Article
Optics
Sunny Tiwari, Adarsh B. Vasista, Diptabrata Paul, G. V. Pavan Kumar
Summary: This study reports the observation of mirror-enhanced directional surface-enhanced Raman scattering from a self-assembled monolayer of molecules coupled to a nanowire-nanoparticle junction. Placing the junction on a metallic mirror generates multiple gap plasmon modes that reduce the angular spread of molecular emission. The research shows implications in understanding plasmon hybridization in the momentum space and its effects on molecular emission.
Article
Optics
Yuanyuan Li, Pan Li, Meng Zhang, Dong Wang, Longkun Yang, Zhiqiang Guan, Zhipeng Li
Summary: The polarization of emitted light from nanowire-particle junction is investigated, and it is found that the correlations can be effectively modulated by the particle position and the gap between the nanowire and particle. The polarization behavior can be changed from polarization maintainer to rotator by adjusting the wire-particle gap, and by moving the particle along the wire, the polarization behaviors can be tuned from positive to negative correlation. These findings are explained by the hybridization of wire-particle coupled mode and propagating surface plasmon polariton modes.
Article
Chemistry, Multidisciplinary
Tomoko Inose, Shuichi Toyouchi, Shinnosuke Hara, Shoji Sugioka, Peter Walke, Rikuto Oyabu, Beatrice Fortuni, Wannes Peeters, Yuki Usami, Kenji Hirai, Steven De Feyter, Hiroshi Uji-i, Yasuhiko Fujita, Hirofumi Tanaka
Summary: Graphene nanoribbons (GNRs) have attracted tremendous attention for their potential in next-generation nanoelectronic devices. The authors recently discovered that unzipping from double-walled carbon nanotubes (DWNTs) can produce crystalline single-layered GNRs (sGNRs) with high yield. By using silver nanowire-based tip-enhanced Raman spectroscopy (TERS), the authors analyzed the single GNRs and found heterogeneity in defect density and edge structure, which provides deeper insights into the structure and reaction mechanism of unzipped GNRs.
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
Yanzhao Pang, Mingliang Jin
Summary: A highly aligned AgNW array film was prepared using a self-assembly method, which showed excellent signal reproducibility and detection ability at low concentrations. The uniform distribution of hot spots inside the AgNW substrate amplified the SERS signal.
Article
Chemistry, Analytical
Tao Xie, Pan Li, Jiazheng Wang, Ronglu Dong, Liangbao Yang
Summary: The catassembly method allows for the rapid and simple self-assembly of highly repeatable large-scale multilayers with small nanoparticles. The plasmonic multilayers formed using this method demonstrate high sensitivity and stability for SERS sensing applications.
ANALYTICAL CHEMISTRY
(2023)
Article
Chemistry, Analytical
Monica Ricci, Beatrice Fortuni, Raffaele Vitale, Qiang Zhang, Yasuhiko Fujita, Shuichi Toyouchi, Gang Lu, Susana Rocha, Tomoko Inose, Hiroshi Uji-I
Summary: The study introduced the use of silver nanowires as endoscopic probes for detecting intracellular Raman signals and proposed an advanced strategy to significantly enhance their performance. By uniformly forming gold structures on the smooth AgNW surface, high surface-enhanced Raman scattering efficiency was achieved, demonstrating applicability for molecular sensing in cells.
ANALYTICAL CHEMISTRY
(2021)
Article
Chemistry, Physical
Jamal Aziz, Naila Nasir, Ehsan Elahi, Awais Ali, Shahid Mehmood, Honggyun Kim, Deok-kee Kim, Arshad Saleem Bhatti
Summary: Metal/semiconductor nanocomposites have the potential to tune the optical and electrical properties of semiconductors at the nanometer scale. The resonant excitation of surface plasmons of metal nanoparticles can couple with semiconductors and tune their optical emissions. This study thoroughly examines the coupling of surface plasmons and excitons using temperature dependent photoluminescence and Raman spectroscopy in Au-NPs coated ZnO nanowires. The results demonstrate the potential applications of Au/ZnO composites in plasmonic based nanoelectronics for memory and neuromorphic applications.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Multidisciplinary
Soohyun Lee, Insub Jung, Jiwoong Son, Sungwoo Lee, Minsun Park, Ji-Eun Kim, Woocheol Park, Jaewon Lee, Jwa-Min Nam, Sungho Park
Summary: We report a synthetic approach for the fabrication of intertwined heterometallic nanorings, in which three differently sized metal rings overlap concentrically. The synthetic method allows control over the core ring component and tunable gap distance. The narrow circular nanogaps between inner and outer Au rings enhance electromagnetic near-field, enabling surface-enhanced Raman scattering at the single-particle level. In particular, when the middle ring component is Pt, the in situ SERS measurement of electrochemical reactions on Pt domains can be monitored due to the near-field focusing assisted by plasmonic Au nanorings.
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
Chemistry, Analytical
Tao Xie, Pan Li, Meihong Ge, Siyu Chen, Guangyao Huang, Junxiang Li, Meiting Gong, Shirui Weng, Liangbao Yang
Summary: A new SERS detection method based on the nano nest model is developed to autonomously capture molecules into hot spots, enabling high sensitivity detection of various molecules. This method can also be used for in situ monitoring of allergic reactions.
Article
Materials Science, Ceramics
Thi Ha Tran, Thi Mai Anh Nguyen, Vu Phuong Thao Dao, Cong Doanh Sai, Thanh Cong Bach, Nguyen Hai Pham, An Bang Ngac, Van Thanh Pham, Thi Kim Chi Tran, Hyeonsik Cheong, Viet Tuyen Nguyen
Summary: This study reports a facile process to fabricate CuO/Au core/shell nanowires, which show high sensitivity as SERS substrates capable of detecting methylene blue at concentrations as low as 10(-13) M. The major advantages of these SERS substrates are their sensitivity, uniformity, and purity without the presence of organic surfactants in the synthesis process.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Multidisciplinary
Si-Zhe Sheng, Shi-Qiao Zheng, Xue-Fei Feng, Ling-Ran Zhou, Zhen-Chao Tao, Jian-Wei Liu
Summary: This study provides a new strategy for assembling ordered structures of gold nanoparticles using highly ordered nanowire templates to explore the ordering effect on SERS performance. The highly ordered gold nanoparticle arrays show improved detection limit and enhancement factor compared to disordered gold particles.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Chemistry, Analytical
Yanyan Zhu, Xia Qiu, Xiaohu Chen, Mimi Huang, Yongxin Li
Summary: The development of new hot spots for surface enhanced Raman scattering (SERS) technique is important. In this study, a single Au nanowire (NW)-based nanosensor for adenosine triphosphate (ATP) sensing was developed using in-situ SERS technique. The nanosensor exhibited strong SERS signals and high sensitivity, selectivity, and stability for ATP sensing. This nanosensor can be used as an ideal platform for real applications, such as trace detection, single cell, and in vivo analysis.
Article
Spectroscopy
Yue-Jiao Zhang, Qing-Qi Chen, Xing Chen, An Wang, Zhong-Qun Tian, Jian-Feng Li
Summary: SHINERS technology uses silica-coated gold nanoparticles to overcome the limitations of SERS technology, while graphene as a two-dimensional material shows potential in SERS chemical enhancement. Au@G nanoparticles prepared by CVD can control the thickness of the graphene shell, and the Pt-on-Au@G satellite structures enable monitoring of catalytic reaction mechanisms.
JOURNAL OF RAMAN SPECTROSCOPY
(2021)
Review
Chemistry, Multidisciplinary
Lichun Sun, Yichuan Chen, Mengtao Sun, Youjin Zheng
Summary: Organic solar cells (OSC), which convert solar energy into electric energy using organic semiconductor materials, are an effective solution to the energy crisis and carbon emissions reduction. In this review, the development, working principles, performance parameters, and structural features of OSCs are briefly introduced and analyzed. Some breakthroughs related to OSCs are also highlighted.
CHEMISTRY-AN ASIAN JOURNAL
(2023)
Article
Chemistry, Physical
Ning Li, Mengtao Sun
Summary: In this paper, the optical and spectral properties of figure-of-eight helicene carbon nanohoop with Mobius topology are theoretically studied. The analysis is done using the visualization method of transition density matrix and charge density difference, revealing the unique characterization of carbon nanohoop with Mobius topology.
Article
Materials Science, Multidisciplinary
Haiyan Liu, Chenyu Li, Jing Li, Yuqing Cheng, Junfang Zhao, Jianing Chen, Mengtao Sun
Summary: In this paper, the physical mechanism of surface plasmons (SPs), fluorescence, fluorescence resonance energy transfer (FRET), and plasmon-enhanced FRET (PE-FRET) is reviewed. Furthermore, the latest research on PE-FRET in different systems, such as core-shell structure, nanorod, ultrathin film, etc., is highlighted. These PE-FRET properties have potential applications in optoelectronic devices, solar cells, biodetectors, sensors, etc. This work provides guidance for the applications of combining plasmonic effect and FRET.
APPLIED MATERIALS TODAY
(2023)
Article
Physics, Multidisciplinary
Yuqing Cheng, Mengtao Sun
Summary: This study investigates the optical properties of coupled metallic nanoparticles (MNPs) under vertical polarization, revealing unique characteristics such as three coupling coefficients, positive coupling terms, and blue-shifts of peaks with increasing coupling strength. The model shows that resonant MNPs exhibit a single blue-shifted mode, while non-resonant MNPs exhibit two splitting modes, one blue-shifted and one red-shifted. The relative intensity of the modes varies with coupling strength. Comparison with experimental results validates the model and enhances understanding of coupled MNPs for relevant applications.
NEW JOURNAL OF PHYSICS
(2023)
Article
Chemistry, Multidisciplinary
Jizhe Song, Yi Cao, Jun Dong, Mengtao Sun
Summary: In this paper, the energy bands, interlayer interactions, and thermoelectric effects of twisted bilayer borophene (TBB) synthesized on Ag (111) are theoretically studied. The results show the advantages of twistronics, where the high electrical conductivity and large Seebeck coefficient are regulated to the same range, leading to a significantly increased figure of merit (ZT) compared to bilayer borophene (BB) without twist. The TBB synthesized on Ag (111) film demonstrates strong coupling between TBB and Ag, making TBB a metallic 2D material with semiconducting and metallic borophene layers. TBB exhibits excellent thermoelectric efficiency due to charge transfer bonding, reduced electron localization, and the regulation of Seebeck coefficient, electrical conductivity, and ZT through twistronics, offering the possibility of applying TBB in thermoelectric devices.
Article
Spectroscopy
Yuqiang Wu, Mengtao Sun
Summary: In this paper, the optical properties of beta 1-phase borophene-black phosphorus heterostructures (BBPHs) were theoretically investigated using first principle calculations. The results showed that constructing BBPHs could enhance the stability of the crystal structure and significantly affect the optical properties compared to the individual borophene and black phosphorus monomers. The BBPHs exhibited excellent polarization characteristics in the visible or infrared region. These findings have important implications for the future application of optoelectronic devices based on two-dimensional heterostructures.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2023)
Article
Spectroscopy
Ning Li, Mengtao Sun, Shuo Cao
Summary: This paper presents a theoretical investigation on the optical absorption and molecular chirality of p-conjugated mechanically interlocked nanocarbons, using one photon absorption (OPA) and two photon absorption (TPA) as well as electronic circular dichroism (ECD) spectra. The study reveals the optical excitation properties and chirality resulting from interlocked mechanical bonds. TPA and ECD can effectively discriminate between interlocked and non-interlocked molecules, as well as differentiate [2]catenanes from [3]catenanes.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2023)
Article
Chemistry, Multidisciplinary
Xin Xie, Wenrou Yu, Zhaoxian Chen, Li Wang, Junjun Yang, Shihong Liu, Linze Li, Yanxi Li, Yingzhou Huang
Summary: Surface-enhanced Raman spectroscopy (SERS) combined with artificial intelligence (AI) has great potential in the early diagnosis of diseases by detecting volatile biomarkers in exhaled breath. A plasmonic-metal organic framework (MOF) nanoparticle, prepared from Ag nanowires (Ag NWs) coated with zeolitic imidazolate framework (ZIF), was used for the accurate diagnosis of oral cancer (OC). The AI algorithm, based on an artificial neural network (ANN) model, achieved a classification accuracy of 99% for SERS spectra of breath samples, with an AUC of 0.996 for OC prediction. This study demonstrates the potential of breath analysis combined with AI as a method for early-stage diagnosis of oral cancer.
Review
Chemistry, Multidisciplinary
Yichuan Chen, Mengtao Sun
Summary: Plexcitonics is an interdisciplinary field with great potential in the development of innovative optical technologies and devices. It focuses on the interactions between plasmons and excitons in hybrid systems. This review provides an overview of the fundamental principles of plasmonics and plexcitonics, and discusses recent advancements in the field, including the manipulation of plasmon-exciton interactions, tip-enhanced spectroscopy, and advancements in optical chirality and nonlinearity. These developments have spurred further research and inspire the design of advanced materials and devices with enhanced optical properties and functionalities.
Article
Chemistry, Physical
Ning Li, Mengtao Sun
Summary: It is crucial to investigate the optical properties and physical mechanisms of electron transitions in planar and pi-extended cyclic phenylenes (CPPs) with full armchair edges for nanoscience and nanotechnology. The optical properties of a planar and pi-extended ring extracted from the Au(111) surface are examined theoretically, based on the most recent experimental synthesis. The research findings reveal a blue-shift of absorption peaks in non-planar systems compared to planar systems, and demonstrate that fluorescence only occurs in open loops rather than closed loops using charge density differences and transition densities as evidence. The two-photon absorption (TPA) method is employed to achieve a transition from a weak excited state to a strong excited state, while the resonance Raman spectrum confirms the dark excited state of the non-planar closed loop. Additionally, non-planar charged systems exhibit a red-shift of absorption peaks compared to non-planar uncharged systems. The visualization of charge transfer through absorption and fluorescence spectroscopy is also investigated, providing valuable insights into the optical properties and potential design of optical nanodevices.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Chemistry, Physical
Jizhe Song, Mengtao Sun
Summary: This study investigates a twisted bilayer borophene (TBB) with a twist angle of 21.79 degrees on a Ag(111) film. The large cell size of the 21.79 degrees TBB creates favorable conditions for the short-range disordered phonon liquid state, leading to a decrease in thermal conductivity and excellent ZT values.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)
Article
Materials Science, Multidisciplinary
Rui Yang, Mengtao Sun
Summary: Borophene, a 2D material with excellent properties, has gained significant attention for its potential applications in various fields. Its unique properties make it an ideal candidate for device design and energy storage materials. Recent advances in its synthesis have opened up new possibilities for nanodevice applications.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
Article
Chemistry, Physical
Junao Zhang, Xin Xie, Xi He, Xiangnan Gong, Xin Zhang, Anping Liu, Yingzhou Huang
Summary: This study introduces a novel Cu-Ag@ZIF-8 film for the detection of gaseous molecules using Surface-enhanced Raman Spectroscopy (SERS). The film exhibits good performance and accurate identification of harmful gaseous molecules in complex volatile organic compounds (VOC).
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Applied
Xiumei Zhang, Jingru Yao, Xiangnan Gong, Jianfeng Sun, Runhui Wang, Li Wang, Liyu Liu, Yingzhou Huang
Summary: In this study, a glass fibre paper with Ag nanoparticles was used for electrodynamic enrichment, combined with paper electrophoresis and field amplification sample stacking, to achieve convenient and sensitive detection of Raman and surface-enhanced Raman spectroscopy (SERS). The method showed significant improvement in detection limit and could detect trace organic contaminants in aquaculture and food applications.
Article
Spectroscopy
Yu Chen, Lichun Sun, Mengtao Sun, Youjin Zheng
Summary: This paper presents a theoretical study on the optical properties of carbon nanobelts with various edges and interlocked structures, focusing on their chirality. The results show that two photon absorption and electronic circular dichroism techniques can effectively distinguish carbon nanoribbons with different boundaries, providing insights into their relationship and unique features. This research contributes to a better understanding of carbon nanoribbons, mechanically interlocked molecules, and chirality.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2024)
