Optical properties from photoelectron energy-loss spectroscopy of low-temperature aqueous chemically synthesized ZnO nanorods grown on Si

Abstract

The optical properties of zinc oxide (ZnO) nanorods (NRs) synthesized by the low-temperature aqueous chemical method on top of silicon (Si) substrate have been investigated by means of photoelectron energy loss spectroscopy (PEELS). The ZnO NRs were obtained by the low temperature aqueous chemical synthesis on top of Si substrate. The measured valence band, the dynamical dielectric functions and optical absorption of the material show a reasonable agreement when the trending and shape of the theoretical calculations are considered. A first-principle calculation based on density functional theory (DFT) was performed using the partially self-consistent GW approximation (scGW 0 ) and compared to the experimental results. The application of these two techniques brings a new analysis of the electronic properties of this material. The experimental results regarding the density of states (DOS) obtained for the valence band using x-ray photoelectron spectroscopy (XPS) was found to be consistent with the theoretical calculated value. Due to this consistency, the same wavefunctions was then employed to calculate the dielectric function of the ZnO NRs. The experimentally extracted dielectric function was also consistent with the calculated values.

Composition, Structural and Optical Properties of Golden Grass

“…In this work, a Fourier transform method was used to derive the dielectric function from the photoelectron energy-loss spectrum associated to one of its photoemission lines, as described in reference [12]. This algorithm removes the core-level shape, eliminates the experimental broadening factors and separates the various inelastic scattering orders.…”

“…In addition, the energy loss distribution of photoelectrons after excitation of inter band transitions (IBTs) and plasmons along their way towards the solid surface allows the retrieval of the dielectric function (DF), using a Fourier Transform method [11]. At earlier work [12], the optical properties of zinc oxide (ZnO) nanorods (NRs) synthesized by the lowtemperature aqueous chemical method on top of silicon (Si) substrate have been also investigated by means of photoelectron energy loss spectroscopy (PEELS). Here, we perform this technique for reveal electronic properties of a sample of golden grass.…”