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Nano-microsphere heptamer as well as preparation method and application thereof

A nano-microsphere and polymer technology, applied in the field of excimer Fano structure preparation, can solve the problems of complex method and difficult precision control, and achieve the effects of simple operation, large electromagnetic near-field enhancement, and easy process to achieve precise control.

Pending Publication Date: 2021-10-15
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are problems such as complex methods and difficult control of precision in preparation.

Method used

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  • Nano-microsphere heptamer as well as preparation method and application thereof
  • Nano-microsphere heptamer as well as preparation method and application thereof
  • Nano-microsphere heptamer as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Taking nano-gold heptamer as an example, a relatively dense gold nanoparticle film is first prepared:

[0048] (1), prepare the Tetramethylammonium Chloride solution of 1ml 3mol / L earlier, be that the test tube of 2ml is placed on the electronic scale, after peeling, weigh 0.3288mg anhydrous Tetramethylammonium Chloride crystallization, then Add 1ml of deionized water to dissolve fully;

[0049] (2) The silicon wafer and the glass petri dish with a diameter of 3 cm were ultrasonically cleaned in acetone, absolute ethanol, and deionized water for 180 s in order to remove surface organic solvents and other water-soluble impurities. Take out and dry. Then it was placed in a plasma cleaning machine for 90s to increase its hydrophilicity. Place the treated silicon chip at the bottom of a glass petri dish, use a pipette gun to successively take 3ml of nano-gold colloid with a particle size of 200nm, add 1ml of cyclohexane into the glass petri dish, and then take 400μL of (2...

Embodiment 2

[0054] In this embodiment, on the basis of the gold nanoparticle film obtained in Example 1, a silicon-based template with a hole structure is used to form a heptamer, specifically:

[0055] Steps (1) to (3) of this embodiment are the same as in Embodiment 1, only the pure silicon wafer is replaced by a silicon-based template with a hole structure to prepare a gold nanoparticle film.

[0056] (4) Use scotch tape to stick off excess gold nanoparticles on the surface of the silicon-based template, leaving only oligomers in the holes.

[0057] The test result of this embodiment:

[0058] Characterized by scanning electron microscopy, the resulting heptamer was as Figure 4 shown. The pore diameter of the silicon-based template is 600 nm, the period is 1 μm, and the pore depth is 200 nm. Since the position of the large-area gold nanoparticle film on the silicon-based template is uncertain, and the area with a hole structure is only 100 μm × 100 μm, the density and number of hep...

Embodiment 3

[0060] This embodiment is consistent with Embodiment 2, and only the silicon-based template with a hole structure is replaced with an AAO template with a hole structure. The specific process principle is as follows figure 1 shown.

[0061] The test result of this embodiment:

[0062] Characterized by scanning electron microscopy, the resulting heptamer was as Figure 5 shown. The pore diameter of the AAO template is 480nm, the period is 450nm, and the pore depth is 450nm. Since the hole structure of the AAO template is continuously distributed on the substrate, the heptamer formed is better than that on the silicon-based template.

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Abstract

The invention discloses a nano-microsphere heptamer as well as a preparation method and application thereof. The preparation method comprises the steps of S1, sequentially carrying out ultrasonic cleaning and plasma hydrophilic treatment on a hole template to enable the surface of the template to have hydrophilicity; S2, placing the hole template at the bottom of a culture dish, sequentially adding a nano-microsphere solution and cyclohexane, then adding a tetramethylammonium chloride solution into a water phase, adding lauryl mercaptan into an organic phase, and carrying out a self-assembly process of nano-microspheres; S3, standing and evaporating, vertically fishing out the hole template when the liquid level submerges the hole template, and drying to obtain a nano-microsphere film; and S4, removing the nano-microspheres outside the holes in the hole template to obtain the nano-microsphere heptamer. The nanogold heptamer prepared by the preparation method can generate Fano resonance, and the obtained gold nanoparticles are relatively compact, can be used for SERS detection, and have a relatively good enhancement effect on Raman signals as an SERS substrate, so that the detection limit of a target object is further reduced.

Description

technical field [0001] The invention relates to the technical field of metal plasmon Fano structure preparation, in particular to a nano-microsphere heptamer and its preparation method and application. Background technique [0002] Raman spectroscopy is a research method that collects and analyzes the inelastic scattering spectrum generated after excitation by incident light, obtains molecular vibration and other information through the frequency shift of scattered light, and applies it to molecular analysis and characterization. However, due to the extremely low efficiency of Raman scattering, most molecular signals are very weak, so there are great limitations in application. Surface Enhanced Raman Scattering (SERS) is mainly derived from the localized surface plasmon resonance properties of noble metal nanoparticles. Its appearance effectively solves the problem of weak Raman spectral signals, making SERS technology widely used in chemical Detection, biomedical detection...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J13/06G01N21/65B82Y30/00
CPCB01J13/06G01N21/658B82Y30/00
Inventor 龚天巡关芳李浩楠王桂林严博远黄文张晓升
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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