Surface-enhanced Raman composite test paper

A surface-enhanced Raman and test paper technology, which is applied in the detection field, can solve the problems of lower amplification factor and poor stability of sol dispersion, and achieve the effects of improved sensitivity, high repeatability and batch-to-batch consistency, and suitable for large-scale production

Pending Publication Date: 2020-05-29
BEIJING HTNOVA DETECTION TECH CO LTD
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  • Claims
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AI Technical Summary

Problems solved by technology

The stability of the sol dispersion is poor, and after a period of time, aggregation will occur, resulting in a decrease in the amplification factor

Method used

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  • Surface-enhanced Raman composite test paper
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preparation example Construction

[0044] A preparation method for surface-enhanced Raman composite test paper, comprising the following steps:

[0045] (1) Prepare AgNPs sol and AuNPs sol according to a predetermined volume ratio;

[0046] (2) The AgNPs sol and the AuNPs sol are sequentially mixed, concentrated, and ink-formed to obtain a composite material of the AgNPs sol and the AuNPs sol;

[0047] (3) The composite material is dispersed on the carrier by printing to obtain a composite test paper;

[0048] (4) The composite test paper is post-treated to obtain a surface-enhanced Raman composite test paper.

[0049] Step (2) includes: step 2-1) mixing: mixing the AgNPs sol and the AuNPs sol obtained in step (1) to obtain a mixed sol; step 2-2) concentrating: mixing the mixed sol in a centrifuge Centrifuge in the machine until gray precipitate appears at the bottom of the centrifuge tube; Step 2-3) Inking: Keep the centrifuge tube stable, remove the liquid on the upper layer, and add the ink agent to the re...

Embodiment 1

[0056] A surface-enhanced Raman composite test paper, comprising: a carrier and a test layer uniformly laid on the surface of the carrier; the test layer is a composite material of AgNPs sol and AuNPs sol, and the volume of AgNPs sol and AuNPs sol in the composite material The ratio was 3:2 and the density of the composite material on the test layer was about 0.01 mg / mm2. The carrier is medium-speed filter paper.

[0057] Among them, AgNPs sol and AuNPs sol are prepared by conventional methods.

[0058] The preparation method of the surface-enhanced Raman composite test paper comprises the following steps:

[0059] (1) Prepare AgNPs sol and AuNPs sol according to a predetermined volume ratio;

[0060] (2) The AgNPs sol and the AuNPs sol are sequentially mixed, concentrated, and ink-formed to obtain a composite material of the AgNPs sol and the AuNPs sol;

[0061] Step (2) includes: step 21) mixing: mixing the AgNPs sol and the AuNPs sol obtained in step (1) in a volume rati...

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Abstract

The invention discloses surface-enhanced Raman composite test paper which comprises a carrier and a test layer uniformly dispersed on the surface of the carrier, wherein the test layer is a compositematerial of AgNPs sol and AuNPs sol, and the volume ratio of the AgNPs sol to the AuNPs sol in the composite material is 1: 4-4: 1, and the average density of the composite material on the test layeris 0.001-0.05 mg / mm < 2 >. The surface-enhanced composite test paper has the material applicability of AgNPs and AuNPs simultaneously and can obviously enhance the material which can be enhanced by any one of AgNPs or AuNPs so that the convenience of surface-enhanced Raman detection is improved; the composite enhancement effect can basically reach or exceed a relatively high value of an AgNPs or AuNPs independent enhancement effect (measured by the signal-to-noise ratio under the same test condition), wherein the weighted average value is not the weighted average value of the proportions of the AgNPs and the AuNPs so that the advantage inheritance of the enhancement effect of the AgNPs and the AuNPs is realized.

Description

technical field [0001] The invention relates to the technical field of detection, in particular to a surface-enhanced Raman composite test paper. Background technique [0002] Raman spectroscopy is based on the Raman scattering effect discovered by Indian scientist C.V. Raman (Raman). It analyzes the scattering spectrum different from the frequency of the incident light to obtain molecular vibration and rotation information, and is applied to the study of molecular structure. a method of analysis. Raman spectroscopy is less affected by water, has a large spectral range, and can analyze organic and inorganic substances. The spectral peaks are sharp and can directly correspond to chemical structures, and the detection area is small because of the use of focused laser light. This makes this analytical technique fast, simple, repeatable, and non-destructive, and is widely used in the qualitative identification of a large number of constant substances. However, when the content...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/65
CPCG01N21/658
Inventor 王辰袁丁吴红彦夏征
Owner BEIJING HTNOVA DETECTION TECH CO LTD
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