Top silver-cladding gold nanorod array and preparation method and application thereof

Abstract

The invention discloses a top silver-cladding gold nanorod array and a preparation method and application thereof. In the array, a gold film is provided with a gold nanorod array of which the top end is cladded with silver nanoparticles with the diameters of between 60 and 90nm, and the bottom surface is provided with an organic matter substrate with the thickness of between 50 and 100 mu m. The method comprises the following steps of: evaporating the gold film on one side of a nano through-hole alumina template, and growing the gold nanorod array in the hole of the template, particularly coating a liquid organic matter on the gold film on one side on which the gold nanorod array does not grow; evaporating the gold film on one side after the liquid organic matter is cured; placing the alumina template of which the hole is deposited with the gold nanorod array and the gold film is coated with the organic matter in acid or alkali solution; etching off the template; and evaporating silver on the top of the gold nanorod array by film evaporating technology to obtain the top silver-cladding gold nanorod array. A trace amount of organic matter rhodamine or 2,3,3'-trichlorodiphenyl can be detected by using the surface enhanced raman scattering effect of the top silver-cladding gold nanorod array.

Description

technical field [0001] The invention relates to a nanorod array, a preparation method and an application thereof, in particular to a gold nanorod array whose top is coated with silver, a preparation method and an application thereof. Background technique [0002] In recent years, the surface-enhanced Raman scattering (SERS) effect of the nanostructures of precious metals gold, silver, and copper has aroused widespread concern among scientific and technical personnel. play an important role in biochemistry and trace detection of organic matter. At present, in order to obtain the nanostructure of the noble metal gold and use it in the trace detection of organic matter, they have made some attempts and efforts, such as in the journal "Spectroscopy and Spectral Analysis", Volume 28, Issue 10, published in October 2008 published an article titled "The Influence of Film Structure on the Surface-enhanced Raman Scattering of Gold Nanowire Arrays". 4-MP) as a probe molecule, it was...

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Problems solved by technology

However, both the gold nanowire array with gold film, its preparation method, and the trace detection of organic matter have shortcomings. First, the gold nanowire array is grown and attached to the gold film. , too thin gold film is easy to break and it is difficult to firmly support the gold nanowire array, so that not only cannot obtain a large-area gold nanowire array that meets the requirements of the SERS effect that can be practically applied, but also makes the array of gold nanowires poor. It is impossible to maintain obvious and uniform gaps between adjacent gold nanowires in the array, which leads to unstable SERS activity and cannot meet the stringent requirements of the ideal SERS effect on the arrangement of gold nanowires in a highly regular order; secondly, Restricted by the strength of the gold nanowires constituting the gold nanowire array, it is difficult to keep the distance between the tops of adjacent gold nanowires consistent, which greatly affects the normal performance of its proper SERS effect; again, the preparation method adopts one side The process of evaporating the alumina template with a gold film and growing gold nanowires in the holes is directly placed in a sodium hydroxide solution to etch away the excess alumina template. Although it has the advantages of simplicity and convenience, it also leads to the aforementioned insurmountable problems Deficiencies; again, only the SERS effect can be used to detect mercaptopyridine, but the organic compound rhodamine or 2,3,3'-trichlorobiphenyl cannot be detected in trace amounts

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