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

By S. Cui, H. Pu, Spencer A. Wells, Z. Wen, Shun Mao, Jingbo Chang, Mark C. Hersam, Junhong Chen. Nature Communications, 2015

697 citations recorded by the source corpus.

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 ∼1015 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). Phosphorene is one of a growing number of 2D materials with high potential for device applications. Here, the authors report a sensor composed of phosphorene nanosheets, showing a high sensitivity to NO2in dry air and also demonstrate that the sensitivity depends on the nanosheet thickness.

Subfields: Electrical and Electronic Engineering, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/151b740185d956aa4c1099bcb03297ae106ffab6

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Citations in the corpus

Frontiers of graphene and 2D material-based gas sensors for environmental monitoring (2020, background): “[343] Cui S, Pu H, Wells S A, Wen Z, Mao S, Chang J,”
Recent advances in synthesis, properties, and applications of phosphorene (2017, background): “While most of the reports on the use of phosphorene for electrochemical energy storage applications are theoretical DFT-based calculations, 111, 112, 122 some first experimental studies have also been reported, 124 including the work of Cui et al.(97), on the mechanism of sodiation in BP and hybrid ”
The rising star of 2D black phosphorus beyond graphene: synthesis, properties and electronic applications (2017, background): “8 nm led to the maximum response of the devices (figure 7(e)) [137].”
Recent Developments in 2D Nanomaterials for Chemiresistive-Type Gas Sensors (2018, background): “investigated layer-dependent gas sensing performance of BP nanosheets toward NO2 at room temperature [196].”