Additionally, the formation of nanowhisker bundles was described as a time-resolved process in-situ. The e-beam was found to influence the nanowhiskers' growth. In particular, nanowhiskers that were exposed to the e-beam were found to grow slower than the nonirradiated ones. Thus, the in-situ growth in the SEM technique provided valuable insights on the effective reaction conditions (temperature, hydrogen pressure, and reaction time), landing itself into a highly effective analytical and development tool.