Measure method for combined distribution of nanometer particle concentration and geometrical characteristic quantity

Abstract

A provided measure method for combined distribution of nanometer particle concentration and geometrical characteristic quantity comprises providing a spectral measurement system; calibrating the spectral measurement system; calibrating the spectral measurement system by utilizing a standard substance; replacing a standard nanoparticle in a measurement sample cell by a to-be measured nanoparticle, and putting a dispersing solvent of the to-be measured nanoparticle into a reference sample cell; then emptying the reference sample cell, and respectively measuring the to-be measured nanoparticle sample, so as to obtain the relative transmittance, the transmittance and a ratio of 90 DEG diffusion light intensity to reference light intensity; obtaining the 90 DEG diffusion light spectrum of the to-be measured nanoparticle; constructing a geometrical model of the to-be measured nanoparticle, and forming a standard spectral database; creating a reverse problem solving model, solving a reverse problem, and connecting the spectrum obtained through measurement and to-be characterized parameter with the standard spectrum data; and calculating the combined distribution of the nanoparticle concentration and the geometrical characteristic quantity, so as to obtain the to-be characterized parameter.

Description

technical field [0001] The invention relates to the fields of optical measurement and nanometer materials, especially the field of nanometer particle spectrum measurement, especially the field of joint distribution measurement of metal nanoparticle concentration and geometric feature quantity. Background technique [0002] As a new type of nanomaterial, metal nanoparticles have important and extensive applications in photocatalysis, sensing, medical imaging diagnosis, gene and drug delivery and release, and artificial nanostructure processing. Therefore, the characterization of metal nanoparticles becomes an important task for material preparers and users. Gold nanorod particles are currently the most widely used nanoparticles, and their geometric shape can be uniquely determined by the width, aspect ratio and cap factor of the nanorods. When they are dispersed in a certain number of dispersion systems such as water, they constitute a certain concentration of gold nanorod s...

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Problems solved by technology

And because this problem is an ill-conditioned inverse problem, the slight deviation of the directly measured quantity will lead to a huge deviation of the result of the inversion quantity, so the original solution will not be able to obtain accurate results

Therefore, this scheme is only suitable for nanoparticles with lower concentration (absorbance is less than 0.6), and cannot accurately measure the distribution function of the concentration and geometric characteristics of nanoparticles with higher concentrations such as absorbance greater than 0.6.

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