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Conductive MOF (Metal Organic Framework) modified gas sensitive material as well as preparation method and application thereof

A gas-sensing material, MOF technology, applied in the field of conductive MOF-modified gas-sensing materials and its preparation, can solve the problems of hindering gas detection requirements, difficult to achieve trace rapid detection and analysis of gases, etc., to facilitate gas adsorption and improve detection sensitivity , to overcome the effect of self-aggregation

Pending Publication Date: 2022-07-22
杭州汇馨传感技术有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the reported gas sensors composed of a single MOF material are basically in ppm (10 -6 ) level to detect different gases (Chem.Commun., 2018, 54, 7873--7891), which hinders the gas detection requirements at a lower level that they need to achieve in practical applications
Ming-ShuiYao et al. used Cu 3 (HHTP) 2 Detect NH at 100ppm 3 , its response and recovery time are 1.36min and 9.11min (Angew.Chem.2017, 129, 16737-16741), which shows that a single conductive MOF material may be difficult to achieve the goal of rapid detection and analysis of trace gas

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  • Conductive MOF (Metal Organic Framework) modified gas sensitive material as well as preparation method and application thereof
  • Conductive MOF (Metal Organic Framework) modified gas sensitive material as well as preparation method and application thereof
  • Conductive MOF (Metal Organic Framework) modified gas sensitive material as well as preparation method and application thereof

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preparation example Construction

[0049] The embodiment of the present invention provides the aforementioned preparation method of a conductive MOF modified gas sensing material, comprising the following steps:

[0050] In the liquid phase, a polycationic electrolyte such as polydiallyldimethylammonium chloride is initially assembled with negatively charged graphene oxide, and then a conductive metal-organic framework material is introduced for surface modification treatment to obtain conductive MOF modification. Gas sensitive material.

[0051] Further, the present invention provides a gas sensing chip, which is prepared by combining the aforementioned conductive MOF modified gas sensing material with an electrode.

[0052] In the embodiment of the present invention, through a step-by-step assembly strategy, the polycation electrolyte PDDA and the negatively charged graphene oxide are initially assembled in the liquid phase, and then the conductive metal-organic framework material is introduced for further su...

Embodiment 1

[0091] This embodiment mainly provides graphene oxide / PDDA / Co with different PDDA contents 3 (HITP) 2 The preparation method of the gas-sensitive material and the selection of the optimal PDDA content, the specific steps are as follows:

[0092] Step 1, Preparation of Graphene Oxide / PDDA / Co 3 (HITP) 2Self-assembly suspension: 10μL, 20μL, 30μL, 40μL, 60μL PDDA (Mw.200-350kDa, 1%Wt.) were added to 0.5mL graphene oxide solution (0.5mg / mL), respectively, after shaking evenly , add 0.5mL Co 3 (HITP) 2 (0.5mg / mL) suspension was shaken on a shaker overnight, then centrifuged and washed 3 times with deionized water, and redispersed with an equal volume of deionized water to obtain graphene oxide / PDDA / Co, respectively 3 (HITP) 2 Self-assembled suspension.

[0093] Step 2: Preparation of graphene oxide / PDDA / Co with different PDDA contents 3 (HITP) 2 Gas sensor chip: The ITO-PET interdigital electrode was confined with PDMS film, and the electrode was treated with oxygen plasma ...

Embodiment 2

[0096] This embodiment mainly provides a graphene oxide / PDDA / Co 3 (HITP) 2 The preparation method of gas sensitive material, its specific steps are as follows:

[0097] Step 1, Preparation of Graphene Oxide / PDDA / Co 3 (HITP) 2 Self-assembled suspension: add 20 μL PDDA (Mw. 200-350 kDa, 1% Wt.) to 0.5 mL graphene oxide solution (0.5 mg / mL), shake evenly, add 0.5 mL Co 3 (HITP) 2 (0.5mg / mL) suspension was shaken on a shaker overnight, then centrifuged and washed with deionized water 3 times, and redispersed with an equal volume of deionized water to obtain graphene oxide / PDDA / Co 3 (HITP) 2 Self-assembled suspension.

[0098] Step 2, Preparation of Graphene Oxide / PDDA / Co 3 (HITP) 2 Gas sensing chip: The ITO-PET interdigital electrode was confinement with PDMS film, and the electrode was treated with oxygen plasma for 30 s, and then 10 μL of PDDA-assisted graphene oxide and MOF material self-assembled suspension prepared in step 1 was added dropwise to the gas sensor chip. ...

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Abstract

The invention belongs to the technical field of sensor material preparation, and provides a conductive MOF modified gas sensitive material and a preparation method and application thereof, the conductive MOF modified gas sensitive material comprises a graphene assembly material and a conductive metal organic framework material with the surface modified by the graphene assembly material; the graphene assembly material has a two-dimensional layered structure and is obtained by assembling a polycation electrolyte and electronegative graphene oxide. The preparation method comprises the following steps: in a liquid phase, carrying out primary assembly on a polycation electrolyte such as poly (diallyldimethylammonium chloride) and negatively charged graphene oxide, and then introducing a conductive metal organic framework material to carry out surface modification treatment, thereby obtaining the composite material. The composite gas-sensitive material provided by the invention has relatively good response stability to gases with humidity in a wide range of 0-98%, can realize selective detection of trace organic and inorganic volatile compounds at room temperature, and has a good application prospect.

Description

technical field [0001] The application belongs to the technical field of sensor material preparation, and in particular relates to a conductive MOF modified gas sensing material and a preparation method and application thereof. Background technique [0002] Metal-organic frameworks (MOFs) are a new class of nanoporous crystalline materials formed by the coordination of metal cations and organic linkers. Such materials have large internal porosity, specific surface area, and excellent reversible adsorption properties. The variable pore size and surface environment can provide advantages for the selectivity and sensitivity of gas sensing. Due to the existence of polar metal centers and non-polar organic connecting parts in the structure of MOFs, the ability to selectively adsorb inorganic and organic volatile gas molecules is guaranteed. However, most 3D metal-organic framework materials are insulating materials, and it is difficult to construct commonly used chemiresistive g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/12G01N27/00A61B5/08
CPCG01N27/125G01N27/00A61B5/08
Inventor 邬建敏徐诗媛
Owner 杭州汇馨传感技术有限公司