SERS substrate of metal-modified semiconductor-based bionic compound eye bowl structure and construction method
The present invention discloses an SERS substrate of a metal-modified semiconductor-based bionic compound eye bowl structure and a construction method, and belongs to the technical field of nano materials. The present invention is based on a multi-time interface self-assembly method. Firstly, a small ball template is constructed by using a gas-liquid interface assembly process. Then, a semiconductor bowl structure array is induced to be formed by the template by using a solid-liquid interface assembly process. Next, a semiconductor bowl is assembled to a surface of a pyramid-shaped cone to form a bionic compound eye structure by using a transfer process. Finally, a surface of the bionic compound eye structure is modified with a layer of uniformly distributed metal particles by a physical deposition method or a chemical deposition method, thereby forming the SERS substrate of the metal-modified semiconductor-based bionic compound eye bowl structure.
1. A construction method of an SERS substrate of a metal-modified semiconductor-based bionic compound eye bowl structure, comprising the following steps:
(1) performing self-assembly on small balls with a diameter of 0.01-10 μm in a gas-liquid interface to obtain closely arranged single-layer balls;
(2) transferring the single-layer balls obtained in step (1) to a surface of a semiconductor precursor solution, assembling semiconductor films on surfaces of the small balls below liquid level in situ to obtain small balls with the semiconductor films attached to lower surfaces;
(3) transferring the small balls with the semiconductor films attached to the lower surfaces obtained in step (2) to surface of a cone-shaped structure substrate, and then removing the small balls to obtain an SERS substrate of a semiconductor-based bionic compound eye bowl structure; and
(4) modifying a surface of the SERS substrate of the semiconductor-based bionic compound eye bowl structure obtained in step (3) with metal particles to obtain the SERS substrate of the metal-modified semiconductor-based bionic compound eye bowl structure that consists of cone-shaped structure substrates and semiconductor-based bionic compound eye bowl structures on surfaces of the cone-shaped structure substrates;
wherein a height of the cone-shaped structure substrate is 1-100 μm, and a particle size of the metal particles is 1-100 nm; and
a material of the semiconductor films is silicon, metal oxide, metal sulfide, metal phosphide or a conductive polymer.
2. The construction method according to claim 1 , wherein a material of the metal particles is one or more of gold, silver, palladium, platinum, copper, lithium or sodium.
3. The construction method according to claim 1 , wherein a material of the cone-shaped structure substrate is one or more of silicon, silicon dioxide, metal oxide, metal sulfide, metal phosphide, a thermosetting polymer, a thermoplastic polymer, a photocuring polymer, polydimethylsiloxane or a derivative of these materials.
4. The construction method according to claim 1 , wherein in step (4), the surface of the SERS substrate of the semiconductor-based bionic compound eye bowl structure are modified with the metal particles by a magnetron sputtering, physical vapor deposition, atomic layer deposition, chemical vapor deposition or precursor solution reaction method.
5. The construction method according to claim 1 , wherein a material of the small balls is one of silicon dioxide, polystyrene, polymethyl methacrylate, polyacrylic acid, polylactic acid, chitosan, gelatin, albumin, starch or a derivative of these materials.
6. The construction method according to claim 1 , wherein the small balls are removed by a solvent washing, solution washing, high-temperature calcination or dry etching method.
7. A method for detecting a Raman signal comprising a step for measuring the Raman signal on a subject in need with the SERS substrate of the metal-modified semiconductor-based bionic compound eye bowl structure of claim 1 .
8. The method according to claim 7 , wherein the subject contains harmful substances.