One-step hydrothermal synthesis of shape-controlled ZnS–graphene oxide nanocomposites

Cao, Jianliang; Liu, Qianyu; Han, Donglai; Yang, Shuo; Yang, Jing; Wang, Tingting; Niu, Haifeng

doi:10.1007/s10854-014-2444-7

Cited by 8 publications

(3 citation statements)

References 40 publications

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“…To the best of our knowledge, these kinds of an interesting cluster like ZnS quantum-dot based photodetector device is not yet constructed till now. For attaining the improved charge carrier extraction and responsivity further, the ZnS quantum dot cluster like nanostructures were hybridized with graphene and used as an active layer for photodetector device 45,46 . The present paper discusses the methodology used for attaining clusters like nanostructures and their characterization, then finally the photocurrent study under UV light illumination.…”

Section: Introductionmentioning

confidence: 99%

Highly Responsive Ultraviolet Sensor Based on ZnS Quantum Dot Solid with Enhanced Photocurrent

Premkumar

Nataraj

Bharathi

et al. 2019

Sci Rep

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Detection of visible blind UV radiation is not only interesting but also of technologically important. Herein, we demonstrate the efficient detection of UV radiation by using cluster like ZnS quantum dot solid nanostructures prepared by simple reflux condensation technique. The short-chain ligand 3-mercaptopropionic acid (MPA) involved in the synthesis lead to the cluster like formation of ZnS quantum dots into solids upon prolonged synthesis conditions. The ZnS QD solid formation resulted in the strong delocalization of electronic wave function between the neighboring quantum dots. It increases the photocurrent value, which can be further confirmed by the decrease in the average lifetime values from 64 to 4.6 ns upon ZnS cluster like QD solid formation from ZnS QDs. The ZnS quantum dot solid based UV sensor shows good photocurrent response and a maximum responsivity of 0.31 (A/W) at a wavelength of 390 nm, is not only competitive when compared with previous reports but also better than ZnS and metal oxide-based photodetectors. The device exhibits a high current value under low-intensity UV light source and an on/off ratio of IUV/Idark = 413 at zero biasing voltage with a fast response. Further, photocurrent device has been constructed using ZnS quantum dot solid nanostructures with graphene hybrids as an active layer to improve the enhancement of photoresponsivity.

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Section: Introductionmentioning

confidence: 99%

Highly Responsive Ultraviolet Sensor Based on ZnS Quantum Dot Solid with Enhanced Photocurrent

Premkumar

Nataraj

Bharathi

et al. 2019

Sci Rep

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show abstract

“…Although anatase typically exhibits higher photocatalytic activity than rutile, precise mixtures of both phases display even better performance. For example, Degussa P25, which has 80 % anatase and 20 % rutile, produces novel electronic states at anatase-rutile junctions that result in enhanced charge carrier separation [19,20]. These successful cases also revealed different work functions between anatase and rutile in profile.…”

Section: Introductionmentioning

confidence: 99%

Role of the crystallite phase of TiO2 in graphene/TiO2 photocatalysis

Xia

Min

et al. 2015

J Mater Sci: Mater Electron

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Using chemisorption followed by annealing at different temperatures, TiO 2 with different phases (anatase, rutile and mixed anatase/rutile) have been successfully assembled onto graphene sheet. The corresponding UV and visible induced photoactivities were evaluated using sensitized methyl orange and non-sensitized benzoic acid degradation as a probe reaction. The photocatalytic activities of TiO 2 could be enhanced after assembled with graphene under UV and visible light irradiation both. However, Due to different charge transfer mechanism in UV and visible light irradiation system, the different crystallite phases of TiO 2 acted different roles, hence displayed hierarchical enhancement phenomenon.

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“…Semiconductor NPs have been a subject of extensive interest because of their extensive applications such as photocatalysis, optical sensitizers, novel biomolecular applications, quantum devices and so on [21][22][23][24]. Recently, semiconductor NPs such as TiO 2 , ZnO and ZnS quantum dots have also been utilized to decorate graphene nanosheets (GNs) to prepare graphene-based nanomaterials with remarkable optical and photovoltaic properties [25][26][27][28][29][30]. Among them, ZnS NPs is an important II-VI semiconductor with bandage energy of 3.65 eV and has been studied extensively because of their wide applications in the fields of light emitting devices, solar cells, sensors, lasers, and optical recording materials for many years [31,32].…”

Section: Introductionmentioning

confidence: 99%

ZnS/graphene hybrid nanomaterials: synthesis, characterization, and enhanced electrochemical performances

Liu

Shao

et al. 2015

J Mater Sci: Mater Electron

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In this study, a facile and efficient strategy for preparing zinc sulfide-graphene nanosheets (ZnS/GNs) hybrid nanomaterials was assisted via a facile and efficient solvothermal method. Field emission gun scanning electron microscopy with energy-dispersive X-ray analysis, transmission electron microscopy, Fourier transform infrared spectrometer, X-ray photoelectron spectra were used. It was observed that the GNs were partially covered by ZnS homogeneous nanoballs. The electrochemical performances of ZnS/GNs hybrid nanomaterials as electrodes were measured and investigated by cyclic voltammetry and galvanostatic charge/discharge techniques. Results indicated that the introduction of GNs highly improved the electrocatalytic activity, durability, and stability of ZnS/ GNs hybrid nanomaterials. Thus, the ZnS/GNs nanocomposites are expected to be an effective electrode materials.

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One-step hydrothermal synthesis of shape-controlled ZnS–graphene oxide nanocomposites

Cited by 8 publications

References 40 publications

Highly Responsive Ultraviolet Sensor Based on ZnS Quantum Dot Solid with Enhanced Photocurrent

Highly Responsive Ultraviolet Sensor Based on ZnS Quantum Dot Solid with Enhanced Photocurrent

Role of the crystallite phase of TiO2 in graphene/TiO2 photocatalysis

ZnS/graphene hybrid nanomaterials: synthesis, characterization, and enhanced electrochemical performances

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