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Method for carrying out surface-enhanced infrared absorption spectroscopy (SEIRAS) detection by adopting nanoscale aluminium-doped zinc oxide (AZO) as substrate

An aluminum-doped zinc oxide, nano-scale technology, applied in the measurement of color/spectral characteristics, etc., can solve the problems of weak response, inter-band and in-band loss, low infrared absorption and utilization efficiency, etc., to improve the enhancement ability and widen the range. Effect

Active Publication Date: 2017-06-20
JILIN UNIV
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] There are certain defects in using traditional silver and gold nano-films as SEIRAS substrates: on the one hand, due to the band structure conditions of silver and gold and the high carrier concentration, electron transfer between bands and within bands is very easy, making their On the other hand, due to the weak response of the imaginary part of the dielectric constant of silver and gold in the infrared band, the efficiency of infrared absorption and utilization is quite low.
It can be seen that the defects of zinc oxide are more complex

Method used

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  • Method for carrying out surface-enhanced infrared absorption spectroscopy (SEIRAS) detection by adopting nanoscale aluminium-doped zinc oxide (AZO) as substrate
  • Method for carrying out surface-enhanced infrared absorption spectroscopy (SEIRAS) detection by adopting nanoscale aluminium-doped zinc oxide (AZO) as substrate
  • Method for carrying out surface-enhanced infrared absorption spectroscopy (SEIRAS) detection by adopting nanoscale aluminium-doped zinc oxide (AZO) as substrate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Preparation, surface modification and SEIRAS detection of AZO nanoparticle sol with a mole fraction of 7%.

[0045] 1. Preparation of AZO nanoparticle sol:

[0046] (1) Measure 60 mL of deionized water into the beaker with a graduated cylinder, then weigh 40 mg of zinc oxide powder and a certain mass of aluminum isopropoxide (the mole fraction accounts for 7% of the zinc oxide) with a balance, and mix the two into the beaker .

[0047] (2) It was magnetically stirred for 6 hours. Then the resultant was filtered, washed three times with ethanol and deionized water successively, dried, and ground for 8 minutes with an agate mortar.

[0048] (3) Finally, heat treatment was carried out at 900° C. in an air atmosphere in a muffle furnace for 3 hours, and cooled to room temperature with the furnace to obtain 0.065 g of AZO nanoparticle powder. Further, the obtained AZO nanoparticle powder was dissolved in 130 mL of deionized water to obtain an AZO nanoparticle sol with a c...

Embodiment 2

[0054] Preparation, surface modification and SEIRAS detection of AZO nanoparticles with a mole fraction of 7%.

[0055]1. Preparation of AZO nanoparticles:

[0056] (1) Measure 40mL of ethylene glycol with a graduated cylinder, add it to a beaker, weigh 40mg of zinc nitrate hexahydrate and aluminum nitrate nonahydrate with a mole fraction of 7% of zinc nitrate hexahydrate with a balance, add it to the beaker for dissolution, and obtain solution A .

[0057] (2) Weigh 10 mg of sodium hydroxide solid with a balance, and dissolve it in 10 mL of deionized water. Then, add sodium hydroxide solution to solution A and mix well.

[0058] (3) Transfer the solution in the beaker to a 50 mL polytetrafluoroethylene-lined reaction kettle, put it into a constant temperature oven, and react at 160° C. for 24 hours. Thereafter, the reactor was taken out and cooled to room temperature.

[0059] (4) The reaction kettle was opened, the product was centrifuged, and the precipitate was washed ...

Embodiment 3

[0065] Preparation, surface modification and SEIRAS detection of AZO nanoparticle sol with a mole fraction of 7%.

[0066] 1. Preparation of AZO nanoparticle sol:

[0067] Method is with embodiment 1.

[0068] 2. Surface modification of probe molecules:

[0069] Add 0.01 g of the prepared AZO nanoparticle powder into 10 mL of 10 -6 mol / L ethanol solution of p-mercaptobenzoic acid (MBA), stirred vigorously, and reacted in the dark at room temperature for 6 hours; the product was centrifuged, washed with ethanol and centrifuged three times to remove unadsorbed probe molecules to obtain surface modified AZO nanoparticle powder with probe molecules.

[0070] 3. SEIRAS test of surface-modified AZO nanoparticles:

[0071] The AZO nanoparticles prepared above are used as the SEIRAS substrate, and the monomolecular layer p-mercaptobenzoic acid (MBA) probe molecules adsorbed on its surface are detected by SEIRAS, and the potassium bromide tableting method is used for testing, and t...

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Abstract

The invention relates to a method for carrying out surface-enhanced infrared absorption spectroscopy (SEIRAS) detection by adopting nanoscale aluminium-doped zinc oxide (AZO) as a substrate, belonging to the technical fields of nano materials and detection. The invention in particular relates to a new method for carrying out the SEIRAS detection on probe molecules within a mid-infrared spectroscopy fingerprint region range of 1300-600 cm<-1> by adopting the nanoscale AZO as the substrate. The method comprises the three steps of synthesizing an aluminium-doped AZO nano-material, carrying out surface modification on the probe molecules, and carrying out the SEIRAS detection on the probe molecules by taking the AZO nano-material as the novel SEIRAS substrate. By using the enhanced substrate, SEIRAS signals adsorbed to the surface of the AZO nano-material are detected to be significantly enhanced compared with infrared signals of the probe molecule bodies, and the enhancement factor can reach 103. After the method is adopted, more information about the structures and interaction of a material surface and probe molecules can be obtained, and theoretical and experimental basis for studying the mechanism of an SEIRAS effect is provided; furthermore, a foundation is laid for the developing the SEIRAS effect as a universal characterization tool for the material surfaces.

Description

technical field [0001] The invention belongs to the technical field of nanomaterials and detection, and specifically relates to a nanoscale aluminum-doped zinc oxide (AZO) material as a substrate, which is 1300-600cm long in the mid-infrared spectrum fingerprint area. -1 A new method for surface-enhanced infrared absorption spectroscopy (SEIRAS) detection of probe molecules. Background technique [0002] Infrared Spectroscopy (IR) is an absorption spectrum. A beam of infrared rays of different wavelengths is irradiated on the molecules of the substance, and infrared rays of certain wavelengths are absorbed to form the infrared absorption spectrum of the molecule. Each molecule has a unique infrared absorption spectrum determined by its composition and structure, based on which the molecular structure can be analyzed and identified. The infrared characteristic signals of most organic chemical molecules and biomolecules are concentrated in the mid-infrared region, but the si...

Claims

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Application Information

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IPC IPC(8): G01N21/35
CPCG01N21/35
Inventor 阮伟东李倩文周铁莉李亚丽张传泽韩晓霞宋薇王旭赵冰
Owner JILIN UNIV
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