Enhanced blue emission from ZnS–ZnO composites confined in SBA-15

Gu, Fangna; Yue, Ming Bo; Wu, Zheng; Sun, Lin‐Bing; Wang, Ying; Zhu, Jian Hua

doi:10.1016/j.jlumin.2007.11.083

Cited by 4 publications

(2 citation statements)

References 36 publications

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“…[4][5][6] Considering the optimization of these factors, responsible for efficient photocatalysis, the preparation of the composite/heterojunction of different semiconductors has been adopted to promote the generation of charge carriers and their mobility. [2,[7][8][9][10] Gu et al [11] studied the enhanced optical emission (blue) characteristics of ZnS/ZnO composites confined in mesoporous SiO 2 . In this study, the chemical bonding between Zn and O/S controlled the resultant photocatalytic characteristics due to modified optical emission properties.…”

Section: Introductionmentioning

confidence: 99%

A Comparative Study of ZnS–ZnO Nanocomposite Assembly for Photocatalytic Removal of Crystal Violet Dye

Gupta

Kaur

Pandey

2023

Physica Status Solidi (a)

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Herein, the effect of composition on the optical and photocatalytic performance of ZnS–ZnO composite is described. The composite samples are synthesized by chemical precipitation method using (NaOH + Na2S) mixture as the precipitating agent. The chemical composition of precipitating agent results in in situ formation of ZnO and ZnS. Lower content of NaOH in precipitating agent solution (1:3 by volume) exhibits the formation of ZnS, while, its higher concentration induces the phase separation with higher volume fraction of ZnO as observed from X‐ray diffraction patterns. Optical studies suggest the enhancement of visible absorption along with redshift in the absorption edge of composites as compared with bare ZnS nanoparticles (NPs). Moreover, the incorporation of ZnO with ZnS is also supported by optical emission spectra in which intense emission around 507 nm is associated with S‐species. ZnO encapsulation on ZnS NPs exhibits higher emission associated with O‐ defects as compared to S‐species. Since both are near‐UV excited semiconductors, both contribute toward the generation of charge carriers to produce radicals and hence photo‐oxidation of crystal violet dye. Further, little concentration of ZnO with ZnS NPs exhibits comparable photocatalytic efficiency (≈88%) that is observed with other ZnS–ZnO nanocomposite samples.

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Section: Introductionmentioning

confidence: 99%

A Comparative Study of ZnS–ZnO Nanocomposite Assembly for Photocatalytic Removal of Crystal Violet Dye

Gupta

Kaur

Pandey

2023

Physica Status Solidi (a)

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“…A few examples would be Mn(II) and Co(II), which promote ferromagnetic properties, and Al(III), Ga(III) and In(III), n-type dopants that increase conductivity and overall optical quality of ZnO thin films. La(III) is also used as a doping ion for photocatalytic applications, and the combination of ZnO with ZnS improves photoconductivity and photoluminescence properties. − The doping with lanthanide ions, such as Eu(III), − Tb(III), and Yb(III), has also received considerable attention due to the possibility of applications in electronics and optics systems, by the combination of lanthanides optical properties with ZnO electroluminescence potential. These ions have narrow emission bands that may also be split or intensified through modification of their chemical environment and microsymmetry. , Dorenbos and van der Kolk have built an energy diagram combining the La(II) and La(III) charge transfer (CT) levels and the valence and conduction bands of ZnO.…”

Section: Introductionmentioning

confidence: 99%

Europium(III)-Doped ZnO Obtained by a Hierarchically Nanostructured Multilayer Growth Strategy

Oliveira

Bettini²,

Sígoli

et al. 2015

Crystal Growth & Design

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A layer-by-layer growth method, named herein as impregnation–decomposition cycles (IDCs), was used to build hierarchically nanostructured multilayered nanoparticles, alternating undoped ZnO and Eu(III)-doped ZnO layers in order to thermally induce Eu(III) migration into the ZnO structure. Porous Vycor glass (PVG) was used as a mesoporous silica host, where the pores were used as a confined environment for preparation of ZnO nanoparticles. The proposed method allowed the control over the growth and size of the nanoparticles and prevented their coalescence. HRTEM images and XRD data revealed that ZnO nanoparticles are spheroidal with a wurtzite crystal structure and an average diameter of 4.8 nm for 10 IDCs. UV–vis DRS data indicated that the formation of ZnO nanoparticles is favored by europium(III) doping, indicated by the band-gap absorption detection that also undergoes a red-shift by increasing the IDC number. Photoluminescence emission spectra have shown Eu(III) intraconfigurational 4f–4f and ZnO excitonic emissions. Excitation spectra have shown energy transfers from ZnO to the silica as well as an energy transfer from ZnO to Eu(III) ions, indicating the migration of these ions into the ZnO structure.

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