Rapid Activation of 3D-Printed Carbon Electrodes by Atmospheric Air Plasma: Toward Electrochemical Drug Analysis.

A low ratio value is typical for graphite and graphene; a high ratio value is characteristic for, e.g., graphene oxide, CB, biochar, etc. Figure a shows the spectra of the PLA standard in the nonplasma PLA/CB sample, and to compare the two electrode samples, plasma 10 and 160 s are shown. In the case of composite samples, only the D and G bands of CB were registered, with the absence of the characteristic bands for PLA. The dependence of the signal intensity ratio of the I D / I G bands on the time of plasma treatment of the electrode surface has an increasing trend ( Figure b).

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