Formation and optical properties of ZnO:ZnFe2O4 superlattice microwires

Abstract

Pure ZnO hexagonal microwires and Fe(Ⅲ)-doped ZnO microwires (MWs) with a novel rectangular cross section were synthesized in a confined chamber by a convenient one-step thermal evaporation method. An oriented attachment mechanism is consistent with a vapor-solid growth process. Photoluminescence (PL) and Raman spectroscopy of the Fe(Ⅲ)-doped ZnO MWs and in situ spectral mappings indicate a quasi-periodic distribution of Fe(Ⅲ) along a one-dimensional (1-D) superlattice ZnO:ZnFe 2 O 4 wire, while PL mapping shows the presence of optical multicavities and related multimodes. The PL spectra at room temperature show weak near-edge doublets (376 nm and 383 nm) and a broad band (450-650 nm) composed of strong discrete lines, due to a 1-D photonic crystal structure. Such a 1-D coupled optical cavity material may find many applications in future photonic and spintronic devices.

The effect of dopant and optical micro-cavity on the photoluminescence of Mn-doped ZnSe nanobelts

“…Usually, the two end facets act as reflecting mirrors to form one Fabry-Pérot cavity in 1D nanostructures. However, multi-cavities can emerge in single doped 1D nanostructure when a dopant with varied refractive indexes is incorporated into the matrix [13,16]. In the HRTEM image (Figure 3f), we can clearly see some impurity and defect sites possibly related to the Mn dopant in the ${\text{normalZnSe}}_{{\mathrm{Mn}(\mathrm{CH}}_3\mathrm{\text{COO}})}{}_{{}_2}$ nanobelt.…”

“…Except for the inorganic semiconductor nanostructures, organic nanofibers can also act as coherent random laser with multi-mode emission [12]. Recent research shows that the formation of multi-intracavities plays an important role in the multi-mode emission [13]. These multi-intracavities can couple to produce coherent emission.…”

Synthesis and characterization of Fe2O3–ZnO–ZnFe2O4/carbon nanocomposite and its application to removal of bromophenol blue dye using ultrasonic assisted method: Optimization by response surface methodology and genetic algorithm

“…The vapor-solid mechanism can be applied here for the growth of formations. The following reactions may be involved in the growth process [12]:…”

“…at 2θ of30.78, 34.29, 35.35, 54.74, 62.09 and 64.12 in the XRD spectra correspond to zinc oxide with the hexagonal structure (space group: P63mc), respectively[12,16]. The diffraction patterns inFig.…”

“…Zinc ferrite (ZnFe 2 O 4 ) nanoparticles have spinel structure as Zn 2+ cations occupy the tetrahedral positions. Zinc ferrite is a semi-conductive material with physical and thermal stability [11][12][13][14][15][16][17]. Ultrasound (US) irradiation is a technique to accelerate the chemical process because of the phenomenon of acoustic cavitation.…”