Experimental Studies and Modeling of “Starlike” Plasmonic Nanostructures for SERS Application

Abstract

This work describes fabrication and characterization of two types of surfaceenhanced Raman scattering (SERS) substrates based on starlike gold nanoparticles (NPs). Type I SERS substrates are formed by adsorption of gold nanoparticles from chemically synthesized colloidal solution onto the modified glass substrates. Type II SERS substrates are fabricated by the direct nucleation and growth of Au NPs on the modified glass substrates immersed in the precursors solution. Morphology, optical, and SERS characteristics of both types of substrates are studied. Study shows that by varying the diameters of nanostars cores and the lengths of their spikes during the synthesis one can tune the plasmon absorption peak position from visible to near-infrared and achieve the resonance with most of common laser wavelengths. The measured SERS enhancement factors are equal to 10 5 and 10 6 for the substrates of type I and type II, respectively. The modeling of the electric field distribution in the vicinity of nanoparticles are done for exciting laser wavelengths varied in the range from 400 to 1000 nm. Calculated electric field distribution in the vicinity of Au NPs at different λ exc correlates with the SERS enhancement factors obtained experimentally.

Структурні дослідження фоточутливих композитів «НЧ Au/плівка селену»

“…У зв'язку з цим для дослідження нанорозмірних плівок ХСН представляє інтерес метод поверхнево підсиленого раманівського розсіювання світла (Surface Enhanced Raman Scattering (SERS)), заснований на явищі поверхневого плазмонного резонансу (ППР) у масивах наночастинок (НЧ) металів різної морфології. SERS-метод є потужним методом аналізу біологічних молекул, живих клітин та інших речовин у надмалих концентраціях завдяки унікальній властивості -підсиленні раманівського сигналу при збудженні поверхневих плазмонів у нанорозмірних металічних структурах і, відповідно, можливості визначення присутності малої кількості молекул речовин за їхніми характеристичними спектрами [1][2][3][4][5].…”

Fermi resonance in a molecule adsorbed on plasmonic metal film

“…Nevertheless, there were indications that phenomena other than commonly studied enhancement of light absorption, [ 4 ] emission, [ 5 ] or Raman scattering (Surface‐Enhanced Raman Scattering, SERS) [ 6–8 ] can be caused by the external electric field. One of them is a modification of a Fermi resonance (FR).…”

Rapid formation methods of arrays of randomly distributed Au and Ag nanoparticles, their morphologies and optical characteristics

“…Surface-Enhanced Raman Light Scattering (SERS) is an effective method for biological analysis molecules, living cells and substances in ultra-low concentrations, short-range structures of nanoscale chalcogenide films and its changes during annealing and laser irradiation, enhancement of photoinduced mass transport of matter in chalcogenide films, nanostructuring of their surfaces, etc. [1][2][3][4][5][6][7][8][9][10][11][12][13], because such arrays can lead to an increase in the electric field by several orders of magnitude due to the excitation of surface plasmon resonance (SPR).…”