Flexible gradient strain film, preparation method and application thereof

Abstract

The invention provides a preparation method of a flexible gradient strain film and application of the flexible gradient strain film and belongs to the technical field of nano film preparation. According to the preparation method of the invention, the surface of a silicon film is etched, so that symmetrical isosceles trapezoid structures with a common bottom edge is formed; the silicon film with the pattern is transferred to a preloaded PDMS substrate; and preloading is released, so that a periodic ripple structure with gradient strain can be prepared. The prepared flexible film with the ripplestructure can generate gradient strain; and strain values of different magnitudes can be obtained in the absence of stretching and repeated sample preparation. The flexible film is suitable for strain engineering research in various environments and under various conditions. The flexible film has the advantages of resource-saving performance, simple preparation process and convenient use; and gradient ripples, the same as uniform ripples, have certain tensile resistance.

Description

technical field [0001] The invention belongs to the technical field of nano film preparation, and in particular relates to a flexible gradient strain film and its preparation method and application. Background technique [0002] In recent years, strain engineering has become a hot research field, especially for strain engineering research on emerging two-dimensional materials and thin film materials. Strain engineering mainly regulates and optimizes the physical and chemical properties of materials by generating certain strains on materials. For example, in the field of semiconductors, researchers have found that by applying strain to the silicon substrate, the mobility of MOS devices can be improved, thereby improving the response time of the device; in the field of photovoltaics, applying strain can make the absorption band edge of the material bias In the field of catalysis, studies have found that strain energy increases the active site of a material on a certain crysta...

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Problems solved by technology

However, the periodic corrugated structure also has its shortcomings. Since the corrugated structure produced is uniform, the wavelength and amplitude are constant, so the tensile strain at all peaks is the same, and the compressive strain at all troughs is also the same. Different values ​​of tensile strain and compressive strain are produced on the same film

In application, if you need to test the influence of different strains on the material, you can stretch or prepare multiple samples with different processes. jig, and the accuracy of the tensile jig is high), the latter requires repeated experiments, which consumes samples and experiment time

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