A5027713476- Gold and Silver Nanoparticles Synthesis and Applications
- Plasmonic and Surface Plasmon Research
- Nanocluster Synthesis and Applications
- Quantum Dots Synthesis And Properties
- Metamaterials and Metasurfaces Applications
- Advanced biosensing and bioanalysis techniques
- Photonic and Optical Devices
- Copper-based nanomaterials and applications
- Photonic Crystals and Applications
- Advanced Nanomaterials in Catalysis
- Nanoplatforms for cancer theranostics
- Advanced Photocatalysis Techniques
- 2D Materials and Applications
- Nanoparticle-Based Drug Delivery
- Laser-Ablation Synthesis of Nanoparticles
- Polymer Surface Interaction Studies
- Nanoparticles: synthesis and applications
- Nonlinear Optical Materials Studies
- Perovskite Materials and Applications
- Advanced Theoretical and Applied Studies in Material Sciences and Geometry
- Quantum optics and atomic interactions
- Random lasers and scattering media
- Advanced Electron Microscopy Techniques and Applications
- Drug Transport and Resistance Mechanisms
- Electrocatalysts for Energy Conversion
Chinese University of Hong Kong, Shenzhen
2022-2025
CIC biomaGUNE
2020-2023
Biomedical Research Networking Center in Bioengineering, Biomaterials and Nanomedicine
2021-2023
Chinese University of Hong Kong
2015-2022
Shatin Hospital
2017-2019
Sun Yat-sen University
2013
Gold nanobipyramids (NBPs) and nanorods (NRs) are two common types of elongated colloidal plasmonic metal nanocrystals, with their longitudinal plasmon wavelengths synthetically tunable over a wide spectral range. Au NBPs have sharper tips narrower shape size distributions than NRs. However, the number percentages been limited below ≈60%. Herein, method for producing approaching 100% resonance tuned from ≈700 to ≈1200 nm is reported. This relies on stepwise combination seed‐mediated growth,...
ConspectusGold nanobipyramids (Au NBPs) and gold nanorods NRs) are two types of elongated plasmonic nanoparticles with their longitudinal dipolar plasmon wavelengths synthetically tunable from the visible region to near-infrared region. Both have highly polarization-dependent absorption scattering cross sections because anisotropic geometries. In terms differences, each Au NBP has five equally angularly separated twinning planes that aligned parallel length direction, while most common NRs...
A robust and reproducible methodology to prepare stable inorganic nanoparticles with chiral morphology may hold the key practical utilization of these materials. An optimized growth method fourfold twisted gold nanorods is described herein, where amino acid cysteine used as a dissymmetry inducer. Four tilted ridges are found develop on surface single-crystal upon repeated reduction HAuCl
Utilizing electromagnetic hotspots within plasmonic nanogaps is a promising approach to create ultrasensitive surface-enhanced Raman scattering (SERS) substrates. However, it difficult for many molecules get positioned in such nanogaps. Metal-organic frameworks (MOFs) are commonly used absorb and concentrate diverse molecules. Herein, we combine these two strategies by introducing MOFs into plasmon-coupled nanogaps, which has so far remained experimentally challenging. Ultrasensitive SERS...
We report on a method for the preparation of uniform and length-variable Ag nanorods through anisotropic overgrowth high-purity Au nanobipyramids. The rod diameters can be roughly tailored from ∼20 nm to ∼50 by judicious selection differently sized lengths tuned ∼150 ∼550 varying precursor amount during process and/or shortening mild oxidation. controllable aspect ratios, high purity, dimensional uniformity these enable observation Fabry–Pérot-like multipolar plasmon resonance modes in...
Silver nanostructures with narrow plasmon linewidths and good chemical stability are strongly desired for plasmonic applications. Herein, a facile method is discussed the preparation of Ag improved through overgrowth on monodispersed Au nanobipyramids. Structural evolution from bipyramid rice to rod observed, indicating that atoms preferentially deposited side surfaces The resultant (Au nanobipyramid)@Ag possess high size shape uniformities, much narrower than other nanostructures. spectral...
The synthesis of anisotropic metal nanostructures is strongly desired for exploring plasmon‐enabled applications. Herein, the preparation Au/SiO 2 and /Pd realized through selective silica coating on Au nanobipyramids. For at ends nanobipyramids, amount coated overall shape exhibit a bell‐shaped dependence cationic surfactant concentration. both end side size component can be varied by changing precursor amount. Silica also selectively deposited corners or facets nanocubes, suggesting...
The synthesis of metal nanostructures with plasmon wavelengths beyond ∼1000 nm is strongly desired, especially for those small sizes. Herein we report on a AgPd-tipping process Au nanobipyramids the resultant red shifts reaching up to ∼900 nm. large are ascribed deposition at tips nanobipyramids, which verified by electrodynamic simulations. method has been successfully applied and nanorods different longitudinal dipolar wavelengths, demonstrating that these nanocrystals can be extended...
Plasmonic nanochains, derived from the one-dimensional assembly of individual plasmonic nanoparticles (NPs), remain infrequently explored in biological investigations due to their limited colloidal stability, ineffective cellular uptake, and susceptibility intracellular disassembly. We report synthesis polydopamine (PDA)-coated "nanoworms" (NWs) by sonicating citrate-capped gold (Cit-Au) NPs a concentrated dopamine (DA) solution under alkaline conditions. DA mediates Cit-Au into Au NWs...
Chiral plasmonics is a rapidly developing field where breakthroughs and unsolved problems coexist. We have recently reported binary surfactant-assisted seeded growth of chiral gold nanorods (Au NRs) with high chiroptical activity. Such seeded-growth process involves the use cosurfactant that induces micellar helicity, in turn driving transition from achiral to Au NRs, both morphological optical points view. report herein detailed study on transitions, which reveals intermediate states were...
Abstract 2D or pseudo‐2D plasmonic Au nanocrystals, such as circular nanodisks, possess unique properties. Circular nanodisks not only two large surfaces with symmetry but also exhibit the wide tunability for their plasmon resonance. However, lack of effective synthetic methods producing size‐tunable and monodispersed hinders further studies on properties applications. Herein, synthesis uniformly sized synthetically tunable diameters thicknesses is reported. By performing mild anisotropic...
Abstract Gold nanorings are attractive as plasmonic metal nanocrystals because they have a hollow inner cavity. Their enhanced electric field inside the ring cavity is accessible, which highly desirable for assembling with other optical components and studying their plasmon‐coupling behaviors. However, lack of robust methods synthesizing size‐controllable uniform Au severely impedes study properties plasmon‐driven applications. Herein, an improved wet‐chemistry method reported synthesis...
Elongated plasmonic nanoparticles have been extensively explored over the past two decades. However, in comparison with dipolar plasmon mode that has attracted most interest, much less attention paid to multipolar modes because they are usually thought be "dark modes", which unable interact far-field light efficiently. Herein, we report on an intriguing scattering phenomenon, colour routing, based longitudinal supported by high-aspect-ratio single Ag nanorods. Taking advantage of distinct...
Silver is arguably the best plasmonic material in terms of optical performance. However, wide application Ag and Ag-containing nanoparticles usually hindered by two major drawbacks, namely, chemical degradation cytotoxicity. We report herein a synthetic method for highly monodisperse polymer-coated nanorods, which are thereby protected against external stimuli (oxidation, light, heat) noncytotoxic to various cell lines. The monodispersity nanorods endows them with narrow plasmon bands,...
Several synthesis techniques have emerged for the preparation of chiral metal nanoparticles (NPs) with intrinsic geometrical structures and high optical activity. Chiral plasmonic NPs typically display intricate morphologies terminated by high-energy facets, resulting in limited long-term thermal stability, which is critical development their applications, e.g., biomedical field. gold nanorods (Au NRs) suffer from loss structural stability (reshaping), turn results We carried out a...
Abstract Surface‐enhanced infrared absorption (SEIRA) spectroscopy, the enhancement of molecular vibrational signals using resonant metal nanostructures, has recently attracted much attention owing to its potential use in detection chemistry, biology, and medicine. This study reports on growth high‐aspect‐ratio nanocrystals their application for SEIRA. Highly uniform Ag nanorods are synthesized through Au nanobipyramid‐directed overgrowth, nanotubes further prepared galvanic replacement...
Abstract Plasmonic sensors that make use of localized surface plasmon resonance provide an excellent platform for hydrogen sensing. In this work, large plasmonic red shifts are obtained on (Au nanobipyramid core)@(Pd shell) bimetallic nanostructures Au nanobipyramid@Pd with different shell thicknesses synthesized by varying the Pd precursor amount. The thicker shells found to exhibit larger responses hydrogen. maximal shift reaches 97 nm at 4 vol% concentration. morphology is further...
Polydopamine-based concentric nanoshells with programmable nanogap thickness, elemental composition, and geometrical configuration display multiple Fano resonances local-field “hot spots”.