One-dimensional structures, such as nanofibers, have the smallest dimension for efficient transport of electrons and optical excitations, and can be used in diverse applications such as nano-electronics and photonics as building blocks in bottom-up assembly, which could overcome fundamental limitations of conventional microfabrications based on lithography. Unfortunately, there has not been a well-established technology to fabricate nanofibers. Electrostatic generation or electrospinning, an "old" technology patented in 1934, is promising to fill the blank. The technology has...