A review on ZnS phosphor degradation

Swart, H.C.

doi:10.1002/pssc.200404814

Cited by 9 publications

(1 citation statement)

References 19 publications

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“…Overall, for each electron energy, the intensity decreases by 50-55 % of the initial values after 1 h of irradiation. Since the ZnS emitters are inside the CNTs and the irradiation is performed in UHV conditions, we assume that the degradation is not related to oxidation [29]. More likely, it is possibly the creation/reactivation of defects (which will act as non-radiative centers) and/or the formation of an electric field (which affects the recombination of electron-hole pairs) that account for the observed signal reductions [30].…”

Section: Optical Properties Of the Zn(ga)s@cnt Systemmentioning

confidence: 99%

Inorganically filled carbon nanotubes: Synthesis and properties

Gautam

Bando

Costa

et al. 2010

Pure and Applied Chemistry

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Since the discovery of carbon nanotubes (CNTs) in 1991, widespread research has been carried out to understand their useful physical and electronic properties and also to explore their use in devices. CNTs have many unique properties such as tunable electrical resistance, mechanical robustness, and high thermal conductivity, which when combined with other inorganic materials such as phosphors or superconductors could lead to heterostructures with diverse functionality. We have been able to obtain mass production of such materials wherein CNTs form core-shell heterostructures with metals, semiconductors, insulators, and even metal-semiconductor heterojunctions. The emerging strategy employs a high-temperature chemical vapor deposition (CVD) technique and high heating rates. Interestingly, due to their high temperature stability, CNTs can act as a nanoreactor for production of exotic materials inside it. In this article, we take ZnS-filled CNTs as an example to explain our synthesis strategy. We explore the optical behavior of these complex materials, analyzing both their luminescence and degradation upon exposure to an electron beam. In addition, the mechanical response of filled CNTs has been evaluated individually inside a transmission electron microscope fitted with an atomic force microscopy-transmission electron microscopy (AFM-TEM) sample holder. Many applications can be envisioned for these nanostructures ranging from nanothermometers to photo-protective storage and delivery devices.gle graphitic sheet rolled up into a cylinder with lengths of micrometers and diameters up to 100 nm [2]. In practice, CNTs can be broadly classified in two classes based on their number of walls, i.e., single-and multi-walled CNTs. Several strategies have been developed for their synthesis, such as laser ablation, arc discharge, and chemical vapor deposition (CVD) techniques [1]. Depending on the way the graphene has been assembled, single-walled CNTs can be either metallic or semiconducting. Because of their exotic properties, CNTs have emerged as an attractive candidate in diverse technological applications, such as in polymer composites, sensors, and several others [3].An interesting aspect of the CNTs is their inner cavity, which can be filled with another material in order to create novel heterostructured nanomaterials [4]. In fact, the cavity may act as a template for other elongated structures. These will have extremely large interface areas, which may well induce unusual properties in the ensemble [5]. Moreover, the CNTs could be used as a storage medium for airor moisture-sensitive materials. Led by such motivations, the prospect to fill their inner cavities with different materials such as fullerenes, metals, alloys, fluids, and biomolecules has been extensively investigated [5][6][7]. The filling procedure is based on two methods, (a) wet chemical methods, where chemicals dissolved in solvent are used as precursors and (b) physical methods, where tip-open CNTs are infiltrated with molten materials [5]. However, a maj...

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Section: Optical Properties Of the Zn(ga)s@cnt Systemmentioning

confidence: 99%