A5089879301- Gold and Silver Nanoparticles Synthesis and Applications
- Plasmonic and Surface Plasmon Research
- Luminescence Properties of Advanced Materials
- Quantum Dots Synthesis And Properties
- Spectroscopy Techniques in Biomedical and Chemical Research
- Copper-based nanomaterials and applications
- Advanced biosensing and bioanalysis techniques
- Luminescence and Fluorescent Materials
- Advanced Photocatalysis Techniques
- Nanocluster Synthesis and Applications
- Seismic Imaging and Inversion Techniques
- Metamaterials and Metasurfaces Applications
- Photonic and Optical Devices
- Molecular Junctions and Nanostructures
- Nonlinear Optical Materials Studies
- Photonic Crystals and Applications
- Inorganic Fluorides and Related Compounds
- Nanoplatforms for cancer theranostics
- Spectroscopy and Chemometric Analyses
- Spectroscopy and Quantum Chemical Studies
- Random lasers and scattering media
- Solid State Laser Technologies
- Advanced Nanomaterials in Catalysis
- Protein Interaction Studies and Fluorescence Analysis
- Advanced Fiber Laser Technologies
Lanzhou University
2025
Shaanxi Normal University
2014-2024
Harbin University
2024
Dalian Ocean University
2024
China National Offshore Oil Corporation (China)
2020-2024
Xinjiang University
2024
Xi'an Shiyou University
2024
University of Shanghai for Science and Technology
2023
Shandong Provincial Communications Planning and Design Institute (China)
2023
China National Petroleum Corporation (China)
2022
With strong surface plasmons excited at the metallic tip, tip-enhanced Raman spectroscopy (TERS) has both high spectroscopic sensitivity and spatial resolution is becoming an essential tool for chemical analysis. It a great challenge to combine TERS with vacuum system due poor optical collection efficiency. We used our innovatively designed home-built (HV-TERS) investigate plasmon-driven in-situ reaction of 4-nitrobenzenethiol dimerizing dimercaptoazobenzene. The reactions can be controlled...
As a new class of photocatalysts, plasmonic noble metal nanoparticles with the unique ability to harvest solar energy across entire visible spectrum and produce effective conversion have been explored as promising pathway for crisis. The resonant excitation surface plasmon resonance allows collect photons form highly enhanced electromagnetic field, stored in field can induce hot carriers metal. electron-hole pairs ultimately dissipate by coupling phonon modes nanoparticles, resulting higher...
ADVERTISEMENT RETURN TO ISSUEPREVFeatureNEXTTip-Enhanced Raman SpectroscopyTip-enhanced spectroscopy (TERS), a combination of and apertureless near-field scanning optical microscopy using metallic tip which resonates with the local mode surface plasmon, can provide high-sensitive high-spatial-resolution analytical approach. The basic principle TERS, common experimental setups, various SPM technologies, excitation/collection configurations are introduced as well recent research progress...
Due to its amazing ability manipulate light at the nanoscale, plasmonics has become one of most interesting topics in field light–matter interaction. As a promising application plasmonics, surface-enhanced Raman scattering (SERS) been widely used scientific investigations and material analysis. The large enhanced signals are mainly caused by extremely electromagnetic that results from localized surface plasmon polaritons. Recently, novel SERS technology called remote reported, combining both...
Abstract The optically generated collective electron density waves on metal–dielectric boundaries known as surface plasmons have been of great scientific interest since their discovery. Being electromagnetic gold or silver nanoparticle’s surface, localised (LSP) can strongly enhance the field. These strong fields near metal surfaces used in various applications like enhanced spectroscopy (SES), plasmonic lithography, trapping particles, and catalysis. Resonant coupling LSPs to fluorophore...
We experimentally investigated remotely excited Raman optical activity (ROA) using propagating surface plasmons in chiral Ag nanowires. Using fmoc-glycyl-glycine-OH (FGGO) molecules, we first studied the local plasmon-enhanced ROA. found that intensity can be by left- and right-circularly polarized lights circular difference (CID) significantly enhanced. Second, selecting vibrational modes with large ROA intensities are not influenced chemical enhancements, imaging CID of FGGO molecules a...
We review our developed visualization method of charge transfer (CT) for chemical enhancement mechanism on surface‐enhanced Raman scattering (SERS) and tip‐enhanced spectroscopy (TERS). Firstly, we describe difference density, which provides direct visual evidence photoinduced CT. And then, using the CT, interpreted SERS TERS. Photoinduced in processes TERS can be clearly seen. Our a easy understanding way Copyright © 2014 John Wiley & Sons, Ltd.
Plasmonics is a well‐established field, exploiting the interaction of light and metals at nanoscale; with help surface plasmon polaritons, remote‐excitation can also be observed by using silver or gold plasmonic waveguides. Recently, catalysis was established as new exciting platform for heterogeneous catalytic reactions. Recent reports present reactions route to enhance rate chemical reactions, offer pathway control In this review, we focus on recent advanced waveguide First, synthesis...
Surface plasmons on isolated gold dimers can initiate intermolecular reactions of adsorbed p-nitrothiophenol. At the single molecule level when dimerization is not possible an intramolecular reaction be observed. Experimental evidence indicates that plasmon-induced hot electrons provide required activation energy.
In this paper, we present the construction of a high-vacuum tip-enhanced Raman spectroscopy (HV-TERS) system that allows in situ sample preparation and measurement. A detailed description prototype instrument is presented with experimental validation its use novel ex results using HV-TERS system. The includes three chambers held under 10−7 Pa vacuum. are an analysis chamber, fast loading chamber. chamber core contains scanning tunneling microscope (STM) detector coupled 50 × 0.5 numerical...
Heterogeneous catalysts play an important role in surface catalytic reactions, but selective bond breaking and control of reaction products processes remain significant challenges. High-vacuum tip-enhanced Raman spectroscopy (HV-TERS) is one the best candidates to realize reactions. Herein, HV-TERS was employed a new method dissociation by using hot electrons, generated from plasmon decay, as plasmonic scissors. In this method, N=N 4,4'-dimercaptoazobenzene selectively dissociated scissors,...
The nature of plasmon-driven chemical reactions is experimentally investigated using high vacuum tip-enhanced Raman spectroscopy (HV-TERS). It revealed that the coupling between tip and substrate can produce intense plasmon resonance, which then decays to sufficient hot electrons thus catalyses reaction. photoelectron emission from laser illuminated silver alone cannot drive
Experimental evidence is given of the breakdown Raman selection rules in high vacuum tip‐enhanced spectroscopy (HV‐TERS), where molecular Raman‐active, IR‐active, and overtone modes are simultaneously observed situ, due to strong near‐field gradient effects. Theoretical calculations firmly support our experimental multipole vibrational observation, ratio term over electric field dependent on both , which physical structure TERS structure, respectively, HV‐TERS. When molecule symmetric along...
Dimers and trimers of gold nanoparticles were synthesized using wet chemistry method for surface enhanced fluorescence Raman scattering. The dimers provide hot spots enhancing the signals, significantly obvious enhancement is obtained from signals in solution. Using finite element method, we calculate experimental system. Both theoretical results show that solution can be used micro-quantitative detection signals.
Vibrational modes and tip enhanced Raman spectroscopy (TERS) of cyclo[18]carbon were studied by density functional theory. The TERS images demonstrate the position CC bonds.
Localized laser cooling provides a new way to trap and manipulate small objects.
Plasmonic nanoparticles are ideal candidates for hot-electron-assisted applications, but their narrow resonance region and limited hotspot number hindered the energy utilization of broadband solar energy. Inspired by tree branches, we designed chemically synthesized silver fractals, which enable self-constructed hotspots multiple plasmonic resonances, extending generation hot electrons better matching with radiation spectrum. We directly revealed origin, spatial distribution, decay dynamics...
Electric field gradient quadrupole Raman modes are observed in plasmon-driven chemical reactions investigated with high vacuum tip-enhanced spectroscopy (HV-TERS). TER spectra reveal that 4-nitrobenzenethiol (4NBT) catalytically dimerizes to dimercaptoazobenzene (DMAB) under an HV-TERS setup. More importantly, we find the electric leads strong enhancement of infrared (IR)-active DMAB. The observation both Raman-active and IR-active DMAB provides spectral evidence for ultrasensitive analysis.
Plasmon-driven sequential chemical reactions were successfully realized in an aqueous environment. In electrochemical environment, driven by applied potential and laser irradiation. Furthermore, the rate of reaction was controlled via pH, which provides indirect evidence that hot electrons generated from plasmon decay play important role plasmon-driven reactions. acidic conditions, captured abundant H+ prevented reaction. The developed environment will significantly expand applications...
Abstract The nonlinear optical microscopies of coherent two-photon excited fluorescence and anti-Stokes Raman scattering are strongly enhanced by multiple surface plasmon resonances (MSPRs). Au@Ag nanorods presented strong MSPRs peaks at 800 400 nm, can enhance microscopy fundamental double frequencies, respectively. A two-dimensional (2D) material g-C 3 N 4 is employed to study the plasmon-enhanced femtosecond laser. electric analysis reveals that nanorod significantly signals up orders 10...
Plasmonic metal nanoparticles have the ability to harvest visible light and cause effective energy conversion, they are considered as promising catalysts drive chemical reactions. Although plasmonic catalysis has been widely used mediate reaction of organic molecules, mechanism contribution thermal hot carriers remains unclear. The is normally proposed dominant role catalysis, while effects often ignored, since molecules on surface unstable at high temperatures. Here, plasmon catalytic...