Researchers from the University of Illinois have developed a low-cost, reusable sensor for the detection of hydrogen peroxide. The sensor detects H2O2 over the range of biologically relevant concentrations (including as low as 0.016 uM) with sensitivity thresholds of up to 4903 uA mM-1 cm-2, with performance demonstrated in test solutions designed to mimic human blood. The device uses Bi2Te3 as its active material and can be fabricated at room temperature using conventional processes, making the sensors far less expensive than alternative commercial or pre-commercial solutions.