Texture Analysis of LiF Thin Films Evaporated onto Amorphous Substrates at Different Temperatures

Nunzio, Paolo Emilio Di; Fornarini, L.; Martelli, Stefano; Montereali, Rosa Maria

doi:10.1002/1521-396x(199712)164:2<747::aid-pssa747>3.0.co;2-3

Cited by 13 publications

(3 citation statements)

References 9 publications

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“…The grazing incidence diffraction showed significantly attenuated signals from the nanoparticles, which suggests that the LiF crystallites became less textured, with the emergence of a (1 1 1) peak, similar to that observed for bulk films [36,37]. The desorption of the LiF particles as well as a lateral coalescence of the remaining particles appeared to occur.…”

Section: Discussionsupporting

confidence: 57%

“…Thermally evaporated LiF has a granular and porous morphology, consisting of crystallites that are nearly an order of magnitude larger than the nominal deposited thickness [33,34] as well as high surface roughness [19,33,35]. Structurally, LiF thin films on many surfaces are similar to their bulk crystallographic structure, typically forming a textured polycrystalline arrangement with either the (1 1 1) or (1 0 0) planes lying nearly perpendicular to the substrate surface depending on the substrate temperature [36,37], and on the substrate [34]. When deposited on organic surfaces, the low sticking coefficient results in the formation of disconnected nanoparticles roughly 0.5 nm in diameter [33,34].…”

Section: Introductionmentioning

confidence: 99%

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LiF Nanoparticles Enhance Targeted Degradation of Organic Material under Low Dose X-ray Irradiation

Maye

Turak

2021

Radiation

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The targeted irradiation of structures by X-rays has seen application in a variety of fields. Herein, the use of 5–10 nm LiF nanoparticles to locally enhance the degradation of an organic thin film, diindenoperylene, under hard X-ray irradiation, at relatively low ionizing radiation doses, is shown. X-ray reflectivity analysis indicated that the film thickness increased 12.04 Å in air and 11.34 Å in a helium atmosphere, under a radiation dose of ∼65 J/cm2 for 3 h illumination with a bi-layer structure that contained submonolayer coverage of thermally evaporated LiF. This was accompanied by significant modification of the surface topography for the organic film, which initially formed large flat islands. Accelerated aging experiments suggested that localized heating was not a major mechanism for the observed changes, suggesting a photochemical mechanism due to the formation of reactive species from LiF under irradiation. As LiF has a tendency to form active defects under radiation across the energy spectrum, this could could open a new direction to explore the efficacy of LiF or similar optically active materials that form electrically active defects under irradiation in various applications that could benefit from enhanced activity, such as radiography or targeted X-ray irradiation therapies.

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Section: Discussionsupporting

confidence: 57%

Section: Introductionmentioning

confidence: 99%

LiF Nanoparticles Enhance Targeted Degradation of Organic Material under Low Dose X-ray Irradiation

Maye

Turak

2021

Radiation

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“…A barrier to the application of LiF thin films, however, is the poor understanding of how the film structure is affected by the processing conditions. Nunzio et al [6] have used scanning electron microscopy to study the microstructures of LiF films, and they report structures that differ significantly from those reported by Kaiser et al In this paper, we demonstrate a technique for the direct study of LiF in the TEM, and use it in conjunction with atomic force microscopy (AFM) to elucidate the structures of LiF films deposited on unheated substrates, and also to study their microstrucural development on annealing. Nunzio et al [6] have used scanning electron microscopy to study the microstructures of LiF films, and they report structures that differ significantly from those reported by Kaiser et al In this paper, we demonstrate a technique for the direct study of LiF in the TEM, and use it in conjunction with atomic force microscopy (AFM) to elucidate the structures of LiF films deposited on unheated substrates, and also to study their microstrucural development on annealing.…”

Section: Introductionmentioning

confidence: 80%

Structural Control of Lithium Fluoride Thin Films

et al. 2005

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Polycrystalline lithium fluoride thin films have a number of existing and potential uses, but the optimization of their microstructure has not yet been addressed systematically. We have developed a means of measuring the porosity in LiF films, and a method for performing detailed electron-microscopical studies on this normally beamsensitive material. These techniques have been applied to assess the structure of LiF films immediately after deposition from the vapor phase, and also after subsequent annealing.

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Micro and sub‐micro fabrication techniques for optically confined structures based on lithium fluoride

Montereali

Mancini

Martelli

et al. 2001

Applied Organom Chemis

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Lithium fluoride (LiF) films treated by lowenergy electrons represent a very promising candidate for the realization of miniaturized broad band optical devices like active waveguides and microcavities. The main properties, in particular the refractive index, density, structure and microstructure, of polycrystalline LiF films grown by thermal evaporation on amorphous and crystalline substrates are discussed, together with their influence on colour centres formation induced by low-energy electron beam bombardment and on the choice of the main irradiation conditions.

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Texture Analysis of LiF Thin Films Evaporated onto Amorphous Substrates at Different Temperatures

Cited by 13 publications

References 9 publications

LiF Nanoparticles Enhance Targeted Degradation of Organic Material under Low Dose X-ray Irradiation

LiF Nanoparticles Enhance Targeted Degradation of Organic Material under Low Dose X-ray Irradiation

Structural Control of Lithium Fluoride Thin Films

Micro and sub‐micro fabrication techniques for optically confined structures based on lithium fluoride

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