Емісія фотонів з модифікованої сріблом поверхні NaCl при електронному бомбардуванні

Abstract

Досліджено характеристики випромінювання, яке виникає при бомбардуванні повільними електронами поверхні кристалу NaCl з різним ступенем англомерації наночастинок Ag. Аналізується вплив поверхневого плазмонного резонансу наночастинок на спектральний розподіл інтенсивності випромінювання власних дефектів кристалу.

Исследовано характеристики излучения, которое возникает при бомбардировке медленными электронами поверхности кристалла NaCl с разной степенью англомерациями наночастиц Ag. Анализируется влияние поверхностного плазмонного резонанса наночастиц на спектральное распределение интенсивности излучения собственных дефектов кристалла.

The idea of application of a plasmon resonance of nanoparticles for fundamental and applied aspects is progressive. The aim - to investigate influence of nanoparticles of silver on recombinations of the electronic and hole centers of a crystal of NaCl. Technology and technique. Research method - an electron and photon spectroscopy. It is realized in ultra-high vacuum spectrometer at the following experimental parameters: energy of electrons was 400-800 eV, current density on a surface of samples 6-8 mkA/mm2. Radiation was analyzed by the monochromator MDR-6U in the area 280 - 700 nanometers and was detecting by a photo multiplier FEP-106. The objects of research: NaCl crystals with synthesized both on a surface, and in volume Ag nanoparticles. The results. In the spectrum of electron and photon issue of pure NaCl three strips of radiation are found (λ1 = 380 nm, λ2 = 430 nm, λ3 = 560 nm). The nature of these strips is connected with the radiation of own defects of a crystal. In the presence of nanoparticles of Ag intensity of strips increases and there is a shift of maxima to the red area of the spectrum. The analysis of ranges of electro and photon issue, dependences of I (j) and I (t) specifies communication between a plasmon resonance of nanoparticles of Ag and efficiency of radiators of a crystal. Conclusions. At electronic radiation in nanoparticles of silver arises superficial plasmon resonance. The excitation of plasmons is followed by increase in the electronic field near them which in turn influences the centers of a luminescence of a matrix. Efficiency of interaction depends on the selected resonance mode which is determined by the size and an arrangement of particles on a surface.