PT Journal
AU Lieberzeit, P
   Afzal, A
   Rehman, A
   Dickert, F
TI Nanoparticles for detecting pollutants and degradation processes with mass-sensitive sensors
SO Sensors and Actuators B: Chemical
JI Sensors and Actuators B: Chemical
PY 2007
BP 132
EP 136
VL 127
IS 1
DI 10.1016/j.snb.2007.07.020
DE molecular imprinted polymer; MIP; recognition; quartz crystal microbalance; QCM; mass-sensitive sensor; detector
AB Compared with thin films, nanoparticle layers as coatings for QCM offer substantially increased interaction areas and sensitivities with favourable response times. Molybdenum disulphide (MoS2), e.g. has turned out to be a highly suitable material for interacting with thiols. The resulting materials are sufficiently soft according to Pearson to bind sulphur containing compounds reversibly. Depositing MoS2 nanoparticle submonolayers (particle size 200–300 nm) leads to an increase in sensor response by a factor of ten compared to a pure gold layer. Additionally, the nanoparticle layers show fully reversible sensor signals. Particle synthesis can also be combined with the molecular imprinting approach: by a precipitation technique, it is possible to generate molecularly imprinted TiO2 particles for engine oil degradation measurements. Compared with deposited thin layers, particles incorporate oxidised compounds from lubricants by a factor of two better.
ER