Texture of ZnO thin films deposited through microwave irradiation

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Abstract

We report the crystallographic texture of ZnO thin films comprising nanorods grown by a microwave irradiation assisted method. Different substrates were used, namely Si, Ge, metal coated Si, PMMA coated Si and ITO coated glass, to examine the respective development of crystallographic texture. The films were characterized by Xray diffraction and scanning electron microscopy, while the texture analysis was done by Xray pole figure analysis using the Schultz reflection method. The ZnO film deposited on Si and Ge showed a mixed texture. On all the other substrates, c axis oriented ZnO films were obtained.

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Direct-current nanogenerator driven by ultrasonic waves.

X. Wang, J. Song, J. Liu … (2007)

We have developed a nanowire nanogenerator that is driven by an ultrasonic wave to produce continuous direct-current output. The nanogenerator was fabricated with vertically aligned zinc oxide nanowire arrays that were placed beneath a zigzag metal electrode with a small gap. The wave drives the electrode up and down to bend and/or vibrate the nanowires. A piezoelectric-semiconducting coupling process converts mechanical energy into electricity. The zigzag electrode acts as an array of parallel integrated metal tips that simultaneously and continuously create, collect, and output electricity from all of the nanowires. The approach presents an adaptable, mobile, and cost-effective technology for harvesting energy from the environment, and it offers a potential solution for powering nanodevices and nanosystems.