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Sensing chip method for detecting nitrite

A sensor chip, nitrite technology, applied in the field of chemical/biological sensing, achieves the effects of simple production, high flatness and convenient use

Active Publication Date: 2015-04-15
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

About NO 2 - There are many reports on the modified electrodes measured, such as CuPtCl 6 Modified glassy carbon electrode, carbon nanotube modified glassy carbon electrode, polypyrrole nanowire modified electrode, nanogold modified electrode, copper nanoparticle / carbon nanotube / chitosan modified glassy carbon electrode, etc. Particle modified electrodes have not been reported in the literature

Method used

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  • Sensing chip method for detecting nitrite
  • Sensing chip method for detecting nitrite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Assembly preparation of the sensor chip:

[0014] Such as figure 1 As shown, the sensor chip for detecting nitrite includes a gold film substrate 1 modified by gadolinium oxide-titanium dioxide composite nanoparticles, and a corner of the gold layer of the gold film substrate 1 is covered with a plastic insulating layer 3 The metal wires such as copper wire conductors 2 are connected, and the joints are wrapped and sealed with epoxy resin glue 4. The epoxy resin glue 4 used seals and wraps the corner of the gold layer of the gold film substrate 1 with the copper wire 2 to ensure good electrical conductivity and continuity.

[0015] Such as figure 2 As shown, for the gold film substrate 1, its shape is a square, and the selected side length is 6mm, and it is to gradually sputter deposit 300nm SiO on the polished silicon nitride substrate 11. 2 Copper-tin alloy film layer 14 of film layer 12,50nm metal titanium film layer 13,180nm; Copper-tin alloy film layer 14 is sp...

Embodiment 2

[0019] Nitrite detection:

[0020] A conventional electrochemical three-electrode system is adopted: the sensor chip modified by the above-mentioned method to assemble the modified gadolinium oxide-titania composite nanoparticle layer 16 is the working electrode, the platinum wire is the counter electrode, and the silver / silver chloride (saturated potassium chloride) electrode As a reference electrode, the cyclic voltammetry test was carried out. The current response value of the sensor chip electrode and the concentration of nitrite were between 2.0×10 -7 ~2.0×10 -4 It has a linear relationship in the range of mol / L, and the detection limit of nitrite reaches 1.2×10 -7 mol / L.

Embodiment 3

[0022] Reproducibility of the sensor chip:

[0023] The sensing chip modified by 9 gadolinium oxide-titania composite nanoparticle layers 16 modified by the above method is used as the working electrode, the platinum wire is the counter electrode, and the silver / silver chloride (saturated potassium chloride) electrode is used as the reference electrode. respectively for 1.0×10 -5 mol / L and 2.0×10 -6 The nitrite solution sample of mol / L was subjected to cyclic voltammetry test. It can be seen that after nine consecutive measurements, the RSDs of the peak currents were 1.8% and 3.1%, respectively, indicating the reproducibility of the sensor chip detection method. it is good.

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Abstract

The invention discloses a sensing chip for detecting nitrite. The sensing chip comprises a metal substrate (1) modified by gadolinium oxide-titanium dioxide composite nanometer particles, wherein one corner of a gold layer of the metal substrate (1) is connected with a metal wire conductor (2) wrapped by a plastic insulation layer (3), and the connection part is wrapped and sealed by using expoxy resin glue (4); and the metal substrate (1) is formed by gradually sputtering and depositing a SiO2 membrane layer (12), a metal titanium membrane layer (13), a copper-tin alloy membrane layer (14) and a gold membrane layer (15) on a polished silicon nitride substrate (11), the gold membrane layer (15) is subjected to chemical cleaning treatment, and then a modification gadolinium oxide-titanium dioxide composite nanometer particle layer (16) is assembled on the surface of the gold membrane layer (15), thus the sensing chip for detecting nitrite is manufactured. The sensing chip is simple in manufacturing, low in cost and convenient to use and can be used for rapidly detecting trace amounts of nitrite in food.

Description

technical field [0001] The invention relates to a sensor chip for detecting nitrite, which belongs to the technical field of chemical / biological sensing and is suitable for food safety detection. Background technique [0002] Nitrite widely exists in the environment, food, and beverages. In the food industry, nitrite is often used as an additive, which has certain antibacterial and antiseptic effects. Nitrite and amines can generate carcinogenic N-nitrosamines. Due to its potential toxicity, the detection of nitrite content is of great significance both in the field of environmental science and public health. In recent years, methods for the determination of nitrite include spectrophotometry, chromatography, and electrochemical methods. Among these methods, the electrochemical method is widely used for the determination of nitrite due to its high sensitivity, convenience, rapidity and low cost. due to NO 2 - There is a high overpotential on the bare electrode, which is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/48
Inventor 曹忠何婧琳张慢乐张玲朱爽丽伍娉
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY