A5101849523- Gold and Silver Nanoparticles Synthesis and Applications
- Photonic and Optical Devices
- Photonic Crystals and Applications
- Biosensors and Analytical Detection
- Advanced Nanomaterials in Catalysis
- Advanced biosensing and bioanalysis techniques
- Quantum Dots Synthesis And Properties
- Analytical Chemistry and Sensors
- Plasmonic and Surface Plasmon Research
- Silicon Nanostructures and Photoluminescence
- Nanocluster Synthesis and Applications
- Medical Imaging and Analysis
- Natural Compound Pharmacology Studies
- Nanowire Synthesis and Applications
- Natural product bioactivities and synthesis
- Ginseng Biological Effects and Applications
- Gas Sensing Nanomaterials and Sensors
- Phytochemical compounds biological activities
- Digital Imaging for Blood Diseases
- Insect and Pesticide Research
- Traditional and Medicinal Uses of Annonaceae
- Retinal and Optic Conditions
- Photonic Crystal and Fiber Optics
- Carbon and Quantum Dots Applications
- Imbalanced Data Classification Techniques
Vietnam Academy of Science and Technology
2013-2024
Vietnam National University Ho Chi Minh City
2022-2023
Institute of Materials Science
2021
Instituto de Ciencia de Materiales de Sevilla
2014
Context: A methanol extract of Cyperus rotundus L. (Cyperaceae) rhizomes showed inhibitory activity against α-glucosidase and α-amylase, two enzymes involve in carbohydrate digestion.Objective: Identification compounds from C. responsible for the inhibition α-amylase.Materials methods: Compounds were identified by a phytochemical investigation using combined chromatographic spectroscopic methods. α-amylase activities evaluated vitro enzyme assays.Results: new...
Permethrin, 3-Phenoxybenzyl (1 RS)-cis,trans-3-(2,2-dichlorovinyl)- 2,2-dimethylcyclopropanecarboxylate, has a wide range of applications like insecticide, insect repellent and prevents mosquito-borne diseases, such as dengue fever malaria in tropical areas. In this work, we develop prominent monitoring method for the detection permethrin pesticide using surface-enhanced Raman scattering (SERS) optical fibre substrates. The novel SERS-active substrates were grown deposited silver (Ag)...
Here, we present a new and facile method to grow graphene (Gr) shell layer on the surface of 3D urchin-like TiO2 core (TiO2@Gr) silicon (Si/SiO2) substrate as a...
One new β-carboline alkaloid 7-methoxy-(9H-β-carbolin-1-il)-(E)-1-propenoic acid (1) together with 9-methoxycanthin-6-one (2) and 9-hydroxycanthin-6-one (3) were isolated from the hairy-root cultures of Eurycoma longifolia. The effects these compounds on lipopolysaccharide (LPS)-induced nitric oxide (NO) production in RAW264.7 cells investigated. Compound 1 strongly inhibited NO while 2 3 having weak or inactive effect. Consistently, compound decreased expression cyclooxygenase-2 inducible synthase.
A megastigmane sulphoglycoside together with three phenolic compounds were isolated from the water-soluble fraction of pericarps Garcinia mangostana. The structure new compound was determined as 4-O-sulpho-β-d-glucopyranosyl abscisate (1) by spectroscopic data. Proanthocyanidin A2 (2) showed potent α-glucosidase inhibitory and DPPH scavenging activities IC50 values 3.46 11.6 μM, respectively.
Raman spectroscopy offers a rapid and nondestructive method for qualitatively quantitatively analyzing the molecular structure of substances. Herein, facile cost‐effective approach preparation three‐dimensional (3D) surface‐enhanced scattering (SERS) substrates is proposed, in which pyramid structures are fabricated using silicon anisotropic wet etching silver dendrites decorated on these (PSi) by immersing them mixture hydrofluoric acid nitrate several minutes. The 3D SERS substrates, based...
A vast majority of the organic solvents used in industry and laboratories are volatile, hazardous toxic compounds, they considered as a potent problem for human health cause environmental pollution. Although analytical laboratory methods can determine extremely low solvent concentration, sensing method with cost high sensitivity remains conundrum. This paper presents compares three (volatile compound (VOC), liquid drop saturated vapour pressure) determination environment by using photonic...
Slotted photonic crystal (SPC) cavities provide strong evanescent fields, high quality factors, and small mode volumes. Hence, SPC have been identified as promising candidates for the implementation of high-performance sensors development hybrid devices combining silicon with other active materials. Nevertheless, most state-of-the-art demonstrations rely on electron beam lithography operate in telecommunications band near 1550 nm wavelength. Here, we report experimental demonstration...
A porous silicon microcavity (PSMC) sensor has been made for vapors of solvent solutions, and a method developed in order to obtain simultaneous determination two volatile substances with different concentrations. In our work, the temperature solution velocity air stream flowing through have used control response ethanol acetone solutions. We study dependence cavity-resonant wavelength shift on concentration, airflow temperature. The depends linearly concentration increases airflow....
Lending activities are an important part of the credit financial institutions and banks. This is area that brings great potential for development as well a sustainable source profit However, lending to customers also high risks. Therefore, predicting ability repay on time understanding factors affecting repayment extremely necessary, help banks enhance their pay debts. customers' identify debts time, contributing minimizing bad enhancing risk management. In this study, Machine Learning...
The chemical composition of Gynostemma burmanicum King ex Chakrav. was investigated for the first time in this study. Nine dammarane glycosides (1‒9) were isolated from EtOH extract aerial parts G. burmanicum. Their structures elucidated by 1D and 2D NMR spectroscopic interpretation as well studies. new compounds 3β,20S-dihydroxydammar-24-ene-3-O-β-D-glucopyranosyl-20-O-[β-D-xylopyranosyl-(1→6)-β-D-glucopyranoside] (1),...
In this work, we present a novel fabrication method for making the surface-enhanced Raman scattering (SERS) probe based on silver (Ag) nano-dendrites which are grown and deposited end of multi-mode fibre core by simple low-cost laser-induced technique. The morphology Ag-nanoparticles (AgNPs) could be controlled experimental conditions such as laser power, illumination time, concentration reaction solution. chemical composition SERS probes characterized high-resolution scanning electron...
Detecting abnormalities on spinal X-ray images plays a crucial role in early diagnosis and treatment of disorders. In this paper, we propose comparative study three models namely Faster R-CNN, RetinaNet, FCOS for abnormality detection images. Experimental results were measured by the mean average precision at threshold 0.5 (mAP@0.5). We investigate impact varying input image sizes number updated weight layers ResNet FPN backbone R-CNN model. Among models, model with ResNet152 achieves...
In this work, porous silicon photonic crystals (PSi PhCs) covered by silver nanoparticles (AgNPs) were prepared as surface-enhanced Raman scattering (SERS) substrate to detect methylene blue (MB) at low concentrations. The limit of MB detection in water the SERS is evaluated be 10\(^{-10}\) mol/L. signal intensities 446 cm\(^{-1}\) and 1623 peaks spectra are fit exponential functions concentrations ranging from 10\(^{-4}\) These results show that AgNPs on PSi PhCs substrates could applied...
We report nanophotonic silicon-based devices for hybrid integration: 1D photonic crystal (PhC) on optical fiber, i. e. fiber Bragg grating (FBG) sensing probe integrated in laser structure chemical sensors and slotted planar 2D PhC cavity combined with carbon nanotube (CNT) towards light nanosources. The experiments have been carried out by integrating structure. This possesses many advantages including high resolution wavelength shift, signal-to-noise ratio (OSNR) of about 50~dB, the small...
Abstract Surface-enhanced Raman scattering (SERS) is a powerful spectroscopic technique for ultrasensitive and selective bio-chemical detection due to its capability of providing “fingerprint” information molecular structures in low concentrations even at single level. In this work, we present the silver nanoparticles/porous silicon (AgNPs/PSi) hybrid as SERS substrates prepared by fast, straightforward effective method using PSi immersion plating nitrate (AgNO 3 ) solution. The nano-silvers...
In this paper, we report a new type of refractometer based on D-shaped fiber Bragg grating (FBG) integrated in loop-mirror optical laser. This proposed sensor is used wavelength interrogation method, which the FBG applied as refractive index (RI) sensing probe and mirror to select mode The prepared by removal portion cladding covering means side-polishing technique. laser with saturated pump technique, characteristics signals have been improved obtain stable intensity, narrower bandwidth...