4.1 using QCM measurement) that do not have thin film coatings.From the experimental results is found, when there comes the TNT vapor deposition on QCM will cause the frequency of QCM changed into more of a measure in the air, but it is not clear because of an ERROR from the stirring of other contaminants in the air, which is a sensor to measure the mass of all kinds coming deposition on the surface of the sensor by the results of the trial are shown 4.
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