AC-Electrogravimetry Aspects

The principle of AC-electrogravimetry measurements is given in Fig. 14. The modified QCM working electrode was polarized at a chosen potential V and a sinusoidal small-amplitude potential 

As shown previously, the model produces two different transfer functions Am/AA ( y) and AE/AI co). So, a numerical treatment is necessary to obtain the final experimental transfer functions comparable with these theoretical quantities from the raw experimental transfer functions, AVf/AV co) and AV/R AI a ). The most important part is to convert the response A Vf from the microbalance frequency changes, A/m- 

As mentioned previously, the raw transfer function given by the frequency response analyser, A Ff/A V( ), must be corrected to obtain the final mass/potential transfer function, Am/AE co). 

This quantity is usually evaluated by using copper or silver electrodeposition.2 ° 

A/jn/AFf( y) is the inverse of the frequency/voltage converter sensitivity and can be estimated by using the following equation  

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