Method for producing metal complex quantum crystals

Abstract

[Problem] To provide a method for producing a quantum crystal of a metal complex encapsulating plasmon metal quantum dots. [Solution] The presnt quantum crystals are produced by a method charactgerized in that an aqueous solution of plasmon metal complex made from a ligand and a plasmon metal selected from the group consisting of gold, silver, copper, nickel, zinc, aluminium, and platinum, is prepared and brought into contact with a metal carrier made of a metal or a metal alloy having an electrode potential lower than that of the plasmon metal in the aqueous solution, such that the plasmon metal complex is preciptated as quantum crystals arranged on the metal carrier, resulting in having a plasmon enhancement effect. The metal complex crystals encapsulate metal quantum dots, so that an excellent adsorption capability of sample to be detected, as well as an excellent surface plasmon exitation electrofield enhancement effects, are obtained as a result of the quantum size effect.

Description

technical field [0001] The present invention relates to a method for manufacturing metal complex quantum crystals (quantum crystals) containing metal nanocluster quantum dots (quantum dots) in an aqueous solution of metal complexes (metal complexes) and its application. Background technique [0002] Surface-modified nanoparticles that control the shape and size of metal atoms to the nanometer level and form nanoclusters have attracted people's attention as representative substances in the field of nanotechnology in the future. This is because quantum size effects found in the field of nanotechnology engineer new electronic properties. Here, "nano-cluster" is an aggregation of several to hundreds of atoms / molecules, and its size is between a few nanometers and tens of nanometers. These nanoclusters are larger than molecules and smaller than nanocrystals. Nanoclusters are substances that perform unique functions different from atoms / molecules / solid hosts. By controlling the...

AI Technical Summary

Problems solved by technology

[0008] However, the substrate formed by the vapor deposition method does not have the function of adsorbing the sample, so the so-called drop&dry method can only be used to form the substrate by coating the sample and drying it, but it has disadvantages such as difficulty in real-time detection and deterioration of the sample.

In particular, the biggest difficulty lies in the poor repeatability of the measurement results, which has become a major obstacle to various applications of the SERS method.

[0009] In this regard, back to the original point, the enhancement of the plasmon phenomenon depends on multiple parameters, which include various binding positions and orientations existing in the adsorbed molecules on the metal surface related to the electromagnetic field. Therefore, in order to provide the most suitable The substrate of the SERS method, to ensure the repeatability, needs to achieve the best physical condition of the surface plasmon resonance in the metal that enhances the local intensity of the incident light to participate in the mechanism of the SERS phenomenon; (2) the metal surface and Raman The optimal chemical state for the formation of charge transfer complexes between active molecules and the subsequent transformation, and in order to achieve the optimal physical state, although it is slightly difficult to control the particle size and arrangement to the optimal state, evaporation can be used. However, the optimal chemical conditions for the formation of charge transfer complexes cannot be simultaneously achieved by evaporation

Images