Poisonous and harmful gas detection chip and preparation method thereof

A technology for detecting harmful gases and chips, applied in measuring devices, material analysis through electromagnetic means, instruments, etc., can solve problems such as no substantive breakthroughs, achieve detection cost automation, small individual differences in chips, and flexible combination Effect

Inactive Publication Date: 2012-01-25
上海汶昌芯片科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the gas analysis and detection system based on the microfluidic chip obtains the type and concentration of the measured gas through the current change generated by the oxidation / reduction reaction of the gas, and there has been no substantial breakthrough in the application field.

Method used

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  • Poisonous and harmful gas detection chip and preparation method thereof
  • Poisonous and harmful gas detection chip and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034]Use computer-aided design (CAD) to draw the microchannel pattern of the microfluidic chip, and then use the laser printer to print the pattern as a photomask, and then use an excimer laser etching machine to prepare on the surface of polymethyl methacrylate (PMMA) substrate. Chip microchannel network required. After cutting the PMMA substrate, wash it with ethanol, deionized water, and ethanol, and then dry it naturally to obtain two pieces of PMMA chips (5×5 cm) up and down. After calcining multi-walled carbon nanotubes (MWNTs) at 550 °C for 30 min, put them into concentrated mixed acid (concentrated nitric acid / concentrated perchloric acid, volume ratio 7:3) for ultrasonic oscillation for 30 min, boil and reflux for 2 h under magnetic stirring, and filter Rinse repeatedly with twice distilled water, then with ethanol, and dry at 80°C for later use. The Pt sheet (0.4×0.4mm) was repeatedly polished with fine metallographic sandpaper, and then corroded in newly prepared ...

Embodiment 2

[0036] Use computer-aided design (CAD) to draw the microchannel pattern of the microfluidic chip, and use soft etching technology (photolithography-mask) to etch the required microchannel network on the surface of the upper and lower glass (5×5cm) . Clean the glass chip base material with detergent, deionized water, ethanol, deionized water and ethanol, and then dry it naturally to obtain upper and lower PC chips (5×5 cm). The working electrode (Pt sheet, 0.4×0.4mm) was laser etched to obtain multiple ~1 micron lattices on the surface, and then electrochemical platinum deposition was performed. Nano-scale platinum particles were deposited on the surface of the platinum sheet to obtain a surface with micro / Nanostructured platinum electrodes. The counter electrode (platinum electrode) and reference electrode (silver chloride / silver electrode) were placed in the electrode microgrooves of the upper chip, and the working electrode (platinum electrode) was placed in the microgroov...

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Abstract

The invention relates to a poisonous and harmful gas detection chip and a preparation method thereof. For a chip detection system, a reaction microchannel, a fluid microchannel, an electrode microchannel and a microfluid driving region are processed on a microfluidic chip, so that the integration of a plurality of functional units is realized. An electrochemical oxidation/reduction reaction of poisonous and harmful gas is performed on the surface of an electrode slice embedded in the reaction microchannel; electrolysis is carried out to generate the change of an electrochemical signal; and an electrochemical detector obtains the type and concentration information of the analysed gas by analysing the change of the electrochemical signal.

Description

technical field [0001] The invention relates to a toxic and harmful gas detection chip and a preparation method thereof. The chip gas detection system makes full use of the characteristics that microfluidic chips are easy to integrate multiple functional units, and integrates microfluidic drive, electrode modification, electrochemical reaction, electrochemical Signal processing, detection and analysis are integrated on a small microfluidic chip, and the electrochemical oxidation / reduction reaction of the gas to be analyzed on the electrode sheet on the surface of the reaction microchannel is used to generate the change of the electrochemical signal. By analyzing the change of the electrochemical signal, the Detect the type and concentration of gas. Background technique [0002] With the rapid development of social economy and the over-exploitation of environmental resources, environmental pollution has attracted more and more people's attention. For example, poisonous and ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/416
Inventor 聂富强
Owner 上海汶昌芯片科技有限公司
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