Functionalization of MWCNTs with Ag-AuNPs by a green method and their catalytic properties

Some new and notable applications of carbon nanotubes (CNTs) require previous treatment, whether they are stabilized or decorated. The present research aims to achieve a homogeneous decoration of multi-walled CNTs with Ag-AuNPs through an alternative process following a low-temperature green synthesis route. The MWCNTs were first stabilized using sodium dodecyl sulfate (SDS) as surfactant agent and evaluated using UV-Vis spectroscopy and scanning electron microscopy (SEM), showing a considerable decrease in nanotubes agglomeration. Subsequently, the synthesis of the Ag-AuNPs proceeded through the reduction of the AgNO3 and HAuCl4 salts, using the A. triphylla plant extract. UV-Vis, SEM, and transmission electron microscopy (TEM) analysis were helpful in determining the formation of the Ag-AuNPs, along with the appropriateness decoration of the MWCNTs. Finally, the evaluation of the catalytic activity of the decorated MWCNTs was conducted by using the degradation of methylene blue dye, showing positive results. This study was developed employing the UV-Vis technique.