Have you ever thought about the earth 30th century?

Nowdays, earth has many problem because of reckless development. For this reason, I thought of earth in the future and I designed my artistic vision of it in the 30th century. This design is little bit extreme, but consider structure an aesthectic shape.

Sound-driven power generation using nanogenerators based on piezoelectric ZnO nanowires has been demonstrated. Systematic investigations on the power-generating performance of sound-driven nanogenerators clearly support that the measured output voltage originated from the sound-driven nanogenerator. This study shows that sound can be one of promising energy sources when using highly efficient nanogenerators based on piezoelectric nanowires.

In this talk, fully transparent, flexible (TF) charge generating piezoelectric nanodevices that are operated by external mechanical forces will be presented. By controlling the density of the seed layer for ZnO nanorod growth, transparent ZnO nanorod arrays were grown on TF indium tin oxide (ITO)/polyether sulfone (PES) films, and a TF conductive electrode was stacked on the ZnO nanorods. The resulting integrated TF nanodevice (having transparency exceeding 70 %) generated a noticeable current when it was pushed by application of an external load. The output current density was clearly dependent on the force applied. Furthermore, the output current density depended strongly on the morphology and the work function of the top electrode. A ZnO nanodevice with an embossed PdAu top electrode gave the highest output current density, of approximately 10 mA/cm2 at a load of 0.9 kgf. When a TF ITO/PES thin film with no corrugations was applied to the top electrode of the integrated nanodevice, the output current density fell to 1 mA/cm2; this is still sufficient for use as a self-powered pressure sensor. Our TF piezoelectric charge generator has clear potential for use in self-powered applications such as touch sensors or robot skins.

Sang-Woo Kim Professor
School of Materials Science& Engineering,
Sungkyunkwan University

Advanced Materials

SOS 2008-2009 – Haptic social network
With Carnaven Chiu, Xiao Xiao, and Pei-Yu (Peggy) Chi

Stress OutSourced (SOS) is a peer-to-peer network that allows anonymous users to send each other therapeutic massages to relieve stress. By applying the emerging concept of crowdsourcing to haptic therapy, SOS brings physical and affective dimensions to our already networked lifestyle while preserving the privacy of its members. SOS is an exploration and illustration of a new field of haptic social networking.

Key Won Chung

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