Effect of ultraviolet radiation on polyethylene naphthalate films irradiated with high-energy heavy ions

Molokanova, L. G.; Kochnev, Yu. K.; Nechaev, A. N.; Chukova, S. N.; Apel, P. Yu.

doi:10.1134/s0018143917030109

Cited by 10 publications

(3 citation statements)

References 10 publications

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“…The emission is consists of two components, at 380 and 450 nm which correspond to the monomer and dimer respectably [28]. A series of recent studies of PEN [29] and its application to LAr experiments specifically [30] has generated interest in the efficacy of PEN as an alternative to TPB [31,32]. In this work we explore the relative WLS and optical performance of various samples of PEN-including reflectors, and compare these to the performance of a TPB-including reference sample in a LAr cryogenic environment, using 128 nm light from scintillation of the LAr itself.…”

Section: Introductionmentioning

confidence: 99%

Wavelength-Shifting Performance of Polyethylene Naphthalate Films in a Liquid Argon Environment

Abraham,

Asaadi,

Basque

et al. 2021

Preprint

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Liquid argon is commonly used as a detector medium for neutrino physics and dark matter experiments in part due to its copious scintillation light production in response to its excitation and ionization by charged particle interactions. As argon scintillation appears in the vacuum ultraviolet (VUV) regime and is difficult to detect, wavelength-shifting materials are typically used to convert VUV light to visible wavelengths more easily detectable by conventional means. In this work, we examine the wavelength-shifting and optical properties of poly(ethylene naphthalate) (PEN), a recently proposed alternative to tetraphenyl butadiene (TPB), the most widelyused wavelength-shifter in argon-based experiments. In a custom cryostat system with welldemonstrated geometric and response stability, we use 128 nm argon scintillation light to examine various PEN-including reflective samples' light-producing capabilities, and study the stability of PEN when immersed in liquid argon. The best-performing PEN-including test reflector was found to produce 34% as much visible light as a TPB-including reference sample, with widely varying levels of light production between different PEN-including test reflectors. Plausible origins for these variations, including differences in optical properties and molecular orientation, are then identified using additional measurements. Unlike TPB-coated samples, PEN-coated samples did not produce long-timescale light collection increases associated with solvation or suspension of wavelength-shifting material in bulk liquid argon.

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Section: Introductionmentioning

confidence: 99%

Wavelength-Shifting Performance of Polyethylene Naphthalate Films in a Liquid Argon Environment

Abraham,

Asaadi,

Basque

et al. 2021

Preprint

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“…The absorbances of PEN and laser-treated PEN were similar in the range of visible radiation. Typically, polymers with an aromatic core interact with UV radiation due to the presence of conjugated double bonds [ 45 , 46 ]. The absorbance of LIPSS/PEN slightly increases with decreasing wavelength due to the incorporation of new conjugated double bonds during laser modification.…”

Section: Resultsmentioning

confidence: 99%

Engineered Cu-PEN Composites at the Nanoscale: Preparation and Characterisation

et al. 2022

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As polymeric materials are already used in many industries, the range of their applications is constantly expanding. Therefore, their preparation procedures and the resulting properties require considerable attention. In this work, we designed the surface of polyethylene naphthalate (PEN) introducing copper nanowires. The surface of PEN was transformed into coherent ripple patterns by treatment with a KrF excimer laser. Then, Cu deposition onto nanostructured surfaces by a vacuum evaporation technique was accomplished, giving rise to nanowires. The morphology of the prepared structures was investigated by atomic force microscopy and scanning electron microscopy. Energy dispersive spectroscopy and X-ray photoelectron spectroscopy revealed the distribution of Cu in the nanowires and their gradual oxidation. The optical properties of the Cu nanowires were measured by UV-Vis spectroscopy. The sessile drop method revealed the hydrophobic character of the Cu/PEN surface, which is important for further studies of biological responses. Our study suggests that a combination of laser surface texturing and vacuum evaporation can be an effective and simple method for the preparation of a Cu/polymer nanocomposite with potential exploitation in bioapplications; however, it should be borne in mind that significant post-deposition oxidation of the Cu nanowire occurs, which may open up new strategies for further biological applications.

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Section: Introductionmentioning

confidence: 99%

Wavelength-shifting performance of polyethylene naphthalate films in a liquid argon environment

Abraham¹,

Asaadi²,

Basque³

et al. 2021

J. Inst.

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Liquid argon is commonly used as a detector medium for neutrino physics and dark matter experiments in part due to its copious scintillation light production in response to its excitation and ionization by charged particle interactions. As argon scintillation appears in the vacuum ultraviolet (VUV) regime and is difficult to detect, wavelength-shifting materials are typically used to convert VUV light to visible wavelengths more easily detectable by conventional means. In this work, we examine the wavelength-shifting and optical properties of poly(ethylene naphthalate) (PEN), a recently proposed alternative to tetraphenyl butadiene (TPB), the most widely-used wavelength-shifter in argon-based experiments. In a custom cryostat system with well-demonstrated geometric and response stability, we use 128 nm argon scintillation light to examine various PEN-including reflective samples' light-producing capabilities, and study the stability of PEN when immersed in liquid argon. The best-performing PEN-including test reflector was found to produce 34% as much visible light as a TPB-including reference sample, with widely varying levels of light production between different PEN-including test reflectors. Plausible origins for these variations, including differences in optical properties and molecular orientation, are then identified using additional measurements. Unlike TPB-coated samples, PEN-coated samples did not produce long-timescale light collection increases associated with solvation or suspension of wavelength-shifting material in bulk liquid argon.

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Effect of ultraviolet radiation on polyethylene naphthalate films irradiated with high-energy heavy ions

Cited by 10 publications

References 10 publications

Wavelength-Shifting Performance of Polyethylene Naphthalate Films in a Liquid Argon Environment

Wavelength-Shifting Performance of Polyethylene Naphthalate Films in a Liquid Argon Environment

Engineered Cu-PEN Composites at the Nanoscale: Preparation and Characterisation

Wavelength-shifting performance of polyethylene naphthalate films in a liquid argon environment

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