| Summary: | In this work, hydrochloric acid (HCl)-doped molybdenum ditelluride (MoTe<sub>2</sub>) nanosheets/polyaniline (PANI) nanofiber composites are prepared by in situ chemical oxidation polymerization, and then the composites are deposited on interdigital electrodes (IDEs) to fabricate a NH<sub>3</sub> gas sensor. Morphological analysis of the composites reveals that the PANI fibers are deposited on 2D MoTe<sub>2</sub> sheets, showing a porous mesh microstructure structure with a more continuous distribution of PANI layer. FTIR spectrum analysis indicates the interaction between the MoTe<sub>2</sub> nanosheets and the PANI in the MoTe<sub>2</sub>/PANI composites. The results demonstrate that the as-prepared MoTe<sub>2</sub>/PANI composites exhibit higher response than the pure PANI, in particular, the 8 wt.% MoTe<sub>2</sub>/PANI composites display about 4.23 times enhancement in response value toward 1000 ppm NH<sub>3</sub> gas compared with the pure PANI. The enhanced NH<sub>3</sub> gas-sensitive properties may be due to the increasing surface area of MoTe<sub>2</sub>/PANI composite films and the possible interaction of the P-N heterojunctions formed between PANI and the 2H-MoTe<sub>2</sub> nanosheets.
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