Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
Permanent URI for this collectionhttps://hdl.handle.net/11147/7148
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Article Electrically Controlled Heat Transport in Graphite Films Via Reversible Ionic Liquid Intercalation(Amer Assoc Advancement Science, 2025) Steiner, Pietro; Adnan, Saqeeb; Ergoktas, M. Said; Barrier, Julien; Yu, Xiaoxiao; Orts, Vicente; Kocabas, CoskunThe ability to control heat transport with electrical signals has been an outstanding challenge due to the lack of efficient electrothermal materials. Previous attempts have mainly concentrated on low-thermal conductivity materials and encountered various problems such as narrow dynamic range and modest on/off ratios. Here, using high-thermal conductivity graphite films, we demonstrate an electrothermal switch enabling electrically tunable heat flow at the device level. The device uses reversible electro-intercalation of ions to modulate the in-plane thermal conductivity of graphite film by more than 13-fold via tunable phonon scattering, enabling observable modulation of the thermal conductivity at the device level. We anticipate that our results could provide a realistic pathway for adaptive thermal transport, enabling electrically driven thermal devices that would find a broad spectrum of applications in aerospace and microelectronics.Article Citation - WoS: 192Citation - Scopus: 194Multispectral Graphene-Based Electro-Optical Surfaces With Reversible Tunability From Visible To Microwave Wavelengths(Nature Research, 2021) Ergoktas, M. Said; Bakan, Gökhan; Kovalska, Evgeniya; Le Fevre, Lewis W.; Fields, Richard P.; Steiner, Pietro; Yu, Xiaoxiao; Balcı, SinanOptical materials with colour changing abilities have been explored for use in display devices(1), smart windows(2,3) or in the modulation of visual appearance(4-6). The efficiency of these materials, however, has strong wavelength dependence, which limits their functionality to a specific spectral range. Here, we report graphene-based electro-optical devices with unprecedented optical tunability covering the entire electromagnetic spectrum from the visible to microwave. We achieve this non-volatile and reversible tunability by electro-intercalation of lithium into graphene layers in an optically accessible device structure. The unique colour changing capability, together with area-selective intercalation, inspires the fabrication of new multispectral devices, including display devices and electro-optical camouflage coating. We anticipate that these results provide realistic approaches for programmable smart optical surfaces with a potential utility in many scientific and engineering fields such as active plasmonics and adaptive thermal management.