@article{0113b62f526c40b98226af0a904d0398,
title = "Ultrahigh sensitivity and layer-dependent sensing performance of phosphorene-based gas sensors",
abstract = "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 NO 2 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 1/410 15 cm '2 for the 4.8-nm-thick PNS when exposed to 20p.p.b. NO 2 at 300K. Our sensitivity modelling further suggests that the dependence of sensitivity on the PNS thickness is dictated by the band gap for thinner sheets (<10nm) and by the effective thickness on gas adsorption for thicker sheets (>10nm).",
author = "Shumao Cui and Haihui Pu and Wells, {Spencer A.} and Zhenhai Wen and Shun Mao and Jingbo Chang and Hersam, {Mark C.} and Junhong Chen",
note = "Funding Information: J.H.C. acknowledges the financial support by the National Science Foundation (IIP-1128158). H.H.P. acknowledges support from the University of Wisconsin–Milwaukee Dissertation Fellowship. S.A.W. acknowledges support from the DoD, Air Force Office of Scientific Research, National Defense Science and Engineering Graduate (NDSEG) Fellowship, 32 CFR 168a. M.C.H. also acknowledges the NSF MRSEC (DMR-1121262) and ONR (N00014-14-1-0669). The sensor fabrication and some material characterization were performed in the NUANCE Center, which has received support from the NSF MRSEC (DMR-1121262), the State of Illinois and Northwestern University. The material characterizations were performed at the Bioscience Electron Microscope Facility, the Physics HRTEM Laboratory and the Advanced Analysis Facility at the University of Wisconsin–Milwaukee. The theoretical calculations were carried out at the high-performance computation centre at the University of Wisconsin–Milwaukee. Sensor electrodes were fabricated at the Center for Nanoscale Materials of Argonne National Laboratory. Use of the Center for Nanoscale Materials, an Office of Science user facility, was supported by the U. S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357. Publisher Copyright: {\textcopyright} acmillan Publishers Limited. All rights reserved.",
year = "2015",
month = oct,
day = "21",
doi = "10.1038/ncomms9632",
language = "English",
volume = "6",
journal = "Nature Communications",
issn = "2041-1723",
publisher = "Nature Publishing Group",
}