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<p>Metal single atoms have been demonstrated to induce surface-enhanced Raman scattering (SERS) due to their effectiveness in the modification of electronic structure. However, precisely modulating the relative positions of metal single atoms on sub-nanolattices remains a formidable challenge, which makes SERS studies of metal single atoms dependent on localized environments still lacking. Herein, we rely on polyethylene glycol (PEG) as a soft template to achieve the modulation of the relative positions of W atoms on titanate nanotubes (W-TNTs) and probe the local-environment-dependent SERS induced by metal single atoms based on this technique. We find that the relative position of the W single atoms greatly affects their SERS performance. This phenomenon has been attributed to the difference in charge transfer ability between single W atoms of different configurations, with isolated W atoms inducing a significantly higher density of electronic states near the Fermi energy than associated W atoms, leading to an enhanced polarization of the probe molecule and subsequently a stronger Raman signal. Our findings demonstrate a technique to effectively control the relative positions of single atoms and provide insights into single-atom-induced SERS associated with localized environments, which will facilitate the rational design of SERS substrates based on metal single atoms.</p>

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Polymer-guided grafting of single W atoms onto titanate nanotubes increases SERS activity in semiconductors

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年8月28日

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  • Jinyu Zhou,
  • Xiuling Zha,
  • Siying Ma,
  • Sihui Wu,
  • Chunlan Ma,
  • Gaoyuan Chen,
  • Zhigang Chen,
  • Taoyang Zhang,
  • Zhiwei Chen,
  • Di Wang,
  • Yuxiang Yan,
  • Yuqing Sun,
  • Hengdong Ren,
  • Hongzhao Sun,
  • Xinglong Wu,
  • Zhigang Zhao,
  • Shan Cong

摘要

Metal single atoms have been demonstrated to induce surface-enhanced Raman scattering (SERS) due to their effectiveness in the modification of electronic structure. However, precisely modulating the relative positions of metal single atoms on sub-nanolattices remains a formidable challenge, which makes SERS studies of metal single atoms dependent on localized environments still lacking. Herein, we rely on polyethylene glycol (PEG) as a soft template to achieve the modulation of the relative positions of W atoms on titanate nanotubes (W-TNTs) and probe the local-environment-dependent SERS induced by metal single atoms based on this technique. We find that the relative position of the W single atoms greatly affects their SERS performance. This phenomenon has been attributed to the difference in charge transfer ability between single W atoms of different configurations, with isolated W atoms inducing a significantly higher density of electronic states near the Fermi energy than associated W atoms, leading to an enhanced polarization of the probe molecule and subsequently a stronger Raman signal. Our findings demonstrate a technique to effectively control the relative positions of single atoms and provide insights into single-atom-induced SERS associated with localized environments, which will facilitate the rational design of SERS substrates based on metal single atoms.