Surface plasmon switch and manufacturing method thereof

A surface plasmon and switching technology, applied in the field of nanophotonics, can solve the problems of limited control of surface plasmon resonance, poor resonance performance of surface plasmon, polyaniline film contact, etc., and achieve good regulation and control. Ability and environmental stability, excellent performance, effect of strong extinction cross section

Inactive Publication Date: 2019-01-01
SHENZHEN RES INST THE CHINESE UNIV OF HONG KONG
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  • Application Information

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Problems solved by technology

However, the degree of control over the surface plasmon resonance is very limited due to the inability of the polyaniline film to make complete contact with the three-dimensional surface of the gold nanocrystal.
Moreover, in these studies, the gold nanocrystal arrays were obtained by electron beam etching. Compared with the surface plasmon resonance carried by chemically synthesized gold nanocrystals, the performance of surface plasmon resonance is poor, and the response ability to the change of the surrounding dielectric environment is also poor. Weaker (Nature Communications 2010,1,150)

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  • Surface plasmon switch and manufacturing method thereof

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preparation example Construction

[0040] The outstanding advantages of the preparation method of the composite nanomaterial are: the synthesis method is simple, the production efficiency is high, the core-shell nanostructure is constructed conveniently and accurately, there is no harmful solvent, and large-scale production can be carried out in practice.

[0041] In other embodiments, the method of changing the redox degree of polyaniline or changing the proton doping degree to realize the function of switching surface plasmons includes the following two methods:

[0042] (1) Introducing electrochemical means to change the redox degree of polyaniline

[0043] By controlling the concentration of the nanoparticle solution and the contact time between the solution and the substrate, the gold-polyaniline composite nanoparticle with core-shell structure can be dispersed on the surface of the electrode, which serves as the working electrode of the electrochemical reaction cell. Under different potentials, the gold-p...

Embodiment 1

[0051] 1. Preparation of polyaniline-coated gold nanorods

[0052] Dissolve 0.26mg of aniline monomer in 1.8mL, 7mmol / L sodium lauryl sulfate aqueous solution, stir at room temperature for 7 minutes, and gold nanorods (average length is 52 ± 3nm, average diameter is 111 ± 6nm) Add and disperse in the above-mentioned solution of step, the molar concentration ratio of gold nanorod and aniline monomer in this solution is 9.3×10 14 After mixing and shaking for 15 minutes, 0.75 mg of potassium persulfate was dissolved in 1.5 mL of hydrochloric acid and mixed with the above solution for 7 minutes and then reacted at room temperature for 8 hours to obtain a gold nanorod composite material coated with polyaniline. The microstructure of the composite material is as Figure 1a As shown, it can be clearly seen that polyaniline forms a uniform shell structure on the surface of gold nanorods, and the thickness of the shell is about 4 nm. After the polyaniline-coated gold nanorods go throu...

Embodiment 2

[0057] 1. Preparation of polyaniline-coated gold nanospheres

[0058] The steps are the same as the preparation steps of polyaniline-coated gold nanorods in Example 1, gold nanospheres (average diameter is 84 ± 5nm) instead of gold nanorods (average length is 52 ± 3nm, and average diameter is 111 ± 6nm), The molar concentration ratio of gold nanospheres and aniline monomer in this solution is 1.1×10 14 , the dosage of potassium persulfate was changed to 1.5 mg. The microstructure of the prepared polyaniline-coated gold nanospheres is as follows: Figure 3a-Figure 3b As shown, it can be clearly seen from the figure that the polyaniline forms a uniform shell structure on the surface of the gold nanosphere, and the thickness of the shell is about 22nm.

[0059] 2. Introduce a microfluidic device that changes the degree of proton doping

[0060] The steps of placing the polyaniline-coated gold nanospheres into the polydimethylsiloxane microfluidic chip in Example 1 are the same...

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Abstract

The surface plasmon switch and its manufacturing method based on gold-polyaniline composite nanomaterials with core-shell structure, using polyaniline with adjustable dielectric properties to endow gold nanocrystals with a controllable three-dimensional dielectric environment, by introducing Electrochemical means and changing the proton doping degree can reversibly control the dielectric properties of this three-dimensional dielectric environment, and then realize the construction of the surface plasmon resonance switch. After adjusting the dielectric properties of the polyaniline shell structure by electrochemical means, the surface plasmon switch can have the function of high-pass in the visible light band and low-transmittance in the near-infrared light band, so that it has great potential in the design and manufacture of smart windows. Great application potential. The surface plasmon switch can also be embedded in a microfluidic chip, and used as an optical switch of the microfluidic chip, which is beneficial for optical analysis of samples in the chip. A new type of gold-polyaniline composite nanomaterial with core-shell structure is used to fabricate surface plasmon switches, and its fabrication method is provided.

Description

technical field [0001] The invention relates to the field of nanophotonics, in particular to a surface plasmon switch based on a gold-polyaniline composite nanomaterial with a core-shell structure and a manufacturing method thereof. Background technique [0002] As a current research hotspot in nanophotonics, surface plasmons are quasiparticles quantized by the resonant oscillation of electrons and electromagnetic fields. It originated from the resonant oscillation generated by the mutual excitation of electron motion and electromagnetic field when free electrons in metals (or highly doped semiconductors) are excited by the electromagnetic field of incident light. It can propagate along the interface of metal thin films and dielectrics, and can also be localized to metal materials with subwavelength scales, such as gold nanocrystals. When the localized surface plasmon resonance is excited, the gold nanocrystals strongly absorb and scatter light, and generate a large localiz...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J7/04C08L79/02C08G73/02C08K3/08C25B3/12C08L83/04C08L33/12C25B3/13
Inventor 蒋妮娜阮琦锋卢文正王建方
Owner SHENZHEN RES INST THE CHINESE UNIV OF HONG KONG
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