We also use ceramic 3D‐AJP to construct a 3D ZnO‐based biosensor and show that it can rapidly (in 20–30 s) detect Her2 antigen, an important biomarker for human breast cancer at a very low limit of detection of 0.0193 fm, demonstrating the breadth of applications enabled by our work. Here, ERBB2 is linked to breast carcinoma.