A5086523999- Gold and Silver Nanoparticles Synthesis and Applications
- Quantum Dots Synthesis And Properties
- Physics of Superconductivity and Magnetism
- Chalcogenide Semiconductor Thin Films
- Advanced biosensing and bioanalysis techniques
- Plasmonic and Surface Plasmon Research
- Particle physics theoretical and experimental studies
- Copper Interconnects and Reliability
- Nanocluster Synthesis and Applications
- Quantum Chromodynamics and Particle Interactions
- ZnO doping and properties
- Electrocatalysts for Energy Conversion
- Magnetic properties of thin films
- Biosensors and Analytical Detection
- High-Energy Particle Collisions Research
- Copper-based nanomaterials and applications
- Ferroelectric and Piezoelectric Materials
- Photorefractive and Nonlinear Optics
- Advanced Photocatalysis Techniques
- Advanced Chemical Sensor Technologies
- Semiconductor materials and devices
- Electrochemical Analysis and Applications
- Gas Sensing Nanomaterials and Sensors
- Photonic and Optical Devices
- Nanomaterials for catalytic reactions
University of Connecticut
2016-2025
China University of Geosciences
2024-2025
Southwest University
2024
Southeast University
2023-2024
Hunan University
2023
State Key Laboratory of Chemobiosensing and Chemometrics
2023
Jiangxi University of Science and Technology
2021-2023
Nanjing University
2022
Linyi University
2022
Hainan University
2022
The localized surface plasmon resonance (LSPR) of oxide-free Cu nanoparticles fabricated by nanosphere lithography is examined UV−vis extinction spectroscopy and electrodynamics theory. LSPR the significantly affected presence copper oxides removal oxide species yields a dramatic difference in observed LSPR. From comparison Cu, Ag, Au similar geometry, we conclude that displays an intense narrow peak comparable to Ag Au.
After its discovery more than 30 years ago, surface-enhanced Raman spectroscopy (SERS) was expected to have major impact as a sensitive analytical technique and tool for fundamental studies of surface species. Unfortunately, the lack reliable reproducible fabrication methods limited applicability. In recent years, SERS has enjoyed renaissance, there is renewed interest in both fundamentals applications SERS. New techniques nanofabrication, design substrates that maximize electromagnetic...
This Account provides an overview of the methods that are currently being used to study electromagnetics silver and gold nanoparticles, with emphasis on determination extinction surface-enhanced Raman scattering (SERS) spectra. These have proven be immensely useful in recent years for interpreting a wide range nanoscience experiments providing capability describe optical properties particles up several hundred nanometers dimension, including arbitrary particle structures complex dielectric...
MoS<sub>2</sub> nanocage anodes synthesized by a bubble-template-assisted method can provide large expandable area to stabilize the electrode structure during cycling.
Quantum dots show great promise for fabrication of hybrid bulk heterojunction solar cells with enhanced power conversion efficiency, yet controlling the morphology and interface structure on nanometer length scale is challenging. Here, we demonstrate quantum dot-based improved electronic interaction between donor acceptor components, resulting in significant improvement short-circuit current open-circuit voltage. CdS were bound onto crystalline P3HT nanowires through solvent-assisted...
A new method to stabilize and functionalize surfaces for surface-enhanced Raman spectroscopy (SERS) is demonstrated. Atomic layer deposition (ALD) used deposit a sub-1-nm alumina on silver film-over-nanosphere (AgFON) substrates. The resulting overlayer maintains stabilizes the SERS activity of underlying while presenting surface chemistry overlayer, commonly polar adsorbent in chromatographic separations. relative affinity analytes alumina-modified AgFON substrates can be determined by...
The localized surface plasmon resonance (LSPR) of Al nanoparticles fabricated by nanosphere lithography (NSL) was examined UV−vis extinction spectroscopy and electrodynamics theory. triangular nanoparticle arrays can support LSP resonances that are tunable throughout the visible into UV portion spectrum. Scanning electron microscope atomic force studies point to presence a thin native Al2O3 layer on nanoparticles. oxide layer, especially tips nanotriangles, results in significant red shift...
Localized surface plasmon resonance (LSPR) is a key optical property of metallic nanoparticles. The peak position the LSPR for noble-metal nanoparticles highly dependent upon refractive index surrounding media and has therefore been used chemical biological sensing. In this work, we explore influence resonant adsorbates on bare Ag (lambda(max,bare)). Specifically, study effect rhodamine 6G (R6G) adsorption nanoparticle because its importance in single-molecule surface-enhanced Raman...
Biexciton properties strongly affect the usability of a light emitter in quantum photon sources and lasers but are difficult to measure for single fluorophores at room temperature due luminescence intermittency bleaching high excitation fluences usually required. Here, we observe biexciton (BX) exciton (X) ground photoluminescence cascade colloidal semiconductor nanocrystals (NCs) under weak g(2) correlation measurement show that normalized amplitude feature is equal ratio BX X fluorescence...
We report single-particle photoluminescence (PL) intermittency (blinking) with high on-time fractions in colloidal CdSe quantum dots (QD) conformal CdS shells of 1.4 nm thickness, equivalent to approximately 4 monolayers. All QDs observed displayed >60% the majority >80%. The fraction blinking is accompanied by fluorescence yields (QY) close unity (up 98% an absolute QY measurement) when dispersed organic solvents and a monoexponential ensemble decay lifetime. shell formed synthetic yield...
We demonstrate fast, highly efficient concurrent removal of toxic oxoanions Se(VI) (SeO42–) and Se(IV) (SeO32–/HSeO3–) heavy metal ions Hg2+, Cu2+, Cd2+ by the MoS42– intercalated Mg/Al layered double hydroxide (MgAl-MoS4-LDH, abbr. MoS4-LDH). Using MoS4-LDH as a sorbent, we observe that presence Hg2+ greatly promotes capture SeO42–, while three (Hg2+, Cd2+) enable remarkable improvement in SeO32–/HSeO3–. For pair Se(VI)+Hg2+, exhibits outstanding rates (>99.9%) for both Se(VI), compared to...
Fluorescent carbon nanoparticles were synthesized from a single precursor and applied for explosives detection.
Developing Type-I core/shell quantum dots is of great importance toward fabricating stable and sustainable photocatalysts. However, the application systems has been limited due to strongly confined photogenerated charges by energy barrier originating from wide-bandgap shell material. In this project, we found that through decoration Au satellite-type domains on surface CdS/ZnS dots, such an can be effectively overcome over 400-fold enhancement photocatalytic H2 evolution rate was achieved...
Abstract Solid‐state nanopore/nanochannel biosensors have rapidly advanced due to their high sensitivity, label‐free detection, and fast response. However, detecting biomarkers directly in complex biological environments, particularly whole blood, remains challenging because of nonspecific protein adsorption clogging. Here, a DNA aptamer functionalized nanochannel biosensor is developed with excellent antifouling properties, achieved by coating the surface agarose gel. This gel effectively...
The peak location of the localized surface plasmon resonance (LSPR) noble metal nanoparticles is highly dependent upon refractive index nanoparticles' surrounding environment. In this study, new phenomena are revealed by exploring influence interacting molecular resonances and nanoparticle resonances. LSPR shift line shape induced a resonant molecule vary with wavelength. most instances, oscillatory dependence on wavelength tracks real part index, as determined Kramers-Kronig transformation...
Semiconductor nanocrystals emit light intermittently; i.e., they ``blink,'' under steady illumination. The dark periods have been widely assumed to be due photoluminescence (PL) quenching by an Auger-like process involving a single additional charge present in the nanocrystal. Our results challenge this long-standing assumption. Close examination of exciton PL intensity time traces CdSe(CdZnS) core(shell) reveals that state quantum yield can 10 times less than biexciton yield. In addition,...
An electrochemical method is developed to quantitatively modify and spectroscopically monitor the size shape of Ag nanotriangles fabricated by nanosphere lithography (NSL) on an indium tin oxide (ITO) electrode surface. AFM SEM results demonstrate that preferential order oxidation for a nanotriangle is, surprisingly, bottom edges first, then triangular tips, out-of-plane height.
We demonstrate the highly selective and exceptionally efficient capture of toxic oxoanions As(III)/As(V) (HAsO32–/HAsO42–) Cr(VI) (CrO42–) by Mg/Al layered double hydroxide (Mg/Al-LDH) intercalated with MoS42– (MoS4-LDH). The MoS4-LDH exhibits very high removal rates (>99%) As(III), As(V), from complex aqueous solutions. In presence many competing nontoxic anions such as SO42–, NO3–, Cl–, remarkable selectivity for HAsO32–, HAsO42–, CrO42– is observed. Highly concentrated As(III) can be...
Cofacial J type nano aggregates, which are both fluorescent and triplet state photoactive, were formed in chloroform via multiple O → Zn2+ coordination bonds between molecules of ZnPc(α-OPh)4, i.e. tetra(α-phenoxy) zinc phthalocyanine. Non photoactive H on the other hand, observed DMF–water mixtures. The formation, structure bonding aggregates examined by TEM, electronic absorption fluorescence methods. Photophysical studies revealed that J-aggregates have narrowed emission bands with peak...