Publication

Alpha particle fluence-dependent physico-chemical properties of polycarbonate (Makrofol) surface after electrochemical etching

2025

Abstract

The optical properties of polycarbonate (Makrofol) samples are investigated under alpha irradiation with 2 MeV energy at various fluences ranging from of 103 to 106 alpha/cm2, following the electrochemical etching (ECE). Several microanalyses are carried out to characterize the optical, chemical, and structural properties of the samples, including field emission scanning electron microscopy (FESEM), UV-visible absorption spectroscopy, Photoluminescence (PL) spectroscopy, and BET analysis. Surface features and functionalities are further assessed by X-ray photoelectron spectroscopy (XPS) and attenuated total reflectance/Fourier transform infrared (ATR-FTIR) spectroscopy. Additionally, surface wettability is examined through contact angle measurements. Image processing of micrographs obtained from FESEM is utilized to determine track density, induced micro-hole diameter, and corresponding depth. Finally, machine learning (ML) is employed to accurately predict unknown patterns induced by the combined alpha irradiation and ECE. Specifically, k-nearest neighbors (KNN) classification with Bayesian optimization is used to identify alpha fluence levels with 90.1 % accuracy.

Official source

https://infoscience.epfl.ch/entities/publication/6331ebfc-8b92-49fd-8f98-f87c3edde870

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2025

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/6331ebfc-8b92-49fd-8f98-f87c3edde870

About this result

Related concepts (32)

Alpha decay

Alpha decay or α-decay is a type of radioactive decay in which an atomic nucleus emits an alpha particle (helium nucleus) and thereby transforms or 'decays' into a different atomic nucleus, with a mass number that is reduced by four and an atomic number that is reduced by two. An alpha particle is identical to the nucleus of a helium-4 atom, which consists of two protons and two neutrons. It has a charge of +2e and a mass of 4Da. For example, uranium-238 decays to form thorium-234.

X-ray photoelectron spectroscopy

X-ray photoelectron spectroscopy (XPS) is a surface-sensitive quantitative spectroscopic technique based on the photoelectric effect that can identify the elements that exist within a material (elemental composition) or are covering its surface, as well as their chemical state, and the overall electronic structure and density of the electronic states in the material. XPS is a powerful measurement technique because it not only shows what elements are present, but also what other elements they are bonded to.

Absorption spectroscopy

Absorption spectroscopy refers to spectroscopic techniques that measure the absorption of electromagnetic radiation, as a function of frequency or wavelength, due to its interaction with a sample. The sample absorbs energy, i.e., photons, from the radiating field. The intensity of the absorption varies as a function of frequency, and this variation is the absorption spectrum. Absorption spectroscopy is performed across the electromagnetic spectrum.

Related publications (1)

Alpha particle fluence-dependent physico-chemical properties of polycarbonate (Makrofol) surface after electrochemical etching

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