A kind of preparation method of gold nanoparticle pair
A gold nanoparticle and particle size technology, applied in the nano field, can solve the problems of particle agglomeration, difficulty in obtaining particle pairs with high efficiency, and inability to obtain freely moving particle pairs, and achieve the effect of inhibiting agglomeration.
Inactive Publication Date: 2019-02-01
DALIAN UNIV OF TECH
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Problems solved by technology
At first, people used ion beam scribing to prepare particle pairs with uniform spacing and particle size on silicon or glass substrates to study their surface plasmon resonance coupling, but this method cannot obtain freely moving particle pairs.
Linking two particles together through biological / chemical functional groups on the surface of gold nanoparticles is a practical and effective way to obtain free particle pairs, but during the linking process, the functional groups covering the particle surface can be linked to other particles in a full range of angles, Causes the agglomeration of particles, and it is difficult to efficiently obtain particle pairs
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[0027] A method for preparing a pair of gold nanoparticles, which is characterized in that gold nanoparticles fixed on a substrate are used to capture gold nanoparticles freely suspended in a solution, and a particle pair formed by such two gold nanoparticles is a gold nanoparticle Yes, the method includes the following steps,
[0028] Step 1: On the cleaned substrate, grow a layer of polyelectrolyte a, whose charge property is A, such as polycation;
[0029] Step 2: On the substrate with a layer of polyelectrolyte a grown in step 1, the gold nanoparticles with the charge attribute of -A and a particle size of 40 nm are sparsely arranged into a sub-monolayer film structure, and the center distance between the two particles is greater than 100 nm;
[0030] Step 3: On the substrate with sub-monolayer film structure obtained in step 2, grow a layer of polyelectrolyte b with charge attribute -A, such as polyanion;
[0031] Step 4: Surface modification of the gold nanoparticles fi...
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Abstract
The invention discloses a preparation method of gold nanoparticle pairs and belongs to the technical field of nano. The preparation method comprises the steps that gold nanoparticles fixed to a base plate are used for capturing free gold nanoparticles suspending in the surrounding solution of the gold nanopartiles, the gold nanoparticle pairs are formed on the base plate, and then the nanoparticle pairs are detached from the template through ultrasonic vibrations. The preparation method has the advantages that gold nanoparticles can be prepared efficiently and the agglomeration of muti-particles can be inhibited.
Description
technical field [0001] The invention belongs to the field of nanotechnology, and relates to the surface chemical modification of noble metal nano particles and the preparation of noble metal nano probes, in particular to a method for preparing gold nano particle pairs through thiol groups. Background technique [0002] Gold nanoparticles have a unique localized surface plasmon resonance effect (Localized surface plasmon resonance, LSPR), showing strong absorption in the ultraviolet-near infrared band, showing different colors. Its peak absorption wavelength depends on the structural parameters (size, shape, particle distance) of the particle itself and the surrounding environment. This feature makes gold nanoparticles widely used in the field of biosensing and imaging technology, such as signal amplification by labeling small biological molecules with gold nanoparticles (Analyst, 2012, 137, 4712-4719); Injected as a probe into mice to develop cancerous tissues (Science, 201...
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IPC IPC(8): B82B3/00
CPCB82B3/0009B82B3/0061
Inventor 洪昕
Owner DALIAN UNIV OF TECH