Only a few studies have compared the diameter of CNF obtained using different techniques. Most of these studies agreed that TEM obtains the highest degree ofprecision in CNF characterization, followed by SEM andAFM. Depending on the technique, the sample preparationis different, which can also have an impact on themeasurement accuracy. In the case of TEM, as alreadymentioned, the preparation of the sample is delicate, comparedto AFM, but the resolution and precision of theimages using AFM are not as good as those of TEM.