Advances in Novel Low-Macroscopic Field Emission Electrode Design Based on Fullerene-Doped Porous Silicon

Abstract

Perspective low-macroscopic field (LMF) emission prototype cathodes based on fullerene C60—doped porous silicon were realized via a two-stage technique comprising the electrochemical etching process of a monocrystalline silicon wafer and functionalization of the acquired porous silicon (PS) matrix with silver-doped fullerene-based carbon structures. The resulting LMF cathode prototypes were studied with SEM and EDS techniques. The formation of an amorphous silver-doped C60-based layer consisting of nanosized aggregates on the matrix surface was established. The emission characteristics of the prototypes were analyzed, crucial parameters including threshold field strength values, emission current density, and effective potential barrier height for electrons were considered. A novel LMF emission model is suggested. It was established that the emitter prototypes realized during this study are on par with or superior to modern and promising field cathodes.

Impedance Spectroscopy of Hierarchical Porous Nanomaterials Based on por-Si, por-Si Incorporated by Ni and Metal Oxides for Gas Sensors

“…An aqueous-alcohol (isopropanol) solution of hydrogen fluoride was used as an electrolyte. Electrochemical etching of silicon wafers was carried out in a 2-chamber cell of the Unno-Imai type; the scheme of the installation is given elsewhere [38][39][40]. The choice of technological conditions for etching is due to the results of previous studies [27,31,41].…”

Multiphoton microscopy of mesoporous silicon

“…Porous silicon is used to create new nanostructured composite materials obtained by incorporation and encapsulation [1][2][3][4][5]. The success of such technological operations depends on adsorption-energy characteristics of the pore surface [6][7][8].…”

Step-By-Step Modeling and Demetallation Experimental Study on the Porous Structure in Zeolites

“…The following statement was considered a rule of thumb in materials science: “Thermodynamic and kinetic conditions of materials production and processing ensure a given composition within the homogeneous area and the properties of the materials obtained” (from classical thermodynamics, where it was necessary to set the temperature and obtain the material, while now it is required to ensure additional conditions, in particular the component pressures of one of the elements (if it is a binary compound), to stabilize the number of point defects in the crystal structure). When materials science started to explore nanomaterials [ 2 , 3 , 4 ], this formula evolved into a more complex dependence, as the properties of materials also depend on the size of the nano-object and its shape [ 5 , 6 , 7 ]. Therefore, it is necessary to introduce the following more complex version of the rule above: “Thermodynamic and kinetic conditions of materials production and processing, as well as the size of nano-objects and their shape, determine properties of the materials [ 8 , 9 ]”.…”