PubMed İndeksli Yayınlar Koleksiyonu / PubMed Indexed Publications Collection
Permanent URI for this collectionhttps://hdl.handle.net/11147/7645
Browse
2 results
Search Results
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, Coskun; 01. Izmir Institute of TechnologyThe 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; Balcı, Sinan; Kovalska, Evgeniya; Le Fevre, Lewis W.; Fields, Richard P.; Steiner, Pietro; Yu, Xiaoxiao; Balcı, Sinan; 04.04. Department of Photonics; 04. Faculty of Science; 01. Izmir Institute of TechnologyOptical 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.