Development of a PMN-PT/PDMS Vibrational Energy Harvester

Kee S. Moon, Alex Mathers, Jingang Yi

Research output: Contribution to journalConference article

2 Scopus citations


Improving the energy conversion efficiency is one critical factor for practical usage of vibrational energy harvesting devices. In this paper, we design and prototype a vibration-based energy harvester with a high output energy density. The proposed harvester is based on a composite cantilever beam-mass design. The cantilever beam is made of a high piezoelectric constant, lead magnesium niobáte-lead titanate (PMN-PT) material. A polydimethylsiloxane (PDMS) coating is applied to the cantilevers to decrease stress concentration of the thin PMN-PT and therefore increase the strength of the cantilever. A PDMS proof mass is also added to decrease the natural frequency of the cantilever system and to increase displacement and the voltage output. It is found that a 7.4 mm PMN-PT cantilever with a PDMS coating and proof mass produces a sustained 0.7 mW of RMS power (16.8 V, 58 μA) at an acceleration of 55 m/s 2.

Original languageEnglish (US)
Article number72660V
JournalProceedings of SPIE - The International Society for Optical Engineering
StatePublished - Dec 1 2008
EventOptomechatronic Technologies 2008 - San Diego, CA, United States
Duration: Nov 17 2008Nov 19 2008

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


  • Energy harvesting
  • PMN-PT
  • Piezoelectricity
  • Vibration

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