Figure 4: (A) Limit of detection of the QCM based TNT sensor. A solution of TNT at concentrations ranging from 0.1ng/mL to 10µg/mL was flowed on to the QCM crystal and the normalized frequency change was calculated. The data points reported were obtained at equilibrium from at least three independent experiments. (B) “Quick” slope analysis for rapid detection of TNT. The concentration of TNT in the solutions analyzed ranged from 0.1ng/mL to 10µg/mL, and the time interval chosen was 10 minutes. The data points reported were obtained from at least three independent experiments.