Ultrahigh sensitivity and layer-dependent sensing performance of phosphorene-based gas sensors

Two-dimensional (2D) layered materials have attracted significant attention for device applications because of their unique structures and outstanding properties. Here, a field-effect transistor (FET) sensor device is fabricated based on 2D phosphorene nanosheets (PNSs). The PNS sensor exhibits an ultrahigh sensitivity to NO2 in dry air and the sensitivity is dependent on its thickness. A maximum response is observed for 4.8-nm-thick PNS, with a sensitivity up to 190% at 20 parts per billion (p.p.b.) at room temperature. First-principles calculations combined with the statistical thermodynamics modelling predict that the adsorption density is ∼10(15) cm(-2) for the 4.8-nm-thick PNS when exposed to 20 p.p.b.…

• NS
  National Science Foundation

  Awards: IIP-1128158, DMR-1121262, DE-AC02-06CH11357, 1121262, 1128158
• UD
  U.S. Department of Energy

  Awards: AC02-06CH11357, Contract No. DE-AC02-06CH11357, DE-AC02, 06CH11357, No. DE-AC02-06CH11357, DE-AC02-06CH11357, DE-AC02-
• UO
  University of Wisconsin-Milwaukee
• NU
  Northwestern University

  Awards: DE-AC02-06CH11357, DMR-1121262
• OO
  Office of Science

  Awards: DE-AC02-06CH11357, Contract No. DE-AC02-06CH11357, DE-AC02, No. DE-AC02-06CH11357, 06CH11357, AC02-06CH11357
• MR
  Materials Research Science and Engineering Center, Harvard University

  Award: DMR-1121262
• ND
  National Defense Science and Engineering Graduate

  Awards: 32 CFR 168a, CFR 168a
• OO
  Office of Naval Research

  Awards: DE-AC02-06CH11357, DMR-1121262, 32 CFR 168a, N00014-14-1-0669, N00014
• DO
  Division of Materials Research

  Awards: DMR-1121262, DE-AC02-06CH11357, 1121262
• BE
  Basic Energy Sciences

  Awards: DE-AC02, Contract No. DE-AC02-06CH11357, AC02-06CH11357, 06CH11357
• AN
  Argonne National Laboratory

  Awards: DE-AC02, No. DE-AC02-06CH11357, 06CH11357, AC02-06CH11357, Contract No. DE-AC02-06CH11357