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Related Concept Videos

Production and Targeting of Monovalent Quantum Dots10:16

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We provide detailed instructions for the preparation of monovalent targeted quantum dots (mQDs) from phosphorothioate DNA of defined length. DNA wrapping occurs in high yield, and therefore, products do not require purification. We demonstrate the use of the SNAP tag to target mQDs to cell-surface receptors for live-cell imaging applications.
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Related Experiment Video

Updated: Jan 19, 2026

Production and Targeting of Monovalent Quantum Dots
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Published on: October 23, 2014

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Orientational Disorder in Epitaxially Connected Quantum Dot Solids.

Arthur R C McCray1, Benjamin H Savitzky2, Kevin Whitham3

  • 1School of Applied and Engineering Physics , Cornell University , Ithaca , New York 14853 , United States.

ACS Nano
|September 11, 2019
PubMed
Summary
This summary is machine-generated.

Structural disorder limits quantum dot (QD) electronic properties. We quantified QD film misalignment using electron microscopy, revealing significant strain and variable superlattice orientation, challenging simple growth models.

Keywords:
PbSenanocrystalsorientational disorderquantum dot solidsscanning transmission electron microscopyself-assembly

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Periodic arrays of colloidal quantum dots (QDs) offer tunable electronic band structures for advanced applications.
  • Theoretical predictions of engineered bandgaps and novel electronic states are limited by experimental structural disorder.

Purpose of the Study:

  • To precisely quantify orientational disorder in epitaxially connected QD films.
  • To correlate local atomic lattice (AL) and superlattice (SL) orientations.
  • To understand the impact of disorder on QD film growth and electronic properties.

Main Methods:

  • Aberration-corrected scanning transmission electron microscopy (STEM) for high-resolution imaging.
  • Quantification of orientational misalignment (standard deviation of 1.9°) and bending strain.
  • Analysis of local superlattice (SL) orientation using the bond orientational order metric ψ₄.

Main Results:

  • Significant persistent misalignment and localized bending strain observed between nearest-neighbor QDs.
  • Out-of-plane QD misorientations correlate with in-plane misalignments.
  • Larger variations in SL orientation compared to AL orientation, with a variable correlation between the two.

Conclusions:

  • Structural disorder, particularly orientational misalignment, is a critical factor limiting QD electronic properties.
  • Distinct AL and SL behaviors near grain boundaries suggest complex growth mechanics.
  • Simplified epitaxial growth models may be insufficient for predicting QD film properties when oriented attachment and superlattice formation occur simultaneously.