Preparation method of AgNWs (at) LiG (at) PDMS sandwich structure flexible SERS substrate

A sandwich and flexible technology, used in cable/conductor manufacturing, electrical components, circuits, etc., to achieve the effects of controllable morphology and structure, good conductivity and uniform dispersion

Pending Publication Date: 2022-05-27
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the "sticky" property of PDMS alone is not enough to prevent the modified metal nanoparticles from being damaged or peeled off

Method used

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  • Preparation method of AgNWs (at) LiG (at) PDMS sandwich structure flexible SERS substrate
  • Preparation method of AgNWs (at) LiG (at) PDMS sandwich structure flexible SERS substrate
  • Preparation method of AgNWs (at) LiG (at) PDMS sandwich structure flexible SERS substrate

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Embodiment 1

[0029] Set the parameters of the carbon dioxide laser as the laser emission power is 10%, the scanning frequency is 120KHZ, the scanning speed is 30mm / s, and the scanning thickness of the PI film is 100μm. C4D presets the rectangular shape with a size of 1.5cm*0.5cm to prepare a laser-induced Graphene, its scanning electron microscope picture is shown in figure 1 shown. Drop about 1mL of a mixture containing PDMS and curing agent (PDMS:curing agent=10:1w / w) on the surface of LiG and spread it on the surface of LiG, place the sample in a polytetrafluoroethylene container, put it in a vacuum oven, After repeating the debubbling operation about 6 times, it was transferred to a high-temperature oven at 130°C for curing for 1 hour, and the PI film was torn off, leaving the LiG@PDMS flexible SERS substrate with the PI film removed. Select AgNWS with a diameter of 25nm and a length of 25μm, disperse it in isopropanone suspension to prepare a solution with a concentration of 3mg / ml, ...

Embodiment 2

[0031] Set the parameters of the carbon dioxide laser as the laser emission power is 10%, the scanning frequency is 120KHZ, the scanning speed is 30mm / s, and the scanning thickness of the PI film is 100μm. C4D presets the rectangular shape with a size of 1.5cm*0.5cm to prepare a laser-induced Graphene, its scanning electron microscope picture is shown in figure 1 shown. Drop about 1mL of a mixture containing PDMS and curing agent (PDMS:curing agent=10:1w / w) on the surface of LiG and spread it on the surface of LiG, place the sample in a polytetrafluoroethylene container, put it in a vacuum oven, After repeating the debubbling operation about 6 times, it was transferred to a high-temperature oven at 130°C for curing for 1 hour, and the PI film was torn off, leaving the LiG@PDMS flexible SERS substrate with the PI film removed. Select AgNWS with a diameter of 25 nm and a length of 25 μm, disperse it in isopropanone suspension to prepare a solution with a concentration of 3 mg / m...

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Abstract

The invention discloses a preparation method of an AgNWs (at) LiG (at) PDMS sandwich structure flexible SERS (Surface Enhanced Raman Scattering) substrate, which is characterized by comprising the following steps: preparing laser-induced graphene (LiG) by adopting a carbon dioxide laser, then completely transferring the LiG to a PDMS flexible substrate by adopting a PDMS transfer strategy to obtain a LiG (at) PDMS double-layer structure, spin-coating silver nanowires (AgNWs) on the surface of the LiG (at) PDMS double-layer structure, and finally preparing the AgNWs (at) LiG (at) PDMS sandwich structure flexible SERS substrate. The AgNWs / LiG PDMS sandwich structure flexible surface enhanced Raman spectroscopy (SERS) substrate has the advantages that the PDMS provides the flexible substrate and is good in tensile property, but the surface of the hydrophobic PDMS is directly coated with the AgNWS, the Ag nanowire is easy to fall off, the LiG layer is added, on one hand, the deposition and stability of the AgNWS are facilitated, on the other hand, on the other hand, the surface of the PDMS is coated with the AgNWS, and on the other hand, the surface of the PDMS is coated with the AgNWS. On the other hand, the good conductivity of LiG is beneficial to enhancing the SERS performance of the Ag nanowire.

Description

technical field [0001] The invention relates to the field of preparation of surface-enhanced Raman scattering active substrates, in particular to the preparation of a AgNWs@LiG@PDMS sandwich structure flexible SERS substrate. Background technique [0002] Surface-enhanced Raman spectroscopy (SERS) is considered to be one of the most promising and versatile analytical tools because it is a non-destructive, fast and ultrasensitive technique that allows real-time analysis and provides molecular information. Over the past few decades, SERS has been widely used in environmental monitoring, food safety and forensics. According to the SERS enhancement mechanism, silver is considered as the best SERS material with strong signal response. In addition, fabricating a suitable silver-based SERS substrate is a key factor to improve the SERS performance. In most cases, silicon and glass flakes are chosen as solid supports for various Ag nanostructures; however, their rigid and brittle c...

Claims

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Application Information

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IPC IPC(8): H01B13/00
CPCH01B13/0036
Inventor 程琳钱矜辰魏正帅邵佺陈冠政姜兆辉方姜美刘爱萍
Owner ZHEJIANG SCI-TECH UNIV
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