Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 127, Issue 1, Pages 132-136Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2007.07.020
Keywords
engine oil degradation sensing; thiol sensing; nanoparticles; QCM
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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. (c) 2007 Elsevier B.V. All rights reserved.
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