Self-assembly of CdTe tetrapods into network monolayers at the air/water interface

Matthew D. Goodman, Lei Zhao, Karen A. Derocher, Jun Wang, Surya K. Mallapragada, Zhiqun Lin

Research output: Contribution to journalArticlepeer-review


Cadmium telluride (CdTe) tetrapods are synthesized with varying aspect ratios through multiple injections of the Te precursor, which provides an excellent means of controlling and tailoring the optical properties of the tetrapods. The self-assembly of CdTe tetrapods at the air/water interface is explored using the Langmuir-Blodgett (LB) technique due to potential use in solar cells arising from the intriguing tetrapod shape that improves charge transport and the optimum band gap energy of CdTe that enhances light absorption. Interestingly, the Langmuir isotherm shows two pressure plateau regions: one at ∼10 mN/m with the other at the high surface pressure of ∼39 mN/m. LB deposition at various pressures allows the discernment of the unique two-dimensional packing alluded in the isotherm. By placing CdTe at the air/water interface, it is revealed in the deposition that the tetrapods experienced a dewetting phenomenon, forming a ribbon structure at the onset of surface pressure with a height corresponding to the length of one tetrapod arm. With the increase of surface pressure, the ribbons widen to an eventual large-scale percolated network pattern. The packing density of tetrapods is successfully manipulated by controlling the surface pressure, which may find promising applications in optoelectronic devices.

Original languageEnglish (US)
Pages (from-to)2043-2050
Number of pages8
JournalACS Nano
Issue number4
StatePublished - Apr 27 2010
Externally publishedYes


  • CdTe
  • Langmuir-Blodgett
  • Network
  • Self-assembly
  • Tetrapod

ASJC Scopus subject areas

  • General Materials Science
  • General Engineering
  • General Physics and Astronomy


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