Publications by authors named "S Christopoulos"

We investigate a method for fabricating layers that exhibit both high optical absorption and promising thermoelectric properties. Using plasma-enhanced chemical vapor deposition (PECVD), amorphous Si and SiGe layers are deposited on glass substrates and subsequently processed via laser annealing to achieve nanostructured layers. Our results show that a single laser annealing pulse at 40 mJ yields the highest power factor, approximately 90 μW/m·K.

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A woman in her 70s with metastatic melanoma presenting with refractory hypokalaemia on combined immune checkpoint inhibitors, nivolumab-ipilimumab, was diagnosed with adrenocorticotropic hormone (ACTH)-dependent hypercortisolism 11 weeks following the initiation of her immunotherapy. Investigations also demonstrated central hypothyroidism and hypogonadotropic hypogonadism. She underwent imaging studies of her abdomen and brain which revealed normal adrenal glands and pituitary, respectively.

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The optical response, lithium doping, and charge transfer in three Sn-based existing MSnC MAX phases with electron localization function (ELF) were investigated using density functional theory (DFT). Optical calculations show a slight optical anisotropy in the spectra of different optical parameters in some energy ranges of the incident photons. The peak height is mostly slightly higher for the polarization ⟨001⟩.

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Article Synopsis
  • - The paper discusses recent research on the development of low-cost materials for efficient sensors and energy devices, focusing on the effects of halogen doping on tin dioxide (SnO) to improve functionality.
  • - It utilizes Density Functional Theory (DFT) calculations to analyze how halogen doping modifies the electronic properties, defect processes, and structures of SnO, leading to a reduced bandgap and enhanced gas-sensing performance.
  • - The findings reveal that halogen doping serves as an effective and economical approach to significantly boost the performance of SnO at room temperature, offering insights into potential applications in sensors and renewable energy technologies.
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Here we employed the density functional theory calculations to investigate some physical properties of first Sc-based MAX phase ScSnC including defect processes to compare with those of existing MSnC phases. The calculated structural properties are in good agreement with the experimental values. The new phase ScSnC is structurally, mechanically and dynamically stable.

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