磷烯
灵敏度(控制系统)
材料科学
吸附
带隙
晶体管
光电子学
图层(电子)
场效应晶体管
纳米技术
化学
电子工程
物理
物理化学
电压
工程类
量子力学
作者
Shumao Cui,Haihui Pu,Spencer A. Wells,Zhenhai Wen,Shun Mao,Jingbo Chang,Mark C. Hersam,Junhong Chen
摘要
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. NO2 at 300 K. Our sensitivity modelling further suggests that the dependence of sensitivity on the PNS thickness is dictated by the band gap for thinner sheets (<10 nm) and by the effective thickness on gas adsorption for thicker sheets (>10 nm).
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