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