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One-dimensional Assemblies of Precious Metal Nanoparticles with Tunable Spacing and Their Applications in Nanosensors

A technology of gold nanoparticles and nanosensors, applied in the field of nanomaterials, can solve the problem that the distance between nanoparticles cannot be precisely controlled, and achieve the effect of high flexibility

Active Publication Date: 2021-06-01
SUZHOU INST OF BIOMEDICAL ENG & TECH CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] There are some problems in the above methods, the first is that the spacing between the nanoparticles cannot be precisely controlled

Method used

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  • One-dimensional Assemblies of Precious Metal Nanoparticles with Tunable Spacing and Their Applications in Nanosensors
  • One-dimensional Assemblies of Precious Metal Nanoparticles with Tunable Spacing and Their Applications in Nanosensors
  • One-dimensional Assemblies of Precious Metal Nanoparticles with Tunable Spacing and Their Applications in Nanosensors

Examples

Experimental program
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Effect test

preparation example Construction

[0066] The invention provides a one-dimensional assembly of noble metal nanoparticles with adjustable spacing, and its preparation method comprises the following steps:

[0067] 1) making nanoparticle monolayer film;

[0068] 2) Using electron beam lithography in combination with RIE etching to make the desired etching pattern on the monolayer film, and performing in-situ etching on the nanoparticles in the monolayer film by RIE etching to adjust Nanoparticle spacing.

[0069] The present invention can form a one-dimensional assembly structure of any shape by performing nanopatterning on the surface of the self-assembled monolayer film of noble metal nanoparticles, has high flexibility, and can precisely control the distance between nanoparticles, so that the one-dimensional assembly of nanoparticles can be precisely controlled optical properties. By utilizing its optical properties, it can be applied in nanosensors to realize correlation detection.

Embodiment 1

[0072] 1. Preparation of gold nanoparticle monolayer film:

[0073] 1-1) Spread a layer of n-hexane with a thickness of 5 mm on the surface of the gold nanoparticle solution;

[0074] 1-2) Slowly add 3.0mL of ethanol solution to it, and gradually form a layer of reflective golden film;

[0075] 1-3) Stand still until the n-hexane is completely volatilized, insert the cleaned glass sheet vertically, pick up the nanoparticle film, and dry it naturally to obtain a gold nanoparticle monolayer film attached to the glass sheet.

[0076] refer to figure 1 , is a preparation method and effect diagram of a gold nanoparticle monolayer film, wherein 55nm gold nanoparticles are used. The reflected light of the nanoparticle monolayer film is golden, and the projected light is dark blue. Scanning electron microscope pictures show that the nanoparticle monolayer film is of good quality, with only a few pinholes present.

[0077] 2. Preparation of a gold nanoparticle monolayer film coated...

Embodiment 2

[0083] Plan (A)

[0084] refer to Figure 5 (A), a one-dimensional assembly of noble metal nanoparticles with adjustable pitch, the preparation method of which comprises the following steps:

[0085] 1) making a gold nanoparticle monolayer film (by the method of Example 1);

[0086] 2) Etching the pattern and adjusting the spacing of the nanoparticles, specifically:

[0087] 2-1) making a mask on the gold nanoparticle monolayer film;

[0088] 2-2) transferring the pattern on the mask to the monolayer film by RIE etching;

[0089] 2-3) Degumming;

[0090]2-4) Perform in-situ RIE etching (low power or short-time RIE etching) on ​​the nanoparticles in the gold nanoparticle monolayer film, and adjust the spacing of the nanoparticles: reduce their size by 1nm to 5nm , the particle spacing can be controlled at 2nm to 10nm (the size of the gold nanoparticles adopted in this embodiment is about 55nm, then it can be considered that the nanoparticles have about 5 to 2 particles in ...

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Abstract

The invention discloses a noble metal nanoparticle one-dimensional assembly with adjustable spacing and its application in nanosensors. The preparation method of the nanoparticle one-dimensional assembly includes the following steps: 1) making a nanoparticle monolayer film; 2. ) using electron beam lithography in combination with RIE etching to make desired etching patterns on the monolayer film, and to etch the nanoparticles in the monolayer film in situ to adjust the nanometer size by RIE etching. particle spacing. The method provided by the invention can form a one-dimensional assembly structure of any shape by performing nanopatterning on the surface of the noble metal nanoparticle self-assembled monolayer film, and can accurately control the spacing of the nanoparticles, so that the one-dimensional assembly of the nanoparticles can be precisely controlled. Optical properties: It can produce corresponding optical responses to changes in the surrounding dielectric environment. Using this optical property, it can be applied to nano optical sensors, nano biosensing or nano gas sensing.

Description

technical field [0001] The invention relates to the field of nanomaterials, in particular to a one-dimensional assembly of noble metal nanoparticles with adjustable spacing and its application in nanosensors. Background technique [0002] Noble metal nanoparticles have special nano-optical properties and are the basic unit materials for constructing nano-optical components. Compared with individual particles, the specific assembly structure of noble metal nanoparticles has unique electronic, chemical, and optical properties. The formation and other aspects of noble metal nanoparticles have great research value; the one-dimensional assembly of noble metal nanoparticles has nonlinear electron transport characteristics, and can be used for wires or basic unit devices in nanocircuits in the miniaturization design of future electronic devices; Localized plasmon resonance (LSPR) coupling between metal nanoparticles in 1D assemblies enables light waves to propagate hundreds of nan...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/41B82Y30/00B82Y40/00B82Y15/00
CPCB82Y15/00B82Y30/00B82Y40/00G01N21/41
Inventor 张志强黎海文张涛刘聪蒋克明周武平
Owner SUZHOU INST OF BIOMEDICAL ENG & TECH CHINESE ACADEMY OF SCI
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