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Femtomolar-Level Molecular Sensing of Monolayer Tungsten Diselenide Induced by Heteroatom Doping with Long-Term Stability
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2022-06-17 , DOI: 10.1002/adfm.202200273 Qian Lv 1 , Junyang Tan 2 , Zhijie Wang 2 , Lingxiao Yu 1 , Bilu Liu 2 , Junhao Lin 3 , Jia Li 2, 4 , Zheng‐Hong Huang 1, 5 , Feiyu Kang 1, 2, 4, 5 , Ruitao Lv 1, 5
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2022-06-17 , DOI: 10.1002/adfm.202200273 Qian Lv 1 , Junyang Tan 2 , Zhijie Wang 2 , Lingxiao Yu 1 , Bilu Liu 2 , Junhao Lin 3 , Jia Li 2, 4 , Zheng‐Hong Huang 1, 5 , Feiyu Kang 1, 2, 4, 5 , Ruitao Lv 1, 5
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Surface-enhanced Raman scattering (SERS) is a sensitive, fast, and nondestructive technology to detect trace amounts of molecules. The development of ultrasensitive and environmentally stable noble-metal-free SERS substrates is crucial for practical applications but still very challenging. In this contribution, an in situ substitutional doping strategy to synthesize Re-doped WSe2 (Re-WSe2) with different doping levels is reported. By increasing the Re content to ≈50 at%, the Re-WSe2 alloy inherits the 1T″ phase of the ReSe2 lattice. Furthermore, Nb atoms are doped into the 1T″ Re-WSe2 alloy to further modulate its electronic structure. The as synthesized 1T″ Nb, Re-WSe2 demonstrates a femtomolar-level molecular sensing capability with a detectable concentration of 5 × 10–15 m and the corresponding enhancement factor is 2.0 × 109, which is superior to that of most non-noble-metal SERS substrates and comparable or even superior to that of noble-metal substrates to the best of the authors’ knowledge. More importantly, the as-synthesized 1T″ Nb, Re-WSe2 exhibits excellent air-stability over a long term (≈6 months) and selective detection capability in the mixed molecular solution, which are essential for their practical applications. The work provides a new strategy for the rational design of noble-metal-free SERS substrates to achieve ultrasensitive molecular sensing.
中文翻译：
具有长期稳定性的杂原子掺杂诱导的单层二硒化钨的飞摩尔级分子传感
表面增强拉曼散射 (SERS) 是一种灵敏、快速且无损检测微量分子的技术。开发超灵敏且环境稳定的无贵金属 SERS 基板对于实际应用至关重要，但仍然非常具有挑战性。在该贡献中，报道了一种合成具有不同掺杂水平的重掺杂WSe 2 (Re-WSe 2 )的原位替代掺杂策略。通过将 Re 含量增加到 ≈50 at%，Re-WSe 2合金继承了 ReSe 2晶格的 1T" 相。此外，Nb 原子被掺杂到 1T" Re-WSe 2合金中以进一步调节其电子结构。合成的 1T″ Nb, Re-WSe 2展示了飞摩尔级的分子传感能力，可检测浓度为 5 × 10 –15 m，相应的增强因子为 2.0 × 10 9，优于大多数非贵金属 SERS 基板，可与甚至优于据作者所知，贵金属基板的情况。更重要的是，合成后的 1T" Nb, Re-WSe 2在长期（≈6 个月）内表现出优异的空气稳定性和在混合分子溶液中的选择性检测能力，这对其实际应用至关重要。该工作为合理设计无贵金属SERS衬底以实现超灵敏分子传感提供了新的策略。
更新日期：2022-06-17
中文翻译：
具有长期稳定性的杂原子掺杂诱导的单层二硒化钨的飞摩尔级分子传感
表面增强拉曼散射 (SERS) 是一种灵敏、快速且无损检测微量分子的技术。开发超灵敏且环境稳定的无贵金属 SERS 基板对于实际应用至关重要，但仍然非常具有挑战性。在该贡献中，报道了一种合成具有不同掺杂水平的重掺杂WSe 2 (Re-WSe 2 )的原位替代掺杂策略。通过将 Re 含量增加到 ≈50 at%，Re-WSe 2合金继承了 ReSe 2晶格的 1T" 相。此外，Nb 原子被掺杂到 1T" Re-WSe 2合金中以进一步调节其电子结构。合成的 1T″ Nb, Re-WSe 2展示了飞摩尔级的分子传感能力，可检测浓度为 5 × 10 –15 m，相应的增强因子为 2.0 × 10 9，优于大多数非贵金属 SERS 基板，可与甚至优于据作者所知，贵金属基板的情况。更重要的是，合成后的 1T" Nb, Re-WSe 2在长期（≈6 个月）内表现出优异的空气稳定性和在混合分子溶液中的选择性检测能力，这对其实际应用至关重要。该工作为合理设计无贵金属SERS衬底以实现超灵敏分子传感提供了新的策略。
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