―127―Hiroya Abe (Creative Interdisciplinary Research Division/ Device and Technology) On-demand underwater adhesives with remarkable adhesive and gentle detachment properties allow for a stable connection to various biomedical devices and bio-interfaces and avoid posing a significant risk of inflicting deleterious tissue damage upon detachment. Herein, we developed a hydrogel adhesive that can reversibly switch adhesion strength by temperature using thermo-responsive polymer and mussel-inspired molecules. The thermo-switchable adhesive (TSA) hydrogel displayed both strong adhesion and gentle detachment with over a 1,000-fold gap in underwater adhesion strength onto a glass, Ti, Al, and Teflon substrate when exposed to temperatures above and below the lower critical solution temperature (LCST). The possible factor of significant adhesion switch is the obvious changes in the mechanical strength of TSA hydrogels with temperatures since the hydrogel possesses gradient crosslinked structures and the lowermost surface is sufficiently soft to detach from the substrate below the LCST gently. The electrode-integrated hydrogel was maintained on the human skin and electrical signals were monitored continuously over 10 minutes above the LCST. In contrast, commercially available hydrogel electrodes quickly swelled and detached from the skin. The thermo-switchability of the TSA hydrogel with robust adhesion and gentle detachment offers significant potential for biomedical applications characterized by minimally invasive procedures. Chao Tang (Creative Interdisciplinary Research Division/Device and Technology Area) Two-dimensional (2D) materials, such as graphene, MoS2, and black phosphorus, stand at the forefront of advancements in spintronics, electrical engineering, and wireless communications. Their transformative potential is augmented through the deliberate integration of diverse 2D materials in heterostructures, propelling their functional capabilities beyond those of individual components. The exploration of terahertz (THz) waves for high-speed communications opens a promising avenue, albeit constrained by current limitations in detectors. This research unveils an intriguing exposition, spotlighting two distinctive 2D material heterostructures, graphene/h-BN/graphene and graphene/black phosphorus. In the latter structure, black phosphorus assumes the critical role of a quantum barrier. Here, the hot carriers, excited by THz radiation, navigate this barrier, facilitating their transport to electrodes and resulting in high responsivity detection. The primary focus involves a meticulous exploration of the heterostructures' voltage-current characteristics and impedance within the THz spectrum. This detailed analysis seeks to illuminate their potential as state-of-the-art, high-sensitivity THz detectors [1-4]. By delving into these innovative heterostructures, this report aims to pave the way for overcoming existing challenges and limitations, thereby catalyzing progress in THz communication systems. References [1] V. Ryzhii, C. Tang, T. Otsuji, et al., Scientific Reports 13, 10 (2023). [2] V. Ryzhii, C. Tang, T. Otsuji, et al., Physical Review Applied 19, 064033 (2023). [3] V. Ryzhii, C. Tang, T. Otsuji, et al., Journal of Applied Physics 133, 174501 (2023). [4] V. Ryzhii, C. Tang, T. Otsuji, et al., AIP Advances 13, 7 (2023). □□Mussel-inspired underwater adhesive hydrogel High-sensitive THz detector development based on the Semimetal/Semiconductor 2D material heterostructure
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