R. Fan ◽

...

Keyword(s):

Carbon Monoxide ◽

Zinc Oxide ◽

Electron Mobility ◽

Room Temperature ◽

High Sensitivity ◽

High Electron Mobility Transistors ◽

High Electron ◽

High Electron Mobility ◽

Electron Mobility Transistors

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Evaluation Humidity Sensing Properties of Graphene/HS-TiO2 Nanocomposites

Journal of Nanoscience and Nanotechnology ◽

10.1166/jnn.2021.19446 ◽

2021 ◽

Vol 21 (10) ◽

pp. 5143-5149

Author(s):

Zhen Zhu ◽

Wang-De Lin

Keyword(s):

Room Temperature ◽

Response Times ◽

Sol Gel ◽

Hollow Spheres ◽

High Sensitivity ◽

Humidity Sensing ◽

X Ray ◽

Transmission Electron ◽

Recovery Times ◽

Relative Humidity Range

This paper reports on a nanocomposite synthesized by sol–gel procedure comprising graphene sheets with hollow spheres of titanium dioxide (G/HS-TiO2) with varying weight percentages of graphene for the purpose of humidity sensors. The surface morphology of the nanocomposite was characterized using transmission electron microscopy (TEM) and energy dispersive X-ray spectroscopy (EDX). The structural properties were examined using X-ray diffraction (XRD) and Fourier-transform infrared spectroscopy (FTIR). The response to 12–80% RH at room temperature exhibited sensitivity (S = 135). However, the relative humidity range of 12–90% at room temperature exhibited higher sensitivity (S = 557). Sensors fabricated using the proposed nanocomposite exhibited high sensitivity to humidity, high stability, rapid response times, and rapid recovery times with hysteresis error of less than 1.79%. These results demonstrate the outstanding potential of his material for the monitoring of atmospheric humidity. This study also sought to elucidate the mechanisms underlying humidity sensing performance.

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