An ultrathin film based on nano-au-enhanced Raman spectroscopy and its application in dye detection

A Raman spectroscopy, ultra-thin film technology, applied in the ultra-thin film and its application in dye detection, can solve the problems of difficult to accurately control the manufacturing process, low substrate SERS activity, poor regeneration, and poor stability, and achieve adsorption. -Desorption process, improved sensitivity, high orientation effect

Inactive Publication Date: 2016-06-01
BEIJING UNIV OF CHEM TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the manufacturing process of these methods is relatively complicated, the manufacturing process is difficult to accurately control, and the reproducibility and stability are poor, so that the SERS activity of the obtained substrate is not high.

Method used

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  • An ultrathin film based on nano-au-enhanced Raman spectroscopy and its application in dye detection
  • An ultrathin film based on nano-au-enhanced Raman spectroscopy and its application in dye detection
  • An ultrathin film based on nano-au-enhanced Raman spectroscopy and its application in dye detection

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The preparation of step A. hydrotalcite nanosheet colloidal solution: take by weighing 0.513gMg(NO 3 ) 2 ·6H 2 O, 0.375gAl(NO 3 ) 3 9H 2 O (Mg / Al=2) and 0.721g urea were dissolved in 70ml of deionized water, ultrasonically stirred to make it evenly mixed, then poured into a high-pressure reactor and reacted at 100°C for 24h, taken out, washed with deionized water, and dried to obtain carbonate plugs. layer magnesium aluminum hydrotalcite; after grinding 0.3g carbonate intercalated magnesium aluminum hydrotalcite with 0.5mol NaNO 3 and 1.5 mmol concentrated HNO 3 Mix and add to 300ml boiled deionized water, in N 2 Stirred under protection for 36h, used to remove CO 2 Centrifugal washing with deionized water for 4 times, drying, and grinding to obtain nitrate-intercalated magnesium-aluminum hydrotalcite; 0.1g of nitrate-intercalated magnesium-aluminum hydrotalcite is added in 100ml formamide, and the 2 Stir for 48h under protection, then centrifuge, discard the prec...

Embodiment 2

[0041] The preparation of step A. hydrotalcite nanosheet colloidal solution: take by weighing 0.513gMg(NO 3 ) 2 ·6H 2 O, 0.375gAl(NO 3 ) 3 9H 2 O (Mg / Al=2) and 0.721g urea were dissolved in 60ml of deionized water, ultrasonically stirred to make it evenly mixed, then poured into a high-pressure reactor and reacted at 110°C for 24h, taken out, washed with deionized water, and dried to obtain carbonate plugs. layer magnesium aluminum hydrotalcite; after grinding 0.25g carbonate intercalated magnesium aluminum hydrotalcite with 0.4mol NaNO 3 and 1.2 mmol concentrated HNO 3 Mix and add to 300ml boiled deionized water, in N 2 Stirred under protection for 36h, used to remove CO 2 Centrifugal washing with deionized water for 4 times, drying, and grinding to obtain nitrate-intercalated magnesium-aluminum hydrotalcite; 0.08g of nitrate-intercalated magnesium-aluminum hydrotalcite is added in 100ml formamide, and the 2 Stir for 48h under protection, then centrifuge, discard the ...

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Abstract

The invention discloses a nano Au enhanced Raman spectrum-based ultrathin membrane and application of membrane in dye detection, belonging to the material design field. The technical scheme is as follows: nano Au colloidal solution is firstly synthesized and then is mixed with sodium polyacrylate aqueous solution to obtain an Au@PAAS cluster; carrying out layer-by-layer self-assembly on the Au@PAAS cluster and a hydrotalcite nanosheet to obtain the nano Au ultrathin membrane material with high dispersibility and uniformity in distribution. The prepared ultrathin membrane material based on self-assembly of the Au@PAAS cluster and the hydrotalcite can be used repeatedly and is used for Raman detection. The ultrathin membrane can be used for adsorption and desorption to dyes in a multiple cyclic utilization manner, and can further gather dye molecules nearby Au nano particles. The material realizes preparation of instrumented ultrathin membrane, and the Au nano particle surface enhanced Raman scattering property can be exerted fully, so that Raman detection of the dye molecules can be achieved.

Description

technical field [0001] The invention belongs to the technical field of material design, and in particular provides an ultra-thin film based on nano-Au enhanced Raman spectrum and its application in dye detection. Background technique [0002] Raman spectroscopy is an important method for detecting the structure of substances, but its application range is limited due to its low sensitivity. In recent years, surface-enhanced Raman spectroscopy based on metal nanometers has greatly improved the detection ability of Raman spectroscopy due to its ability to obtain sample structure information and high sensitivity. Detection becomes possible, and even single-molecule detection can be achieved, which has important applications in the fields of biology, medicine, chemistry, and the environment. Commonly used materials that can be used as Raman enhancements are noble metal materials (gold, silver, copper, etc.), but because their colloids are easy to aggregate, the stability and rep...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/65
Inventor 卫敏田锐李明万罗恒段雪
Owner BEIJING UNIV OF CHEM TECH
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