Article
Nanoscience & Nanotechnology
Cheng Zong, Ji-Xin Cheng
Summary: Plasmon-enhanced stimulated Raman scattering (PESRS) microscopy has been developed to achieve single-molecule detection limit. The dispersive-like vibrational line shapes observed in PESRS can be explained by the interference between the local enhanced electromagnetic field induced by the plasmonic nanostructure and the molecular dipole-induced field. The PESRL and PESRG signals exhibit similar signal magnitudes but show reversed dispersive profiles under the same laser wavelength.
Article
Chemistry, Analytical
Cai-Feng Shi, Bo Zheng, Jian Li, Yue Zhou, Hai-Ling Liu, Saud Asif Ahmed, Kang Wang, Xing-Hua Xia
Summary: The study introduces an ultrabroadband plasmonic metamaterial absorber that can absorb 99% of incident light energy and excite plasmon resonance from ultraviolet to near-infrared range, enabling efficient plasmon-enhanced Raman scattering. The absorber exhibits high PERS performance with a detection limit of down to 10^(-12) M and excellent uniformity and reproducibility under various excitation sources, suggesting potential for cost-effective high-throughput production.
ANALYTICAL CHEMISTRY
(2021)
Article
Nanoscience & Nanotechnology
Lin Zhu, Zhen Meng, Saizhen Hu, Tiancong Zhao, Bing Zhao
Summary: The study focuses on the plasmonic coupling between noble-metal and semiconductor nanostructures, and reveals the enhanced charge transfer and surface-enhanced Raman scattering (SERS) signals in a designed W18O49/Ag heterostructure. A new coupled-plasmon-induced charge transfer mechanism is proposed, providing insight for further studies on plasmonic effects and interfacial charge transfer in metal/semiconductor heterostructures.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Nanoscience & Nanotechnology
Lin Zhu, Zhen Meng, Saizhen Hu, Tiancong Zhao, Bing Zhao
Summary: In this study, we for the first time observed and considered the plasmonic coupling between noble-metal and semiconductor nanostructures in metal/semiconductor heterostructures, using a W18O49/Ag heterostructure composed of Ag nanoparticles and W18O49 nanowires. The heterogeneous structure exhibited a broad and strong surface plasmon resonance (SPR) absorption in the visible wavelength range. Surface-enhanced Raman scattering (SERS) was used to investigate the interactions between metal SPR, semiconductor SPR, and the heterostructure's charge transfer process, revealing that the coupled SPR enhanced the heterostructure's internal charge transfer and SERS signals. A new coupled-plasmon-induced charge transfer mechanism was proposed to explain the improved charge transfer efficiency. This work provides insights for further studies on plasmonic effects and interfacial charge transfer in metal/semiconductor heterostructures.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Biophysics
Xiaohui Lu, Chanyu Yao, Linlin Sun, Zheng Li
Summary: MicroRNAs are reliable biomarkers for noninvasive detection of diseases, including cancers. Plasmon-enhanced biosensors are promising tools for miRNA analysis, using enhanced optical output to detect and analyze miRNA.
BIOSENSORS & BIOELECTRONICS
(2022)
Article
Chemistry, Physical
Hyun Jeong, Hyeong Chan Suh, Ga Hyun Cho, Rafael Salas-Montiel, Hayoung Ko, Ki Kang Kim, Mun Seok Jeong
Summary: In this study, a potential platform to enhance Raman scattering and increase the number of observable Raman modes in monolayer transition metal dichalcogenides (TMDs) was proposed. The platform consisted of large-scale arrays of gold micropillars (MPs), which were able to enhance the Raman intensity of TMDs and make difficult-to-detect Raman modes observable. The platform showed great industrial advantages and wide applicability due to its low cost, simple process, large controllable area, and short process time.
APPLIED SURFACE SCIENCE
(2024)
Article
Nanoscience & Nanotechnology
Runcheng Liu, Zhipeng Zha, Muhammad Shafi, Can Li, Wen Yang, Shicai Xu, Mei Liu, Shouzhen Jiang
Summary: The proposed HMM/Ag NPs platform allows for the excitation and utilization of BPP for SERS applications, with the Ag NPs providing strong plasmonic properties and acting as a light-matter coupler. Additionally, the platform successfully decouples BPP into localized surface plasmon using the nano antenna structure of Ag NPs, showing potential for surface-enhanced spectroscopy applications.
Article
Chemistry, Multidisciplinary
Brinton King Eldridge, Saghar Gomrok, James W. Barr, Elise Anne Chaffin, Lauren Fielding, Christian Sachs, Katie Stickels, Paiton Williams, Yongmei Wang
Summary: Gap-enhanced Raman tags are a new type of optical probe that utilize the strong electric field inside the gap between two plasmonic metals to enhance the surface-enhanced Raman scattering response. Our study investigated Au@SiO22@Au nanoparticles with varying shell and gap thicknesses and found that the near-field enhancement spectra inside the gap were stronger than on the outer surface of the nanoparticle. We also discovered that a thin shell combined with a thin gap produced the greatest near-field enhancement.
Article
Chemistry, Multidisciplinary
Y. Liu, L. Xu, N. Zhang, J. Wang, X. Mu, Y. Wang
Summary: Cu nanoparticles and single-atom Cu-supported attapulgite/polymer carbon nitride (PCN) photocatalyst were successfully synthesized via calcination. The introduction of C equivalent to N triple bond defect structure into PCN suppressed electron recombination and improved photocatalytic efficiency. Doping of single-atom Cu further promoted carrier separation and reduced the bandgap. Synergistic effects of Cu nanoparticles and single-atom Cu enhanced photocatalytic performance, resulting in a degradation rate 7.7 times higher than PCN.
MATERIALS TODAY CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Cla Duri Tschannen, Martin Frimmer, Thiago L. Vasconcelos, Lei Shi, Thomas Pichler, Lukas Novotny
Summary: This paper demonstrates the use of tip-enhanced Raman scattering (TERS) to enhance the Raman response of a single carbyne chain. The study observes a significant increase in scattering and discusses the role of coherent Stokes-anti-Stokes scattering mediated by an excited phonon. The resonance effects and laser-induced heating are also discussed, along with potential opportunities.
Article
Chemistry, Analytical
Chuhong Zhu, Qiangsheng Zhao, Xiujuan Wang, Zhongbo Li, Xiaoye Hu
Summary: In this study, a functional SERS system was developed for sensitive detection of target analytes using concentration of analyte molecules on or nearby plasmonic nanostructures. The composite film of Ag-nanocubes/graphene-oxide/Au-nanoparticles on a hydrophobic surface effectively accumulated analyte molecules for enhanced SERS activity. The system showed promising applications in food safety inspection and environmental pollutant monitoring.
MICROCHEMICAL JOURNAL
(2021)
Article
Materials Science, Multidisciplinary
Arpan Dutta, J. Jussi Toppari
Summary: Organic thin film based excitonic nanostructures have shown great potential in resonant nanophotonics as an alternative to plasmonic systems. The concentration of excitonic molecules in the film plays a crucial role in realizing surface excitonic modes and optimizing their optical performance. Our study investigates the effect of molecular concentration on various surface excitonic modes and their performance in sensing and spectroscopy. The results show that the optical performance of excitonic systems can be tuned by adjusting the molecular concentration, unlike plasmonic systems. This research provides valuable information for the development of novel excitonic nanodevices in organic nanophotonics.
OPTICAL MATERIALS EXPRESS
(2023)
Article
Physics, Multidisciplinary
Huan Pei, Changjian Yu, Jialu Qi, Jiaxin Zhao, Weifeng Peng, Jiale Zhang, Yong Wei
Summary: In this study, we investigated the influence of quantum tunneling on the plasmon-enhanced electric field and photoluminescence spectroscopy in the subnanometer nanogap between two adjacent Ag nanoparticles using the quantum-corrected method. Our results demonstrate the high sensitivity of the quantum-induced effect and nonlocal dielectric response to the separation distance. In cases of shorter separation distances, the localized fields start to decrease due to tunneling current short circuit, resulting in a substantial reduction in Raman enhancement and fluorescence intensity in narrowing gaps.
Article
Optics
Qiyuan Dai, Yong Wei, Weiqi Ma, Li Li, Huan Pei
Summary: This study systematically investigates the influence of thin 2D molybdenum disulfide (MoS2) films on the surface-enhanced Raman scattering (SERS) properties of a silver (Ag) nanocavity. The results show that the presence of MoS2 film enhances the plasmonic coupling between the nanocavity and the substrate, leading to significant SERS enhancement. Thinner MoS2 film and shorter nanocavity-film distance further improve the enhancement. Additionally, the spatial resolution of Raman spectroscopy can be improved by reducing the nanocavity radius.
OPTICS COMMUNICATIONS
(2022)
Article
Physics, Condensed Matter
Yong Wei, Huan Pei, Baoxin Yan, Yanying Zhu
Summary: In this study, the SERS properties of triangular plate dimer (TPD) with different materials in different spectral regions were theoretically investigated. It was found that the tip radian and dimer distance play a dominant role in the electric field enhancement, while the aspect ratio mainly tunes the peak position of the electric field. Adjusting the parameters can change the peak position of the electric field without significantly altering the peak value, and it can achieve electric field tuning from ultraviolet to near-infrared range. The research results provide important theoretical guidance for the optimization of TPD substrates in SERS experiments.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2022)
