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Production of low-density carbon nanotube array composite electrode and application of same and in glucose sensor

A carbon nanotube array and composite electrode technology, which is applied in the direction of instruments, scientific instruments, and electrochemical variables of materials, to achieve the effects of wide detection linear range, high sensitivity, and low response

Inactive Publication Date: 2014-12-24
SHANGHAI SECOND POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Professor Huang Shaoming of Wenzhou University developed a Ni / CNT array composite electrode, and the resulting sensor sensitivity is 1438μA mM -1 cm -2 , but the linear detection range is only 1μM-1mM

Method used

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  • Production of low-density carbon nanotube array composite electrode and application of same and in glucose sensor
  • Production of low-density carbon nanotube array composite electrode and application of same and in glucose sensor
  • Production of low-density carbon nanotube array composite electrode and application of same and in glucose sensor

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] Composite electrodes were prepared using the following steps:

[0069] 1. Select the surface with SiO 2 Oxide layer of silicon wafer as the substrate, where SiO 2 Layer as an insulating layer, its thickness is between 100-200nm.

[0070] 2. Cut the silicon wafer into 25×3mm rectangular test pieces, ultrasonically clean them with acetone, isopropanol (IPA) and deionized water for 5-8 minutes respectively, and then dry them with a nitrogen gun for later use.

[0071] 3. Place the rectangular test piece in the magnetron sputtering chamber, cover the working area with PTFE vacuum tape and aluminum foil, set the sputtering power to 50-100W, and the working pressure to 3.5×10 -3 mbar, the target material is a tungsten target with a purity of 99.99%, and the sputtering gas is high-purity argon. The thickness of tungsten as the conductive layer is between 30-60nm.

[0072] 4. Place high-purity ITO and nickel targets in a multi-target magnetron sputtering apparatus, and cove...

Embodiment 2

[0077] Composite electrodes were prepared using the following steps:

[0078] 1. repeat the 1-4 steps in the embodiment (1)

[0079] 2. Sputter a layer of Ni film on the basis of the ITO film. The thickness of the Ni layer has an important influence on the growth and density of the CNT array. When the thickness is 8nm, the CNT array density is 10 8 -10 9 / cm 2 .

[0080] 3. Repeat the 6th step in embodiment (1)

[0081] 4. Place the CNT array sample in magnetron sputtering, using a high-purity Ni target, set the sputtering power to 50-100W, and the working pressure to 3.5×10 -3 mbar, the sputtering gas is high-purity argon, the sputtering time is 180 seconds, and the diameter of the nano-Ni particles is about 4nm (see attached image 3 ). In order to obtain nanoscale Ni particles, the deposition rate of Ni is as slow as

Embodiment 3

[0083] Composite electrodes were prepared using the following steps:

[0084] 1. repeat the 1-4 steps in the embodiment (1)

[0085] 2. Sputter a layer of Ni film on the basis of the ITO film. The thickness of the Ni layer has an important influence on the growth and density of the CNT array. When the thickness is 15nm, the CNT array density is 10 9 -10 10 / cm 2 .

[0086] 3. Repeat the 6th step in embodiment (1)

[0087] 4. Place the CNT array sample in magnetron sputtering, using a high-purity Ni-Fe alloy target, set the sputtering power to 50-100W, and the working pressure to 3.5×10 -3 mbar, the sputtering gas is high-purity argon, the sputtering time is 360 seconds, and the diameter of nano-Ni-Fe composite particles is about 9 nm.

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Abstract

The invention relates to production of a low-density carbon nanotube array composite electrode and the application of the same and in a glucose sensor. A carbon nanotube array is directionally grown on a substrate of the low-density carbon nanotube array composite electrode; metal nanoparticles adhere to the top and the tube wall of a carbon nanotube of the carbon nanotube array; the density of the carbon nanotube array is 10<8> to 10<10> every square centimeter. The response of the low-density carbon nanotube array composite electrode to a glucose solution is good under the non-enzymatic condition, the sensitivity can reach 1000 to 1500 microamperes millimeter<minus 1> centimeter<minus 2>, the linear detection range is 5 microns to 7 millimeters, and the influence of common interfering substances can be eliminated. The low-density carbon nanotube array composite electrode can be directly produced on a silicon substrate and accordingly the combination with a semiconductor or MEMS (Micro-Electro-Mechanical System) process is good.

Description

technical field [0001] The invention relates to the preparation of a low-density carbon nanotube array and its composite electrode by using a micro-nano processing method, especially for constructing an enzyme-free glucose sensor device, and belongs to the fields of electrochemical detection and analysis, electronic components and public health. Background technique [0002] As an invisible killer of health, diabetes is one of the diseases with the most patients in the world. "White Paper on the Health of China's Urban Population" pointed out that the prevalence of diabetes in my country was 0.84% ​​in the 1980s, 3.2% in 1995, and 9.7% in 2007, an increase of 10 times in 20 years. It is speculated that diabetes in China The number of sick people has reached 92.4 million. Diabetes has become the third most dangerous disease after cardiovascular and cancer. [0003] At present, most glucose sensors (in vitro or implanted) are based on the specific selectivity of glucose oxida...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/30G01N27/416
Inventor 朱志刚陈诚吴益华
Owner SHANGHAI SECOND POLYTECHNIC UNIVERSITY
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