通过避雷针效应提高氧化钼纳米片的SERS灵敏度及其在检测亚甲基蓝中的应用,Nanotechnology

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通过避雷针效应提高氧化钼纳米片的SERS灵敏度及其在检测亚甲基蓝中的应用
Nanotechnology ( IF 2.9 ) Pub Date : 2020-03-13 , DOI: 10.1088/1361-6528/ab758b
Pinyun Ren ₁ , Weichang Zhou , Xianpei Ren , Xingang Zhang , Bin Sun , Yuanfu Chen , Qi Zheng , Jun Li , Wanli Zhang

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由于其高浓度的自由电子和低电阻率，MoO2 纳米材料显示出优异的表面增强拉曼散射 (SERS) 特性。然而，基于半导体的 SERS 的物理过程仍然难以捉摸，因为有许多因素会影响靠近半导体纳米材料的分子的局部电磁场强度和随后的拉曼强度。在此，我们研究了表面形态对氧化钼 SERS 的重要贡献。MoO3/MoO2纳米片(NSs)是通过氧化MoO2NS合成的，通过调节氧化时间可以控制MoO3的表面粗糙度。与氧化前的 MoO2NS 相比，MoO3/MoO2NSs 表现出更强的 SERS 信号，这有利于它们作为 SERS 底物用于检测痕量亚甲蓝 (MB) 分子。最小可检测浓度可达10-9M，最大增强因子（EF）约为1.4×105。同时，使用 MoO3/MoO2NSs 作为 SERS 基底也观察到了优异的信号再现性。模拟电场分布表明，由于波纹MoO3NSs间隙中的避雷针效应，形成了更强的电场增强。这些结果表明氧化钼的表面形貌可能比它们的氧化态在 SERS 信号增强中起更重要的作用。使用 MoO3/MoO2NSs 作为 SERS 基底也观察到了出色的信号重现性。模拟电场分布表明，由于波纹MoO3NSs间隙中的避雷针效应，形成了更强的电场增强。这些结果表明氧化钼的表面形貌可能比它们的氧化态在 SERS 信号增强中起更重要的作用。使用 MoO3/MoO2NSs 作为 SERS 基底也观察到了出色的信号重现性。模拟电场分布表明，由于波纹MoO3NSs间隙中的避雷针效应，形成了更强的电场增强。这些结果表明氧化钼的表面形貌可能比它们的氧化态在 SERS 信号增强中起更重要的作用。

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SERS sensitivity improvement of molybdenum oxide nanosheets via the lightning rod effect and application in detecting methylene blue

MoO2nanomaterials show superior surface-enhanced Raman scattering (SERS) property due to their high concentration of free electrons and low resistivity. However, the physical process of semiconductor-based SERS is still elusive because there are many factors to affect the local electromagnetic ﬁeld intensity and the subsequent Raman intensity of the molecules in close proximity to the semiconductor nanomaterials. Herein, we investigate the important contribution of surface morphology to the molybdenum oxide SERS. The MoO3/MoO2nanosheets (NSs) are synthesized by oxidizing MoO2NS, and the surface roughness of MoO3can be controlled through adjusting the oxidizing time. Compared with the MoO2NS before oxidizing, the MoO3/MoO2NSs exhibit much more strong SERS signal, which favors their application as a SERS substrate to detect trace amounts of methylene blue (MB) molecular. The minimum detectable concentration is up to 10-9M and the maximum enhancement factor (EF) is about 1.4×105. Meanwhile, excellent signal reproducibility is also observed using the MoO3/MoO2NSs as SERS substrate. Simulated electric field distribution shows that a stronger electric field enhancement is formed duo to the lightning rod effect in the gap of corrugated MoO3NSs. These results demonstrate that the surface topography of molybdenum oxide may plays a more important role than their oxidation state in SERS signal enhancement.

更新日期：2020-03-13

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