Low energy Ar + ion irradiation induced surface modification in cadmium zinc telluride (CdZnTe)

Applied Surface Science

Hosinski

et al. 2016

The present study reports on high-flux, low-energy He + ion irradiation as a novel method of enhancing the surface porosity and surface area of naturally oxidized niobium (Nb). Our study shows that ion-irradiation-induced Nb surface micro-and nano-structures are highly tunable by varying the target temperature during ion bombardment. Mirrorpolished Nb samples were irradiated with 100 eV He + ions at a flux of 1.2×10 21 ions m-2 s-1 to a total fluence of 4.3×10 24 ions m-2 with simultaneous sample annealing in the temperature range of 773-1223 K to demonstrate the influence of sample temperature on the resulting Nb surface morphology. This surface morphology was primarily characterized using field-emission scanning electron microscopy (FE-SEM) and atomic force microscopy (AFM). Below 923 K, Nb surfaces form nano-scale tendrils and exhibit significant increases in surface porosity. Above 923 K, homogeneously populated nano-pores with an average diameter of ~60 nm are observed in addition to a smaller population of sub-micron sized pores (up to ~230 nm in diameter). Our analysis shows a significant reduction in surface pore number density and surface porosity with increasing sample temperature. High-resolution ex-situ X-ray photoelectron spectroscopy (XPS) shows Nb 2 O 5 phase in all of the ion-irradiated samples. To further demonstrate the length scales in which radiation-induced surface roughening occurs,

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Section: Experimental Methodsmentioning

confidence: 99%

Temperature-dependent surface porosity of Nb2O5 under high-flux, low-energy He+ ion irradiation

Applied Surface Science

Hosinski

et al. 2016

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“…The experiments have been performed at the surface characterization laboratories UHFI (ultra-high flux irradiation) and IMPACT (interaction of materials with particles and components testing) [41] of the center for materials under extreme environment (CMUXE) at Purdue University. Cold rolled Mo sheets having purity of 99.95% and thickness of 0.5 mm have been used for these experiments.…”

Section: Experimental Conditionsmentioning

confidence: 99%

Temperature dependent surface modification of molybdenum due to low energy He+ ion irradiation

Journal of Nuclear Materials

Joseph

et al. 2015

“…Corresponding high-resolution FE-SEM images are also shown for reference. All spectra were resolved into their respective components by a mixed Gaussian-Lorentzian (GL, m = 30) line shape (where m = 0 is pure Gaussian and m = 100 is pure Lorentzian) using commercial Casa-XPS peak-fitting software [43]. For all high-resolution XPS spectra, the major fitting parameters, binding energy (BE) and full width at half maxima (FWHM) are summarized in Table 1.…”

Section: X-ray Photoelectron Spectroscopy (Xps) Studiesmentioning

confidence: 99%

Tailoring molybdenum nanostructure evolution by low-energy He+ ion irradiation

Applied Surface Science

Hassanein

2015