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Gas sensor based on carbon nanotubes and metal nanoparticles and construction method thereof

A technology of metal nanoparticles and gas sensors, applied in the direction of material electrochemical variables, etc., to achieve the effect of scientific construction methods

Inactive Publication Date: 2018-08-14
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the interaction of the measured molecules on the surface of the two and the sensing mechanism have yet to be revealed.

Method used

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  • Gas sensor based on carbon nanotubes and metal nanoparticles and construction method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The process and steps of using carbon nanotubes and metal nanoparticles to construct methanol sensors are as follows:

[0027] 1) Thiol-covered gold nanoparticles

[0028] 1.5×10 ‐2 mol / L of HAuCl 4 Solution 50ml, add 1.6×10 ‐2 The tetraoctylammonium bromide / toluene 50ml of mol / L mmol forms organic phase, adds 1.5 * 10 ‐4 mol / L of decylthiol (CH 3 (CH 2 ) 9 SH) 10ml and 25mL of 0.25mol / L sodium borohydride solution, by stirring overnight to obtain decanethiol (CH 3 (CH 2 ) 9 SH) covered gold nanoparticles with a size of ~2 nm, after which 2.0 × 10 ‐2 mol / L of 1,9‐nonanedithiol (HS(CH 2 ) 9 SH) 10ml, through the replacement principle, use 1,9‐nonanedithiol (HS(CH2)9SH) to replace decylthiol (CH3(CH2) on the particle surface 9 SH).

[0029] 2) Assembling nanoparticles on carbon nanotubes

[0030] The purchased multi-walled carbon nanotubes (diameter ~ 23 nanometers) are dispersed in hexane so that the mass concentration is 0.30 mg / ml, and the above-mentioned...

Embodiment 2

[0038] The process and steps of using carbon nanotubes and metal nanoparticles to construct 1-propanol sensors are as follows:

[0039] 1) Thiol-covered gold nanoparticles

[0040] 1.7×10 ‐2 mol / L of HAuCl 4 Solution 50ml, add 1.6×10 ‐2 The tetraoctylammonium bromide / toluene of mol / L forms organic phase 50ml, adds 1.7×10 ‐4 mol / L of decylthiol (CH 3 (CH 2 ) 9 SH10ml and 25mL 0.28mol / L sodium borohydride solution, by stirring overnight to obtain decyl mercaptan (CH 3 (CH 2 ) 9 SH) covered gold nanoparticles with a size of ~3 nm, after which 2.4 × 10 ‐2 mol / L of 1,9‐nonanedithiol (HS(CH 2 ) 9 SH) 10ml, through the replacement principle, use 1,9‐nonanedithiol (HS(CH2)9SH) to replace decylthiol (CH3(CH2) on the particle surface9 SH).

[0041] 2) Assembling nanoparticles on carbon nanotubes, the method is the same as in Example 1. The type, concentration and process of the reagents used remained unchanged.

[0042] 3) The complex is assembled on the surface of the mic...

Embodiment 3

[0048] The process and steps of using carbon nanotubes and metal nanoparticles to construct a toluene sensor are as follows:

[0049] 1) Gold nanoparticles covered with thiol, the method is the same as in Example 1. The type, concentration and process of the reagents used remained unchanged.

[0050] 2) Assembling nanoparticles on carbon nanotubes, the method is the same as in Example 1. The type, concentration and process of the reagents used remained unchanged.

[0051] 3) The complex is assembled on the surface of the microelectrode, and the method is the same as in Example 1. The type, concentration and process of the reagents used remained unchanged.

[0052] 4) Sensing device and signal collection

[0053] The aforementioned microelectrode was placed in a custom-made air chamber made of Teflon material, with the size of a 2 cm long cube. Toluene of 100ppm, 200ppm, 300ppm, 500ppm, 600ppm (ppm means milligram per liter) was brought into the air chamber made of Teflon ...

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Abstract

The invention discloses a gas sensor based on carbon nanotubes and metal nanoparticles and a construction method thereof. The construction method comprises the following specific steps: 1) mixing andstirring an HAuCl4 solution, a toluene solution of tetraoctyl ammonium bromide, a decanethiol solution and a sodium borohydride solution to obtain a gold nanoparticle solution covered with decanethiol; then adding 1,9-nonanedithiol and stirring to prepare gold nano-sol covered with the 1,9-nonanedithiol; 2) mixing a carbon nanotube hexane dispersion solution and the gold nano-sol covered with the1,9-nonanedithiol and stirring to form a compound solution; 3) immersing a micro-electrode into the compound solution, and adding a dichloromethane solution of a crosslinking agent and stirring at room temperature; finally, washing and drying the micro-electrode by blowing; connecting the micro-electrode with a multi-path electrical universal meter, and putting into a gas chamber so as to realizeconstruction of the gas sensor. The gas sensor disclosed by the invention can be used for qualitatively and quantitatively detecting common gas including alcohols, aldehydes, benzenes, alkanes and thelike in the atmosphere and has high sensitivity.

Description

technical field [0001] The invention relates to the technical field of gas sensors, in particular to a gas sensor based on carbon nanotubes and metal nanoparticles and a construction method thereof. Background technique [0002] Monolayer capping agent or molecularly connected metal nanoparticles as one of the components of the sensing device film has become an important method to construct a variety of highly sensitive electrochemical sensors and has been widely used. This type of sensor not only needs to have stable performance, but also has a significant surface area for the assembly or adsorption of the measured object. In addition, it should also have unique electrical properties in the application field of electrochemical gas sensing. [0003] As an electronic material, carbon nanotubes have semiconducting properties, and their unique physical and chemical properties make them one of the important materials for adjusting the surface properties of catalysts, chemical an...

Claims

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Application Information

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IPC IPC(8): G01N27/30
Inventor 成汉文孙瑶馨陈家辉路畅陈明洋罗谨
Owner SHANGHAI INST OF TECH
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