A challenge related to the newly developed CVD method is the requirement of a positive bias to attract plasma electrons to the substrate surface, which needs to be of low electrical resistivity to conduct away the electron current to the bias power supply. Most standard QCM crystals are coated by a thin layer of gold, which also makes them a low resistivity surface, but additional biasing is not applied in conventional operation. Adding a positive bias to draw a current of plasma electrons would potentially also disturb the signal from the quartz oscillations, affecting the measurement. There are a few known modifications to the conventional QCM, where the objective has been to discriminate between neutral and charged species arriving at the crystal. These reports focus on measuring the ionized flux fraction by either adding two grids in front of the crystal for electric bias, or by adding a strong magnetic field in front of the crystal in combination with directly biasing the quartz crystal electrode. The modified QCMs were operated in two different configurations: (i) No bias for measuring the total mass deposition rate 𝑅 t (proportional to the flux), and (ii) Positive bias to repel all (positively charged) ions and measure the mass deposition rate of neutral particles 𝑅 n only. This allows the determination of the ionized flux fraction of the depositing particles. It should, however, be noted that these modified QCMs were all constructed to repel plasma electrons from reaching the positively biased grid and/or crystal electrode. To our knowledge, no biased QCM has so far been employed to attract a flux of plasma electrons in a controlled manner.