A GFET-based intelligent and fully customizedAndroid smartphonedevice was developed for the detection of cytokines biomarkers suchas interferon (IFN), interleukin (IL), and tumor necrosis factor (TNF),which are closely related to COVID-19.160 This biosensor consists of 80 dual graphene channel FETs, functionalizedwith cytokine aptamer. Here, TNF is linked to COVID-19.