Table 4.

Summary of recent reported tunable membrane-based energy harvesters.

Reference	Year	Methods
Mo et al.[156]	2014	Pressure
Palosaari et al.[157]	2014
Wang et al.[158]	2011	Multiple structure
Rezaeisaray et al.[159]	2015	Nonlinear (stiffness)
Dogheche et al.[162]	2005	Nonlinear (bistable)
Dong et al.[160]	2016	Bias voltage
Dong et al.[161]	2016	Mechanical Stretch