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Physics Principles and Applications University of …：物理学的原理与应用大学…
Lecture 9 Chemical Sensors Chemical Sensors Chemical sensor systems www.ipc.uni-tuebingen.de/weimar/pictures/chem_sensor.gif Calorimetric Chemical Sensors Calorimetric Chemical Sensors Example: detecting Glucose Foil and slug calorimeters Slug calorimeter measures the temperature rise in a slug of known thermal capacity Photos of foil and slug calorimeters Catalytic Sensors Pellistors /technology/pellistors.asp Enzymes Enzyme Sensors Electrochemical Sensors Potentiometric Sensors CHEMFET Sensors Carbon nanotubes Sheets of carbon atoms can be ‘rolled’ up into tubes of nanometer dimensions Layers of nanotubes have a huge surface to volume ratio Carbon nanotubes Carbon nanotubes can be grown en masse, or separated as individuals. Carbon Nanotube sensors CNT FET sensor Can also make FET sensors out of carbon nanotubes A small current in the nanotube causes a much larger current in the FET This particular sensor responds to light. Titanium nanotube sensors H2 gas is ionised when it hits the walls of the titanium nanotubes The resulting electron current is a measure of the amount of hydrogen present. Lecture 10 Empty? Lecture 11 Concentration Sensors Resistive Sensors Gravimetric Sensors Fluid density sensors. Density measurement Nanotube forest Nanotube (blue) lying across electrodes The resistance of the sensor increases upon exposure to N2 gas www.bios.el.utwente.nl/internal/Transducers03/Volume_1/2E80.P.pdf The Scanning Electron Micrograph shows a bridge made from a single nanotube. It is linking two ‘cliffs’ made of Au and Ti. N2 gas is blown up from the bottom www.echo.nuee.nagoya-u.ac.jp/~yohno/research/cnt/qnn03_abstract_submitted.htm /pub_releases/2003-07/ps-tnm072903.php Concentration sensors react to the concentration of a specific chemical. The concentration modulates some physical property (eg resistance or capacitance). Generally speaking, no chemical reaction takes place in the sensor. Often called physical sensors. To detect the presence of a liqu
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