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The heterogeneous integration of an LNOI waveguide device on a mature Si platform is interesting for the creation of a future high density and multi-functional platform. This paper reports the fabrication of a bent LNOI waveguide on Si substrate using surface activated bonding with a Si nanoadhesive layer and post-bond ultra-precision cutting at room temperature. This bonding method demonstrates the sufficient bond strength between an LN wafer and thermally grown SiO 2 to withstand ductile-mode cutting for waveguide fabrication. In this work, the width, height, and bent radius of the ridged LNOI waveguide on Si substrate were approximately 5, 2.5, and 300 μm, respectively. These room-temperature bonding and cutting methods are expected to fabricate various heterogenous devices with a large coefficient of thermal expansion mismatch between dissimilar materials, not just LNOI/Si waveguide devices.

This study reports on a composite consisting of iron (Fe) particles embedded in graphitic carbon network, which was prepared using a facile chemical synthesis method. The Fe-embedded carbon composite was used as the anode material for Fe-air batteries whose electrochemical charge-discharge performance was subsequently evaluated. The effect of adding 0.01M Na 2 S to the batteries' alkaline electrolyte on the electrochemical performances of the Fe-embedded carbon composite was investigated. The addition of Na 2 S to the electrolyte resulted in a higher discharge capacity during the charge-discharge characterization. A maximum discharge capacity of 486 mAh g −1 (Fe) was obtained because sulfide ions present in the electrolyte inhibited Fe passivation, thus enabling a better redox reaction. Interestingly, after prolonged chargedischarge cycling (100 cycles), the replenishment of the 0.01M Na 2 S in the electrolyte resulted in the recovery of a high initial discharge capacity. The facile synthesis process, effect of Na 2 S addition, and the feasibility of discharge capacity recovery after prolonged charge-discharge cycling reported in this study should be beneficial toward the further development of rechargeable Feair batteries.