In 2009, Thorsen’s group fabricated side-by-side nanofibers by microfluidic electrospinning (Srivastava et al., 2009). There are many benefits to making use of the microfluidic devices, such as rapid prototyping, ease of fabrication, and the ability to spin multiple Janus fibers in parallel through arrays of individual microchannels. There are electrospun conductive and nonconductive side-by-side nanofibers of PVP and polypyrrole (PPy)/PVP. The schematic of the electrospinning setup is shown in Fig. 5.15A. The TEM image of the nanofibers is shown in Fig. 5.15B. There is an evident boundary in the middle of the fibers, indicating the formation of biphasic Janus nanofibers.