Article
Chemistry, Multidisciplinary
Yanfang Hu, Yonglong Li, Linfeng Yu, Yuying Zhang, Yuming Lai, Wei Zhang, Wei Xie
Summary: A universal assembly methodology for preparing hetero-superstructures is introduced in this study, enabling the assembly of building block materials without the need for molecular linkers and utilizing surface property modulation to achieve self-organization. The resulting superstructures exhibit superior photocatalytic activity and Raman scattering performance.
Article
Materials Science, Multidisciplinary
Mohammed Alsawafta
Summary: In this study, the optical properties and plasmonic coupling features of a compositionally asymmetric nanorod dimer were investigated using Finite-difference time-domain (FDTD) electromagnetic simulation tool. The results showed both red and blueshift in the longitudinal mode excited in the Ag rod as the two nanorods were longitudinally shifted away from each other. The resonance energy of the Ag rod was observed to have almost no dependency on the gap spacing while the resonance wavelength of the Au rod exhibited a blue shift with increasing gap spacing.
JOURNAL OF MATERIALS SCIENCE
(2022)
Article
Chemistry, Multidisciplinary
Shi Xuan Leong, Charlynn Sher Lin Koh, Howard Yi Fan Sim, Yih Hong Lee, Xuemei Han, Gia Chuong Phan-Quang, Xing Yi Ling
Summary: The study successfully achieves direct, label-free SERS sensing of biologically important enantiomers by synergizing asymmetric nanoporous gold (NPG) nanoparticles with electrochemical-SERS. This strategy is versatile and can be readily extended to detect various enantiomers, and allows for multiplex quantification of enantiomeric ratios with excellent predictive performance. The research offers a paradigm shift in achieving label-free chiral SERS sensing of various enantiomers.
Article
Chemistry, Multidisciplinary
Xuxing Lu, Deep Punj, Michel Orrit
Summary: In this study, we demonstrated the single-molecule fluorescence enhancement of two-photon excitation by single end-to-end self-assembled gold nanorod dimers. By using biotinylated streptavidin as the molecular linker, we connected two gold nanorods together in a suitable gap size for the access of fresh dyes. Simulations showed that the plasmonic hot spots achieved more than 7 orders of magnitude enhancement for two-photon-excited fluorescence. With such high enhancements, we successfully detected the two-photon-excited fluorescence of a common organic dye (ATTO 610) at the single-molecule, single-nanoparticle level.
Article
Nanoscience & Nanotechnology
Suhyeon Park, Cheongwon Bae, Jaedeok Lee, Jeongeon Kim, Ming Lin, Juyeong Kim
Summary: This study demonstrates the preparation of finite assemblies of anisotropic gold nanorods through encapsulation by a zeolitic imidazolate framework-8 (ZIF). The assembled nanorods were found to form separate bundles aligned side-by-side, with each bundle serving as a nucleation center for a cube-shaped ZIF domain. The assembly pattern and shell dimension were shown to be controllable by adjusting the concentrations of cysteamine and surfactant, indicating potential for tailored applications of these assemblies.
ACS APPLIED NANO MATERIALS
(2021)
Article
Chemistry, Physical
Chih-Feng Wang, Mikhail Zamkov, Patrick Z. El-Khoury
Summary: This study achieves record spatial resolution in ambient tip-enhanced photoluminescence (TEPL) from CdSe/ZnS semiconductor quantum dots by taking advantage of surface roughness at the apex of a sputtered plasmonic gold probe. The reproducibility of observations is demonstrated using different plasmonic probes and samples. The high spatial resolution in TEPL is attributed to field enhancement at the metal tip-fluorophore interface.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Chemistry, Physical
Jing Guan, Shuo Wu, Linfang Li, Xiuyun Wang, Wei Ji, Yukihiro Ozaki
Summary: This research investigates the effect of charge-transfer at plasmonic nanostructure interfaces on hot-electron generation, revealing it to be a primary determinant of hot-electron-induced oxygen activation on large Au NP surfaces.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Jessi E. S. van der Hoeven, Harith Gurunarayanan, Maarten Bransen, D. A. Matthijs de Winter, Petra E. de Jongh, Alfons van Blaaderen
Summary: The study introduces a new type of functional assembly called supraparticles, which are formed by the solvent-driven assembly of silica-coated gold nanorods into spherical ensembles. The plasmonic coupling and mass transport are controlled by adjusting the thickness and porosity of the silica shells. These novel materials have the potential to play an important role in sensing applications.
ADVANCED FUNCTIONAL MATERIALS
(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
Dan Liu, Haibin Tang, Yupeng Yuan, Chuhong Zhu
Summary: Surface-enhanced Raman scattering (SERS) spectroscopy provides sensitive rapid detection of molecules. A simple and effective method using seed-assisted electrodeposition is developed for fabricating a 3D SERS substrate composed of multilayer Au nanoparticles. The resulting multilayer Au nanoparticles-assembled film shows high SERS sensitivity, good spectral uniformity, and reproducibility, with a low detection limit for rhodamine 6G. Moreover, it is also effective in detecting organic pollutants such as crystal violet and methylene blue.
MICROCHEMICAL JOURNAL
(2023)
Article
Chemistry, Physical
Junqi Li, Jingguo Wu, Jixiang Chen, Shan Huang, Jian Liu, Feng Gao, Ying Wang, Baoliang Sun, Dan Yu, Jingyi Sun
Summary: The synthesized detector based on self-assembled AuNR array substrate offers promising potential for dual detection of TNF-alpha and GFAP with high sensitivity, reproducibility, stability, and accuracy, which is critical for early diagnosis and evaluation of spinal cord injury (SCI).
SURFACES AND INTERFACES
(2022)
Article
Nanoscience & Nanotechnology
Alei Dang, Yuchen Wang, Huiqin Zhang, Weerapha Panatdasirisuk, Yu Xia, Zongyu Wang, Deep Jariwala, Tiehu Li, Shu Yang
Summary: This paper presents a new method for using nanofibers as surface-enhanced Raman scattering (SERS) substrates, which exhibit superior performance in terms of high sensitivity, good uniformity, and stability. The nanofiber substrates can be applied in various fields such as chemical and environmental monitoring, as well as food safety.
ACS APPLIED NANO MATERIALS
(2022)
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
Chemistry, Physical
Murari Singh, Zachary M. Sherman, Delia J. Milliron, Thomas M. Truskett
Summary: Gel assemblies of functional nanoparticles offer promise as versatile materials platforms. In this study, a mutual polarization method and a coarse-grained model were used to study the behavior of plasmonic linker gels. The simulation results demonstrate the capability to modulate the spectral features and mechanical properties of the gel by selecting different linkers.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Chemistry, Multidisciplinary
Yanjun Yang, Chunyuan Song, Jingjing Zhang, Jie Chao, Hoang Mai Luong, Yiping Zhao, Lianhui Wang
Summary: This article introduces a surface-enhanced Raman scattering (SERS) sensor based on a functionalized multiple-armed tetrahedral DNA nanostructure, which is capable of detecting multiple nucleic acid and protein biomarkers related to lung cancer and has enhanced sensitivity. The sensor achieves enhanced Raman signals through DNA self-assembled gold nanoparticle clusters in multiplex detections.
