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Formaldehyde-sensitive material CdGa2O4 with ultrahigh sensitivity and selectivity and preparation method thereof

A sensitive material and sensitive technology, applied in material resistance, material analysis, material analysis by electromagnetic means, etc., can solve the problems of high sensitivity and selective detection that have not yet been recognized, and achieve efficient formaldehyde molecular adsorption and diffusion channels, Increase the effect of adsorption and short preparation cycle

Inactive Publication Date: 2017-09-15
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, spinel structures (such as MFe 2 o 4 ,MCo 2 o 4 , MCr 2 o 4 , MGa 2 o 4 etc.) Composite metal compounds show great promise in detecting harmful gases (Sens.Actuators B, 2016, 222, 95~105), but CdGa 2 o 4 As a typical gallium spinel material, it has not been known that it can be used for highly sensitive and selective detection of low-concentration formaldehyde

Method used

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  • Formaldehyde-sensitive material CdGa2O4 with ultrahigh sensitivity and selectivity and preparation method thereof
  • Formaldehyde-sensitive material CdGa2O4 with ultrahigh sensitivity and selectivity and preparation method thereof
  • Formaldehyde-sensitive material CdGa2O4 with ultrahigh sensitivity and selectivity and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Example 1: CdGa 2 o 4 Preparation of Porous Nanofibrous Materials

[0024] 0.063g Cd(NO 3 ) 2 4H 2 O (0.206mmol) and 0.172g Ga (NO 3 ) 3 9H 2 O (0.412mmol) was sequentially added to 6.6g ethanol and 2.2g DMF mixed solvent, stirred at room temperature until completely dissolved, and it was a colorless transparent solution. Under stirring, 0.8 g of polyvinylpyrrolidone (PVP) was added, and stirred at room temperature for 12 hours to obtain a uniform solution. Pour the solution into a 5mL syringe, the inner diameter of the needle is 0.41mm, and the aluminum foil is used as the cathode receiving plate to collect the nanofiber product. The distance between the aluminum foil and the two pole plates of the needle is 20cm, the applied voltage is 22kV, the temperature is 25°C, and the humidity is 20%. , followed by electrospinning, and nanofiber precursors were obtained on the receiving plate after 24 h. The nanofiber precursor was dried at 70°C for 24h, and the obtaine...

Embodiment 2

[0026] Example 2: CdGa 2 o 4 Manufacture of material gas sensor

[0027] The main body of the gas sensor is a corundum ceramic tube with a diameter of 1mm and a length of 4mm. There are Au electrodes on both sides of the outer surface of the ceramic tube, and two platinum wires are connected to each Au electrode as a wire. The die is a nickel-chromium alloy heating wire, which is used to heat the device to provide operating temperature. The manufacture method of the gas sensor is as follows: (1) take an appropriate amount of CdGa 2 o 4 Sensitive materials are placed in a clean agate mortar, a small amount of ethanol is added dropwise and then vigorously ground for 5 minutes to prepare a thick slurry. (2) Apply the above-mentioned slurry evenly on the outer surface of the corundum ceramic tube with a sensitive brush, and completely cover the gold electrode, and dry it at room temperature for later use; CdGa 2 o 4 The thickness of the sensitive film is about 0.1mm. (3) In...

Embodiment 3

[0028] Example 3: CdGa 2 o 4 Gas Sensitive Properties Test of Gas Sensors

[0029] The gas-sensing property of the material is evaluated by making the material into a gas-sensing device with a CGS-8 intelligent gas-sensing analysis system (Beijing Elite Technology Co., Ltd.). The system is a static analysis system consisting of three parts: gas box, gas box base and main engine. The actual test is carried out with a self-provided 2.5-liter gas cylinder. First, under the experimental environmental conditions (relative humidity 20%, room temperature 20°C), the device has a resistance after it reaches stability in the air, which is denoted as R a , and then use a syringe or a micro-sampler to measure a certain amount of the gas to be tested and inject it into the test gas cylinder. After a certain period of time, after the gas is completely mixed, put the device into the test bottle. At this time, the resistance of the device will vary due to the material The interaction with ...

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Abstract

The invention relates to a formaldehyde-sensitive material CdGa2O4 nano fibers with ultrahigh sensitivity and selectivity and a preparation method thereof and belongs to the field of inorganic functional materials. The preparation method includes: using Cd salt and Ga salt as the precursors, dissolving the precursors into a mixed solvent of ethanol and N, N-dimethyl formamide, using polyvinyl pyrrolidone to regulate the viscosity of the solution, and using the electrostatic spinning technology to prepare the nano fibers. The formaldehyde-sensitive material CdGa2O4 nano fibers and the preparation method thereof have the advantages that the fibers are modified by a small amount of CdO nano particles in a phase separation manner, so that part of Ga<3+> in CdGa2O4 spinel replaces tetrahedral interstice Cd<2+> to generate free electrons, oxygen adsorption of the nano fibers is increased favorably, and the formaldehyde sensitivity of the nano fibers is increased; the nano fibers have extremely high sensitivity (100ppm, S=60.0) to formaldehyde under low operation temperature (110 DEG C), the nano fibers have extremely high selectivity to other volatile organic compounds such as methanol, ethanol, acetone and benzene, and the lowest formaldehyde detection limit (33ppb) of the nano fibers is lower than national standards.

Description

technical field [0001] The invention belongs to the technical field of inorganic functional materials, in particular to a formaldehyde-sensitive material CdGa with ultra-high sensitivity and selectivity 2 o 4 Porous nanofibers and methods for their preparation using electrospinning technology. Background technique [0002] Formaldehyde, as the primary gaseous pollutant in indoor air, has reproductive toxicity and carcinogenic effects, which seriously threatens human health. The detection of formaldehyde, especially the high-sensitivity and selective detection of low-concentration formaldehyde has attracted widespread attention. my country's "Code for Indoor Environmental Pollution Control of Civil Building Engineering" (GB50325-2010) stipulates that the indoor formaldehyde concentration of civil buildings should be lower than 0.08mg / m 3 (about 60ppb). Various types of semiconductor metal oxides with different nanostructures (such as ZnO, SnO 2 , In 2 o 3 etc.) are dev...

Claims

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Application Information

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IPC IPC(8): D01F9/08G01N27/12
CPCD01F9/08G01N27/126G01N27/127
Inventor 邹晓新陈辉李国栋
Owner JILIN UNIV
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