Now I'm preparing several TiO2 films for photoelectrochemical CO2 reduction. I want to fix the amount of TiO2 what I want at each film for comparing photoelectrochemical acitivty of TiO2 films.
Hi Chang
I suggest that you accurately weigh your substrates to 4-5 decimal places (e.g. an ITO-coated glass slide), perform your Doctor Blade deposition of TiO2 films, calcine to remove any organic material present in the TiO2 paste, then accurately reweigh the TiO2-coated substrates. The difference between the weights of the uncoated and coated substrates is the amount of TiO2 you have deposited by the Doctor Blade method. You can measure the geometric area (in cm2) of your TiO2 coating to get the TiO2 loading (i,e, mg/cm2)
the key point is the thickness of masking tape. For each coating you should use same masking tape and a sharp blade (not glass or plastic rod). Also, if you decrease the area of film, thickness errors will decrease.
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