Rapid synthesis of piezoelectric ZnO-nanostructures for micro power-generators

Nai Feng Hsu, Tien-Kan Chung, Ming Chang*, Hong Jun Chen

*Corresponding author for this work

Research output: Contribution to journalArticle

9 Scopus citations

Abstract

In this paper, we report a rapid synthesis of piezoelectric ZnO-nanostructures and fabrication of the nanostructures-based power-generators demonstrating an energy conversion from an environmental mechanical/ultrasonic energy to an electrical energy. The ZnO nanostructures are grown on a silicon wafer by a modified chemical solution method (CSD, chemical-solution-deposition) with a two-step thermal-oxidation approach. The synthesis process can be completed within 1h. By varying the mixture-ratio of Zn micro-particles in an oxalic acid solution with 0.75mol/l concentration in the CSD process, the growth mechanism is well-controlled to synthesize three different types of ZnO-nanostructures (i.e., dandelion-like nanostructures, columnar nanostructures, and nanowires). Furthermore, through oxidizing at different temperatures in the thermal-oxidation process, the featured geometry of the nanostructures (e.g., the length and diameter of a nanowire) is modified. The geometry, size, morphology, crystallization, and material phase of the modified nanostructures are characterized by scanning electron microscopy and X-ray diffraction. Finally, the nanostructures are used to fabricate several micro power-generators. Through the piezoelectric effect, a maximum current density output of 0.28μAcm-2 generated by a power-generator under an ultrasonic wave is observed.

Original languageEnglish
Pages (from-to)893-897
Number of pages5
JournalJournal of Materials Science and Technology
Volume29
Issue number10
DOIs
StatePublished - 1 Oct 2013

Keywords

  • Chemical solution method
  • Piezoelectric ZnO nanostructures
  • Power-generator
  • Thermal-oxidation

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