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Method for preparing self-cleaning type surface raman-enhanced substrate

A surface Raman-enhanced and self-cleaning technology, used in Raman scattering, chemical instruments and methods, liquid chemical plating, etc., can solve the problems of great influence on the performance of nanomaterials, and achieve self-cleaning and excellent photocatalytic degradation. The effect of performance and preparation process is simple

Active Publication Date: 2015-02-18
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, some studies have combined Ag / AgCl and rGO to obtain a new type of photocatalyst Ag / AgCl / rGO. However, the Ag / AgCl particle size is large (about 400 nm) and the particle size distribution is wide, while the size and size of nanomaterials and The particle size distribution has a great influence on its performance, and there are few reports on the SERS performance of such ternary composites

Method used

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  • Method for preparing self-cleaning type surface raman-enhanced substrate
  • Method for preparing self-cleaning type surface raman-enhanced substrate
  • Method for preparing self-cleaning type surface raman-enhanced substrate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Example 1 mainly investigates the effect of the amount of PDDA on the structure and morphology of the AgAgCl complex.

[0028] Add 150mg-1000mg PDDA dropwise to 20 mL silver nitrate aqueous solution (0.02 mol / L), and stir magnetically for 10 min at room temperature to obtain Ag + / PDDA suspension.

[0029] Add 20 mL NaCl aqueous solution (0.02 mol / L) and 60 mL C 6 h 12 o 6 The aqueous solution (0.84mmol / L) was added to the above four suspensions respectively, and the milky white AgCl sol was obtained after magnetic stirring for 60 min.

[0030] Finally, 100 mL of the above colloidal solution was transferred into an autoclave, kept at 180 °C for 24 h, cooled naturally, and finally centrifuged and washed three times with water, twice with alcohol, and once with acetone, and then dissolved in 20 mL of water. Obtain AgAgCl sol.

[0031] figure 1 (a-c) are the SEM images of AgAgCl sols prepared with 150 mg, 500 mg and 1000 mg of PDDA, respectively. It can be seen from...

Embodiment 2

[0033] Example 2 mainly investigates the effect of hydrothermal reaction time on the structure and morphology of AgAgCl composite powder.

[0034] Add 500 mg of PDDA dropwise to 20 mL of silver nitrate aqueous solution (0.02 mol / L), and magnetically stir at room temperature for 10 min to obtain Ag + / PDDA suspension.

[0035] Add 20 mL NaCl aqueous solution (0.02 mol / L) and 60 mL C 6 h 12 o 6 Aqueous solution (0.84 mmol / L) was added to the above suspension, and a milky white AgCl sol was obtained after magnetic stirring for 60 min.

[0036]Finally, transfer 100 mL of the above colloidal solution into an autoclave, under hydrothermal conditions, hydrothermally react at 180 °C for 12 h, 24 h, and 36 h, then cool naturally, and finally centrifuge and wash 3 times with water, wash with alcohol twice, and wash with acetone 1 time, and then dissolved in 20 mL of water to obtain three groups of AgAgCl sols.

[0037] figure 2 (a-c) are SEM pictures of hydrothermal reaction tim...

Embodiment 3

[0040] First prepare GO into a suspended aqueous solution with a concentration of 0.1 mg / mL and ultrasonically disperse until uniformly dispersed, then mix 10 mL of the AgAgCl sol prepared by hydroheating for 24 h in Example 2 with 10 mL of GO aqueous solution, and ultrasonically disperse for 2 h before processing Soak the glass substrate in the above mixed solution, take it out after 30min, blow dry and soak again, repeat the above steps 4 times in this way, and make the AgAgCl / GO composite thin film.

[0041] image 3 (a) is the SEM image of the AgAgCl / GO composite film; we know that the oxygen-containing groups on the GO sheet are negatively charged, and the AgAgCl sol prepared by the hydrothermal reaction is positively charged due to the addition of PDDA, thus ensuring that the two can Composite and deposited on the glass substrate by electrostatic self-assembly, the obvious film-like wrinkled morphology of GO can be clearly seen from the figure, the AgAgCl nanoparticles a...

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Abstract

The invention belongs to the technical field of inorganic functional materials, and discloses a method for preparing a Ag@AgCl / GO self-cleaning type surface raman-enhanced substrate. According to the method, silver nitrate serves as a precursor, PDDA serves as a modification reagent, C6H12O6 serves as a reducing agent, and hydrothermal reaction is performed to prepare Ag@AgCl sol; a Ag@AgCl / GO composite thin film is obtained through self-assembling and adsorbing Ag@AgCl nano particles with positive charges by using the fact GO carries negative charges, and has a high adsorption function and a temperature effect, and the Ag@AgCl / GO composite thin film is applied to the self-cleaning type surface raman-enhanced substrate. Compared with a conventional raman-enhanced substrate, the self-cleaning type surface raman-enhanced substrate has an excellent SERS (surface enhanced raman scattering) property, that a substrate material is recycled for multiple times is realized due to the excellent photocatalytic degradation performance, so that the self-cleaning type surface raman-enhanced substrate has a wide actual application prospect.

Description

technical field [0001] The invention belongs to the technical field of inorganic functional materials, in particular to a method for preparing an AgAgCl / GO self-cleaning surface Raman enhanced substrate, using silver nitrate as a precursor, PDDA as a modification reagent, C 6 h 12 o 6 As a reducing agent, AgAgCl sol was prepared by hydrothermal reaction; GO was used as a template, and the strong adsorption function and template function of GO were used to adsorb AgAgCl nanoparticles through electrostatic self-assembly to obtain a self-cleaning Raman-enhanced substrate. Background technique [0002] Graphene oxide (GO) and graphene (GE) have high mechanical strength, large specific surface area, convenient surface treatment and low preparation cost, making them potential carriers of nanoparticles; due to GE's special electron, Optical, high physical and chemical stability and other properties make this kind of composite exhibit many excellent properties and potential applic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C18/44B01J27/10G01N21/65
CPCB01J27/10C23C18/44G01N21/65
Inventor 马双彪杨娟潘红飞赵南周亚洲傅小齐
Owner JIANGSU UNIV
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