A5006483461- Gold and Silver Nanoparticles Synthesis and Applications
- Pickering emulsions and particle stabilization
- Advanced Photocatalysis Techniques
- Solar-Powered Water Purification Methods
- Biosensors and Analytical Detection
- Advanced Sensor and Energy Harvesting Materials
- Ammonia Synthesis and Nitrogen Reduction
- Electrocatalysts for Energy Conversion
- Advancements in Battery Materials
- Advanced Battery Materials and Technologies
- Micro and Nano Robotics
- Advanced biosensing and bioanalysis techniques
- Metal-Organic Frameworks: Synthesis and Applications
- Innovative Microfluidic and Catalytic Techniques Innovation
- Nanocluster Synthesis and Applications
- Nanomaterials for catalytic reactions
- Surfactants and Colloidal Systems
- Perovskite Materials and Applications
- Catalytic Processes in Materials Science
- Electrohydrodynamics and Fluid Dynamics
- Gas Sensing Nanomaterials and Sensors
- Covalent Organic Framework Applications
- Thermal Radiation and Cooling Technologies
- Nanoporous metals and alloys
- Dielectric materials and actuators
Agency for Science, Technology and Research
2013-2025
National University of Singapore
2023-2025
Nanyang Technological University
2016-2025
Institute of Materials Research and Engineering
2014-2025
Stanford University
2019-2024
The discovery of the enhancement Raman scattering by molecules adsorbed on nanostructured metal surfaces is a landmark in history spectroscopic and analytical techniques. Significant experimental theoretical effort has been directed toward understanding surface-enhanced (SERS) effect demonstrating its potential various types ultrasensitive sensing applications wide variety fields. In 45 years since discovery, SERS blossomed into rich area research technology, but additional efforts are still...
Electrochemical nitrogen-to-ammonia fixation is emerging as a sustainable strategy to tackle the hydrogen- and energy-intensive operations by Haber-Bosch process for ammonia production. However, current electrochemical nitrogen reduction reaction (NRR) progress impeded overwhelming competition from hydrogen evolution (HER) across all traditional NRR catalysts requirement elevated temperature/pressure. We achieve both excellent selectivity (~90%) significant boost Faradic efficiency 10...
The electrochemical nitrogen reduction reaction (NRR) offers a sustainable solution towards ammonia production but suffers poor performance owing to preferential catalyst-H formation and the consequential hydrogen evolution (HER). Now, Pt/Au electrocatalyst d-band structure is electronically modified using zeolitic imidazole framework (ZIF) achieve Faradaic efficiency (FE) of >44 % with high yield rate >161 μg mgcat-1 h-1 under ambient conditions. strategy lowers position weaken H adsorption...
Abstract Photothermal materials are crucial for diverse heating applications, but it remains challenging to achieve high energy conversion efficiency due the difficulty concurrently improve light absorbance and suppress heat loss. Herein, a zeolitic imidazolate framework‐isolated graphene (G@ZIF) nanohybrid is demonstrated that utilizes ultrathin, heat‐insulating ZIF layers, G@ZIF interfacial nanocavity synergistically intensify localization. Under artificial sunlight illumination (≈1 kW m...
Population-wide surveillance of COVID-19 requires tests to be quick and accurate minimize community transmissions. The detection breath volatile organic compounds presents a promising option for but is currently limited by bulky instrumentation inflexible analysis protocol. Here, we design hand-held surface-enhanced Raman scattering-based breathalyzer identify infected individuals in under 5 min, achieving >95% sensitivity specificity across 501 participants regardless their displayed...
We present the next generation covert plasmonic security labels based on Ag nanowire structures and their polarization dependent surface-enhanced Raman scattering (SERS) imaging. The consist of nanowires fabricated by two-photon lithography thermal evaporation, where molecular probes choice are deposited. Simulation experimental results show that SERS signals from embedded molecules depend significantly incident field. information cannot be revealed directly physical features, but can only...
Composite nanomaterials are attractive for a diverse range of applications in catalysis, plasmonics, sensing, imaging, and biology. In such composite nanomaterials, it is desired, yet still challenging to create controlled alignment between components with lattices disparate scales. To address this challenge, we report new concept colloidal synthesis, which self-assembled molecular layers control the materials during synthesis. illustrate concept, cetyltrimethylammonium bromide (CTAB)...
Abstract A major challenge in nanoparticle self-assembly is programming the large-area organization of a single type anisotropic into distinct superlattices with tunable packing efficiencies. Here we utilize nanoscale surface chemistry to direct silver octahedra three two-dimensional plasmonic at liquid/liquid interface. Systematically tuning wettability leads continuous superlattice structural evolution, from close-packed progressively open structures. Notably, standing on vertices arranged...
A plasmonic nose is designed using a ZIF-encapsulated Ag nanocube array to concentrate molecules and electromagnetic field at the 3D nanometer scale.
Stand-off Raman spectroscopy combines the advantages of both and remote detection to retrieve molecular vibrational fingerprints chemicals at inaccessible sites. However, it is currently restricted pure solids liquids not widely applicable for dispersed molecules in air. Herein, we realize real-time stand-off SERS multiplex atmospheric airborne species by integrating a long-range optic system with 3D analyte-sorbing metal–organic framework (MOF)-integrated platform. Formed via self-assembly...
An analytical platform suitable for trace detection using a small volume of analyte is pertinent to the field toxin and criminology. Plasmonic nanostructures provide surface-enhanced Raman scattering (SERS) that can potentially achieve toxins and/or molecules detection. However, highly diluted, samples remains challenge. Here, we fabricate superhydrophobic SERS by assembling Ag nanocubes support strong surface plasmon chemical functionalization with sample just 1 μL. Our strategy integrates...
Successful translation of laboratory-based surface-enhanced Raman scattering (SERS) platforms to clinical applications requires multiplex and ultratrace detection small biomarker molecules from a complex biofluid. However, these generally exhibit low cross sections do not possess specific affinity plasmonic nanoparticle surfaces, significantly increasing the challenge detecting them at concentrations. Herein, we demonstrate "confine-and-capture" approach for two families urine metabolites...
Colloidosomes are robust microcapsules attractive for molecular sensing because of their characteristic micron size, large specific surface area, and dual-phase stability. However, current colloidosome sensors limited to qualitative fluorogenic receptor-based detection, which restrict applicability a narrow range molecules. Here, we introduce plasmonic constructed from Ag nanocubes as an emulsion-based 3D SERS platform. The colloidosomes exhibit excellent mechanical robustness, flexible size...
Abstract Inspired by aphids, liquid marbles have been studied extensively and found application as isolated microreactors, micropumps, in sensing. However, current liquid‐marble‐based sensing methodologies are limited to qualitative colorimetry‐based detection. Herein we describe the fabrication of a plasmonic marble substrate‐less analytical platform which, when coupled with ultrasensitive SERS, enables simultaneous multiplex quantification identification ultratrace analytes across separate...
We demonstrate the fabrication of graphene liquid marbles as photothermal miniature reactors with precise temperature control for reaction kinetics modulation. Graphene show rapid and highly reproducible behavior while maintaining their excellent mechanical robustness. By tuning applied laser power, swift regulation marble's surface between 21-135 °C its encapsulated water 21-74 are demonstrated. The modulates in our marble, achieving a 12-fold superior rate constant methylene blue...
A dual-functional device to integrate solar-driven water evaporation and evaporation-induced power generation is demonstrated concurrently produce clean green electricity, with the aim address inevitable energy crises.
Solvents are essential for chemical synthesis and material preparation; however, traditional solvents face challenges in meeting safety sustainability standards.