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Precursor-Directed Self-Assembly in Hydrothermal Carbon Nitride Nanostructures Revealed by Nano-FTIR
Glorianne P Dorcé1, Wassie M Takele1, Michael J Holzmann1
1Department of Chemistry and Chemical Biology, and £Center for High Technology Materials, University of New Mexico, Albuquerque, New Mexico 87131, United States.
The Journal of Physical Chemistry Letters
|July 3, 2026
Summary
Researchers developed a new method to study how small organic nanoparticles form and self-assemble in solution. This technique reveals how hydrogen bonding influences nanoparticle stability and structure, leading to better control over carbon-rich nanomaterials.
Area of Science:
- Materials Science
- Nanotechnology
- Chemical Synthesis
Background:
- Hydrothermal reactions offer a route to carbon-rich nanomaterials.
- Understanding nanoscale product formation and self-assembly in solution is crucial but poorly understood.
Purpose of the Study:
- To investigate the nature and evolution of nanoscale products in solution.
- To reveal the role of these nanoparticles in directing self-assembly.
- To understand the influence of precursor chemistry on nanoparticle formation and behavior.
Main Methods:
- Dilution-assisted isolate-and-probe strategy.
- Sequential dilution combined with atomic force microscopy (AFM).
- Nano-Fourier-transform infrared spectroscopy (Nano-FTIR).
Main Results:
- Citric acid-urea (CAU) products show concentration-dependent size reduction and form stable supramolecular nanoparticles upon aging.
- Evaporation-driven phase separation in CAU leads to surface enrichment of hydrogen-bonded molecules and formation of heterogeneous nanowire-like structures.
- Citric acid-thiourea (CAT) products yield smaller, uniform, less polar nanoparticles with limited self-assembly.
Conclusions:
- Small organic nanoparticles act as dynamic reactive centers influencing aging and self-assembly.
- Intermolecular hydrogen bonding is key in directing nanoparticle stability and surface organization.
- The study provides direct insights into nanoparticle evolution and self-assembly in solution.
