Ultrabroad spectral response and excellent SERS performance of PbS-assisted Au/PbS/Au nanostars,Nanoscale

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Ultrabroad spectral response and excellent SERS performance of PbS-assisted Au/PbS/Au nanostars
Nanoscale ( IF 5.8 ) Pub Date : 2022-11-16 , DOI: 10.1039/d2nr04666k
Jing-Ru Feng ₁ , Zhi-Rui Zhao ₁ , Zhong-Long Xiong ₁ , Hao-Sen Kang ₂ , Si-Jing Ding ₁ , Liang Ma ₂ , Li Zhou ₃

Affiliation

Noble metal nanomaterials have many excellent optical properties due to localized surface plasmon resonance induced by external electric and magnetic fields. The plasmon-enhanced optical properties of nanomaterials can be controlled by changing their shapes or compositions. Here, we use a gentle approach to synthesize Au/PbS/Au nanostars with multiple tips and explore the surface-enhanced Raman scattering (SERS) activity, the second harmonic generation (SHG), and photocatalytic performance. The Au/PbS/Au nanostars have ultrabroad spectral responses and significantly enhanced local electric fields near the sharp tips. The size and tip length of the Au/PbS/Au nanostars can be adjusted by changing the amount of HAuCl₄. The Au/PbS/Au nanostars exhibit largely enhanced SERS activity and photocatalytic degradation efficiency compared with the Au bipyramids and the Au BPs@PbS nanocrystals. In addition, the SHG of Au/PbS/Au nanostars is also significantly enhanced due to asymmetry and local field enhancement. This research shows potential in many applications ranging from photophysics to photochemistry.

中文翻译：

PbS 辅助 Au/PbS/Au 纳米星的超宽光谱响应和优异的 SERS 性能

由于外部电场和磁场引起的局部表面等离子体共振，贵金属纳米材料具有许多优异的光学特性。纳米材料的等离子体增强光学特性可以通过改变它们的形状或成分来控制。在这里，我们使用一种温和的方法合成具有多个尖端的 Au/PbS/Au 纳米星，并探索表面增强拉曼散射 (SERS) 活性、二次谐波产生 (SHG) 和光催化性能。Au/PbS/Au 纳米星具有超宽光谱响应，并且在尖锐尖端附近显着增强局部电场。Au/PbS/Au 纳米星的尺寸和尖端长度可以通过改变 HAuCl _{4的量来调整}. 与 Au 双锥体和 Au BPs@PbS 纳米晶体相比，Au/PbS/Au 纳米星表现出大大增强的 SERS 活性和光催化降解效率。此外，由于不对称性和局部场增强，Au/PbS/Au 纳米星的倍频也显着增强。这项研究显示了从光物理学到光化学的许多应用的潜力。

更新日期：2022-11-16

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