Solution-processed negative gauge factor PtSe₂ strain sensors.

ABSTRACT: We undertake electrochemical exfoliation of a 2D semiconductor platinum diselenide, PtSe₂ and investigate the piezoresistance response of a solution-processed network. Due to the large PtSe₂ aspect ratios, exceeding 300, we achieve conformal flake-to-flake junctions and good inter-flake electrical coupling. Our measured piezoresistive gauge factor is negative (-5.45), consistent with the intrinsic negative gauge factor of PtSe₂. This negative network gauge factor implies that strain is transferred from the substrate to the nanosheets. However, detailed modelling shows that the strain transferred to the nanosheets is much smaller than the applied strain, showing that conformal junctions do not necessarily lead to good mechanical coupling between nanosheets.

SUBMITTER: Ilhan C 

PROVIDER: S-EPMC12281280 | biostudies-literature | 2025 Aug

REPOSITORIES: biostudies-literature