  Temperature coefficient of resistance (TCR) of a bolometer can be tuned by
modifying the thermal conductance of an absorbing materials since they sense
radiations via the temperature change in the absorber. However, the thermal
conductance of the absorber can be reduced by engineering the appropriate
thermal isolation, which can be an ultimate solution towards making a highly
sensitive thermal detector. Here, we have developed an atomically thin 2D
bolometer detector made up of a mechanically transferred suspended
multilayer-MoS2 flake, eliminating the use of challenging thin-film fabrication
process. The strength of our detector lies on the two factors: its large
surface-to-volume window to absorb the radiations; the suspended configuration
which prevents the heat dissipation through the substrate and therefore reduces
the thermal conductance. The bolometric response of the detector is tested in
both modes, via the photoresponse and the thermal response. The prototype is
found to exhibit a very high TCR ~ -9.5%/K with the least achievable thermal
noise-equivalent power (NEP) ~ 0.61 pWHz-1/2, in ambient conditions at 328 K.
