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
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
Chemistry, Multidisciplinary
Xueqing Yang, Yi Liu, Shiu Hei Lam, Jing Wang, Shizheng Wen, ChiYung Yam, Lei Shao, Jianfang Wang
Summary: In this study, a facile wet-chemistry approach was used for the selective deposition of zeolitic imidazolate framework-8 (ZIF-8) on anisotropic Au nanobipyramids (NBPs) and nanorods. ZIF-8 was selectively deposited at the ends and waist and around the entire surface of the elongated Au nanocrystals. The NBP-based nanostructures with end-deposited ZIF-8 exhibited the best surface-enhanced Raman scattering (SERS) performance, showing potential for molecular sensing, optical switching, and plasmonic catalysis.
Article
Nanoscience & Nanotechnology
Ming Lin, Mengdi Lu, Yuzhang Liang, Li Yu, Wei Peng
Summary: Localized surface plasmon resonance (LSPR) and lossy mode resonance (LMR) are simultaneously excited by gold nanoparticle (AuNP) arrays and top-coated polyelectrolyte layer on optical fibers, enhancing the sensitivity of the optical sensor. Thicker polyelectrolyte layer leads to higher refractive index sensitivity, and the optimized sensor with 50 nm AuNPs and 20 PAH/PSS bilayers shows improved stability and sensitivity.
ACS APPLIED NANO MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Yu Chen, Kai Yin, Yuxuan Xu, Min Liu, Han Huang, Fangping Ouyang
Summary: The remote excitation and remote-controlling of the localized surface plasmon resonance (LSPR) in a heterotype and hollow gold nanosheet (HGNS) is investigated using FDTD simulations. The LSPR wavelength and peak intensity in the HGNS depend on factors such as the polarization of the incident light and the symmetry of the heterotype structure. By optimizing the parameters, significant polar plots of the polarization-dependent LSPR peak intensity with various patterns are obtained, showing the potential applications in remote-controllable surface-enhanced Raman scattering (SERS), optical interconnects, and multi-channel waveguide switches.
Article
Chemistry, Multidisciplinary
Ruoqi Ai, Christina Boukouvala, George Lewis, Hao Wang, Han Zhang, Yunhe Lai, He Huang, Emilie Ringe, Lei Shao, Jianfang Wang
Summary: A simple method for reshaping immobilized Au nanoplates through plasma treatment is demonstrated, resulting in the formation of nearly periodic right pyramid arrays on the surface. The gaseous environment in the plasma-treatment system, specifically nitrogen-containing environments, plays a significant role in the reshaping process. The reshaped Au nanoplates exhibit enhanced optical properties, including higher refractive index sensitivities and increased surface-enhanced Raman scattering intensities.
Article
Chemistry, Multidisciplinary
Zhoutao Sun, Chen Kang, Xiaohui Fang, Hongmei Liu, Jinxin Guo, Xinping Zhang
Summary: Research demonstrates high sensitivity detection of crystal violet in aqueous solution using a capillary-based static liquid phase SERS method without the need for pre-functionalization, achieving an enhancement factor as high as 10^8 and a detection limit of 10^-9 M.
NANOSCALE ADVANCES
(2021)
Article
Chemistry, Multidisciplinary
Guiqing Wen, Yang Xiao, Shuxin Chen, Xinghui Zhang, Zhiliang Jiang
Summary: A new method for detecting trace Co2+ in water was developed in this study, which is fast, stable, sensitive, and specific with dual mode characteristics. The method has been successfully applied to the detection of Co2+ in industrial wastewater, tap water, and river water.
NANOSCALE ADVANCES
(2021)
Article
Materials Science, Ceramics
Istvan Csarnovics, Miklos Veres, Petr Nemec, Sandor Molnar, Sandor Kokenyesi
Summary: This study investigates the plasmon field enhanced light-induced changes in the amorphous Ge24Se76 layer incorporating Au nanoparticles, which influences the optical and structural properties of the material. The presence of gold nanoobjects enhances the Raman signal of the structure and the recording of the optical grating pattern into the layer.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2021)
Article
Materials Science, Multidisciplinary
Thi Huyen Trang Nguyen, Thi Mai Anh Nguyen, Cong Doanh Sai, Thi Hai Yen Le, Thi Ngoc Anh Tran, Thanh Cong Bach, Van Vu Le, Nguyen Hai Pham, An Bang Ngac, Viet Tuyen Nguyen, Thi Ha Tran
Summary: The research combined sputtering and post annealing methods to prepare gold nanoparticles with uniform distribution on cover glass substrates, and studied the effect of gold thickness on the formation of nanoparticles. The study also analyzed the impact of size, inter-distance, and morphology of gold NPs on plasmon properties using SEM and absorption spectroscopy. Different morphologies' enhancement capabilities were verified using FDTD technique, demonstrating the efficient performance of the prepared gold nanoparticles arrays as SERS substrates.
Article
Engineering, Electrical & Electronic
Ajay Kumar Agrawal, Akanksha Ninawe, Anuj Dhawan
Summary: This paper reports a significantly improved sensing response of a plasmonic sensor based on a nanopillar array separated from a thin film, operated using the Kretschmann configuration. The sensor shows high sensitivity and figure of merit for both localized and bulk sensing responses. It can be easily fabricated and has great potential for biosensing applications.
IEEE SENSORS JOURNAL
(2022)
Article
Materials Science, Multidisciplinary
Yu Chen, Min Liu, Han Huang, Fangping Ouyang
Summary: Multi-path remote-excited SERS can be achieved in a two-dimensional hollow gold nanosheet structure, where a hollow cavity is concentrically located in the middle of a gold nanosheet. The introduction of the hollow cavity allows for modulation of localized surface plasmon resonance and brings in a new coupling effect between different vertices. FDTD simulations show a red-shift of LSPR peak with the increase of cavity size. The remote signal of LSPR scattering can be significantly enhanced, by over 228%, 597%, and 1155% for dual-, triple-, and quad-path-excitation, respectively, under the optimum coupling polarization.
RESULTS IN PHYSICS
(2022)
Article
Chemistry, Physical
Rajeev K. Sinha
Summary: This study utilizes 4-aminothiophenol (4-ATP) functionalized silver nanorods (Ag NRs) to detect formaldehyde, acetaldehyde, and benzaldehyde. The detection mode includes localized surface plasmon resonance (LSPR) and surface-enhanced Raman scattering (SERS). The results show that LSPR can detect formaldehyde and acetaldehyde with a sensitivity of 0.96 and 0.79 Delta A/mM, respectively, while SERS can detect these aldehydes in concentrations as low as similar to 1 μM.
Article
Multidisciplinary Sciences
Hajir Hilal, Qiang Zhao, Jeongwon Kim, Sungwoo Lee, MohammadNavid Haddadnezhad, Sungjae Yoo, Soohyun Lee, Woongkyu Park, Woocheol Park, Jaewon Lee, Joong Wook Lee, Insub Jung, Sungho Park
Summary: This study demonstrates a new three-dimensional nanostructure with polarization-independent SERS activity, prepared through a precise synthesis method. This unique structure shows efficient interaction with light and analytes, providing new possibilities for optical-based sensing.
NATURE COMMUNICATIONS
(2022)
Article
Chemistry, Physical
Jieun Shin, Sungwoo Lee, Sungjae Yoo, Insub Jung, Soohyun Lee, Jeongwon Kim, Jiwoong Son, Ji-Eun Kim, Jae-Myoung Kim, Jwa-Min Nam, Sungho Park
Summary: To enhance the near-field focusing around nanoscale metal particles, we designed large-sized gold double nanorings with nanoscale gaps between them. These gaps resemble hot halos where single-particle surface-enhanced Raman scattering occurs. The synthesis of these gold nanohalos was achieved using a novel strategy based on hexagonal gold nanoplates as templates. The resulting nanohalos exhibited near-field focusing, confirmed by both experimental measurements and theoretical simulation. The study also revealed a correlation between the distances of intra-nanogaps and particle sizes of gold nanohalos on single-particle surface-enhanced Raman scattering, with high enhancement factors and reproducibility.
CHEMISTRY OF MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Sungeun Go, Sungjae Yoo, Jiwoong Son, Soohyun Lee, Jaewon Lee, Sungwoo Lee, Jeongwon Kim, Minsun Park, Woocheol Park, Jae-Myoung Kim, Jwa-Min Nam, Sungho Park
Summary: The development of a stepwise synthetic strategy for Au ring-in-a-triangle nanoframes is crucial for highly amplified near-field focusing and successful single-particle surface-enhanced Raman scattering (SERS). The presence of inscribed nanorings plays a significant role in enhancing the lightning rod effect. The evaluation of single-particle SERS and the construction of two-dimensional SERS substrates contribute to the outstanding linearity of the calibration curve and the lowest limit of detection.
Article
Chemistry, Multidisciplinary
Woongsun Choi, Eunhye Park, Seojin Bae, Kyung-Hak Choi, Sangeun Han, Kuk-Hui Son, Do Young Lee, Il-Joo Cho, Hyejeong Seong, Kyo Seon Hwang, Jwa-Min Nam, Jungkyu Choi, Hyojin Lee, Nakwon Choi
Summary: This study presents a novel technology, SWITCH, for PCR-free, multiplex SNP genotyping with a single reporting fluorophore. The technology successfully demonstrated 4-plex detection of warfarin-associated SNP targets with excellent specificity.
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.
Editorial Material
Chemistry, Multidisciplinary
Nanshu Lu, Jwa-Min Nam
Review
Chemistry, Multidisciplinary
Da Yeon Choi, Suhyun Kim, Jeong-Wook Oh, Jwa-Min Nam
Summary: DNA-modified gold nanoparticles play important roles in constructing three-dimensional assembly structures and biomedical applications. As ligand molecules, DNA strands can facilitate the building block function of gold nanoparticles due to their inherent bonding nature. Additionally, the negative electrostatic character of DNA backbones ensures the stability and robustness of colloidal gold nanoparticles in various aqueous environments. Therefore, DNA conjugation to gold nanoparticle surfaces is a crucial step for stabilizing, controlling, and utilizing DNA-modified gold nanoparticles, and the appropriate conjugation strategy should be chosen and implemented based on specific applications. This review discusses various DNA conjugation strategies to gold nanoparticles with different functional groups, as well as the importance of DNA grafting density and directional grafting strategies in constructing three-dimensional nanoparticle assembly structures through DNA hybridization.
BULLETIN OF THE KOREAN CHEMICAL SOCIETY
(2022)
Article
Chemistry, Multidisciplinary
Jae-Myoung Kim, Jiyeon Kim, Kyungin Choi, Jwa-Min Nam
Summary: Metal nanostructures with a tunable plasmonic gap are synthesized for various applications. A plasmonic nanostructure with tunable dual nanogaps, called Au dual-gap nanodumbbells (AuDGNs), is designed and synthesized with high yield. These AuDGNs enable label-free on-particle SERS detection assays and show high specificity and sensitivity without the need for Raman dyes.
ADVANCED MATERIALS
(2023)
Review
Chemistry, Multidisciplinary
Niko Hildebrandt, Mihye Lim, Namjun Kim, Da Yeon Choi, Jwa-Min Nam
Summary: Plasmonic metal nanoparticles and semiconductor quantum dots are widely used nanomaterials in optical biosensing and bioimaging. While their combination for fluorescence quenching via nanosurface energy transfer or Forster resonance energy transfer is common, metal-QD nanohybrids for plasmon-enhanced fluorescence have been less prevalent. This article discusses the challenges in optimizing distances, orientations, and spectral overlap for maximum plasmon-enhanced fluorescence and reviews the different nanomaterials, their combinations, and applications in advanced optical biosensing and bioimaging.
CHEMICAL COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Jiwoong Son, Gyeong-Hwan Kim, Yeonhee Lee, Chungyeon Lee, Seungsang Cha, Jwa-Min Nam
Summary: This article discusses the principles and applications of surface-enhanced Raman scattering (SERS) and focuses on the design principles and key issues of plasmonic nanoparticle substrates. The article highlights the limited controllability and uniformity of plasmonic nanoparticles, as well as the challenges in molecular modification chemistry and analytical protocols for SERS. The article also introduces recent advances in the uniform and controllable synthesis of plasmonic nanoparticle systems and the emerging machine learning-based analysis for quantitative SERS. Overall, this perspective provides insights into the challenges and potential solutions in utilizing plasmonic nanoparticle systems for reliable quantitative measurement of molecules.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Chemistry, Multidisciplinary
Jeongwon Kim, Sungwoo Lee, Jiwoong Son, Jieun Kim, Hajir Hilal, Minsun Park, Insub Jung, Jwa-Min Nam, Sungho Park
Summary: Rational design of plasmonic colloidal assemblies via bottom-up synthesis is challenging but can demonstrate unprecedented optical properties that are strongly related to the shape and spatial arrangement of the assembly. In this study, plasmonic cyclic Au nanosphere hexamers (PCHs) were successfully synthesized and showed excellent performance in single-particle surface-enhanced Raman scattering signals.
Article
Chemistry, Multidisciplinary
Kunlun Jiang, Jingrui Wu, Ji-Eun Kim, Sujin An, Jwa-Min Nam, Yung-Kang Peng, Jung-Hoon Lee
Summary: A novel plasmonic cross-linking colorimetric PCR (PPTccPCR) assay is proposed by integrating plasmonic magnetic nanoparticle (PMN)-based PPT-PCR with gold nanoparticle (AuNP) cross-linking colorimetry. This method enables visual detection of target DNA with concentrations as low as 5 copies/μL within 40 minutes. The simple and sensitive strategy does not require expensive instrumentation and has high potential for clinical diagnostic applications.
Article
Nanoscience & Nanotechnology
Sung Hun Park, Haedong Park, Jwa-Min Nam, Yonggang Ke, Tim Liedl, Ye Tian, Seungwoo Lee
Summary: Moulding the flow of phononic waves in 3D space is critical for controlling sound and thermal properties. DNA origami-designed 3D crystals can serve as hypersonic 3D phononic crystals (PnCs) with the widest complete phononic bandgap (PnBG). This provides a blueprint for the design and fabrication of mesoscale 3D PnCs with optimal lattice geometry.
Review
Chemistry, Physical
Eunhye Park, So Young Choi, Jieun Kim, Niko Hildebrandt, Jin Seok Lee, Jwa-Min Nam
Summary: This article introduces the important role of nanotechnology in the diagnosis and treatment of COVID-19. For SARS-CoV-2 and its variants, nanomaterial-based diagnostic and therapeutic strategies, including nucleic acid- and antigen-targeting diagnostic methods and viral activity suppression approaches, are discussed.
Review
Chemistry, Multidisciplinary
Seongchan Kim, Taegon Oh, Hyojin Lee, Jwa-Min Nam
Summary: This article reviews the various types of nanoparticles used as delivery vehicles in clinical therapeutic applications, discussing their advantageous properties and functions, as well as the issues and limitations. The strategies to overcome biological barriers and harsh physiological conditions are summarized, and green synthesis methods and their environmental impacts are introduced and discussed. The article also provides perspectives on the biocompatibility, toxicity and environmental consequences of nanoparticles developed for biomedical applications.
MATERIALS CHEMISTRY FRONTIERS
(2022)
Article
Chemistry, Multidisciplinary
Jingrui Wu, Kunlun Jiang, Hua Mi, Yuwei Qiu, Jiwoong Son, Hyun June Park, Jwa-Min Nam, Jung-Hoon Lee
Summary: Plasmonic PCR using metallic nanoparticles is cost-effective compared to traditional thermocycling, but its strong fluorescence quenching often requires additional post-processing steps. A rapid and sensitive plasmonic photothermal PCR (PPT-PCR) assay has been developed, combining magnetic bimetallic nanoparticles and fluorescence detection to detect DNA targets within 5.5 minutes, significantly reducing overall assay time.