Abstract
Sustainable manufacturing that prioritizes energy efficiency, minimal water use, scalability and the ability to generate diverse materials is essential to advance inorganic materials production while maintaining environmental consciousness. However, current manufacturing practices are not yet equipped to fully meet these requirements. Here we describe a flash-within-flash Joule heating (FWF) technique—a non-equilibrium, ultrafast heat conduction method—to prepare ten transition metal dichalcogenides, three group XIV dichalcogenides and nine non-transition metal dichalcogenide materials, each in under 5 s while in ambient conditions. FWF achieves enormous advantages in facile gram scalability and in sustainable manufacturing criteria when compared with other synthesis methods. Also, FWF allows the production of phase-selective and single-crystalline bulk powders, a phenomenon rarely observed by any other synthesis method. Furthermore, FWF MoSe2 outperformed commercially available MoSe2 in tribology, showcasing the quality of FWF materials. The capability for atom substitution and doping further highlights the versatility of FWF as a general bulk inorganic materials synthesis protocol.

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Data availability
The authors declare that the data supporting the findings of this study are available within the paper and its Supplementary Information files. Should any raw data files be needed in another format, they are available from the corresponding author upon reasonable request. All data used in this manuscript are also available in Zenodo at https://doi.org/10.5281/zenodo.12536975 (ref. 48). Source data are provided with this paper.
Code availability
The code used for DFT calculations can be found in Zenodo at https://doi.org/10.5281/zenodo.12536975 (ref. 48).
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Acknowledgements
J.M.T. thanks the Air Force Office of Scientific Research (FA9550-22-1-0526) and the US Army Corp of Engineers, ERDC (W912HZ-21-2-0050) for financial support. Y.H. acknowledges support from the Welch Foundation (C-2065-20210327). Supercomputing time is provided by the National Energy Research Scientific Computing Center (NERSC); the authors extend their sincere gratitude to B. Yakobson for providing the computational resources necessary for this research. The authors also thank the Rice Microscopy Center, Shared Equipment Authority (SEA) at Rice University and all staff members for their contribution in sample preparation, nanofabrication and microscopy measurement.
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Authors and Affiliations
Contributions
C.H.C. conceived the idea with L.E., achieved the first demonstration of FWF, conducted the synthesis of 22 materials, gram scalability, Raman, XRD, STEM, selected area electron diffraction and EDX characterization, and manuscript writing under the guidance of J.M.T. and Y.H.; J.S. performed the device fabrications and electrical measurements for MoSe2, WSe2 and α-In2Se3 materials and aided the synthesis of α-In2Se3; L.E. managed the FJH system and aided C.H.C. with the synthesis; V.G. performed the tribological experiments to analyse the COF. K.M.W. performed LCA analysis; B.D. acquired and analysed the XPS data; H.G. performed FIB for cross-section STEM sample preparation. G.G. aided C.H.C. in initial STEM characterization. Y.Z. contributed to the discussion of ultrafast thermal conduction pathway, calculation of internal tube temperature, and oxygen outgassing modelling. C.F.H.III supervised V.G. in performing and analysing tribological data. Y.H. supervised C.H.C. in microscopy analysis and guided C.H.C. in manuscript writing and figures. J.M.T. supervised C.H.C. in material synthesis, guided C.H.C. in manuscript writing and oversaw the entire project.
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Competing interests
A provisional patent application directed to this technology (63/520,553) has been filed by Rice University, but it is currently unlicensed. The inventors listed are Chi Hun ‘William’ Choi, Lucas Eddy and James M. Tour. The other authors declare no competing interests.
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Nature Chemistry thanks Il-Doo Kim and the other, anonymous, reviewer(s) for their contribution to the peer review of this work.
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Extended data
Extended Data Fig. 1 Internal tube temperature measurement.
a. A schematic description of the temperature measurement for a normal FWF reaction. b. A schematic description of the temperature measurement of skewed internal tube to decipher internal temperature during the reaction. For both temperature measurements, the laser-assisted thermometer is located 10 cm above the sample. The current flow could be different between the two configurations as the resistance might differ by packing of the metallurgical coke for the right configuration when compared to the left configuration. Yet, the total energy input remains constant. c. The infrared thermometer with an alignment laser was focused onto the sample area to read the time-dependent temperature change during the FWF reaction. d. The reaction dynamics during the FWF reaction.
Extended Data Fig. 2 XRD and Raman spectra for doping capability in Sn-based TMDs.
a. XRD spectrum of SnS2, Se-doped SnS2 (denoted as SnSxSey), and SnSe2. b. Raman spectrum of SnS2, Se-doped SnS2 (denoted as SnSxSey), and SnSe2 with pictures of corresponding powders as subsets. For SnSe2, a small amount of SnO2 (denoted in purple) is formed on the surface (confirmed by EDX mapping, see Fig. 3g).
Extended Data Fig. 3 Selected area electron diffraction (SAED) patterns of SnS2, α-In2Se3, MoSe2, and WSe2 flakes.
a. SAED of SnS2. b. SAED of α-In2Se3. c. SAED of MoSe2. d. SAED of WSe2. All the materials showed a single-crystalline nature in each flake.
Extended Data Fig. 4 S/TEM images and SAED patterns for commercial MoSe2 (a–c) and FWF MoSe2 (d–f).
a. TEM image of commercial MoSe2 with ~20 nm of amorphous layer at the edge of the flake. b. TEM image of another area of commercial MoSe2 with ~10 nm amorphous layer at the edge of the flake. c. SAED pattern of commercial MoSe2 indicating polycrystallinity and amorphous constituents. d. TEM image of FWF MoSe2 with little to no amorphous layer at the edge of the flake. e. ADF-STEM atomic resolution image of MoSe2 indicating sharp, well-defined crystalline structure at the edge of the flake. f. SAED pattern of FWF MoSe2 showing single crystallinity with no amorphous constituents.
Supplementary information
Supplementary Information
Supplementary methods (sample preparation), discussion (further discussion of the LCA), Figs. 1–40, Tables 1–9 and references.
Supplementary Video 1
Visualization of the tribological experiment procedure to obtain the COF.
Source data
Source Data Fig. 2
Source data for Fig. 2e–h.
Source Data Fig. 5
Source data for Fig. 5a.
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Choi, C.H.‘., Shin, J., Eddy, L. et al. Flash-within-flash synthesis of gram-scale solid-state materials. Nat. Chem. 16, 1831–1837 (2024). https://doi.org/10.1038/s41557-024-01598-7
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DOI: https://doi.org/10.1038/s41557-024-01598-7
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