Synthesis, structural, and optical properties of core/shell ZnS:Fe/ZnS nanocrystals

Abstract

ZnS:Fe/ZnS core/shell nanocrystals (NCs) were synthesized by a simple liquid‐solid‐solution (LSS) method and the influence of ZnS shell thickness on the optical properties of ZnS:Fe/ZnS NCs was investigated. The crystalline and optical properties of ZnS:Fe/ZnS core/shell NCs were characterized by X‐ray diffraction (XRD), transmission electron microscopy (TEM), X‐ray photoelectron spectroscopy (XPS), photoluminescence (PL) spectroscopy, UV–Visible spectrometer and FT‐IR spectrometer, respectively. It was found that the ZnS:Fe/ZnS core/shell NCs are highly crystalline and show zincblende structure with an average particle size of about 7 nm. The lattice constants of the ZnS:Fe/ZnS NCs decrease slightly by the introduction of Fe, and the Fe dopants were well doped into the ZnS:Fe/ZnS NCs, as confirmed by XPS. Compared to the pure ZnS:Fe NCs, the ZnS:Fe/ZnS core/shell NCs exhibited significantly enhanced luminescence properties. A red‐shift can be observed in the absorption and PL spectra as the ZnS shells thickened.

Design of a Sorbent to Enhance Reactive Adsorption of Hydrogen Sulfide

“…18,46 After desulfurization, the BE of Zn 2p 3/2 shifts from 1022.4 to 1021.8 eV, indicating that ZnO converted to ZnS after interaction with H 2 S. 24,47 In Figure 5b, one normal peak of S 2p was observed at 161.8 eV, which is assigned the S 2− in Zn−S. 46,48 No other zinc or sulfur species were found.…”

ZnO-Al2O3 nanocomposite as a sensitive layer for high performance surface acoustic wave H2S gas sensor with enhanced elastic loading effect

“…Fig. 6(c) shows there is a BE peak at 162 eV, which is the characteristic of the S 2p transition of sulfide [33][34][35]. Therefore, it is concluded that the ZnO in the composite is chemically reacted with H2S and turns to ZnS.…”

“…It is well known that three key property changes of the sensing layers can contribute to the total responses of SAW sensors, i.e. the changes of mass (mass loading effect), elastic modulus (elastic loading effect) and electrical conductivity (electrical loading effect) [18][19][20]34]. Table 2 summarizes the influences of these different effects on the working frequency (f) and response (frequency shift, ∆f) of a SAW gas sensor.…”

Plasmon‐enhanced photoluminescence from TiO2:Sm3+:Au nanostructure

“…In recent years, numerous investigations have been conducted to achieve stable and intense luminescence, with possible applications in detection, solar cells, nanophotonic devices, and photocatalysis 1–6. Currently, noble metal, due to its ability to localize and enhance the incident electromagnetic field when excited at their plasmon resonance frequency, becomes a good candidate for optical nanostructures to obtain enhancement of luminescence 7–10.…”