Single-walled and multiwalled molybdenum disulfide (MoS2) nanotubes have been coaxially synthesized on small-diameter boron nitride nanotubes (BNNTs) which might be obtained from eradicating single-walled carbon nanotubes (SWCNTs) in heteronanotubes of SWCNTs coated by BNNTs. The photoluminescence (PL) from single-walled MoS2 nanotubes supported by core BNNTs is noticed on this work, which evidences the direct bandgap construction of single-walled MoS2 nanotubes with a diameter round 6−7 nm. The remark is in line with our DFT outcomes that the single-walled MoS2 nanotube modifications from an indirect-gap to a direct-gap semiconductor when the diameter of a nanotube is greater than round 5.2 nm. Then again, when there are SWCNTs contained in the heteronanotubes of BNNTs and single-walled MoS2 nanotubes, the PL sign from MoS2 nanotubes is significantly quenched. The cost switch and vitality switch between SWCNTs and single-walled MoS2 nanotubes had been examined by characterizations by PL, X-ray photoelectron spectroscopy, and Raman spectroscopy. Furthermore, the PL sign from multiwalled MoS2 nanotubes is considerably quenched. Single-walled and multiwalled MoS2 nanotubes exhibit totally different Raman options in each resonant and nonresonant Raman spectra.