article published yes Konstantin P. Shchukin author Oliver N. Gallego Lacey author Baptiste Coquinot author f8417bd4-f599-11ee-a482-b927e3ed1e8e0000-0001-5524-596X Jacek Jakowski author Jingsong Huang author Patrik Staudenmayer author Yannic Falke author Ram Prakash Pandeya author Alexander Grüneis author MiLe department An in-operando electro-intercalation method for the on-chip synthesis of alkali-metal-intercalated materials and their Raman spectroscopic and transport characterization in ultrahigh vacuum (UHV) is developed. We apply this method to synthesize fulleride superconductors via Rb+ intercalation into a C60 film. During the intercalation, we monitor the stoichiometry via UHV-Raman spectroscopy and probe superconductivity via transport measurements. An increase of the superconducting transition temperature from 7.0 K to 14.5 K is observed when the stoichiometry is tuned from Rb2.7C60 to Rb3C60. In our experiment, an ionic Rb+ flux into the host material is induced by an applied electronic current via a Butler–Volmer-type mechanism. Electro-intercalation captivates through improved stoichiometric precision, the ability to smoothly vary stoichiometry via duration of current application, and the absence of a lower limit of the volume of the host material. It represents a powerful concept for the on-chip synthesis of intercalated materials, battery research, and beyond. https://research-explorer.ista.ac.at/download/22145/22150/2026_ACSNano_Shchukin.pdf application/pdfno American Chemical Society2026 eng fullerideintercalationalkali metalsuperconductivityRaman 1936-0851 1936-086X 4226072310.1021/acsnano.6c02466 202417360-17372 Shchukin, Konstantin P., Oliver N. Gallego Lacey, Baptiste Coquinot, Jacek Jakowski, Jingsong Huang, Patrik Staudenmayer, Yannic Falke, Ram Prakash Pandeya, and Alexander Grüneis. “On-Chip Tuning of Superconductivity in Fullerides via Current-Driven Rb+ Intercalation.” <i>ACS Nano</i>. American Chemical Society, 2026. <a href="https://doi.org/10.1021/acsnano.6c02466">https://doi.org/10.1021/acsnano.6c02466</a>. K. P. Shchukin <i>et al.</i>, “On-chip tuning of superconductivity in fullerides via current-driven Rb+ intercalation,” <i>ACS Nano</i>, vol. 20, no. 24. American Chemical Society, pp. 17360–17372, 2026. Shchukin, Konstantin P., et al. “On-Chip Tuning of Superconductivity in Fullerides via Current-Driven Rb+ Intercalation.” <i>ACS Nano</i>, vol. 20, no. 24, American Chemical Society, 2026, pp. 17360–72, doi:<a href="https://doi.org/10.1021/acsnano.6c02466">10.1021/acsnano.6c02466</a>. Shchukin KP, Gallego Lacey ON, Coquinot B, et al. On-chip tuning of superconductivity in fullerides via current-driven Rb+ intercalation. <i>ACS Nano</i>. 2026;20(24):17360-17372. doi:<a href="https://doi.org/10.1021/acsnano.6c02466">10.1021/acsnano.6c02466</a> K.P. Shchukin, O.N. Gallego Lacey, B. Coquinot, J. Jakowski, J. Huang, P. Staudenmayer, Y. Falke, R.P. Pandeya, A. Grüneis, ACS Nano 20 (2026) 17360–17372. Shchukin, K. P., Gallego Lacey, O. N., Coquinot, B., Jakowski, J., Huang, J., Staudenmayer, P., … Grüneis, A. (2026). On-chip tuning of superconductivity in fullerides via current-driven Rb+ intercalation. <i>ACS Nano</i>. American Chemical Society. <a href="https://doi.org/10.1021/acsnano.6c02466">https://doi.org/10.1021/acsnano.6c02466</a> Shchukin KP, Gallego Lacey ON, Coquinot B, Jakowski J, Huang J, Staudenmayer P, Falke Y, Pandeya RP, Grüneis A. 2026. On-chip tuning of superconductivity in fullerides via current-driven Rb+ intercalation. ACS Nano. 20(24), 17360–17372. 221452026-06-28T22:01:34Z2026-06-29T09:00:33Z