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Related Experiment Video

Updated: May 28, 2026

Preparation of ZnO Nanorod/Graphene/ZnO Nanorod Epitaxial Double Heterostructure for Piezoelectrical Nanogenerator by Using Preheating Hydrothermal
10:39

Preparation of ZnO Nanorod/Graphene/ZnO Nanorod Epitaxial Double Heterostructure for Piezoelectrical Nanogenerator by Using Preheating Hydrothermal

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Self-connected and habitually tilted piezoelectric nanorod array.

Hak Ki Yu1, Jeong Min Baik, Jong-Lam Lee

  • 1Division of Advanced Materials Science and Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang, 790-784, Korea.

ACS Nano
|October 22, 2011
PubMed
Summary

This study presents a novel, self-connected zinc oxide nanorod array that easily bends. This unique structure enables controlled current direction and level through piezoelectric effects under normal force.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Solid-State Physics

Background:

  • Fabrication of vertically aligned zinc oxide nanorods (ZnO NRs) typically requires complex patterning for interconnections.
  • Existing ZnO NR arrays often lack mechanical flexibility, limiting their applications in flexible electronics.
  • Piezoelectric properties of ZnO NRs offer potential for energy harvesting and sensing applications.

Purpose of the Study:

  • To develop a self-connected and habitually tilted ZnO nanorod array without patterning.
  • To investigate the effect of substrate-induced tilting on the mechanical bending of ZnO NRs.
  • To explore the piezoelectric potential gradient and its influence on current control in the tilted NR array.

Main Methods:

  • Growth of vertically well-aligned ZnO NRs on MgO-buffered C-plane sapphire using a strain relaxation process.

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Last Updated: May 28, 2026

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10:39

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Published on: January 15, 2016

A Polymer-based Piezoelectric Vibration Energy Harvester with a 3D Meshed-Core Structure
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  • Utilizing the epitaxial ZnO wetting layer as a self-connecting layer for the nanorods.
  • Characterization of the habitual tilting angle and its correlation with substrate step-terrace structures.
  • Measurement of piezoelectric potential, electrical field, and current response under normal force application.

    • Main Results:

    • Successfully fabricated a self-connected ZnO nanorod array with a habitual tilt angle of approximately 0.2°.
    • Demonstrated easy bending of the ZnO NRs by normal force due to substrate-induced tilting.
    • Observed an unsymmetrical strain leading to a piezoelectric potential gradient and lateral electrical field.
    • Achieved controlled current direction and level (approx. 0.1 μA/cm² at 2 kgf normal force).

    Conclusions:

    • The developed method provides a patterning-free approach for self-connected ZnO nanorod arrays.
    • The habitually tilted structure facilitates mechanical bending and enables piezoelectric potential control.
    • This work presents a promising route for flexible piezoelectric nanodevices and sensors.