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The mass sensitivity (>; 1 micrograms) of current commercial analytical instruments, such as thermal gravimetric analyzers, severely limits their utility for measurement of valuable but poorly soluble materials such as synthetic proteins or DNA fragments. A quartz crystal microbalance (QCM), based on a transverse shear mode piezoelectric crystal operating at high frequencies, is gaining popularity...
Self-assembled monolayer (SAM) techniques offer a new strategy for the immobilization of antibodies, antigens and DNA on the surface of quartz crystal electrodes. The quartz crystal microbalance (QCM) system provides a unique opportunity to monitor, in-situ and in real-time, the rate of adsorption of ethanthiol onto gold. The change in frequency resulting from the adsorption of ethanthiol molecules...
In this paper the authors describe the development and the characterization of a Quartz Crystal Microbalance (QCM) sensor for NO2 detection with the sensitive layer made of a thin films of poly (3,4-ethylenedioxythiophene) (PEDOT). The PEDOT layer was obtained by electropolymerization on one of the gold electrodes of a 10 MHz AT-cut commercial quartz crystal. The sensor performance in terms of sensitivity...
Recently, there has been interest in the fabrication of multiple Quartz Crystal Microbalances (QCMs) on a single substrate, to create a sensor array. The QCM's are ldquowell structuresrdquo etched on an AT-cut quartz substrate, to isolate the devices from one another. However, such devices are ultimately subject to the limitations of the QCM configuration, requiring electrodes and wires on the sensing...
Gold electrode quartz crystal microbalances (QCMs) were used as transducing platform to detect and sense elemental mercury (Hg) in gas phase. The enhanced sensitivity, resulting form the electro-deposition of gold nano-structures on the surface is shown to increase the response magnitude (RM) of the sensors in the presence of ammonia and humidity interference. The concentration of NH3 and H2O was...
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