Liu et al. presented a stable amperometric immunosensor for the early detection of myocardial infarction using gold nanoparticles and graphene oxide nanocomposites. To design the sensing platform, they first prepared nanocomposites based on GO and AuNPs, which were then anchored on electrode surfaces. The nanocomposites provided a large surface area for loading anti-cTnI capture antibody and served as a bridge for fast electron transfer, resulting in increased sensitivity.