A5023468083- Luminescence Properties of Advanced Materials
- Nanoplatforms for cancer theranostics
- Photoacoustic and Ultrasonic Imaging
- Gold and Silver Nanoparticles Synthesis and Applications
- Quantum Dots Synthesis And Properties
- Lanthanide and Transition Metal Complexes
- Solid State Laser Technologies
- Luminescence and Fluorescent Materials
- Photodynamic Therapy Research Studies
- Chalcogenide Semiconductor Thin Films
- Nanomaterials and Printing Technologies
- Optical properties and cooling technologies in crystalline materials
- Perovskite Materials and Applications
- Nanoparticle-Based Drug Delivery
- Carbon Dioxide Capture Technologies
- Photonic and Optical Devices
- Optical Imaging and Spectroscopy Techniques
- Advanced Sensor and Energy Harvesting Materials
- Photonic Crystals and Applications
- Membrane Separation and Gas Transport
- Additive Manufacturing and 3D Printing Technologies
- Crystallization and Solubility Studies
- Semiconductor Lasers and Optical Devices
- Inorganic Fluorides and Related Compounds
- Biosensors and Analytical Detection
Singapore University of Technology and Design
2015-2024
Rutgers, The State University of New Jersey
2009-2015
Rutgers Sexual and Reproductive Health and Rights
2014
University of Tartu
2010
National University of Singapore
2002-2009
Massachusetts Institute of Technology
2007-2008
Celanese (United States)
1977
While metal-organic frameworks (MOFs) are promising gas adsorbents, their tortuous microporous structures cause additional resistance for diffusion, thus hindering the accessibility of interior active sites. Here, we present a practical strategy to incorporate missing cluster defects into representative low-coordinated MOFs structure, Mg-MOF-74, while maintaining stability defect-rich structure. In this proposed method, graphene oxide (GO) is employed as modulator, and crystallization time...
Monodisperse β-NaYF4:Yb,Er nanocrystals with mean sizes of 11, 40, and 110 nm were synthesized by a thermal decomposition solvothermal process to better understand the relationship between particle size optical properties. A systematic study luminescence intensity versus revealed that both visible upconversion infrared downconversion emission intensities decrease decreasing nanocrystal size. The intrinsic quantum efficiency 4I13/2 → 4I15/2 transition was studied in great detail since this...
Infrared-to-visible rare earth doped upconversion phosphors that convert multiple photons of lower energy to higher offer a wide range technological applications. The brightness (i.e., emission intensities) and efficiency are important performance characteristics determine which applications appropriate. Optical can be used as measure the these phosphors. In this work, hexagonal-phase NaYF4:Yb-Er was synthesized using hydrothermal method in presence surfactants like trioctylphosphine,...
Schematic of our first-in-class system based on rare earth nanoprobes for real-time and multi-spectral<italic>in vivo</italic>optical SWIR imaging tumors, organs, vasculature.
The widespread implementation and rapid development of autonomous systems pose stringent performance requirements on emerging sensory systems. In addition to the basic sensing requirements, leading are required process data extract featured information from highly redundant in real time. With added edge‐computational capabilities, shuttling is avoided, significant reduction computational burden bandwidth pressure cloud. Among different computing architectures, neuromorphic system stands out...
Micropores significantly impact the adsorption properties of porous materials, but their effective utilization often encounters diffusion limitations. Introducing hierarchical pore structures offers a promising solution. However, sustainable fabrication remains challenging. Additionally, previous methods typically involve use nitrogen-containing compounds, complicating exploration relationship between structure and CO2 capture due to CO2's strong affinity for N-containing groups. Here, we...
Realizing the promise of precision medicine in cancer therapy depends on identifying and tracking cancerous growths to maximize treatment options improve patient outcomes. This goal early detection remains unfulfilled by current clinical imaging techniques that fail detect lesions due their small size suborgan localization. With proper probes, optical can overcome this molecular phenotype tumors at both macroscopic microscopic scales. In study, first use nanophotonic short wave infrared...
We present an overview on the design of rare earth doped nanomaterials with controlled size, morphology, heterostructure and surface chemistry to create brightly emitting particles monolithic nanostructured optically active polymeric composites for infrared-based applications.
Nd 3 + -doped YF3 (YF3:Nd) nanoparticles with a size of ∼20 nm were synthesized by solvothermal decomposition yttrium and neodymium trifluoroacetate precursors in oleylamine. Using the 4f-energy matrix diagonalization procedure various interaction parameters: Slater–Condon (F2, F4, F6), spin-orbit (ξ), two body (α, β, γ), Judd parameters (T2, T3, T4, T6, T7, T8), spin-other-orbit (M0, M2, M4) electrostatically correlated (P2, P4, P6), crystal-field (Bqk) evaluated. The potential YF3:Nd as...
Directed self-assembly of nanoparticles (DSA-n) holds great potential for device miniaturization in providing patterning resolution and throughput that exceed existing lithographic capabilities. Although excel at assembling into regular close-packed arrays, actual devices on the other hand are often laid out sparse complex configurations. Hence, deterministic positioning single or few particles specific positions with low defect density is imperative. Here, we report an approach DSA-n...
Infrared-emitting rare-earth (ytterbium and erbium) doped nanoparticles (REDNPs) have recently emerged as an excellent probe for both deep tissue luminescence photoacoustic (PA) imaging with high resolutions contrast. Here we report on the first study of size surface effects infrared PA dual modal REDNPs. We show that signal amplitude generated by REDNPs is increased increasing coating inorganic shell (undoped NaYF4 or silica). also discovered choice material critical undoped was able to...
Culturing CHO (Chinese-hamster ovary) cells at low temperature leads to growth arrest in the G0/G1 phase of cell cycle and, many cases, causes an increase specific productivity recombinant protein. Controlled proliferation is often used productivity, and thus there speculation that enhanced due G0/G1-phase arrest. However, we show positive effect on protein production elevated mRNA levels not a line can still exhibit growth-associated temperatures. Using producing human IFN-gamma...
Bright infrared-emitting nanocomposites of unmodified CeF3:Yb−Er with polymethyl-methacrylate (PMMA) and polystyrene (PS), which offer a vast range potential applications, include optical amplifiers, waveguides, laser materials, implantable medical devices, were developed. For the application these nanocomposites, it is critical to obtain highly transparent composites minimize absorption scattering losses. Preparation typically requires powder processing approaches that sophisticated...
Ln(SePh)3 (Ln = Ce, Pr, Nd) reacts with elemental Se in the presence of Na ions to give (py)16Ln17NaSe18(SePh)16, a spherical cluster 1 nm diameter. All three rare-earth metals form isostructural products. The molecular structure contains central Ln ion surrounded by eight five-coordinate Se2− that are then group 16 define surface, additional μ3 and μ5 Se2−, μ4 SePh−, pyridine donors saturating vacant coordination sites surface Ln, coordinating selenolates, selenido, ligands. NIR emission...
Multi-modal imaging is an emerging area that integrates multiple modalities to simultaneously capture visual information over many spatial scales. Complementary contrast agents need be co-developed in order achieve high resolution and contrast. In this work, we demonstrated rare-earth doped particles (REDPs) can employed as dual-modal for both luminescence photoacoustic (PA) intrinsic contrast, temporal resolution, reaching deeper depth. REDPs synthesized with different surfactants (citric...
The tunability, brightness, and energy efficiencies of infrared-emitting rare earth doped nanomaterials are important performance parameters for biomedical imaging applications. In this work, hexagonal phase NaYF4:Yb3+, Ln3+ (Ho3+, Tm3+ Pr3+) was synthesized optimized using a facile hydrothermal method in the presence poly(vinyl-pyrrolidone). Distinct infrared emission peaks were measured at 1185, 1310 1475 nm upon excitation 980 nm. optical optimal concentrations to quantify brightness...
In this work, a host which interacts and enhanced energy transfer to the luminescent center such that it facilitates infrared emission while avoiding undesired emissions was found. An intense at approximately 1530 nm with no other visible observed in Er- Yb-Er- doped CeF3 nanoparticles upon excitation 975 nm. The average measured luminescence lifetimes of for heat-treated CeF3:Er CeF3:Yb,Er 4.5-6.5 ms, internal quantum efficiencies up 52-75%. These offer vast range potential applications,...
Size-controlled hexagonal- and cubic-phase NaYF4:Yb,Er nanocrystals with bright fluorescent emission were successfully synthesized via a solvothermal approach at relatively low temperature (< 300 degrees C). A mixture of ethanol ethylene glycol or pure was used as solvent, whereby changing the concentration. It is found that, besides reaction time, reactant concentration an important factor to control crystal phase. High concentration, high temperature, long durations are favorable formation...
Significant IR emission enhancement in both NaYF<sub>4</sub> microparticles and nanoparticles was obtained using the tri-dopant scheme of Ce, Yb Er.
We report on the directed self-assembly of sub-10 nm gold nanoparticles confined within a template comprising channels gradually varying widths. When colloidal lattice parameter is mismatched with channel width, rearrange and break their natural close-packed ordering, transiting through range structural configurations according to constraints imposed by channel. While much work has been done in assembling ordered configurations, studies transition regime between states have limited...
By comparing the magnitude of forces, a directed self-assembly mechanism has been suggested previously in which immersion capillary is only driving force responsible for packing and ordering nanoparticles, occur after meniscus recedes. However, this insufficient to explain vacancies formed by at low particle concentrations. Utilizing experiments, Monte Carlo Brownian dynamics simulations, we developed theoretical model based on new proposed mechanism. In our mechanism, competing forces...