Freely Suspended Platinum Diselenide Membranes without Polymer Support for Piezoresistive Pressure Sensing.

Platinum diselenide (PtSe 2 ) is a layered two-dimensional (2D) material with outstanding electronic and piezoresistive properties ^[1]–[3] . It has demonstrated its potential for membrane-based pressure sensor devices, where poly(methyl methacrylate) (PMMA) supported and suspended the PtSe2 membranes ^[4] . The impact of the polymer support layer on the response of the suspended 2D material is still under investigation ^[5] . To study the strain and the piezoresistive behavior, we fabricated and analyzed devices based on suspended PtSe 2 membranes with and without polymer support.