“…MoO 2 is a wide-band gap semiconductor with metallic electronic property, which has a wide applications in field emission, 21,22 supercapacitors, 23,24 lithium ion batteries, 25,26 cataly, 27,28 biosensing, 29 etc. Up to now, all kinds of MoO 2 and its composite nanostructure such as nanowire, 22 nanorod, 23,24 nanostar, 21 nanosphere, 25 nanoparticle, 27,29 MoS 2 /MoO 2 plate, 30 and MoO 2 /C nanosheet have been fabricated. 26 However, very few papers reported on monodispersity of ultrathin MoO 2 nanosheets.…”