Honey S. is working as a Graduate Research Student (PhD) at Centre of Excellence in Solid State Physics, University of Punjab, Lahore, Pakistan. She is a fellow of UNESCO UNISA AFRICA Chair in Nanosciences/Nanotechnology and Nanosciences African Network (NANOAFNET), an ICTP network as well. She has published eight papers in reputed journals during her PhD studies.
Interconnection between Ag-NWs is essential for the integration and assembly of NWs networks to enable optoelectronics and nanoelectronics applications. In this report, joining of Ag-NWs through argon ion beam irradiation technology is demonstrated. A range of experimental traits of constructing X-, and II-shapes molecular junctions between Ag nanowires and the utilization of the argon ion beam irradiation induced nanowelding technique to form functional metal NWs networks is conferred. Scanning electron microscopy, X-ray diffraction and transmission electron microscopy results revealed that Ag-NWs are effectively connected to each other on intersecting positions and crystal structure also remained un-damaged. Besides, technical hindrances facing the ion irradiation induced nanowelding technology are also discussed. A perspective is given for using argon ion irradiation induced welding technique for the construction of random networks of well-connected nanowires.
Steve Lenk, Dipl.-Ing. is project coordinator assistant of the European FP7 project “Single Nanometer Manufacturing beyond CMOS devices” (SNM). He graduated at the Faculty of Technical Physics at Technische Universität Ilmenau, specialties Theoretical Physics and Semiconductor Physics, in 2009. In his Diploma thesis he calculated the excitonic dielectric function of GaN. He works currently at his PhD with the topic simulations of the Fowler-Nordheim emission of electrons from ultrasharp nanotips for lithography. He has experience in scientific programming, analytical solutions, and EU projects management. He has 3 publications in scientific journals.
The scanning probe lithography (SPL) is based on the F-N-field-electron emission from a SPM- nanotip and an exposure of a calixarene resist. Since the emitted electron energies are in the range of a few ten electron volts, i.e., in the range of the binding energies of the resist molecules, they are chemically triggered and converted into volatile compounds. The field emission is enhanced due to the geometry of the nanotip (lightning rod effect). Until now, the mechanisms and conditions behind the physical processes are not clearly understood. Therefore, we simulate the emission process using a 2D and 3D model. The 2D method consists of the computation of the emission probability at the tip excluding the original electron energy and of the electron trajectories using a Velocity-Verlet algorithm. Our 3D model additionally includes the electron energy distribution inside the tip and the 3D geometry of an axial symmetric tip. Thus, we are able to calculate a realistic electron energy distribution at the surface with our 3D model. We will compare the two models with experimental Fowler-Nordheim data to show the dependence of the electron density and the energy distribution of the electrons. Additionally, we will present the electric field and electron distribution influenced by the resist material.