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RISS 인기검색어
- 검색키워드
- 저자 : Falconi, C. (검색결과 3 건)
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Piezoelectric properties in two-dimensional materials: Simulations and experiments
Hinchet, Ronan,Khan, Usman,Falconi, Christian,Kim, Sang-Woo Elsevier 2018 Materials today Vol.21 No.6
<P><B>Abstract</B></P> <P>The piezoelectric effect, discovered in 1880 by Jacques and Pierre Curie, effectively allows to transduce signals from the mechanical domain to the electrical domain and vice versa. For this reason, piezoelectric devices are already ubiquitous, including, for instance, quartz oscillators, mechanical actuators with sub-atomic resolution and microbalances. However, the ability to synthesize two-dimensional (2D) materials may enable the fabrication of innovative devices with unprecedented performance. For instance, many materials which are not piezoelectric in their bulk form become piezoelectric when reduced to a single atomic layer; moreover, since all the atoms belong to the surface, piezoelectricity can be effectively engineered by proper surface modifications. As additional advantages, 2D materials are strong, flexible, easy to be co-integrated with conventional integrated circuits or micro-electromechanical systems and, in comparison with bulk or quasi-1D materials, easier to be simulated at the atomistic level. Here, we review the state of the art on 2D piezoelectricity, with reference to both computational predictions and experimental characterization. Because of their unique advantages, we believe 2D piezoelectric materials will substantially expand the applications of piezoelectricity.</P> <P><B>Graphical abstract</B></P> <P>We review the state of the art on two-dimensional (2D) piezoelectricity, with reference to both computational predictions and experimental characterization. Because of their unique advantages, we believe 2D piezoelectric materials will substantially expand the applications of piezoelectricity.</P> <P>[DISPLAY OMISSION]</P>
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Self-powered transparent flexible graphene microheaters
Khan, U.,Kim, T.H.,Lee, K.H.,Lee, J.H.,Yoon, H.J.,Bhatia, R.,Sameera, I.,Seung, W.,Ryu, H.,Falconi, C.,Kim, S.W. Elsevier 2015 Nano energy Vol.17 No.-
Transparent and flexible (TF) microheaters are required in wearable devices, labs-on-chip, and micro-reactors. Nevertheless, conventional microheaters are rigid or opaque or both. Moreover, the resistances of conventional metallic microheaters are too low to be effectively powered by wearable energy harvesters. Here, we demonstrate the first TF microheaters by taking advantage of chemical vapor deposition (CVD)-grown graphene heating tracks and of a hexagonal boron nitride (h-BN) sheet for passivation; the h-BN sheet increases the maximum temperature by ~80%. Our TF microheaters show excellent temperature uniformity and can reach temperatures above 200<SUP>o</SUP>C in just 4s, with power consumption as low as 39mW. Additionally, since the CVD-graphene sheet resistance is orders of magnitude higher than that of typical metallic heaters, our devices can be effectively powered by wearable energy harvesters. As a proof-of-concept, we demonstrate the first self-powered, wearable microheater which achieves a temperature increase of 8<SUP>o</SUP>C when operated by a sound driven textile-based triboelectric nanogenerator. This is a key milestone towards next generation microheaters with applications in portable/wearable personal electronics, wireless health, and remote and mobile environmental sensors.
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