Sensing chip method for detecting mercury ions

A sensor chip and mercury ion technology, applied in the field of chemical/biological sensing, can solve the problems of inconvenient and rapid detection, and achieve the effect of easy surface modification, simple production and high flatness

Active Publication Date: 2013-10-09
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods often require expensive precision instruments, complicated sample preparation procedures and skilled operators, and it is impossible or inconvenient to perform rapid detection outdoors.

Method used

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  • Sensing chip method for detecting mercury ions
  • Sensing chip method for detecting mercury ions

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Assembly preparation of the sensor chip:

[0015] Such as figure 1 As shown, the sensor chip for detecting mercury ions includes a gold film substrate 1 modified by a 11-mercaptoundecanoic acid film layer 16, and a corner of the gold layer of the gold film substrate 1 is insulated from the outside with plastic. The metal wires of layer 3 are connected with each other such as copper wire conductors 2, 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.

[0016] 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 fil...

Embodiment 2

[0019] Detection of mercury ions:

[0020] Adopt conventional electrochemical primary cell test system: the sensor chip modified by the 11-mercaptoundecanoic acid film layer 16 modified by the above-mentioned method is used as the working electrode, and the saturated calomel electrode is used as the reference electrode, and the electrochemical potential test is carried out. The potential response value of the sensor chip electrode and the concentration of mercury ions are at 1.0×10 -8 ~ 1.0×10 -4 It has a linear relationship in the range of mol / L, and the lower limit of detection for mercury ions reaches 5.6×10 -9 mol / L.

Embodiment 3

[0022] Reproducibility of the sensor chip:

[0023] The sensor chip modified by 10 11-mercaptoundecanoic acid film layers 16 modified by the method described above was used as the working electrode, and the saturated calomel electrode was used as the reference electrode, respectively for 1.0×10 -5 mol / L and 1.0×10 -4 The mol / L mercury ion solution samples were tested for electrochemical potential. It can be seen that after 10 consecutive measurements, the relative standard deviations were 0.52% and 0.34%, respectively, indicating that the detection method of the sensor chip has good reproducibility.

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Abstract

The invention discloses a sensing chip for detecting mercury ions. The sensing chip comprises a metal substrate (1) modified by a 11-sulfydryl hendecanoic acid membrane layer (16), 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 11-sulfydryl hendecanoic acid membrane layer (16) is assembled on the surface of the gold membrane layer (15), thus the sensing chip for detecting the mercury ions 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 mercury ions in environments.

Description

technical field [0001] The invention relates to a sensor chip for detecting mercury ions, belongs to the technical field of chemical / biological sensing, and is suitable for environmental safety detection. Background technique [0002] Mercury pollution is a global problem that has received increasing attention due to its highly toxic and bioaccumulative properties. Divalent mercury ion (Hg 2+ ) is the most stable inorganic mercury, present in natural water bodies, Hg 2+ Even trace concentrations can produce toxicity. It can accumulate in organisms and be transferred to the human body through the food chain. The trace amounts of mercury accumulated in the human body cannot be excreted through its own metabolism, which will directly cause heart, liver, and thyroid diseases, and cause nervous system diseases. disorders, chronic mercury poisoning, and even trigger the formation of malignant tumors. Secondly, the ecological methylation product of mercury ions, methylmercury, i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/26G01N27/30
Inventor 曹忠曹婷婷吴玲肖忠良黄大凯宋天铭
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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