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Raman base

A Raman substrate and substrate technology, applied in Raman scattering, material excitation analysis, etc., can solve the problems of poor sensitivity, uniformity and reliability, and achieve good uniformity and reliability.

Inactive Publication Date: 2014-08-06
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the surface-enhanced Raman substrate provided by the prior art is used for Raman spectrum detection, although the detection sensitivity is improved to a certain extent, there are still problems in the detection sensitivity, uniformity and reliability of the detection using this Raman substrate. poor disadvantage

Method used

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Effect test

preparation example Construction

[0049] In the present invention, the preparation method of the Raman substrate preferably includes the following steps:

[0050] 1), combining the metal and the Raman base substrate to obtain a metal layer disposed on the Raman base substrate;

[0051] 2), combining the metal layer and the graphene film to obtain a Raman substrate.

[0052] The invention combines the metal and the Raman base substrate to obtain the metal layer arranged on the Raman base substrate. In the present invention, the Raman base substrate and metal layer are consistent with the Raman base substrate and metal layer described in the above technical solution, and will not be repeated here. In the present invention, the metal preferably includes one or more of gold, silver, platinum, copper, aluminum, lithium, sodium, titanium, potassium, nickel, palladium and gallium, more preferably includes gold, silver, copper and One or more of platinum, most preferably one or more of gold, silver and platinum, mos...

Embodiment 1

[0077] by vacuum plasma sputtering in 10 -3 Pa pressure below Depositing a gold film with a thickness of 4 nanometers on a quartz glass substrate at a rate of 100 sccm under the protection of argon gas at a flow rate, the gold film was annealed for 90 minutes in a quartz tube furnace at 350 ° C. The gold film after the annealing treatment was naturally cooled to obtain gold particles with a particle size of 20 nm deposited on the quartz glass substrate.

[0078] A graphene film is prepared at 1000° C. by chemical vapor deposition, and the graphene film is grown on a 25-micron copper foil.

[0079] Coating polymethyl methacrylate on the prepared graphene film, drying in a vacuum drying oven at 170° C. for 30 minutes to obtain the first intermediate layer; The ammonium persulfate solution of / mL removes the copper foil in the first intermediate layer to obtain the second intermediate layer, and rinses the first intermediate layer with deionized water in the process of removin...

Embodiment 2

[0086] Measure 0.25mL, 0.1mol / L gold chloride aqueous solution and 100mL ultrapure water, mix, stir and heat to boiling, add 1.5mL, mass concentration of 1% trisodium citrate aqueous solution to the obtained solution for 30 minutes reaction to obtain gold sol.

[0087] Under ultrasonic conditions, the quartz glass substrate is cleaned with acetone, ethanol, and ultrapure water in sequence, and the cleaned quartz glass substrate is heat-treated at 80°C for 30 minutes with a sulfuric acid aqueous solution with a volume concentration of 75%; The heat-treated quartz glass substrate was cleaned with ultrapure water, dried in air, and set aside.

[0088] The above-mentioned heat-treated quartz glass substrate was soaked in an ethanol solution with a volume concentration of 1% of 3-aminopropyltriethoxysilane at 25°C for 2h, and the obtained 3-aminopropyltriethoxysilane The substrates were washed with ethanol and ultrapure water, dried in air, and used for later use.

[0089] Soak t...

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Abstract

The invention provides a Raman base which comprises a Raman base substrate, a metal layer arranged on the Raman base substrate, and a graphene film arranged on the metal layer. According to the Raman base, the graphene film is compounded with the metal layer, and the graphene film has an atomic-scale thickness, and is capable of effectively enhancing the strength of an electric field and amplifying a Raman signal, so that when the Raman base provided by the invention is used for Raman detection, the sensitivity, the uniformity and the reliability of the Raman detection are preferable. Experiment results indicate that the Raman base provided by the invention is used for Raman detection, an object to be detected with a mol concentration of 10<-4> mol / L-10<-9> mol / L is detected, the detected spatial discrimination Raman diagram color of the object to be detected is uniform, and the detected Raman spectrum is displayed to be consistent with a Raman signal.

Description

technical field [0001] The invention relates to the technical field of Raman detection, in particular to a Raman substrate. Background technique [0002] As a fingerprint spectrum that characterizes the vibrational energy level of molecules, Raman spectroscopy can give detailed structural information such as characteristic groups, stacking methods, and doping of the molecules to be tested. It is manifested in: the frequency shift of Raman spectrum detection is not limited by the frequency of the monochromatic light source; the directionality of the Raman spectrum detection laser is very strong, and the emission angle of the beam is small, which can detect trace samples; the Raman spectrum detection can be Use samples in which the solvent is water. The many advantages of Raman spectroscopy make it widely used in the fields of physics, chemistry, biology and materials. [0003] Although Raman spectroscopy can detect trace samples, the Raman signal is weak during detection, r...

Claims

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Application Information

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IPC IPC(8): G01N21/65
Inventor 朱彦武赵元杜袁鑫
Owner UNIV OF SCI & TECH OF CHINA
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