期刊
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
卷 29, 期 10, 页码 893-897出版社
JOURNAL MATER SCI TECHNOL
DOI: 10.1016/j.jmst.2013.07.005
关键词
Piezoelectric ZnO nanostructures; Chemical solution method; Thermal-oxidation; Power-generator
资金
- National Science Council of the Republic of China, Taiwan [NSC 101-2218-E-539-001, NSC 102-2623-E-539-001-ET]
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 1 h. By varying the mixture-ratio of Zn micro-particles in an oxalic acid solution with 0.75 mol/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 0.28 mu A cm(-2) generated by a power-generator under an ultrasonic wave is observed.
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