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Scalable synthesis of semiconducting MoB2 nanosheets for flexible and multifunctional UV–Vis photodetection
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DOI：10.1016/j.mattod.2025.11.008.png)
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Abstract
En 中文
Two-dimensional (2D) materials hold great promise for next-generation optoelectronic devices, yet the scalable production of semiconducting 2D transition metal borides (MBenes) remains a major challenge. In this work, we developed a rapid solid-state exfoliation strategy to directly obtain wide bandgap semiconducting molybdenum boride (SMB) nanosheets from commercial MoB2 powder. The exfoliation process by lithium borohydride (LiBH4)-assisted lithiation and hydrolysis enables efficient exfoliation of bulk MoB2 into few-layer SMB nanosheets of lateral dimensions within minutes, overcoming the intrinsic metallic limitations of conventional MBenes. The synthesized SMB nanosheets were deposited via spray coating onto a flexible polyethylene terephthalate (PET) substrate, followed by mask-assisted sputtering of Au contacts, and a low-power flexible broadband UV–visible (UV–vis) photodetector was fabricated. It exhibits excellent optoelectronic performance with a long-term stability, such as a high on-off ratio of 3.8 × 103@0.1 V, an excellent responsivity (47 A W−1), a high specific detectivity (7.9 × 1011 Jones), and a rapid response/recovery (25 ms/48 ms). Beyond conventional photodetection, the flexible device enables real-time pulse monitoring, photoplethysmography (PPG), and imaging capabilities, underscoring its multifunctionality. This study presents a novel pathway for developing scalable, high-performance, and wearable optoelectronics devices based on 2D metal boride.
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