Preparation method of surface plasmonic crystal
A surface plasmon and crystal technology, used in crystal growth, chemical instruments and methods, single crystal growth, etc., can solve the problem of limited modulation of metal particles, and achieve low equipment requirements, low cost, and large sample area. Effect
Inactive Publication Date: 2011-10-19
NANJING UNIV
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However, the degree of modulation of the morphology of the prepared metal particles by these reported methods is very limited.
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[0044] In the present invention, the two-dimensional ordered structure formed by silica colloidal microspheres is used as an initial template to form a metal hemispherical shell on the surface of silica microspheres, and then the template is filled with an organic polymer and removed by chemical etching to obtain a The cavity contains an organic polymer porous film with a metal hemispherical shell, using this structure as a cathode to electrochemically grow metal in the cavity of the porous film, and then remove the polymer film with an organic solvent, and finally obtain a periodic arrangement of metal particles with different morphologies Composition of surface plasmon crystal materials.
[0045] For specific steps, see figure 1 , the whole preparation process in this embodiment can be divided into several steps:
[0046] Step 1. Firstly, two-dimensional hexagonal close-packed colloidal crystals are assembled on a quartz substrate with monodisperse silica microspheres with ...
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Abstract
The invention discloses a preparation method of surface plasmonic crystal and comprises the following steps: arraying submicron or micron silica microspheres on a substrate to obtain a colloidal crystal of two-dimensional hexagonal close-piled microsphere array; utilizing the colloidal crystal as a template, depositing nano metal grains on the surface of the microspheres until a metal semispherical shell membrane is formed on the surface of the microspheres of the colloidal crystal template, and bonding metal leads on the surface of the metal semispherical shell membrane; filling organic polymer into the void of the crystal template until coating the entire template and the contact points of the metal leads and the metal semispherical shell membrane; removing silica colloidal crystal template and the liner so that an organic polymer porous membrane is formed; depositing metal in the spherical cavity of the organic polymer porous membrane by taking the organic polymer porous membrane as the cathode; solving and removing the organic polymer by using methylbenzene to obtain the surface plasmonic crystal which is controllable in terms of shape and appearance. The inventive method features simple technique, and can perform precise control on the shape and appearance of the metal grains.
Description
technical field [0001] The invention relates to the field of preparation of metal micro / nano particles, in particular to a preparation method of surface plasmon crystals. Background technique [0002] In recent years, metal micro / nanoparticles have become a research hotspot for scientists due to their many important applications. Most of the applications are related to the special optical properties of metal micro / nano particles. The free electrons in the metal micro / nano particles will collectively oscillate under the induction of an external electromagnetic field of a certain frequency, which can produce the so-called localized surface plasmon resonance (see U.Kreibig and M.Vollmer, Optical Properties of Metal Clusters , Berlin, Springer, 1995). By changing the size and shape of metal micro / nano particles and the composition of the metal itself, one can adjust the surface plasmon resonance to the desired frequency range (see C.L.Haynes and R.P.Van Duyne, J.Phys.Chem .B ...
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IPC IPC(8): C30B29/00C30B30/02C25D1/00C25D1/10C23C28/02
Inventor 王振林陈卓董晗詹鹏潘剑
Owner NANJING UNIV