A bottom-up approach toward fabrication of ultrathin PbS sheets

Somobrata Acharya, Bidisa Das, Umamahesh Thupakula, Katsuhiko Ariga, D. D. Sarma, Jacob Israelachvili, Yuval Golan

Research output: Contribution to journalArticlepeer-review

97 Scopus citations


Two-dimensional (2D) sheets are currently in the spotlight of nanotechnology owing to high-performance device fabrication possibilities. Building a free-standing quantum sheet with controlled morphology is challenging when large planar geometry and ultranarrow thickness are simultaneously concerned. Coalescence of nanowires into large single-crystalline sheet is a promising approach leading to large, molecularly thick 2D sheets with controlled planar morphology. Here we report on a bottom-up approach to fabricate high-quality ultrathin 2D single crystalline sheets with well-defined rectangular morphology via collective coalescence of PbS nanowires. The ultrathin sheets are strictly rectangular with 1.8 nm thickness, 200-250 nm width, and 3-20 μm length. The sheets show high electrical conductivity at room and cryogenic temperatures upon device fabrication. Density functional theory (DFT) calculations reveal that a single row of delocalized orbitals of a nanowire is gradually converted into several parallel conduction channels upon sheet formation, which enable superior in-plane carrier conduction.

Original languageEnglish
Pages (from-to)409-415
Number of pages7
JournalNano Letters
Issue number2
StatePublished - 13 Feb 2013


  • DFT calculations
  • Nanowires
  • activation energy
  • coalescence
  • transport
  • ultrathin sheet

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry (all)
  • Materials Science (all)
  • Condensed Matter Physics
  • Mechanical Engineering


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