Side by side ZnO/ZnS hetero-junction nanocrystal arrays with superior field emission property

Zhang, Xitian; Chen, Meilu; Wen, Jing; Wu, Lili; Gao, Hong; Zhang, Di

doi:10.1039/c2ce26214b

Cited by 19 publications

(17 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…4A). [26][27][28] However, the typical band gap emission at 380 nm, as observed for the commercial ZnO powder, was quenched in the ZnS-ZnO hybrids (ZZ-a and ZZ-c). This result further demonstrates the essential role of the ZnS-ZnO interfaces on the visible-light-driven H 2 production.…”

Section: Effect Of Zns To Zno Ratiomentioning

confidence: 85%

Nanoparticle heterojunctions in ZnS–ZnO hybrid nanowires for visible-light-driven photocatalytic hydrogen generation

et al. 2013

View full text Add to dashboard Cite

We report one-step hydrothermal preparation of ZnS-ZnO hybrid nanowires consisting of well-distributed nanoparticle-heterojunctions that induce high activity for visible-light-driven H 2 evolution even without any noble metal co-catalysts. During the growth process, the nanoparticulated ZnS nanowires formed first, followed by ZnO nanocrystal growth with intercalation inside the ZnS nanowires. This growth mode could result in enriched ZnS-surface-states on the ZnO nanocrystal surfaces, as evidenced by the weakened absorption features and quenched band gap emission of ZnO in the ZnS-ZnO hybrid nanowires. Further studies by varying the ZnS to ZnO ratio in the ZnS-ZnO hybrids also proved that the population of ZnSsurface-states is crucial to the visible-light activity for photocatalytic H 2 evolution. This work provides a meaningful way to develop heterostructured composites as visible-light-active photocatalysts by using wide band gap semiconductors for solar fuel production.

show abstract

Section: Effect Of Zns To Zno Ratiomentioning

confidence: 85%

Nanoparticle heterojunctions in ZnS–ZnO hybrid nanowires for visible-light-driven photocatalytic hydrogen generation

et al. 2013

View full text Add to dashboard Cite

show abstract

“…No epitaxial relationship between the ZnS and the ZnO was found. Epitaxial relationship between ZnO and ZnS was frequently found in some high temperature synthesized ZnO@ZnS samples [18][19][20][21] in spite of a large mismatch between ZnO and ZnS structures. In this work, ZnS NPs are uniformly and randomly distributed on ZnO core surface because of the low atomic mobility at low temperature.…”

Section: Characterizations Of the Zno@zns Csnpsmentioning

confidence: 99%

“…Various ZnO@ZnS core-shell nanostructures have been synthesized, most of them at elevated temperature. [17][18][19][20][21][22][23] Epitaxial growth of ZnS shell on ZnO core is obtained by the high-temperature syntheses. In contrast, low-temperature synthesis with low cost can lead to a uniform nanocrystalline ZnS shell structure, but so far only a limited number of publications can be found.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, structural characterization and photocatalytic application of ZnO@ZnS core–shell nanoparticles

et al. 2014

View full text Add to dashboard Cite

ZnO nanoparticles were synthesized by co-precipitation with no capping agent followed by covering with ZnS using a solution-based chemical method at low temperature. By variation of the solution concentrations it was found that the fully-covering ZnS shell forms by a reaction of Na 2 S with ZnO NPs followed by the formation of ZnS nano-crystals by the reaction of Na 2 S with ZnCl 2. The mechanism that led to full coverage of the ZnO core is proposed to be the addition of ZnCl 2 at a later stage of the growth which guarantees a continuous supply of Zn ions to the core surface. Moreover, the ZnS nanocrystals that uniformly cover the ZnO NPs show no epitaxial relationship between the ZnO core and ZnS shell. The slow atomic mobility at the low reaction temperature is attributed to the non-epitaxial uniform ZnS shell growth. The rough surface of the ZnO grains provides initial nucleation positions for the growth of the ZnS shell nano-crystals. The low growth temperature also inhibits the abnormal growth of ZnS grains and results in the homogeneous coverage of ZnS nano-crystals on the ZnO core surface. The as-synthesized ZnO@ZnS core-shell nanoparticles were used as a photocatalyst to decompose Rose Bengal dye at three different pH values. ZnO@ZnS core-shell nanoparticles perform as a more active photocatalyst at a pH of 4, while pure ZnO nanoparticles are more efficient at a pH of 7.

show abstract

“…Due to this, many researchers have devoted considerable effort to design and control the synthesis of ZnO@ZnS CSNPs. Different ZnO@ZnS core-shell nanostructures have been synthesized but most of them were grown using methods rely on elevated temperature [5][6][7]. It will be of interest to synthesize ZnO@ZnS at low temperature to enable the use of soft and flexible substrates.…”

Section: Introductionmentioning

confidence: 99%

Metal oxide nanostructures synthesized on flexible and solid substrates and used for catalysts, UV detectors, and chemical sensors

et al. 2015

View full text Add to dashboard Cite

In this paper we demonstrate the visibility of the low temperature chemical synthesis for developing device quality material grown on flexible and solid substrates. Both colorimetric sensors and UV photodetectors will be presented. The colorimetric sensors developed on paper were demonstrated for heavy metal detection, in particular for detecting copper ions in aqueous solutions. The demonstrated colorimetric copper ion sensors developed here are based on ZnO@ZnS core-shell nanoparticles (CSNPs). These sensors demonstrated an excellent low detection limit of less than 1 ppm of copper ions. Further the colorimetric sensors operate efficiently in a wide pH range between 4 and 11, and even in turbulent water. The CSNPs were additionally used as efficient photocatalytic degradation element and were found to be more efficient than pure ZnO nanoparticles (NPs). Also p-NiO/n-ZnO thin film/nanorods pn junctions were synthesized by a two-step synthesis process and were found to act as efficient UV photodetectors. Additionally we show the effect of the morphology of different CuO nanostructures on the efficiency of photo catalytic degradation of Congo red organic dye.

show abstract

Side by side ZnO/ZnS hetero-junction nanocrystal arrays with superior field emission property

Cited by 19 publications

References 37 publications

Nanoparticle heterojunctions in ZnS–ZnO hybrid nanowires for visible-light-driven photocatalytic hydrogen generation

Nanoparticle heterojunctions in ZnS–ZnO hybrid nanowires for visible-light-driven photocatalytic hydrogen generation

Synthesis, structural characterization and photocatalytic application of ZnO@ZnS core–shell nanoparticles

Metal oxide nanostructures synthesized on flexible and solid substrates and used for catalysts, UV detectors, and chemical sensors

Contact Info

Product

Resources

About