Article
Chemistry, Multidisciplinary
Peng Zheng, Lintong Wu, Piyush Raj, Takayuki Mizutani, Miklos Szabo, William A. Hanson, Ishan Barman
Summary: Small molecules play a crucial role in physiological regulation and pathological diagnosis, but their detection is challenging. Plasmonic immunoassays based on SERS offer high sensitivity, but are limited by intensity fluctuations and false signals. To overcome these issues, a dual-modal single-antibody approach (INSPIRE) is proposed for small molecule detection, which enables better concentration prediction and reduction of signal artifacts.
Article
Chemistry, Physical
M. Moaied, K. Ostrikov, S. Palomba
Summary: Understanding the mechanisms of light-matter interactions in ultra-small plasmonic nanoparticles (USNP) is a challenging task due to the quantum effects and size dependence. The plasmon resonance in small metallic nanoparticles exhibits deviation from classical theory predictions, with noticeable frequency shifts to higher energy levels. This is attributed to the quantum nature of free charge carriers and the dynamic response of metallic nanoparticles to electromagnetic fields.
Article
Chemistry, Multidisciplinary
Kirill Khabarov, Emiliia Filalova, Messan Nouraldeen, Ekaterina Kameneva, Andrey Musaev, Sergei Tikhonov, Victor Ivanov
Summary: In this study, the influence of agglomeration degree of nanoparticles on the signal enhancement of surface-enhanced Raman spectroscopy (SERS) was investigated. It was found that structures formed mainly from non-agglomerated nanoparticles can enhance the SERS signal better. Aerosol nanoparticles modified by pulsed laser radiation show better results compared to thermally modified nanoparticles.
Article
Chemistry, Multidisciplinary
Runfang Fu, Daniel E. Gomez, Qianqian Shi, Lim Wei Yap, Quanxia Lyu, Kaixuan Wang, Zijun Yong, Wenlong Cheng
Summary: The study introduces a partial ligand-stripping strategy to fabricate elastomer-supported gold nanobipyramid plasmene nanosheets, which exhibit complex orientation-dependent plasmonic responses to external strains. Plasmonic spectra of approximately 45 degrees oriented samples are shown to be most susceptible to strain at acute polarized angles.
Article
Electrochemistry
Huihong Wu, Zhaoyuan Liu, Liangsheng Xu, Xin Wang, Qiang Chen, Kostya (Ken) Ostrikov
Summary: This study investigated the influence of solution pH on the formation of silver nanoparticles in a plasma electrochemical system. It was found that solvated electrons and hydrogen peroxide were responsible for the reduction of Ag+ at the solution anode and cathode, respectively, leading to the formation of AgNPs in specific pH conditions.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2021)
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
Optics
Havard S. Ugulen, Ranveig Flatabo, Mansoor A. Sultan, Jeffrey T. Hastings, Martin M. Greve
Summary: Plasmonic nanostructures have great potential for refractive index sensing applications, but their low quality-factor limits their use. By studying the coupling between gold nanoparticle gratings and a waveguide, we have developed a theoretical framework to describe these structures and successfully improve the quality-factor, leading to high sensitivity results.
Article
Materials Science, Multidisciplinary
Jose Luis Montano-Priede, Adnen Mlayah, Nicolas Large
Summary: This article presents a theoretical framework for investigating the interaction between acoustic vibrations and localized surface plasmons (LSPs) involved in resonant acoustic phonons Raman scattering. By introducing the concept of Raman energy density (RED), the authors show that RED can be mapped in the near-field region, providing a clear picture of the interaction between LSPs and acoustic vibrations.
Article
Materials Science, Multidisciplinary
Kaili Jiang, Xuecheng Shao, Michele Pavanello
Summary: Time-dependent orbital-free density functional theory, utilizing a nonlocal and nonadiabatic Pauli potential, accurately describes the optical spectra of metallic systems and semiquantitatively for semiconductors, offering wide applicability for nonequilibrium electron and electron-nuclear dynamics of complex materials.
Article
Chemistry, Multidisciplinary
Jesil Jose, Ludmilla Schumacher, Mandana Jalali, Georg Haberfehlner, Jan Taro Svejda, Daniel Erni, Sebastian Schluecker
Summary: This study investigates the quantum tunneling behavior of electrons across subnanometer gaps in gold nanosphere dimers of different sizes. The results show that the onset of quantum tunneling occurs at larger gap distances for larger dimers, due to the lower curvature of the particles leading to a larger effective conductivity volume in the gap. The findings have implications for precise control over plasmonic properties in various applications.
Article
Nanoscience & Nanotechnology
Antonio Minopoli, Emanuela Scardapane, Adriano Acunzo, Raffaele Campanile, Bartolomeo Della Ventura, Raffaele Velotta
Summary: The study simulates the optical response of functionalized gold nanoparticles and SARS-CoV-2 virions, revealing different configurations and emphasizing the importance of the proximity between functionalized gold nanoparticles and virions in avoiding the hook effect. Additionally, the study demonstrates the potential to achieve low virus detection limits through appropriate functionalization procedures.
Article
Chemistry, Physical
Fahri Alkan, Christine M. Aikens
Summary: The study investigates the effect of symmetry breaking via angle on plasmon coupling in nanorod assemblies of varying sizes and interparticle distances. Results show good agreement between TDDFT and dipole-dipole interaction model for larger interparticle distances, while charge-transfer plasmon modes may occur for smaller gap distances. The relative orbital overlap strength between monomeric energy levels plays a significant role in the intensity of coupled plasmons in symmetry-broken orientations.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Materials Science, Multidisciplinary
Tapan Barman, Libor Nozka, Vit Prochazka, Aleksandra Michalowska, Sylwia Turczyniak-Surdacka, Radim Ctvrtlik, Jan Krajczewski
Summary: Titanium nitride (TiN) has great potential as a non-metallic material in the field of surface-enhanced Raman spectroscopy (SERS). This study demonstrates the tunability of TiN's optical properties and its impact on SERS activity by controlling the surface morphology of TiN layers.
JOURNAL OF MATERIALS SCIENCE
(2023)
Article
Nanoscience & Nanotechnology
Li Shi, Florent Carn, Francois Boue, Eric Buhler
Summary: By electrostatic complexation between water-soluble semi-flexible polyelectrolytes and functionalized gold nanoparticles, colloidal crystals with different morphologies and compactness can be assembled. The assembled structure can have high short-range order at low ionic strength and crystalline order when screened by salt addition. This approach provides a low-cost and promising method for the one-step production of gold colloidal crystals with potential applications in nanophotonics.
ACS APPLIED NANO MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Xuri Wu, Feng Tan, Shizhu Cheng, Yangyang Chang, Xiaochun Wang, Lingxin Chen
Summary: In this study, three types of MXene Ti3C2Tx nanosheets were prepared using different etching methods, and their behavior after exposure to human plasma was investigated. The study found that nanosheets with protein coronas were more prone to aggregation, and proteomic analysis revealed significant differences in the composition and abundance of proteins in the coronas. A random forest classification model identified hydrogen bonding, steric hindrance, and hydrophobic interaction as the main driving forces for the adsorption of plasma proteins on Ti3C2Tx.
