Quantum size effects on the chemical sensing performance of two-dimensional semiconductors

Junghyo Nah, S. Bala Kumar, Hui Fang, Yu Ze Chen, Elena Plis, Yu Lun Chueh, Sanjay Krishna, Jing Guo, Ali Javey

Research output: Contribution to journalArticlepeer-review

37 Citations (Scopus)


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 H 2 sensors are shown to exhibit strong thickness dependence, with ∼100× 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.

Original languageEnglish
Pages (from-to)9750-9754
Number of pages5
JournalJournal of Physical Chemistry C
Issue number17
Publication statusPublished - 2012 May 3

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films


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