MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, People's Republic of China.
Nano Lett. 2022 Aug 24;22(16):6590-6598. doi: 10.1021/acs.nanolett.2c01825. Epub 2022 Aug 15.
Herein, with two-dimensional (2D) borocarbonitride (BCN) as a metal- and plasmon-free surface-enhanced Raman scattering (SERS) platform, we demonstrate a band structure engineering strategy to facilitate the charge transfer process for an enhanced SERS response. Especially, when the conduction band of the BCN substrate is tuned to align with the LUMO of the target molecule, remarkable SERS performance is achieved, ascribed to the borrowing effect from the vibronic coupling of resonances through the Herzberg-Teller coupling term. Meanwhile, fluorescence quenching is achieved due to the efficient charge transfer between the BCN substrate and target molecule. Consequently, BCN can accurately detect 20 kinds of trace chemical and bioactive analytes. Moreover, BCN exhibits excellent thermal and chemical stability, which can not only withstand high-temperature (300 °C) heating in the air but also resist long-term corrosion in harsh acid (pH = 0, HCl) and base (pH = 14, NaOH). This work provides new insight into band structure engineering in promoting the SERS performance of plasmon- and metal-free semiconductor substrates.
在这里，我们以二维（2D）硼碳氮化物（BCN）作为无金属和等离子体的表面增强拉曼散射（SERS）平台，展示了一种能带结构工程策略，以促进电荷转移过程，从而增强 SERS 响应。特别是，当 BCN 衬底的导带被调谐到与目标分子的 LUMO 对齐时，就会实现显著的 SERS 性能，这归因于通过 Herzberg-Teller 耦合项的共振的振子耦合的借振作用。同时，由于 BCN 衬底和目标分子之间的有效电荷转移，实现了荧光猝灭。因此，BCN 可以准确检测 20 种痕量化学和生物活性分析物。此外，BCN 表现出优异的热稳定性和化学稳定性，不仅可以承受空气中的高温（300°C）加热，还可以抵抗恶劣酸（pH=0，HCl）和碱（pH=14，NaOH）中的长期腐蚀。这项工作为促进无等离子体和金属的半导体衬底的 SERS 性能的能带结构工程提供了新的见解。
