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Peptoid-directed assembly of CdSe nanoparticles.

Madison Monahan¹, Bin Cai², Tengyue Jian²

¹Department of Chemistry, University of Washington, Box 351700, Seattle, WA 98195-1700, USA. cossairt@uw.edu.

|January 6, 2021

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Polymorphism in Self-Assembly of Short Peptoid Sequences.

Polymer science & technology (Washington, D.C.)·2026

Peptoids, protein-like molecules, enable precise assembly of cadmium selenide quantum dots (QDs). Modifying peptoid chemistry allows controlled QD density on hybrid nanomaterials for new functions.

Area of Science:

Materials Science
Nanotechnology
Biomimetic Chemistry

Background:

Proteins organize inorganic nanomaterials due to their high information content.
Peptoids offer a tunable, protein-like scaffold for precise self-assembly.
Controlling inorganic material assembly with organic scaffolds is key for new functions.

Purpose of the Study:

To explore peptoid tubes and sheets as platforms for assembling colloidal quantum dots (QDs).
To investigate covalent linkage strategies for attaching cadmium selenide (CdSe) QDs to peptoids.
To understand how peptoid structure influences QD assembly and density.

Main Methods:

Synthesis of CdSe QDs with difunctionalized capping ligands (carboxylic acid and thiol).
Conjugation of QDs to maleimide-functionalized peptoids (tubes and sheets).

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Published on: February 6, 2020

Modification of peptoid functional groups (e.g., replacing carboxylic acid with methoxy ethers) to control QD density.

1H NMR spectroscopy to analyze QD-peptoid binding interactions.

Main Results:

Successful covalent linkage and assembly of CdSe QDs onto peptoid surfaces (tubes and sheets).
Non-specific interactions with carboxylic acid groups limited QD density control.
Replacing carboxylic acid with methoxy ethers enabled controlled QD density via maleimide concentration.
Demonstrated compatibility and control in creating complex CdSe-peptoid hybrid structures.

Conclusions:

Peptoids are effective scaffolds for assembling inorganic nanomaterials like CdSe QDs.
Covalent linkage strategies, particularly with modified peptoid structures, allow for controlled QD density.
This work paves the way for designing complex hybrid nanomaterials with tunable properties and functions.