铁电调制氧化石墨烯的费米能级以增强SERS响应

IF 15.3 1区 物理与天体物理 Q1 OPTICS Opto-Electronic Advances Pub Date : 2023-01-01 DOI:10.29026/oea.2023.230094
Mingrui Shao, Chang Ji, Jibing Tan, Baoqiang Du, Xiaofei Zhao, Jing Yu, Baoyuan Man, Kaichen Xu, Chao Zhang, Zhen Li
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引用次数: 1

摘要

基于化学机理(CM)的表面增强拉曼散射(SERS)衬底由于其优异的化学稳定性、均匀的分子吸附和可控的分子取向,以稳定和可重复的信号输出而受到广泛关注。然而,如何在同一衬底上对不同带结构的不同分子实现最佳的SERS信号仍然是一个巨大的挑战。在此,我们展示了一种通过铁电极化的氧化石墨烯(GO)能带调节策略,以促进电荷转移过程,从而提高SERS活性。通过调节铁电极化方向或铁电衬底温度,可以灵活地控制氧化石墨烯的费米能级。实验采用开尔文探针力显微镜(KPFM)对氧化石墨烯的Ef进行了定量分析。理论上,密度泛函理论计算也进行了验证所提出的调制机制。因此,不同带结构探针分子(R6G、CV、MB、PNTP)的SERS响应可以通过改变极化方向或温度来改善,而无需重新设计SERS底物。这项工作为基于CM的SERS衬底设计提供了新的见解,并有望应用于其他二维材料。
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Ferroelectrically modulate the Fermi level of graphene oxide to enhance SERS response
Surface-enhanced Raman scattering (SERS) substrates based on chemical mechanism (CM) have received widespread attentions for the stable and repeatable signal output due to their excellent chemical stability, uniform molecular adsorption and controllable molecular orientation. However, it remains huge challenges to achieve the optimal SERS signal for diverse molecules with different band structures on the same substrate. Herein, we demonstrate a graphene oxide (GO) energy band regulation strategy through ferroelectric polarization to facilitate the charge transfer process for improving SERS activity. The Fermi level (Ef) of GO can be flexibly manipulated by adjusting the ferroelectric polarization direction or the temperature of the ferroelectric substrate. Experimentally, kelvin probe force microscopy (KPFM) is employed to quantitatively analyze the Ef of GO. Theoretically, the density functional theory calculations are also performed to verify the proposed modulation mechanism. Consequently, the SERS response of probe molecules with different band structures (R6G, CV, MB, PNTP) can be improved through polarization direction or temperature changes without the necessity to redesign the SERS substrate. This work provides a novel insight into the SERS substrate design based on CM and is expected to be applied to other two-dimensional materials.
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来源期刊
CiteScore
19.30
自引率
7.10%
发文量
128
期刊介绍: Opto-Electronic Advances (OEA) is a distinguished scientific journal that has made significant strides since its inception in March 2018. Here's a collated summary of its key features and accomplishments: Impact Factor and Ranking: OEA boasts an impressive Impact Factor of 14.1, which positions it within the Q1 quartiles of the Optics category. This high ranking indicates that the journal is among the top 25% of its field in terms of citation impact. Open Access and Peer Review: As an open access journal, OEA ensures that research findings are freely available to the global scientific community, promoting wider dissemination and collaboration. It upholds rigorous academic standards through a peer review process, ensuring the quality and integrity of the published research. Database Indexing: OEA's content is indexed in several prestigious databases, including the Science Citation Index (SCI), Engineering Index (EI), Scopus, Chemical Abstracts (CA), and the Index to Chinese Periodical Articles (ICI). This broad indexing facilitates easy access to the journal's articles by researchers worldwide. Scope and Purpose: OEA is committed to serving as a platform for the exchange of knowledge through the publication of high-quality empirical and theoretical research papers. It covers a wide range of topics within the broad area of optics, photonics, and optoelectronics, catering to researchers, academicians, professionals, practitioners, and students alike.
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