1,721,065 research outputs found
Ion and electron beam deposited masks for pattern transfer by reactive ion etching
No full textWe report on the use of a carbon-rich Pt-based material, obtained by electron and ion beam assisted deposition from metal-organic precursor, as a mask for pattern transfer processes. Thin and narrow mask patterns subjected to oxygen plasma and reactive ion etching (RIE) of silicon in SF(6) were investigated by atomic force microscopy and energy dispersive X-ray analysis. As for the masks obtained by electron beam assisted deposition, both the pattern and the surrounding halo were found to be etched in oxygen plasma. In contrast, the pattern deposited by assist of ion beam was basically unaffected, likely due to implanted Ga(+) ions during deposition, while the surrounding halo was found to be appreciably thinned. Masks having thickness as low as few nanometers sustained successfully a 200 nm RIE step, producing structures with sub-100 nm size. Mask stripping was achieved in Piranha bath. (C) 2011 Elsevier B.V. All rights reserved
Ion beam assisted processes for Pt nanoelectrode fabrication onto 1-D nanostructures
No full textWe present morphological and electrical characterizations of thin and narrow resistors obtained by focused ion beam assisted deposition of Pt based material. For thin and narrow depositions the measured thickness and width are significantly different from the nominal values. From leakage tests we found that in order to have electrically insulated parallel resistors at room temperature, it is mandatory that the Pt-halo, which results from the deposition procedure, has a thickness well below 6 nm. (C) 2008 Elsevier Ltd. All rights reserved
Morphological and spectroscopic analysis of argon- and oxygen-ions treated thin ferritin films
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ZnO nanostructures and electrospun ZnO–polymeric hybrid nanomaterials in biomedical, health, and sustainability applications
Full text linkZnO-based nanomaterials are a subject of increasing interest within current research, because of their multifunctional properties, such as piezoelectricity, semi-conductivity, ultraviolet absorption, optical transparency, and photoluminescence, as well as their low toxicity, biodegradability, low cost, and versatility in achieving diverse shapes. Among the numerous fields of application, the use of nanostructured ZnO is increasingly widespread also in the biomedical and healthcare sectors, thanks to its antiseptic and antibacterial properties, role as a promoter in tissue regeneration, selectivity for specific cell lines, and drug delivery function, as well as its electrochemical and optical properties, which make it a good candidate for biomedical applications. Because of its growing use, understanding the toxicity of ZnO nanomaterials and their interaction with biological systems is crucial for manufacturing relevant engineering materials. In the last few years, ZnO nanostructures were also used to functionalize polymer matrices to produce hybrid composite materials with new properties. Among the numerous manufacturing methods, electrospinning is becoming a mainstream technique for the production of scaffolds and mats made of polymeric and metal-oxide nanofibers. In this review, we focus on toxicological aspects and recent developments in the use of ZnO-based nanomaterials for biomedical, healthcare, and sustainability applications, either alone or loaded inside polymeric matrices to make electrospun composite nanomaterials. Bibliographic data were compared and analyzed with the aim of giving homogeneity to the results and highlighting reference trends useful for obtaining a fresh perspective about the toxicity of ZnO nanostructures and their underlying mechanisms for the materials and engineering community
Valutazione della topografia superficiale di impianti macchinati ed impianti sabbiati e mordenzati.
No full textFunctionalization and photoelectrochemical characterization of poly[3-3'(vinylcarbazole)] multi-walled carbon nanotube (PVK-MWNT) Langmuir–Schaefer films
No full textSynthesis, fabrication and characterizatoin of poly[3-3'(vinylcarbazole)] (PVK) Langmuir-Schaefer films
No full textPoly[3-3’(vinylcarbazole)] (PVK) was synthetized with N-vinylcarbazole as monomer by oxidative polymerization with ferric chloride. The resulting polymer was then deposited on various solid supports by using Langmuir–Schaefer (LS) method. The pressure–area isotherm of PVK revealed the possibility of compact monolayer formation at air–water interface. Different layers of PVK were doped with iodine vapours. Both scanning probe microscopy and optical microscopy images indicated a good uniformity of the films. The morphology and the thickness of PVK films were investigated using atomic force microscopy. The voltammetric investigation of I2 doped PVK showed a distinctive electrochemical behaviour. The photoinduced charge transfer across a donor/acceptor (D/A) hybrid interface provided an effective method to study the photoelectrochemical properties of the composite LS films
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