scholarly journals RHBr/RGO composite material as an enhanced sensing platform can detect Cu2+ with high selectivity

2020 ◽  
Vol 546 ◽  
pp. 042058
Author(s):  
Peng Sun ◽  
Kaibing Xu ◽  
Shanyi Guang ◽  
Hongyao Xu
Keyword(s):  
Composite Material ◽  
High Selectivity ◽  
Sensing Platform

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%.

Preparation of α-Fe2O3/g-C3N4 with C-O-Fe Bonds as a Electrochemical Sensor for Glucose Detection

2021 ◽  
Vol 67 ◽  
pp. 43-54
Author(s):  
Kuan Yang ◽  
Qing Bo Yu ◽  
Hui Qin Li ◽  
Xin Xin Ren ◽  
Jia Pan ◽  
...  
Keyword(s):  
Ascorbic Acid ◽  
Composite Material ◽  
Citric Acid ◽  
Detection Limit ◽  
Binding Energy ◽  
High Selectivity ◽  
Fast Response ◽  
Bet Surface Area ◽  
Glucose Detection ◽  
High Concentrations

The rapid glucose detection is great significance in the food, biological and medical fields. In this paper, we show an unusual strategy for the synthesis of α-Fe2O3/g-C3N4 composite material with C-O-Fe bonds for applications in glucose detection. The structural composition and the existence of C-O-Fe bonds of α-Fe2O3/g-C3N4 were evaluated by XRD, FTIR, SEM, TEM and XPS. Due to the formation of C-O-Fe bonds, the BET surface area and electron transport ability of α-Fe2O3/g-C3N4 are improved. The electrochemical experiments revealed that the α-Fe2O3/g-C3N4 sensor exhibited a fast response time (< 5 s), a low detection limit (2.3 μM) and a wide linear range (0.1 mM - 5 mM). Furthermore, the powerful C-O-Fe binding energy provides a guarantee for the reasonable stability of the α-Fe2O3/g-C3N4 sensor. The presence of high concentrations of KCl, citric acid, ascorbic acid, dopamine and sucrose appeared to have no effects on the detection of glucose, indicating a high selectivity of this sensor.

Highly sensitive detection of microcystin-LR under visible light using a self-powered photoelectrochemical aptasensor based on a CoO/Au/g-C3N4 Z-scheme heterojunction

Nanoscale ◽  
2019 ◽  
Vol 11 (25) ◽  
pp. 12198-12209 ◽  
Author(s):  
Lin Tang ◽  
Xilian Ouyang ◽  
Bo Peng ◽  
Guangming Zeng ◽  
Yuan Zhu ◽  
...  
Keyword(s):  
Visible Light ◽  
High Selectivity ◽  
Sensitive Detection ◽  
Sensing Platform ◽  
Highly Sensitive ◽  
Self Powered ◽  
Highly Sensitive Detection

A novel Z-scheme heterojunction with excellent PEC performance and high selectivity was prepared for constructing an ultrasensitive sensing platform.

Differential Impedance Sensing platform for high selectivity antibody detection down to few counts: A case study on Dengue Virus

2022 ◽  
pp. 113996
Author(s):  
Paola Piedimonte ◽  
Laura Sola ◽  
Marina Cretich ◽  
Alessandro Gori ◽  
Marcella Chiari ◽  
...  
Keyword(s):  
Dengue Virus ◽  
High Selectivity ◽  
Antibody Detection ◽  
Impedance Sensing ◽  
Sensing Platform

Atomic structure of interface of intermetallic compound TiAl and nitride Ti2AIN using HREM and image processing

1991 ◽  
Vol 49 ◽  
pp. 570-571
Author(s):  
E. Sukedai ◽  
H. Mabuchi ◽  
H. Hashimoto ◽  
Y. Nakayama
Keyword(s):  
Mechanical Properties ◽  
Image Processing ◽  
Composite Material ◽  
Intermetallic Compound ◽  
Side Surface ◽  
High Resolution Electron Microscopy ◽  
Hexagonal Structure ◽  
Second Phase ◽  
Resolution Electron ◽  
Compound Tial

In order to improve the mechanical properties of an intermetal1ic compound TiAl, a composite material of TiAl involving a second phase Ti2AIN was prepared by a new combustion reaction method. It is found that Ti2AIN (hexagonal structure) is a rod shape as shown in Fig.1 and its side surface is almost parallel to the basal plane, and this composite material has distinguished strength at elevated temperature and considerable toughness at room temperature comparing with TiAl single phase material. Since the property of the interface of composite materials has strong influences to their mechanical properties, the structure of the interface of intermetallic compound and nitride on the areas corresponding to 2, 3 and 4 as shown in Fig.1 was investigated using high resolution electron microscopy and image processing.

The microstructure of a TiB2/Ti-47 Al composite material

1989 ◽  
Vol 47 ◽  
pp. 674-675
Author(s):  
O. Popoola ◽  
A.H. Heuer ◽  
P. Pirouz
Keyword(s):  
Composite Material ◽  
Ion Beam ◽  
Chemical Properties ◽  
Intermetallic Alloys ◽  
Transmission Electron ◽  
Diamond Polishing ◽  
Al Composite ◽  
The Matrix ◽  
Argon Ion ◽  
And Chemical Properties

The addition of fibres or particles (TiB2, SiC etc.) into TiAl intermetallic alloys could increase their toughness without compromising their good high temperature mechanical and chemical properties. This paper briefly discribes the microstructure developed by a TiAl/TiB2 composite material fabricated with the XD™ process and forged at 960°C.The specimens for transmission electron microscopy (TEM) were prepared in the usual way (i.e. diamond polishing and argon ion beam thinning) and examined on a JEOL 4000EX for microstucture and on a Philips 400T equipped with a SiLi detector for microanalyses.The matrix was predominantly γ (TiAl with L10 structure) and α2(TisAl with DO 19 structure) phases with various morphologies shown in figure 1.

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

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.

Application of pyrometer and standard sample to determine surface temperature of studied materials

2019 ◽  
pp. 9-13
Author(s):  
V.Ya. Mendeleyev ◽  
V.A. Petrov ◽  
A.V. Yashin ◽  
A.I. Vangonen ◽  
O.K. Taganov
Keyword(s):  
Composite Material ◽  
Surface Temperature ◽  
Relative Error ◽  
Wavelength Range ◽  
Standard Sample ◽  
A Priori ◽  
Temperature Changes ◽  
Surface Temperatures ◽  
Relative Errors ◽  
Normal Emissivity

Determining the surface temperature of materials with unknown emissivity is studied. A method for determining the surface temperature using a standard sample of average spectral normal emissivity in the wavelength range of 1,65–1,80 μm and an industrially produced Metis M322 pyrometer operating in the same wavelength range. The surface temperature of studied samples of the composite material and platinum was determined experimentally from the temperature of a standard sample located on the studied surfaces. The relative error in determining the surface temperature of the studied materials, introduced by the proposed method, was calculated taking into account the temperatures of the platinum and the composite material, determined from the temperature of the standard sample located on the studied surfaces, and from the temperature of the studied surfaces in the absence of the standard sample. The relative errors thus obtained did not exceed 1,7 % for the composite material and 0,5% for the platinum at surface temperatures of about 973 K. It was also found that: the inaccuracy of a priori data on the emissivity of the standard sample in the range (–0,01; 0,01) relative to the average emissivity increases the relative error in determining the temperature of the composite material by 0,68 %, and the installation of a standard sample on the studied materials leads to temperature changes on the periphery of the surface not exceeding 0,47 % for composite material and 0,05 % for platinum.

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