A5077155104- Gold and Silver Nanoparticles Synthesis and Applications
- Plasmonic and Surface Plasmon Research
- Quantum Dots Synthesis And Properties
- Advanced biosensing and bioanalysis techniques
- Biosensors and Analytical Detection
- Force Microscopy Techniques and Applications
- Graphene research and applications
- Photonic Crystals and Applications
- Acoustic Wave Resonator Technologies
- Near-Field Optical Microscopy
- Nanowire Synthesis and Applications
- 2D Materials and Applications
- Spectroscopy Techniques in Biomedical and Chemical Research
- Thermography and Photoacoustic Techniques
- Adhesion, Friction, and Surface Interactions
- Autonomous Vehicle Technology and Safety
- Advanced Nanomaterials in Catalysis
- Image Processing Techniques and Applications
- Advanced Biosensing Techniques and Applications
- Diamond and Carbon-based Materials Research
- Multiferroics and related materials
- Integrated Circuits and Semiconductor Failure Analysis
- SARS-CoV-2 detection and testing
- Mechanical and Optical Resonators
- Electrophoretic Deposition in Materials Science
Korea Photonics Technology Institute
2022-2024
Incheon National University
2020-2022
Yeungnam University
2021
Seoul National University
2015-2019
Here we report a synthetic pathway toward Au truncated octahedral dual-rim nanoframes wherein two functional facets are formed including (1) eight hot nanogaps by hexagonal embracing core circular nanorings for near-field focusing and (2) six flat squares that facilitate the formation of well-ordered arrays through self-assembly. The existence intra-nanogaps in single entity enables strong electromagnetic focusing, allowing single-particle surface-enhanced Raman spectroscopy. Then, built...
Three-dimensional (3D) nanoframe structures are very appealing because their inner voids and ridges interact efficiently with light analytes, allowing for effective optical-based sensing. However, the realization of complex architecture high yield is challenging systematic design such a complicated nanostructure lacks an appropriate synthesis protocol. Here, we show method 3D nanoframes wherein two-dimensional (2D) dual-rim nanostructures engraved on each facet octahedral nanoframes. The...
This study represents the synthesis of a novel class nanoparticles denoted as annular Au nanotrenches (AANTs). AANTs are engineered to possess embedded, narrow circular nanogaps with dimensions approximately 1 nm, facilitating near-field focusing for detection severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) via surface-enhanced Raman scattering (SERS)-based immunoassay. Notably, exhibited an exceedingly low limit (LOD) fg/mL SARS-CoV-2 spike glycoproteins, surpassing...
A synthesis method for plasmonic double-walled nanoframes was developed, where single-walled truncated octahedral with (111) open facets and (100) solid flat planes are nested in a core-shell manner. By applying multiple chemical toolkits to Au cuboctahedrons as starting template, controllable face-to-face nanogaps were successfully synthesized high homogeneity size shape. Importantly, when the gap distance between inner outer walled frames became closer, augmentation of electromagnetic...
We report the synthesis of all-frame-faceted octahedral nanoframes containing eight Y-shaped hot zones in a single entity where electromagnetic near-field focusing can be maximized. To realize such state-of-the-art complex nanoframes, series multiple stepwise bottom-up processes were executed by exploiting Au nanoparticles as initial template. By rationally controlling chemical reactivity different surface facets (i.e., vertexes, edges, and terraces), went through controlled shape...
The development of plasmonic nanostructures with intricate nanoframe morphologies has attracted considerable interest for improving catalytic and optical properties. However, arranging multiple nanoframes in one nanostructure especially, a solution phase remains great challenge. Herein, we show complex nanoparticles by embedding various shapes three-dimensional polyhedral within single entity through rationally designed synthetic pathways. This strategy is based on the selective deposition...
Abstract The emergence of infectious diseases worldwide necessitates rapid and precise diagnostics. Using gold nanoshells in the PCR mix, we harnessed their unique photothermal properties near-infrared regime to attain efficient heating, reaching ideal cycle temperature profile. Our method expedited DNA amplification while retaining its detection sensitivity. Combining quantitative with real-time fluorometry non-invasive measurement, could amplify target within just 25 min, a minimum...
Abstract Advances in photolithographic processes have allowed semiconductor industries to manufacture smaller and denser chips. As the feature size of integrated circuits becomes smaller, there has been a growing need for photomask embedded with ever narrower patterns. However, it is challenging electron beam lithography obtain <10 nm linewidths wafer scale uniformity necessary speed. Here, we introduce photolithography-based, cost-effective mask fabrication method based on atomic layer...
The understanding and engineering of the plasmon-exciton coupling are necessary to control innovative optoelectronic device platform. In this study, we investigated intertwined mechanism each couplings in monolayer molybdenum disulfide (MoS2) plasmonic hybrid structure. results absorption, simulation, electrostatics, emission spectra show that interaction between photoexcited carrier exciton modes successfully coupled by energy transfer recombination processes. Especially, neutral exciton,...
Abstract We investigate conducting characteristics of biochar derived from the pyrolysis a paper at terahertz frequencies. Paper is annealed under temperatures ranging 600 to 1000 °C modify structural and electrical properties. experimentally observe that conductivity increases above 10 2 S/m as annealing temperature up 800 °C. From characterization using energy-dispersive X-ray spectroscopy, Fourier-transform infrared Raman diffraction, photoelectron we confirm more graphitic biochars are...
Plasmon-mediated polymerization has been intensively studied for various applications including nanolithography, near-field mapping, and selective functionalization. However, these studies have limited from the near-infrared to ultraviolet regime. Here, we report a resist using intense terahertz pulses nanoantennas. The is polymerized near nanoantennas, where giant field enhancement occurs. We experimentally show that physical origin of cross-linking electron emission nanoantenna, rather...
Scanning thermal microscopy (SThM) enables to obtain characteristic information such as temperature and conductivity from the signals obtained by scanning a thermometer probe over sample surface. Particularly, precise control of makes it possible study near-field radiative heat transfer measuring energy, which implies that when light is used local source, photothermal energy can be detected optical approaching in region. In this study, SThM applied generate sub-wavelength image plasmonic...
Abstract Fundamental understanding of domain dynamics in ferroic materials has been a longstanding issue because its relevance to many systems and the design nanoscale domain-wall devices. Despite theoretical experimental studies, full still remains incomplete, partly due complex interactions between domain-walls disorder. We report domain-shape-preserving deterministic motion, which directly confirms microscopic return point memory, by observing breathing motion ferroelectric BiFeO 3 thin...
We present terahertz optical properties of GdBa2Cu3O7-x (GdBCO) superconducting thin films. GdBCO films with a thickness about 105 nm were grown on LaAlO3 (LAO) single crystal substrate using conventional pulsed laser deposition (PLD) technique. Using an Ar ion milling system, the film was reduced to 58 nm, and its surface also smoothened. Terahertz (THz) transmission spectra through two different are measured over range between 0.2 1.5 THz time domain spectroscopy. Interestingly, thinner...
Abstract Herein, we report unprecedented four-dimensional complex nanoparticles by embedding various kinds of three-dimensional polyhedral nanoframes within a single entity. This synthetic strategy is based on the selective deposition metal atoms high surface energy facets and subsequent growth into solid platonic nanoparticles, followed etching inner metals, leaving nanoframes. Our routes are rationally designed executable on-demand with structural controllability. Diverse Au nanostructures...