Determination method for geometrical shape of rod-like nano-particle

A rod-shaped nanoparticle and measurement method technology, applied in the field of nanoparticle measurement, can solve the problems of not representing the true value of the whole sample, large test workload, and large human factors, and achieve simple test methods, large test volumes, and repeatability. good effect

Active Publication Date: 2016-02-03
THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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Problems solved by technology

[0004] The most reliable test method for determining the geometry of nanoparticles, such as gold nanorods, in the prior art is to observe with an electron microscope, select a field of view, record the length and width of each nanoparticle, and then calculate the average value. The method can only observe and record a relatively small amount of gol

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  • Determination method for geometrical shape of rod-like nano-particle
  • Determination method for geometrical shape of rod-like nano-particle
  • Determination method for geometrical shape of rod-like nano-particle

Examples

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preparation example 1

[0045] LSPR (longitudinal surface resonance absorption peak) is positioned at the preparation of the gold nanorod sample of 560nm, comprises the steps:

[0046] (1) Place the round-bottomed flask with 0.1M CTAB aqueous solution in a constant temperature water bath at 30°C, add 0.01M chloroauric acid aqueous solution, and then add 0.01M sodium borohydride aqueous solution; after stirring for 3 minutes, statically Put for 2 hours, obtain the seed crystal sol containing gold nanocrystal;

[0047] (2) Mix the CTAB aqueous solution of 0.1M, the chloroauric acid aqueous solution of 0.025M, the silver nitrate solution of 4.5mL of 0.01M, the sulfuric acid solution of 1M and the ascorbic acid (AA) aqueous solution of 0.1M, obtain the growth of gold nanorods solution; the growth solution was placed in a constant temperature water bath, and 2.4 mL of the gold nanocrystal seed sol of step (1) was added to react for 12 hours;

[0048](3) Adding 0.025M chloroauric acid aqueous solution to ...

preparation example 2

[0050] The preparation of gold nanorod samples with LSPR at 800nm, the difference between the preparation method and Preparation Example 1 is that the amount of 0.01M silver nitrate solution in step (2) is increased to 10mL, and the gold nanorod samples with LSPR at 800nm ​​can be obtained solution.

preparation example 3

[0052] The preparation of gold nanorod samples with LSPR at 880nm, the difference between the preparation method and Preparation Example 1 is that the amount of 0.01M silver nitrate solution in step (2) is increased to 11mL, and the gold nanorod samples with LSPR at 880nm can be obtained solution.

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Abstract

The invention relates to a determination method for the geometrical shape of a rod-like nano-particle. The determination method comprises the following steps: (1) dispersing the rod-like nano-particle in a surfactant solution so as to obtain a rod-like nano-particle dispersion liquid; (2) determining the absorption peak of the rod-like nano-particle dispersion liquid by using an ultraviolet spectrophotometer; (3) injecting the rod-like nano-particle dispersion liquid into a disc centrifugal nano-particle size analyzer and carrying out determination by using a differential centrifugal sedimentation process so as to obtain a test particle size dm; (4) calculating the diameter dc of the rod-like nano-particle according to a formula (II); and (5) calculating the length l of the rod-like nano-particle according to a formula (III). According to the invention, the disc centrifugal nano-particle size analyzer is used to determine the geometrical shape of the rod-like nano-particle for the first time, so preparation is made to research on the rod-like nano-particle; and the determination method is simple, has good repeatability and small deviation and can test tens of thousands of gold nanorods at one time, and data obtained through the method has better statistical significance and representativeness.

Description

technical field [0001] The invention belongs to the field of measurement of nanoparticles, in particular to a method for measuring the geometric shape of rod-shaped nanoparticles, in particular to a method for measuring the geometric shape of rod-shaped nanoparticles by using a differential centrifugal sedimentation method. Background technique [0002] Nanoparticles refer to microscopic particles on the order of nanometers, which are particles smaller than 100 nanometers in at least one dimension. Typical nanoparticles are metal or alloy nanoparticles, carbide or nitride nanoparticles, [0003] The unique properties of nanoparticles are not only related to their particle size, but also depend on their geometry to a greater extent. Therefore, how to accurately characterize the geometry of nanoparticles in solution is an important part of their applications in materials, health, environment, nano-products and other fields. [0004] The most reliable test method for determin...

Claims

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Application Information

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IPC IPC(8): G01N15/02
Inventor 葛广路王瑞敏陈岚纪英露吴晓春
Owner THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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