Electrochemical sensors have emerged as a feasible approach for biomarker detection owing to their high sensitivity, operational simplicity, and cost‐effectiveness. However, the development of low‐cost, convenient, and common substrate materials with high effectiveness remains a significant challenge. This work presents a new kind of hybrid GO/AgNPs nanostructure (Ag@HA‐GO) for electrochemical detection of biotin‐streptavidin (SA) interactions in biomarkers. Specifically, GO was firstly modified with hexylamine (HA) to expand the interlayer spacing, and then silver nanoparticles (AgNPs) were incorporated within HA‐GO sheets, affording Ag@HA‐GO with good dispersibility and excellent electrical conductivity. To utilize it as a substrate material for detecting biotin‐streptavidin (biotin–SA) interactions, biotin was covalently attached onto the edges of GO sheets within Ag@HA‐GO. In subsequent electrochemical detection of biotin‐SA interaction, it was informed that GCE/biotin‐Ag@HA‐GO could serve as a promising substrate for a sensitive and stable electrochemical sensor, on account of systematical cyclic voltammetry curves. Thus, the designed GO/AgNPs hybrid nanocomposite is expected to act as an effective platform for stabilizing AgNPs, while Ag@GO‐HA demonstrates good stability, selectivity, and reproducibility in the electrochemical detection of biotin–SA under physiological conditions.

For alveolar bone defects, magnesium membrane with the mechanical properties of shielding fibrocyte growth and sustainable release of Mg²⁺ is an excellent choice for guide bone regeneration (GBR) surgery. However, insufficient osteogenesis and bacterial infection have hindered its application. In this study, Mg–Ga-LDH coating was successfully prepared, which delayed the degradation rate of the Mg membranes and greatly reduced the amount of hydrogen evolution. A weakly alkaline microenvironment (pH = 8.5) containing appropriate concentrations of Mg²⁺ and Ga³⁺ was successfully constructed, effectively promoting the adhesion and proliferation of MC3T3-E1 cells. It also upregulated the expression of alkaline phosphatase and collagen, which were conducive to the formation of mineralized nodules, and promoted the osteogenic differentiation of rat bone marrow mesenchymal stem cells in vitro. In addition, Ga³⁺ released from the coating and the generated alkaline microenvironment showed good antibacterial properties against S. aureus and E. coli. The Mg–Ga-LDH coating can effectively reduce the degradation rate of Mg membranes and mitigate inflammation. The Mg–Ga-LDH coating modified Mg membrane promoted new bone formation in cranial defect animal models. This bone-promoting Mg²⁺ and Ga³⁺ releasing platform and weak alkaline microenvironment creation system paves the way for the application of Mg membranes in the field of GBR.