Modelling of field desorption of monocrystal nanotip

2nd International School and Conference Saint-Petersburg OPEN on Optoelectronics, Photonics, Engineering and Nanostructures

Nikiforov, K.A.^1 ; Krasnova, A.A.^1

Saint-Petersburg State University, 7-9, Universitetskaya nab., St. Petersburg

199034, Russia^1

关键词: Computer modeling;    Emitter shapes;    Field desorptions;    Local electric field;    Metal nanocrystals;    Nano-structured;    Radius of curvature;    Standalone applications;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/643/1/012009/pdf
DOI  :  10.1088/1742-6596/643/1/012009

来源: IOP

【 摘 要 】

Mathematical and computer model of field desorption process from metal nanocrystal tip is proposed. The radius of curvature on the top of the emitter is about 50 lattice parameters. The model includes initial calculation of intersection between the crystal lattice and emitter shape for bcc and fcc crystal structures. Arbitrary axisymmetric shapes (figures of rotation) can be used for the emitter model. The algorithm for allocation of atoms being desorbed at given time step is based on an analysis of geometric environment with specified local electric field. Polyhedron nanostructured shape of emitter is obtained as result of evaporation. Computer program realization (Matlab stand alone application) is presented.