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
Nanoscience & Nanotechnology
Xingce Fan, Penghua Wei, Guoqun Li, Mingze Li, Leilei Lan, Qi Hao, Teng Qiu
Summary: By using the hot-electron injection strategy, a heterojunction array composed of plasmonic MoO2 and semiconducting WO3-x was designed to achieve unprecedented enhanced PICT efficiency between substrates and molecules. This approach not only achieved a record Raman enhancement factor among metal oxide substrates, but also enabled the ultrasensitive detection of target molecules.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Physics, Fluids & Plasmas
S. H. Cao, C. Ren
Summary: A series of simulations using particle-in-cell method reveals different paths of laser-plasma instability evolution in OMEGA-scale implosions, depending on the initial electron temperature. At low temperatures, two-plasmon decay dominates, while at high temperatures, stimulated Raman scattering becomes the dominant mode. However, regardless of temperature, two-plasmon decay still dominates in the steady state. The simulations also provide a scaling law for hot electron generation, which, combined with laser/plasma conditions, can predict their generation in implosions.
PHYSICS OF PLASMAS
(2023)
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
Engineering, Environmental
Changmin Park, Dohyun Lim, Seung Mo Kong, Nam-Il Won, Yang Ho Na, Dongha Shin
Summary: This study develops a cost-effective and time-efficient method for detecting nanoplastics, which have received significant attention due to their potential harm to the water environment. The study introduces a substrate that exhibits Surface-enhanced Raman scattering (SERS) activity and allows for the detection of nanoplastics on the substrate using darkfield-based strategy. The technique enables point-by-point detection of single nanoplastics and has universal application in establishing a global map of nanoplastics and advancing our understanding of the environmental life cycle of plastics.
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
Physics, Nuclear
W. Tornow, S. W. Finch, M. F. Kidd
Summary: Gamma-ray production cross-section data have been obtained for inelastic neutron scattering reactions involving Te-126, Te-128, and Te-130; Specifically, the study highlights potential issues related to 0 nu beta beta decay in Te-130.
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
Physics, Multidisciplinary
Shengxiang Wu, Yu Chen, Shiwu Gao
Summary: The study presents a model to describe vibrational excitation and bond dissociation induced by plasmonic hot carriers and finds that nonthermal electrons in the high energy region can provide an efficient and dominant channel for photodissociation, especially in the quantum plasmon regime. The model captures the wavelength dependence and reproduces enhancement factors observed in experiments for oxygen dissociation on silver nanoparticles, paving the way for harvesting nonthermal plasmonic energy for photocatalysis in the quantum regime.
PHYSICAL REVIEW LETTERS
(2022)
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, Multidisciplinary
Michael Hartelt, Pavel N. Terekhin, Tobias Eul, Anna-Katharina Mahro, Benjamin Frisch, Eva Prinz, Baerbel Rethfeld, Benjamin Stadtmueller, Martin Aeschlimann
Summary: This paper discusses the importance of understanding the differences between photon-induced and plasmon-induced hot electrons and proposes a method using a femtosecond pump-probe scheme combined with theoretical analysis to separate the energy and momentum distribution of plasmon-induced hot electrons.
Article
Engineering, Environmental
Longfei Zhang, Rongfang Zhao, Yanzhou Wu, Zhiyang Zhang, Yan Chen, Meichun Liu, Na Zhou, Yunqing Wang, Xiuli Fu, Xuming Zhuang, Jianping Wang, Lingxin Chen
Summary: In this study, a one-step synthesis method was developed to prepare silver nanoparticle substrates with ultralow SERS background using anionic ligands as stabilizing agents. The SERS substrate was successfully applied for the identification of organic pollutants and the detection of degradation intermediates. Machine learning algorithms and density functional theory calculations further improved the accuracy and reliability of identification.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Review
Chemistry, Physical
Chang Liu, Yanghua Lu, Runjiang Shen, Yue Dai, Xutao Yu, Kaihui Liu, Shisheng Lin
Summary: Hot carrier solar cells have the potential for high power conversion efficiency, but effectively utilizing hot carriers in materials is critical for improving performance.
Article
Chemistry, Multidisciplinary
Rivi J. Ratnaweera, Freddy A. Rodriguez Ortiz, Nicholas J. Gripp, Matthew T. Sheldon
Summary: This study investigates the dynamic alignment of colloidal CdSe/CdS nanorods in the presence of AC electric fields. The results identify two scales of interaction that lead to the field-driven optical response: the spontaneous self-assembly of the nanorods into structures with increased optical anisotropy at the mesoscale, and the macroscopic ordering of the nanorod assemblies along the direction of the applied AC field. The alignment of the nanorod ensembles improves with increasing nanorod concentration, indicating that mesoscale assembly facilitates the field-driven alignment.
Article
Chemistry, Multidisciplinary
Chih-Wei Wang, Connor Orrison, Dong Hee Son
Summary: This article reviews recent progress in the research on hot electron generation via upconversion and their application in photocatalytic reactions, highlighting the benefits of long-range transfer of energetic hot electrons.
BULLETIN OF THE KOREAN CHEMICAL SOCIETY
(2022)
Article
Chemistry, Multidisciplinary
Je-Ruei Wen, Freddy Alberto Rodriguez Ortiz, Anna Champ, Matthew T. Sheldon
Summary: This study demonstrates that the reaction kinetics of all-inorganic CsPbX3 nanocrystal growth can be significantly slowed by employing a dual injection strategy. This allows for the synthesis of highly uniform nanorods or cuboid nanocrystals with controllable size, aspect ratio, and crystal lattice structure.
Editorial Material
Optics
Yuzhe Xiao, Matthew Sheldon, Mikhail A. Kats
Summary: This article discusses how a heat-powered emitter can exceed the Planck thermal-emission limit, and argues that super-Planckian emission requires an energy distribution that is not consistent with a unique temperature.
Article
Biochemical Research Methods
Hong-Rae Kim, Ji-Hong Bong, Tae-Hun Kim, Seung-Shick Shin, Min-Jung Kang, Won-Bo Shim, Do Young Lee, Dong Hee Son, Jae-Chul Pyun
Summary: A one-step homogeneous immunoassay using the switching peptide H2 was developed for rapid detection of influenza viruses A and B. This method eliminates the need for washing steps and can be conducted in solution, with graphene used as a fluorescence quencher to enhance sensitivity.
Article
Chemistry, Physical
Xueting Tang, Daniel Rossi, Jinwoo Cheon, Dong Hee Son
Summary: Investigated the photoluminescence properties of strongly quantum confined CsPbBr3 quantum dots at low temperatures, and found that electronic coupling between dots can cause redshift of photoluminescence, narrowing of bright-dark exciton level splitting, and acceleration of photoluminescence decay.
CHEMISTRY OF MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Oscar Hsu-Cheng Cheng, Boqin Zhao, Zachary Brawley, Dong Hee Son, Matthew T. Sheldon
Summary: This study reports that modulating the polarization state of light can significantly decrease the plasmon damping of chiral plasmonic nanostructures. Under continuous wave optical excitation, the reflectance and optical field concentration increased by up to 8% and 35.7%, respectively. These effects were observed even in the presence of an external magnetic field. The decrease in plasmon damping is rationalized through the Lorentz forces acting on the circulating electron trajectories. These results provide strategies for actively modulating intrinsic losses in metals through optomagnetic effects encoded in the polarization state of incident light.
Article
Chemistry, Multidisciplinary
Chih-Wei Wang, Xiaohan Liu, Tian Qiao, Mohit Khurana, Alexey V. Akimo, Dong Hee Son
Summary: This study identifies Mn-doped CsPbBr3 nanocrystals as an excellent platform for hot electron upconversion, benefiting from the structural diversity of metal halide perovskites. Two-dimensional Mn-doped CsPbBr3 nanoplatelets are particularly advantageous in the upconversion process due to the strong exciton-dopant interaction, and evidence for hot electron upconversion via long-lived dark excitons is observed.
Article
Chemistry, Multidisciplinary
Moon-Ju Kim, Joo-Yoon Noh, Tae Gyeong Yun, Min-Jung Kang, Dong Hee Son, Jae-Chul Pyun
Summary: This study systematically investigates the effect of laser shock waves on the ionization of graphitic carbon nitride nanosheets, showing enhanced LDI-MS performance through modulation of charge carrier motion. The results provide a mechanistic understanding of ionization processes crucial for revealing the full potential of laser shock waves in LDI-MS.
Article
Chemistry, Physical
Xueting Tang, Mohit Khurana, Daniel Rossi, Lanyin Luo, Alexey V. Akimov, Dong Hee Son
Summary: Imposing strong quantum confinement in metal halide perovskite quantum dots not only tunes the exciton transition energy but also alters other photophysical properties. This study focused on the strongly quantum-confined formamidinium lead bromide quantum dots and compared them with cesium lead bromide quantum dots in terms of photoluminescence, fine structure, and decay dynamics.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Chemistry, Physical
Freddy A. Rodriguez A. Ortiz, Boqin Zhao, Je-Ruei Wen, Ju Eun Yim, Giselle Bauer, Anna Champ, Matthew T. Sheldon
Summary: In this study, the anisotropy of the complex dielectric function of CsPbBr3 nanorods was determined by analyzing the ensemble absorption spectra and spectral fluorescence anisotropy. The results show that quantum confinement gives rise to unique axis-dependent electronic features in the dielectric function, increasing the overall fluorescence anisotropy even in the absence of quantum confinement. Additionally, this study provides a strategy for obtaining anisotropic complex dielectric functions of colloidal materials with varying composition and aspect ratios using ensemble solution-phase spectroscopy.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Multidisciplinary
Tian Qiao, Madison E. E. Edwards, Xueting Tang, Xin Yan, Dong Hee Son
Summary: Despite the challenges posed by reverse charge transfer or charge recombination, cesium lead halide (CsPbX3) nanocrystals can selectively generate stable aminium or aminyl radicals from amines by controlling the imbalance of electron and hole populations achieved through varying the solvent composition. In the presence of dihalomethane, the irreversible removal of electrons enables efficient oxidative generation of aminium radicals. In the absence of dihalomethane, the availability of both electrons and holes leads to the production of aminyl radicals via sequential hole transfer and reductive N-H bond dissociation.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
News Item
Optics
Matthew Sheldon
Summary: Researchers have successfully overcome the challenge of detecting vibrations of individual molecules due to thermal noise by upconverting mid-infrared photons into visible light using nanophotonic cavities, enabling high-efficiency optical readout for single-molecule vibrational spectroscopy.
Article
Chemistry, Multidisciplinary
Noel Mireles Villegas, Josue C. Hernandez, Joshua C. John, Matthew Sheldon
Summary: We present a size-selective method for purifying and isolating perovskite CsPbBr3 nanocrystals (NCs) while preserving their surface chemistry and high photoluminescence quantum yields (PLQYs). By evaporating nonpolar co-solvents, the isolation procedure promotes the precipitation of a size-selected product. The resulting solution-phase superlattices (SLs) of NCs exhibit improved PLQYs and unique spectral absorption features, indicating the potential for achieving collective optoelectronic phenomena previously observed from solid-state assemblies.