Carbon nanotubes are widely known at a fundamental research point of view for their unique structural, electronic and mechanical properties in many fields, including biological, electronics and materials. However, before they can reach their full potential in practical and affordable applications, issues such as purity, solubility and homogeneity of nanotube type need to be resolved. Specifically, to solve issues of solubility and homogeneity, silylation of relatively pure as-prepared single-walled carbon nanotubes was carried out, which provided for increased solubility and reactive selectivity towards semiconducting tubes of specific diameter range. The fundamental point to note is that coatings of dielectric materials can be placed onto SWNT ends and sidewalls through a well-defined, relatively mild molecular reaction, which is structurally non-destructive to the nanotube itself. In addition, this coating has facilitated an increased solubility and stability of the trimethoxysilane �SWNTs adduct in DMF. Techniques such as SEM, TEM, AFM, NMR, IR, UV-Vis, XPS and Raman were used in analyzing nanotube samples.