The overwhelming prevalence of CVD can be attributed to advantages associated with it, such as scalability, industrial maturity of the technique, and adaptability and flexibility through the form factor of the reactor. An example of this adaptability is floating catalyst CVD, where catalyst particles are suspended in a stream of gas containing a hydrocarbon precursor, which decomposes and forms CNTs on the catalyst surface. Tuning the parameters of this process can generate a wide range of CNT bulk morphologies. In plasma-enhanced CVD (PE-CVD), a plasma above the substrate is used to partially dissociate precursor molecules before surface reactions take place. This allows CVD to be done at lower temperatures, which allows better control of CNT properties in some cases. A significant challenge in CNT synthesis by CVD is achieving the required selectivity for chirality, diameter, and other structural parameters for a given application. The CVD process has several parameters that can be used to control structure, including the catalyst type, catalyst morphology (thin film, supported, nanoparticle), gas precursor composition, template, and reaction temperature. Our analysis indicates that the frequency of publications associated with synthesis of CNTs began to decline around 2006. However, while the number of studies on the synthesis of CNTs in general appears to be decreasing, there are some areas of continued active research. For example, some emerging CNT applications require very precise control over chemical and electrical properties, so tuning synthesis parameters to achieve those properties continues to be an active area of research. One particular area of focus is controlling the distribution of chirality. For example, in electrical applications, high selectivity for a particular chirality is needed because the chirality controls the bandgap of a SWCNT. The most widely studied parameters to control chirality involve the catalyst, in particular varying the catalyst particle size, crystal structure, support, and melting point.