I was trying to find some information regarding nanotube-embedded chemical and bio-chemical sensors and especially information comparing such sensors to classical capacitive sensors. For example, I need answers to such questions as how can capacitance be detected at the nanoscale? To what tolerance (or percent difference) would such a detector be able to detect the capacitance changes? I am studying MOS capacitors both that include nanotubes and ones that include metal plates. I am interested in any experimental or documented data available on this topic. Please send me references to papers or books or any other information. Papers are generally preferred. I am also interested in general information about traditional and nanotube capacitive chemical and bio-chemical sensors. I greatly appreciate your help in advance.