Nanostructured Surfaces
Fabrication and Versatile Use of Spatially Defined Electrospun Nanofibers for Nanopatterning of Functional Materials for Nanolitographic and Nanoplasmonic Applications 
Kiremitler N.B.1, Onses M.S.1
1 Department of Material Science and Engineering, Nanotechnologhy Research Center (ERNAM) Erciyes University, Kayseri, 38039, Turkey
E-mail: nuriburak@erciyes.edu.tr

In this work we present a novel, versatile and economic unconventional way of nanopatterning functional materials by means of using nanofibers as an unusual way. Spatially defined nanofibers are fabricated by an advance electrospinning method: Near Field Electrospinning (NFES). Briefly to fabricate well-defined nanoscale patterns, we use nanofibers fabricated by NFES by two complementary approaches. 
In the additive approach nanofibers generated by from end functional polymers are grafted to surface of the subrate to form polymer brushes via thermal process. The localized grafting of brushes allowed chemical patterns under the projectile of nanofibers. We show possibility of fabrication of linear patterns with sub 100 nm widths by controlling process parameters and interfacial surface energy of fiber-substrate. 
Other method as we named as “Electrospinnanolitography (ESPNL)”[1] is a subtractive method to fabricate well defined patterns sub 50 nm resolution. Process starts with a substrate functionalized with the target material of interest. Nanofibers are used as mask to protect underlyning functional thin film during the plasma etching, leads to nanopatterns with widths that are equal or smaller than diameter of fiber. 
We showed that metallic nanoparticles can localized self assembled on these nanopatterns that are generated by both appraoaches. Nanopatternes of  polymer brushes forced assembly of nanoparticles into close-proximity configurations and led to intense signals in SERS for nanoplasmonic applications or enables to get conductive patterns for nanoelectronic applications. 

1.	Kiremitler N.B., Pekdemir S., Patarrayo J., Karabel S., Törün İ., Puntes V.F., Onses M.S. Assembly of Plasmonic Nanoparticles on Nanopatterns of Polymer Brushes Fabricated by Electrospin Nanolithography roduction // ACS Mac. Lett.-2017.-6.-P. 603-608. 
2.