MoS2 based nanomechanical bolometer for combined radiation sensing and the estimation of material properties

Two-dimensional material-based bolometer sensors have unique optoelectronic properties. Here, a transparent and flexible bolometer and photodetector, based on MoS2 is presented which measures radiation intensity via mechanical transduction and band gap transition. Three different cavity dimensions are fabricated to understand its effect on the bolometer performance. The fabricated devices are used to estimate the gauge factor (GF) and absorption coefficient of the material from the valley and peak data of current-time curves. The GF of 100 and absorption coefficient of $2 \times 10^{6} \mathrm{~cm}^{-1}$ is obtained for the MoS2 on PDMS device. The work presented here is highly encouraging for the utilization of MoS2 & PDMS in bolometers, thermal sensors and photodetectors.