To guarantee the normal operation of next generation portable electronics and wearable devices, together with avoiding electromagnetic wave pollution, it is urgent to find a material possessing flexibility, ultrahigh conductive, and superb electromagnetic interference shielding effectiveness (EMI SE) simultaneously. In this work, inspired by a building bricks toy with the interlock system, we design and fabricate a copper/large flake size graphene (Cu/LG) composite thin film (≈8.8 μm) in the light of high temperature annealing of a large flake size graphene oxide film followed by magnetron sputtering of copper. The obtained Cu/LG thin-film shows ultrahigh thermal conductivity of over 1932.73 (±63.07) W m K and excellent electrical conductivity of 5.88 (±0.29) × 10 S m . Significantly, it also exhibits a remarkably high EMI SE of over 52 dB at the frequency of 1-18 GHz. The largest EMI SE value of 63.29 dB, accorded at 1 GHz, is enough to obstruct and absorb 99.99995% of incident radiation. To the best of knowledge, this is the highest EMI SE performance reported so far in such thin thickness of graphene-based materials. These outstanding properties make Cu/LG film a promising alternative building block for power electronics, microprocessors, and flexible electronics.

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We synthesized a novel 2D hybrid material composed of Li2FeSiO4 nanorods (LFSNRs) anchored on graphene.

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Although several patterning methods, such as lithography, spray-masking and laser cutting, have been used for facile fabrication of those devices, the complicated processing and excessive material consumption in these protocols limit the scalable production of flexible devices. [4] So far, it remains a significant challenge to achieve multifunctional devices such as EMI shielding, [5] Joule heater, [6] sensor, [7][8][9] radio frequency identification (RFID) tags, [10] and energy storage unit [11] by using simple and low-cost methods. In addition, seeking a suitable material is vital to develop and design high-performance multifunctional devices in low cost.Recent progress in liquid-phase exfoliation of two-dimensional (2D) nanomaterials has highlighted the rational design of functional inks for additive manufacturing of high-performance devices with complex architectures based on printing strategies, such as screen printing, gravure printing and inkjet printing. [12] Screen printing among them is of critical importance to manufacture integrated multifunctional devices by formulating functional inks, without using expensive and complicate equipment. [13] Specially, screen printing provides the highest deposition rate (per unit time deposition material weight) than other printing technologies. [14] One of the main challenges lies in formulation of functional inks with appropriate rheological properties, which are prerequisite for screenprinting multifunctional devices with high resolution. [15,16] As a new family of 2D layered transition metal carbides or nitrides, MXenes have become promising candidate for formulation of printable inks because of their remarkable electronic, optical, and mechanical properties. [17] Generally, MXenes are usually synthesized by selectively etching A layer in the precursor of MAX phase. They can be represented by M n+1 X n T x , where M is the early transition metal, X stands for carbon and/ or nitrogen, and T x represents the terminal hydroxyl, oxygen, or fluorine groups. [18,19] As a result, MXenes offer solution processing capabilities owing to their superior hydrophilicity and high negative surface charge. [20] Clay-like behavior of MXene slurry and the formation of stable colloidal suspension have thus facilitated the fabrication of conducting films, nanocomposites, coatings and fibers for applications in energy MXenes have exhibited potential for application in flexible devices owing to their remarkable electronic, optical, and mechanical properties. Printing strategies have emerged as a facile route for additive manufacturing of MXene-based devices, which relies on the rational design of functional inks with appropriate rheological properties. Herein, aqueous MXene/xanthan gum hybrid inks with tunable viscosity, excellent printability, and long-term stability are designed. Screen-printed flexible MXene films using such hybrid inks exhibit a high conductivity up to 4.8 × 10 4 S m −1 , which is suitable to construct multifunctional devices mainly including electromagnetic shield...