Quantum Size Effects on the Chemical Sensing Performance of Two-Dimensional Semiconductors

Details Quantum Size Effects on the Chemical Sensing Performance of Two-Dimensional Semiconductors Quantum Size Effects on the Chemical Sensing Performance of Two-Dimensional Semiconductors

2012-04-19

arxiv.org/abs/1204.4461v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

10.1021/jp300446z

We investigate the role of quantum confinement on the performance of gas sensors based on two-dimensional InAs membranes. Pd-decorated InAs membranes configured as H2 sensors are shown to exhibit strong thickness dependence, with ~100x enhancement in the sensor response as the thickness is reduced from 48 to 8 nm. Through detailed experiments and modeling, the thickness scaling trend is attributed to the quantization of electrons which favorably alters both the position and the transport properties of charge carriers; thus making them more susceptible to surface phenomena.

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