TY  - JOUR
U1  - Wissenschaftlicher Artikel
A1  - Harouna-Mayer, Sani Y.
A1  - Klemeyer, Lars
A1  - Zito, Cecilia A.
A1  - Bielecki, Johan
A1  - Cheng, Xuemei
A1  - Derelli, Davide
A1  - Estillore, Armando D.
A1  - Gröne, Tjark L. R.
A1  - Haas, Lukas V.
A1  - Letrun, Romain
A1  - Kim, Chan
A1  - Koliyadu, Jayanath C. P.
A1  - Mall, Abhishek
A1  - Mazumder, Parichita
A1  - Melo, Diogo V. M.
A1  - Round, Adam R.
A1  - Samanta, Amit K.
A1  - Sarma, Abhisakh
A1  - Shen, Zhou
A1  - Sun, Xiao
A1  - Vagovic, Patrik
A1  - Wollweber, Tamme
A1  - Bean, Richard
A1  - Küpper, Jochen
A1  - Chapman, Henry N.
A1  - Koziej, Dorota
A1  - Ayyer, Kartik
T1  - Single-Particle X‑ray Scattering Reveals a High Local Supersaturation of Precursors as the Origin of CoO Assembly Formation
JF  - The Journal of Physical Chemistry Letters
N2  - Single-particle small-angle X-ray scattering (SP-SAXS) at X-ray free electron lasers (XFELs) enables quantitative analysis of morphological heterogeneity that is fundamentally inaccessible to ensemble-averaged in situ techniques. By recording diffraction snapshots from isolated particles, SP-SAXS resolves low-contrast, less abundant, or transient species within heterogeneous particle populations that would otherwise remain hidden to conventional X-ray techniques. We demonstrate this unique capability by investigating the solvothermal formation of CoO nanocrystal assemblies from a Co­(acac)3 precursor in benzyl alcohol. The single-particle data revealed amorphous, uniform-density Co­(acac)2 spheres as transient intermediates that directly crystallize into cavernous CoO nanocrystal assemblies, explaining why CoO forms as hierarchical aggregates rather than as isolated nanocrystals. These results establish SP-SAXS as a uniquely powerful framework for uncovering nonclassical nanoparticle formation pathways hidden in ensemble measurements.
AB  - Single-particle small-angle X-ray scattering (SP-SAXS) at X-ray free electron lasers (XFELs) enables quantitative analysis of morphological heterogeneity that is fundamentally inaccessible to ensemble-averaged in situ techniques. By recording diffraction snapshots from isolated particles, SP-SAXS resolves low-contrast, less abundant, or transient species within heterogeneous particle populations that would otherwise remain hidden to conventional X-ray techniques. We demonstrate this unique capability by investigating the solvothermal formation of CoO nanocrystal assemblies from a Co­(acac)3 precursor in benzyl alcohol. The single-particle data revealed amorphous, uniform-density Co­(acac)2 spheres as transient intermediates that directly crystallize into cavernous CoO nanocrystal assemblies, explaining why CoO forms as hierarchical aggregates rather than as isolated nanocrystals. These results establish SP-SAXS as a uniquely powerful framework for uncovering nonclassical nanoparticle formation pathways hidden in ensemble measurements.
Y1  - 2026
SN  - 1948-7185
SS  - 1948-7185
UN  - https://nbn-resolving.org/urn:nbn:de:hbz:kob7-26672
U6  - https://doi.org/10.1021/acs.jpclett.6c00191
DO  - https://doi.org/10.1021/acs.jpclett.6c00191
VL  - 17
IS  - 23
SP  - 6418
EP  - 6424
S1  - 7
PB  - American Chemical Society
ER  -