Abstract: A preparation method for a high-strength and high-biocompatibility silk fibroin hydrogel scaffold with a biomimetic microstructure for repair and reconstruction of tendons/ligaments. The preparation method includes processing a natural silk fibroin material through directional freezing and coaxial hot stretching. The heating temperature is higher than a glass transition temperature of the silk fibroin material, such that a maximum tensile strength of the silk fibroin hydrogel scaffold increases, a microscopic directional pore structure is formed, and finally a mechanically reinforced hydrogel scaffold with good biocompatibility is obtained. The artificial tendon/ligament scaffold prepared by using the hydrogel scaffold reaches mechanical strength similar to that of the tendons/ligaments in the human body and has good biocompatibility.

Abstract: The present disclosure provides a high-resolution graphene heterojunction based pressure sensor. The present disclosure relates to the technical field of pressure sensor design. The present disclosure uses a graphene/hexagonal boron nitride/graphene (G/h-BN/G) vertical heterojunction thin film as a pressure-sensitive diaphragm. A sensor substrate has a micro-nano arrayed concave cavity structure. Under the action of atmospheric pressure, the G/h-BN/G vertical heterojunction thin film generates localized internal stress, which changes an energy band structure of the vertical heterojunction thin film, and thus changes a tunneling current between the two upper and lower graphene layers, thereby reflecting the external atmospheric pressure changes. The principle of the graphene heterojunction based pressure sensor is based on tunneling effect.