A Fast and Simple Method for Separating Gold Nanodecahedrons and Gold Nanotriangular Sheets

Abstract

According to the deficiencies of the prior art, the present invention provides a method for separating gold nano decahedrons and gold nano triangular sheets by using the principle of selective aggregation and de-aggregation of small molecules. Concretely comprise the following steps: (1) first in the mixture of gold nano decahedron and gold nano triangular plate, add a certain amount of trisodium citrate, selectively gather into larger aggregates, and gold nano decahedron is still dispersed (2) Then, using a centrifuge at a certain centrifugal speed, the aggregates formed by the gold nanotriangular sheets are precipitated to the bottom of the centrifuge tube under centrifugal force, while the gold nano decahedrons are still dispersed in the solution, Through the separation operation, the gold nano-decahedron and the gold nano-triangular sheet can be separated; (3) finally, a certain amount of ascorbic acid is added to the aggregate of the gold nano-triangular sheet. Depolymerize to obtain evenly dispersed gold nanotriangular sheets.

Description

technical field [0001] The invention relates to the technical field of separation of gold nano decahedron and gold nano triangular sheet, in particular to a method for separating gold nano decahedron and gold nano triangular sheet using the principle of selective aggregation and disaggregation of small molecules. Background technique [0002] Special morphological gold nanoparticles, such as gold nanotriangular sheets, have broad application prospects in chemical analysis and material performance research. Gold nanotriangular sheets with high synthesis yields are currently an important research direction for the synthesis of nanomaterials. However, the yield of gold nanotriangular sheets synthesized by the traditional "seed crystal growth method" is not high, generally only 40%-50%, and the other is mainly gold nano decahedron. Therefore, in the prior art, gold nanotriangular sheets with higher purity cannot be synthesized by the traditional "seed crystal growth method", an...

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Problems solved by technology

[0005] At present, there are few methods for studying the separation of gold nano-decahedrons and gold nano-triangular sheets. In the literature that can be found, the cost of separation is high and the steps are very complicated: for example: literature Angew.Chem.Int.Ed.2013,52,2886 -2891 uses the DNA separation method, that is, different DNA is modified on the gold nano-decahedron and gold nano-triangular sheet, and the separation is based on DNA hybridization, as shown in the attached figure 1 As shown, the problem of this method is mainly that the DNA is relatively complicated, the separation process is also relatively cumbersome, and the separation cost is very high.

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