wherein {HEAD ~ the plurality} of sensor areas are made available, and are sensitive to nanoparticles of different sizes and the plurality of sensor areas have {TAIL ~ a specificity} to specific size classes of nanoparticles 
wherein { HEAD ~ the plurality } of sensor areas are made available , and are sensitive to nanoparticles of different sizes and the plurality of sensor areas have { TAIL ~ a specificity } to specific size classes of nanoparticles
OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH