Browsing by Author "Maswoud , S."

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    3-D Printing of Flexible Two Terminal Electronic Memory Devices
    (Materials Research Society, 2018-01-10) Salaoru, Iulia; Paul, Shashi; Maswoud , S.
    Recent strategy in the electronics sector is to ascertain the ways to make cheap, flexible and environmentally friendly electronic devices. The 3D inkjet printing technology is based on the Additive Manufacturing concept and it is with no doubt capable of revolutionising the whole system of manufacturing electronic devices including: material selection; design and fabrication steps and device configuration and architecture. Thus, 3D inkjet printing technology (IJP) is not only one of the most promising technologies to reduce the harmful radiation/ heat generation but also achieve reductions in manufacturing cost. Here, we explore the potential of 3D – inkjet printing technology to provide an innovative approach for electronic devices in especially information storage elements by seeking to manufacture and characterise state-of-art fully inkjet printed two terminal electronic memory devices. In this work, ink-jettable materials (Ag and PEDOT:PSS) were printed by a piezoelectric Epson Stylus P50 inkjet printing machine on a flexible substrate. All components of the memory cells of a simple metal/active layer/metal structure were deposited via inkjet printing. The quality of the printed layers was first assessed by Nikon LABOPHOT-2 optical microscope, fitted with Nikon Camera DS-Fi1. Furthermore, an in-depth electrical characterisation of the fabricated memory cells was carried out using HP4140B picoammeter.
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    Inkjet printing of functional materials: a step forward to green electronics
    (2018-09) Salaoru, Iulia; Paul, Shashi; Maswoud , S.
    Nowadays the environmental impact of both used materials and manufacturing process of thin films is a major issue. The usage, storage, disposal protocol and the volume of waste material are also an environmental concern using conventional manufacturing pathway. The current technology to fabricate thin films requires heat generation in a deposition process and hence generation of harmful chemicals/radiation. Additionally, there are environmental limitations, for example, high vacuum equipment requires enormous amounts of electricity, thus creating a larger carbon footprint. Inkjet printing technology is a reliable alternative to traditional manufacturing protocol and most importantly, it is a solution to minimise the deleterious effects on the environment and human health. Here, we explore the potential of Additive Layer Manufacturing – inkjet printing technology to provide an innovative manufacturing pathway for functional materials, both conductive and insulating patterns, on flexible bendable substrates. In this work, ink-jettable materials were printed by a piezoelectric Epson Stylus P50 inkjet printing machine on a flexible substrate. The morphology, surface profile and the thickness uniformity of printed multi-layers were evaluated via Nikon LABOPHOT-2 optical microscope, fitted with Nikon Camera DS-Fi1. Furthermore, the conductivity and its dependency on the number of layers is investigated in this study. Even more, adhesion profile of the ink to the substrate and mechanical flexibility is also studied.