  In this Letter we demonstrate the operation of an analog small-signal
amplifier based on single-layer MoS2, a semiconducting analogue of graphene.
Our device consists of two transistors integrated on the same piece of
single-layer MoS2. The high intrinsic band gap of 1.8 eV allows MoS2-based
amplifiers to operate with a room temperature gain of 4. The amplifier
operation is demonstrated for the frequencies of input signal up to 2 kHz
preserving the gain higher than 1. Our work shows that MoS2 can effectively
amplify signals and that it could be used for advanced analog circuits based on
two-dimensional materials.

Mesoscale and Nanoscale Physics;Materials Science