Molybdenum oxide nanobelt/graphene composite material and application of composite material in aspect of preparation of hydrogen-sensitive element

A technology of composite materials and sensitive components, applied in the direction of nanotechnology, nanotechnology, material resistance, etc., can solve the problems of repeatability and poor reliability, and achieve the effects of high controllability, short preparation cycle and high output

Inactive Publication Date: 2015-07-15
HUBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, the repeatability and reliability of the current composite method for preparing one-dimensional molybdenum oxide and graphene are poor, and both need to be further improved.

Method used

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  • Molybdenum oxide nanobelt/graphene composite material and application of composite material in aspect of preparation of hydrogen-sensitive element
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  • Molybdenum oxide nanobelt/graphene composite material and application of composite material in aspect of preparation of hydrogen-sensitive element

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] A preparation method of molybdenum oxide nanobelt / graphene composite material, comprising the steps of:

[0048] Step A: Preparation of Graphene Oxide

[0049] a1) Weigh 3.0g of graphite powder and 18.0g of potassium permanganate into a 1000ml beaker, stir for 10min with a glass rod, and mix well to obtain a solid mixed powder;

[0050] a2) Measure 360ml of concentrated sulfuric acid with a mass fraction of 98% and 40ml of concentrated phosphoric acid with a mass fraction of 65%, respectively, and add them to the beaker containing the solid mixed powder as described in step a1), stir magnetically for 30 minutes, and mix well to obtain a mixed liquid;

[0051] a3) Put the beaker containing the mixed liquid described in step a2) into a 50°C water bath, continue to stir, and keep warm for 12 hours to obtain a viscous liquid mixed product;

[0052] a4) Mix 10ml of hydrogen peroxide with a mass fraction of 30% and 500ml of distilled water respectively, then magnetically st...

Embodiment 2

[0076] A preparation method of molybdenum oxide nanobelt / graphene composite material, comprising the steps of:

[0077] Step A: Preparation of Graphene Oxide

[0078] Graphene oxide adopts the graphene oxide prepared by embodiment 1;

[0079] Step B: Preparation of molybdenum oxide nanoribbons / graphene composites

[0080] b1) In a 50ml reaction container, measure 0.75ml of the graphene oxide dispersion prepared in step A, measure 33ml of deionized water, stir and disperse evenly, and obtain a diluted dispersion;

[0081] b2) Slowly add 6.25ml of concentrated nitric acid with a mass fraction of 65% to the diluted dispersion obtained in step b1), continue to stir and mix evenly to obtain a mixed acid solution, the concentration of nitric acid in the mixed acid solution is 2.5mol / L ;

[0082] b3) Add 2.4195g of sodium molybdate (Na 2 MoO 4 2H 2 O), stirring slowly to fully dissolve the sodium molybdate, mixing evenly to obtain a mixed reaction solution, the concentration of...

Embodiment 3

[0097] A preparation method of molybdenum oxide nanobelt / graphene composite material, comprising the steps of:

[0098] Step A: Preparation of Graphene Oxide

[0099] Graphene oxide adopts the graphene oxide prepared in embodiment 1.

[0100] Step B: Preparation of molybdenum oxide nanoribbons / graphene composites

[0101] b1) In a 50ml reaction vessel, measure 0.5ml of the graphene oxide dispersion prepared in step A, measure 33.25ml of deionized water, stir and disperse evenly to obtain a diluted dispersion;

[0102] b2) Slowly add 6.25ml of concentrated nitric acid with a mass fraction of 65% to the diluted dispersion obtained in step b1), continue to stir and mix evenly to obtain a mixed acid solution, the concentration of nitric acid in the mixed acid solution is 2.5mol / L ;

[0103] b3) Add 2.4195g of sodium molybdate (Na 2 MoO 4 2H 2 O), stirring slowly to fully dissolve the sodium molybdate, mixing evenly to obtain a mixed reaction solution, the concentration of mo...

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Abstract

The invention relates to a preparation method of one-dimensional metal molybdenum oxide nanobelt/graphene composite semiconductor material. According to the preparation method, graphene oxide and Na2MoO4.2H2O are used as raw material, and the molybdenum oxide nanobelt/graphene composite material is prepared through a one-step hydrothermal method. According to the preparation method, the technology is simple, the controllability is high, the preparation period is short, the yield is high, the cost is low, and the defects of poor repeatability and unsteady performance in traditional preparation of molybdenum oxide nanobelt/graphene composite material can be overcome. Moreover, according to the invention, the ultrasonically dispersed molybdenum oxide nanobelt/graphene composite material is spread on an interdigital electrode through a simple method, sequentially, a hydrogen-sensitive element with excellent performance is prepared, the response time of the hydrogen-sensitive element to low-concentration hydrogen of 1000ppm (0.1%, volume fraction) hydrogen at room temperature is only 10.6s, and the sensitivity of the hydrogen-sensitive element to low-concentration hydrogen of 1000ppm (0.1%, volume fraction) hydrogen at room temperature is about 95%, so that the hydrogen-sensitive element has the advantages of high sensitivity, quick response and short reply time.

Description

technical field [0001] The invention belongs to the technical field of preparation of nano-composite semiconductor materials and gas-sensing components. Specifically, the invention relates to a one-dimensional nanometer metal molybdenum oxide nanoribbon / graphene composite semiconductor material and its preparation method and the use of the material in the preparation of hydrogen Applications in sensitive components. Background technique [0002] With the rapid development of economy and society, the consumption of fossil fuels is getting faster and faster, and the resulting energy crisis and environmental pollution are becoming more and more serious. Hydrogen has attracted more and more attention and research because of its advantages of wide sources, non-polluting products and automatic regeneration. At present, hydrogen, as a protective gas and reducing ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/12B82Y30/00B82Y40/00
Inventor 顾豪爽杨树林胡永明王钊罗显涛
Owner HUBEI UNIV
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