Ms. Angela E. Pimentel Profile

Angela E. Pimentel

at Univ de Aveiro

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Author

Publications (2)

Proceedings Article | 22 June 2011 Paper

Away from silicon era: the paper electronics

R. Martins, B. Brás, I. Ferreira, L. Pereira, P. Barquinha, N. Correia, R. Costa, T. Busani, A. Gonçalves, A. Pimentel, E. Fortunato

Proceedings Volume 7940, 79400P (2011) https://doi.org/10.1117/12.879520

KEYWORDS: Transistors, Electronics, Thin films, Electrodes, Capacitance, Oxides, Humidity, Scanning electron microscopy, Electronic components, Prototyping

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Today there is a strong interest in the scientific and industrial community concerning the use of biopolymers for electronic applications, mainly driven by low-cost and disposable applications. Adding to this interest, we must recognize the importance of the wireless auto sustained and low energy consumption electronics dream. This dream can be fulfilled by cellulose paper, the lightest and the cheapest known substrate material, as well as the Earth's major biopolymer and of tremendous global economic importance. The recent developments of oxide thin film transistors and in particular the production of paper transistors at room temperature had contributed, as a first step, for the development of disposable, low cost and flexible electronic devices. To fulfil the wireless demand, it is necessary to prove the concept of self powered devices. In the case of paper electronics, this implies demonstrating the idea of self regenerated thin film paper batteries and its integration with other electronic components. Here we demonstrate this possibility by actuating the gate of paper transistors by paper batteries. We found that when a sheet of cellulose paper is covered in both faces with thin layers of opposite electrochemical potential materials, a voltage appears between both electrodes -paper battery, which is also self-regenerated. The value of the potential depends upon the materials used for anode and cathode. An open circuit voltage of 0.5V and a short-circuit current density of 1μA/cm² were obtained in the simplest structure produced (Cu/paper/Al). For actuating the gate of the paper transistor, seven paper batteries were integrated in the same substrate in series, supplying a voltage of 3.4V. This allows proper ON/OFF control of the paper transistor. Apart from that transparent conductive oxides can be also used as cathode/anode materials allowing so the production of thin film batteries with transparent electrodes compatible with flexible, invisible, self powered and wireless electronics.

Proceedings Article | 5 March 2007 Paper

Usability in virtual and augmented environments: a qualitative and quantitative study

Paulo Dias, Angela Pimentel, Carlos Ferreira, Frank van Huussen, Jan-Willem Baggerman, Pauline van der Horst, Joaquim Madeira, Rafael Bidarra, Beatriz Sousa Santos

Proceedings Volume 6490, 64901I (2007) https://doi.org/10.1117/12.703878

KEYWORDS: Virtual reality, Augmented reality, Head-mounted displays, Cameras, Visualization, Data modeling, 3D modeling, Statistical analysis, Video, Lung

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