Sahoo Smruti R, Ke Shyue-Chu
Department of Physics, National Dong Hwa University, Hualien 974301, Taiwan.
Nanomaterials (Basel). 2021 Feb 23;11(2):554. doi: 10.3390/nano11020554.
Despite their many advantages, issues remain unresolved over the variability in catalytic activities in supported gold nanoparticle (AuNP)-based catalysts, which requires precise characterization to unravel the presence of any fine features. Herein, upon analyzing the Au 4f core-level spin-orbit components in many as-synthesized AuNP-based catalysts, we observed that like deviations in the Au 4f binding energy positions, both the Au 4f-to-Au 4f peak intensity and linewidth ratios varied largely from the standard statistical bulk reference values. These deviations were observed in all the as-synthesized supported AuNPs irrespective of different synthesis conditions, variations in size, shape or morphology of the gold nanoparticles, and different support materials. On the other hand, the spin-orbit-splitting values remained almost unchanged and did not show any appreciable deviations from the atomic or bulk standard gold values. These deviations could originate due to alterations in the electronic band structures in the supported AuNPs and might be present in other NP-based catalyst systems as well, which could be the subject of future research interest.
尽管负载型金纳米颗粒（AuNP）基催化剂具有诸多优点，但基于该催化剂的催化活性变异性问题仍未得到解决，这需要进行精确表征以揭示任何精细特征的存在。在此，通过分析许多合成后的AuNP基催化剂中的Au 4f芯能级自旋轨道成分，我们观察到，与Au 4f结合能位置的偏差类似，Au 4f与Au 4f的峰强度和线宽比与标准统计体相参考值相比也有很大变化。在所有合成后的负载型AuNP中都观察到了这些偏差，无论合成条件如何、金纳米颗粒的尺寸、形状或形态如何变化以及载体材料如何不同。另一方面，自旋轨道分裂值几乎保持不变，与原子或体相标准金值相比没有显示出任何明显偏差。这些偏差可能源于负载型AuNP中电子能带结构的改变，也可能存在于其他基于纳米颗粒的催化剂体系中，这可能是未来研究的兴趣所在。
