Long-Range Hexagonal Pore Ordering as the Key to Controlling SERS Efficiency in Substrates Based on Porous Alumina
Long-Range Hexagonal Pore Ordering as the Key to Controlling SERS Efficiency in Substrates Based on Porous Alumina
复制标题
长程六方孔有序是控制多孔氧化铝基底 SERS 效率的关键
DOI：
10.1021/acs.jpcc.0c02761
复制
发表时间：
2020
影响因子：
3.7
通讯作者：
J. J. Schneider
中科院分区：
文献类型：
--
作者：
M. Pashchanka;S. Okeil;J. J. Schneider
自组织多孔阳极氧化铝（PAA）层以前被认为是有效的表面增强拉曼散射（SERS）衬底，当涂有贵金属（如银或金）时，其表现出较高的增强因子。我们首次通过实验证明了PAA中的长程六边形有序是基于地形的SERS增强效应的基石。发现结构顺序和增强之间的相关性为具有高度可调相干诱导增强因子的SERS衬底的成本效益制造创造了新的可能性。这已经成功地实现了应用不同的阳极氧化持续时间和灵活调整平均有序畴尺寸。目前已有的关于长期恒电位阳极氧化对六方有序度的影响的资料相当不系统，有时甚至是相互矛盾的。因此，这项工作的相当一部分致力于更新这一知识，并制定了描述自排序演变的普遍基本原则，而不管所使用的电解质的性质如何。我们已经建立了一个典型的关系，纳米孔的平均数量包含在一个单一的相干域和阳极氧化时间。此外，这种可调表面图案与观测到的SERS增强效果之间的强相关性揭示了通过改进SERS活性热点的六边形排列来控制拉曼信号。
Self-organized porous anodic alumina (PAA) layers have been previously suggested as effective surface-enhanced Raman scattering (SERS) substrates, which exhibit high enhancement factors when coated with noble metals such as silver or gold. For the first time, we experimentally demonstrate that the long-range hexagonal ordering in PAA is a cornerstone of the topography-based SERS enhancement effect. The discovered correlation between structural order and enhancement creates a new possibility for cost-effective manufacturing of SERS substrates with highly tunable coherence-induced enhancement factors. This has been successfully achieved by applying different anodizing durations and flexible adjustment of the average well-ordered domain size. The currently available information about the impact of long-term potentiostatic anodizing on the degree of hexagonal ordering is rather unsystematic and sometimes even contradictory. Therefore, a considerable part of this work is devoted to the update of this knowledge and formulation of universal underlying principles describing the self-ordering evolution irrespective of the nature of the employed electrolyte. We have established a typical relationship between the average number of nanopores contained within a single coherent domain and the anodizing duration. Moreover, the strong correlation between such adjustable surface patterning and the observed SERS enhancement effect sheds light on Raman signal controlviaimproved hexagonal arrangement of SERS-active hotspots.
登录
查看更多内容
DOI：
10.1021/acsanm.0c02527
发表时间：
2020-10
期刊：
--
影响因子：
--
作者：
M. Pashchanka
通讯作者：
M. Pashchanka
影响因子：
--
作者：
Pashchanka, Mikhail;Schneider, Joerg J.
通讯作者：
Schneider, Joerg J.
影响因子：
3
作者：
Stepniowski, Wojciech J.;Norek, Malgorzata;Krol, Artur
通讯作者：
Krol, Artur
影响因子：
8.4
作者：
Ghorbani, M.;Nasirpouri, F.;Saedi, A.
通讯作者：
Saedi, A.
影响因子：
56.9
作者：
MASUDA, H;FUKUDA, K
通讯作者：
FUKUDA, K