Low concentration detection SERS (Surface Enhanced Raman Scattering) substrate of PMMA spaced gold nanocube and gold film composite structure

A composite structure and cube technology, which is applied in measuring devices, instruments, and material analysis through optical means, can solve the problems of small electric field enhancement, single structure, complex preparation process, etc., and achieve the effect of high electric field enhancement

Pending Publication Date: 2019-04-30
LANZHOU UNIVERSITY OF TECHNOLOGY
View PDF0 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] (1) SERS substrate with a single structure: the structure is single, the electric field enhancement is small, and the surface plasmons excited by the metal micro-nano structure are used to enhance the electric field, which can only excite local surface plasmons. The SERS intensity is limited, and lower concentration cannot be performed. Analyte Detection
[0004] (2) SERS substrate with composite structure: complex preparation process and high cost

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Low concentration detection SERS (Surface Enhanced Raman Scattering) substrate of PMMA spaced gold nanocube and gold film composite structure
  • Low concentration detection SERS (Surface Enhanced Raman Scattering) substrate of PMMA spaced gold nanocube and gold film composite structure
  • Low concentration detection SERS (Surface Enhanced Raman Scattering) substrate of PMMA spaced gold nanocube and gold film composite structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] refer to figure 1 The shown composite structure of gold nanocubes and gold film separated by PMMA is a low-concentration detection SERS substrate, including a glass substrate 1 , a titanium film 2 , a gold film 3 , a PMMA film 4 , gold nanocubes 5 and an analyte 6 .

[0029] The glass substrate 1 is made of silicon dioxide fused silica material with a thickness of about 1mm.

[0030] A titanium thin film 2 with a thickness of 5 nm is prepared on the glass substrate 1 by magnetron sputtering.

[0031] A gold thin film 3 with a thickness of 50 nm is prepared on the titanium thin film 2 by magnetron sputtering.

[0032] PMMA thin film 4 with a thickness of 30 nm was prepared on gold thin film 3 in 1% PMMA anisole solution at 2000 rpm for 60 s.

[0033] Gold nanocube 5 is prepared by chemical synthesis. In aqueous solution, the average size of gold nanocube is 170nm, the concentration is 50μg / mL, and it is diluted to 6.25μg / mL with deionized water.

[0034] The analyte 6...

Embodiment 2

[0038] Prepare a concentration of 10 -11 M of R6G aqueous solution, and 30 μL was added to 270 μL of gold nanocube aqueous solution with a concentration of 6.25 μg / mL to obtain 10 -12 M's R6G, 5.625 μg / mL gold nanocube mixed aqueous solution. After drying naturally, a composite structure of gold nanocubes and gold film with PMMA intervals adsorbed on the analyte 6 was obtained. The measured SERS spectra are shown in image 3 shown. Others are with embodiment 1.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
sizeaaaaaaaaaa
concentrationaaaaaaaaaa
Login to view more

Abstract

The invention discloses a low concentration detection SERS (Surface Enhanced Raman Scattering) substrate of a PMMA spaced gold nanocube and gold film composite structure, which sequentially comprisesa glass substrate, a titanium film, a gold film, a PMMA film, gold nanocubes and a to-be-detected object adsorbed on the surfaces of the PMMA film and the gold nanocubes. When TM polarized light is normally incident on the surface of the PMMA spaced gold nanocube and gold film composite structure, local surface plasmas and propagation surface plasma are excited, strong resonance coupling occurs between the two kinds of surface plasmas to result in very strong electric field enhancement, and thus a strong surface enhanced Raman scattering (SERS) spectrum is generated for low-concentration SERSdetection. The low concentration detection SERS substrate has the advantages of easy operation, low cost and high sensitivity, and can be widely applied to low concentration detection.

Description

technical field [0001] The invention belongs to the field of surface-enhanced Raman scattering substrates, and relates to the surface-enhanced Raman scattering (SERS) spectrum of gold nanocubes and gold film composite structures using PMMA intervals, and the technical field of using SERS to measure low concentrations, in particular to PMMA intervals. Surface-enhanced Raman scattering substrate of gold nanocube and gold film composite structure. Background technique [0002] Surface-enhanced Raman scattering overcomes the disadvantage of low sensitivity of ordinary Raman spectroscopy, and can obtain information that cannot be obtained by conventional Raman spectroscopy. SERS originates from the local electromagnetic field caused by surface plasmon resonance, so the electric field enhancement of micro-nano structures has been widely used in the field of SERS. At present, SERS substrates mainly include single-structure SERS substrates formed by metal nanoparticles of different...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/65G01N21/01
CPCG01N21/658G01N21/01
Inventor 王向贤朱剑凯白雪琳吴渊庞志远童欢吴枭雄杨华
Owner LANZHOU UNIVERSITY OF TECHNOLOGY
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap