Abstract
With the development of chiral materials, remarkable progress has been made in the application fields of biology, chemistry, and physics in the past decades. Here we develop a solo-Ag-nanowire (NW)-based, bottom-up chiral construction strategy to fabricate a chiral plasmonic film with strong chiroptical activity in the purple-blue band. Finite-difference time-domain simulations predict that helical structures made by Ag NWs with certain interlayer angles possess strong chiroptical intensity. We then apply a Langmuir-Blodgett technique to construct the layered NW assemblies with both handedness via regulating interlayer angle direction. The Ag NW assemblies show the interlayer-angle-and film-thickness-dependent circular dichroism, reaching the highest anisotropic factor of 0.03. These new chiral structures will serve as ideal candidates for chiral sensors thanks to their specific plasmonic properties.
摘要
随着数十年的研究, 手性材料在生物、化学、物理等领域的应 用取得了显著进展. 本文报道了一种基于纯银纳米线、自下而上的手 性构建策略, 用以制备在紫-蓝光能带中具有较强光学活性的手性等离 子体薄膜. 时域有限差分模拟预测了一定层间角的银纳米线螺旋结构 具有较强的手性光学活性. 我们采用Langmuir-Blodgett技术通过调节 层间角度和方向, 构建了具有左、右旋手性的层状纳米线组装结构. 银 纳米线组装体的圆二色性强度与层间角和膜厚相关, 其不对称因子最 高可达0.03. 这些新的手性结构由于特殊的等离子特性, 将成为手性传 感器的理想主体材料.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (22071226, 51732011, 21431006, 21761132008, 81788101, 11227901 and 11874164), the Funding of University of Science and Technology of China (KY2060000168 and YD2060002013), the Foundation for Innovative Research Groups of the National Natural Science Foundation of China (21521001), the Key Research Program of Frontier Sciences, CAS (QYZDJ-SSW-SLH036), and the Users with Excellence and Scientific Research Grant of Hefei Science Center of CAS (2015HSC-UE007). The authors thank Prof. Mingming Ma’s group at the University of Science and Technology of China for circular dichroism absorption spectrum test.
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Zhuang T and Yu SH supervised the project. Pang Y supervised the simulations. Zhuang T and Guo X conceived the idea and wrote the paper. Guo X carried out the experiments. Guo X and Li Y collected and analyzed the data. Wu D carried out the simulations. He Z, Wang JL, Zhang C and Pan Z helped to characterize the material structures. All authors discussed the results and assisted in manuscript preparation.
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The authors declare that they have no conflict of interest.
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Supporting data are available in the online version of the paper.
Xueru Guo received her BS degree from the College of Chemistry and Materials Science, Anhui Normal University in 2020. She is studying for a master’s degree at the Department of Chemistry, University of Science and Technology of China (USTC) under Prof. Taotao Zhuang’s supervision. Her research focuses on the chiral structure and function.
Dan Wu received her BS degree from the School of Optical and Electronic Information, Huazhong University of Science and Technology. She is currently a PhD candidate in the group of Prof. Pang at Huazhong University of Science and Technology. Her research focuses on the assembling of single-photon sources using nano-optical tweezers, and the integration of such sources into all-fiber systems.
Yi Li received his PhD degree under the supervision of Prof. Shu-Hong Yu at USTC in 2019. From 2019 to 2021, he worked as a postdoctoral fellow in Prof. Shu-Hong Yu’s group. He is currently a research associate at USTC. His research focuses on the synthetic chemistry, photophysics, and applications of novel one-dimensional semiconductor nanostructures.
Yuanjie Pang received his PhD degree from the Department of Electrical and Computer Engineering of the University of Victoria in 2012. He was a postdoctoral fellow at the University of Michigan during 2012–2015, and a postdoctoral fellow appointed by the University of Toronto during 2015–2018. He was appointed as a professor at Huazhong University of Science and Technology in 2018. His research interests include nano-optical tweezers and renewable energy storage.
Taotao Zhuang received his PhD degree in inorganic chemistry from USTC and then worked as a postdoc fellow at the University of Toronto. He was appointed as a professor in 2020 at USTC. Now he is trying to synthesize new inorganic chiral nanomaterials, understand the mechanism of structure-property, and realize the practical applications using homemade materials.
Shu-Hong Yu completed his PhD degree from USTC. In 2002, he was appointed as the Cheung Kong Professor. Currently, he leads the Division of Nanomaterials & Chemistry at Hefei National Laboratory for Physical Sciences at the Microscale, USTC. He was elected as an academician of Chinese Academy of Sciences in 2019. His research interests include bio-inspired synthesis and self-assembly of nanostructured materials and nanocomposites, and their related properties.
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Guo, X., Wu, D., Li, Y. et al. Ordering silver nanowires for chiroptical activity. Sci. China Mater. 65, 1362–1368 (2022). https://doi.org/10.1007/s40843-021-1899-6
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DOI: https://doi.org/10.1007/s40843-021-1899-6