Transition in morphology and properties in bottom-up HPHT nanodiamonds synthesized from chloroadamantane

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388980%3A_____%2F25%3A00619460" target="_blank" >RIV/61388980:_____/25:00619460 - isvavai.cz</a>
Alternative codes found
RIV/68378271:_____/25:00619460 RIV/68407700:21230/25:00385018 RIV/44555601:13520/25:43899214 RIV/49777513:23640/25:43976543
Result on the web
<a href="https://hdl.handle.net/11104/0366421" target="_blank" >https://hdl.handle.net/11104/0366421</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1039/d4na00802b" target="_blank" >10.1039/d4na00802b</a>

Result language
angličtina
Original language name
Transition in morphology and properties in bottom-up HPHT nanodiamonds synthesized from chloroadamantane
Original language description
Direct bottom-up high pressure high temperature (BU_HPHT) synthesis of nanodiamonds (NDs) from organic precursors excels in the ability to control the size of the resulting BU_HPHT NDs via the temperature of the synthesis. Here we investigated size-dependent thermal, colloidal, and structural properties of the BU_HPHT NDs and focused on the transition in morphology and properties occurring at around 900 °C (z2 nm). Using transmission electron microscopy, small angle X-ray scattering and atomic force microscopy we show that the sub-900 °C samples (<2 nm NDs) do not have nanoparticle character but 2D platelet morphology with sub-nm unit thickness. Correspondingly, sub-900 °C samples (<2 nm NDs) have a negative zeta potential and hydrophobic character and should be considered as a form of a molecular diamond. The above-900C (>2 nm NDs) samples have nanocrystalline character, positive zeta potential and are dispersible in water similarly to other types of hydrogenated NDs. By in situ Raman spectroscopy experiments, we show that the transition is also related to the structural instability of the oxidized sub-2 nm BU_HPHT NDs.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10402 - Inorganic and nuclear chemistry

Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2025
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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