Synthesis, structural, and optical properties of type-II ZnO–ZnS core–shell nanostructure

Sookhakian, M.; Amin, Yusoff Mohd; Basirun, Wan Jefrey; Tajabadi, M.T.; Kamarulzaman, Norlıda

doi:10.1016/j.jlumin.2013.07.032

Cited by 84 publications

(53 citation statements)

References 52 publications

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“…Two conclusions can be drawn from the XRD and FESEM results of the Pd NCs-PPy. First, the pyrrole monomers are able to reduce Pd 2+ to Pd, which alone undergoes oxidative polymerization to PPy, and second, the polymerized PPy encapsulates the surface of Pd nanoparticles forminga nucleus for further growth, via the Ostwald ripening process [30][31][32], which acts as a barrier against the corrosive NaOH environment. In addition, the surface energy and capping effect are considered as the major driving force for the nanoparticle formation [33].…”

Section: Resultsmentioning

confidence: 99%

A sensitive electrochemical nitrate sensor based on polypyrrole coated palladium nanoclusters

Mahmoudian

Alias

Basirun

et al. 2015

Journal of Electroanalytical Chemistry

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Section: Resultsmentioning

confidence: 99%

A sensitive electrochemical nitrate sensor based on polypyrrole coated palladium nanoclusters

Mahmoudian

Alias

Basirun

et al. 2015

Journal of Electroanalytical Chemistry

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“…This implies that the quenching would have taken place in ZnS QDs because of the interaction with Co dopant and Ni do-dopant. Red emission is because of transition between deep level states formed due to dopant and co-dopant [23]. Fig.…”

Section: Pl Studymentioning

confidence: 99%

“…The n value for a direct band-gap semiconductor is 1/2, and is 2 for an indirect band-gap semiconductor. ZnS is a direct band-gap semiconductor, therefore n=1/2 [23]. Thus, the estimated band-gap can be obtained from the plot of (αhν) 2 vs hν as shown in the Fig.…”

Section: Uv-visible Studiesmentioning

confidence: 99%

Influence of Co-Dopant on Structural, Optical and Electrochemical Properties of Zinc Sulphide Quantum Dots

Velusubhash¹,

Kalirajan²,

Harikengaram³

et al. 2018

JNST

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In the present work, solution based simple chemical precipitation method has been employed to prepare undoped, cobalt (Co)-doped and cobalt, nickel (Co, Ni) co-doped ZnS quantum dots (QDs). The XRD pattern revealed that all samples displayed cubic zinc blende structure. The average crystallite size of as prepared ZnS QDs were found to be in 1.0 to 1.4 nm range. Surface morphological of synthesized samples were recorded and some distinction in morphological features between undoped, doped and co-doped ZnS QDs were noticed. EDX analysis confirms the presence of all corresponding elements in the samples. The blue-shift in the absorption spectra was observed. The optical band gap energy (Eg) for all the hybrid ZnS QDs samples were evaluated by using UV-Visible optical absorption spectral data. In PL analysis, emission band at 660 nm was found to be quenched as ZnS QDs interact with dopant and co-dopant. Electrochemical analysis was carried out by transition of photogenerated electrons in undoped, cobalt (Co)-doped and cobalt, nickel (Co, Ni) co-doped ZnS QDs modified glassy carbon electrodes. To authenticate the results of PL and electrochemical studies, photocatalytic behaviour of QDs were studied and positive impact of doping and co-doping process on photo degradation were noticed and discussed.

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“…13 As it has relatively low toxicity, ZnS has been used to reduce heavy metal toxicity, preventing the formation of Cd 2+ on the surface of CdSe and the degradation of water pollutants. 29,30 These investigations describe the synthesis of ZnO and ZnS nanostructures of various morphologies and properties. 29,30 These investigations describe the synthesis of ZnO and ZnS nanostructures of various morphologies and properties.…”

Section: Introductionmentioning

confidence: 99%

Facile synthesis of core/shell ZnO/ZnS nanofibers by electrospinning and gas-phase sulfidation for biosensor applications

Baranowska‐Korczyc

Sobczak

Dłużewski

et al. 2015

Phys. Chem. Chem. Phys.

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This study describes a new method of passivating ZnO nanofiber-based devices with a ZnS layer. This one-step process was carried out in H2S gas at room temperature, and resulted in the formation of core/shell ZnO/ZnS nanofibers. This study presents the structural, optical and electrical properties of ZnO/ZnS nanofibers formed by a 2 nm ZnS sphalerite crystal shell covering a 5 nm ZnO wurtzite crystal core. The passivation process prevented free carriers from capture by oxygen molecules and significantly reduced the impact of O2 on nanostructure conductivity. The conductivity of the nanofibers was increased by three orders of magnitude after the sulfidation, the photoresponse time was reduced from 1500 s to 30 s, and the cathodoluminescence intensity increased with the sulfidation time thanks to the removal of ZnO surface defects by passivation. The ZnO/ZnS nanofibers were stable in water for over 30 days, and in phosphate buffers of acidic, neutral and alkaline pH for over 3 days. The by-products of the passivation process did not affect the conductivity of the devices. The potential of ZnO/ZnS nanofibers for protein biosensing is demonstrated using biotin and streptavidin as a model system. The presented ZnS shell preparation method can facilitate the construction of future sensors and protects the ZnO surface from dissolving in a biological environment.

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Synthesis, structural, and optical properties of type-II ZnO–ZnS core–shell nanostructure

Cited by 84 publications

References 52 publications

A sensitive electrochemical nitrate sensor based on polypyrrole coated palladium nanoclusters

A sensitive electrochemical nitrate sensor based on polypyrrole coated palladium nanoclusters

Influence of Co-Dopant on Structural, Optical and Electrochemical Properties of Zinc Sulphide Quantum Dots

Facile synthesis of core/shell ZnO/ZnS nanofibers by electrospinning and gas-phase sulfidation for biosensor applications

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