A5005858340- ZnO doping and properties
- Advanced Photocatalysis Techniques
- Gold and Silver Nanoparticles Synthesis and Applications
- Gas Sensing Nanomaterials and Sensors
- TiO2 Photocatalysis and Solar Cells
- Quantum Dots Synthesis And Properties
- Copper-based nanomaterials and applications
- Membrane Separation Technologies
- Plasmonic and Surface Plasmon Research
- Analytical Chemistry and Sensors
- Advanced biosensing and bioanalysis techniques
- Electrospun Nanofibers in Biomedical Applications
- Advanced Nanomaterials in Catalysis
- Ga2O3 and related materials
- Neonatal Health and Biochemistry
- Perovskite Materials and Applications
- Nanoparticles: synthesis and applications
- Corrosion Behavior and Inhibition
- Laser-Ablation Synthesis of Nanoparticles
- Protein Interaction Studies and Fluorescence Analysis
- Characterization and Applications of Magnetic Nanoparticles
- Advanced Fiber Laser Technologies
- Advanced Fiber Optic Sensors
- Microplastics and Plastic Pollution
- Nanofabrication and Lithography Techniques
Asian Institute of Technology
2016-2025
Sultan Qaboos University
2014-2018
Water Research Institute
2015
S.N. Bose National Centre for Basic Sciences
2010
Abstract With an ever-increasing human population, access to clean water for use is a growing concern across the world. Seawater desalination produce usable essential meet future demand. Desalination processes, such as reverse osmosis and multi-stage flash have been implemented worldwide. Reverse most effective technology, which uses semipermeable membrane under applied pressure. However, biofouling main issue faced by plants, requires continuous cleaning or regular replacement of membranes....
Hydrothermally grown ZnO nanorods have inherent crystalline defects primarily due to oxygen vacancies that enhance optical absorption in the visible spectrum, opening up possibilities for light photocatalysis. Comparison of photocatalytic activity and nanoparticle films on a test contaminant methylene blue with irradiation at 72 kilolux (klx) showed are 12–24% more active than nanoparticulate films. This can be directly attributed increased effective surface area adsorption target molecules....
Abstract Herein we explore the role of localized plasmonic heat generated by resonantly excited gold (Au) NPs on visible light driven photocatalysis process. Au are deposited surface vertically aligned zinc oxide nanorods (ZnO NRs). The under 532 nm continuous laser excitation (SPR excitation) was experimentally probed using Raman spectroscopy following phonon modes ZnO. Under resonant temperature at Au-ZnO NRs reaches up to about 300 °C, resulting in almost 6 times higher apparent quantum...
Abstract: A simple microwave-assisted (MWI) wet chemical route to synthesize pure anatase phase titanium dioxide (TiO2) nanoparticles (NPs) is reported here using tetrachloride (TiCl4) as starting material. The as-prepared TiO2 NPs were characterized by electron microscopy, X-ray diffraction, UV/visible absorption spectroscopy, and infrared Raman spectroscopic techniques. Further modification of the was carried out incorporating plasmonic silver (Ag) graphene oxide (GO) in order enhance...
Diagnosis of osteomyelitis presents a formidable challenge. Lack pathognomonic clinical sign(s) and diagnostic tests that can diagnose at an early stage contribute to this difficulty. If the diagnosis is not made early, disease becomes very difficult eradicate lead limb threatening potentially life-threatening complications. Staphylococcus aureus most common organism causing osteomyelitis. Raman Spectroscopy provides information about molecular vibration could be harnessed as spectral...
Herein, we developed a surface-enhanced Raman spectroscopy (SERS)-based aptasensor platform by modifying gold (Au) nanoparticle SERS substrates with thiol-containing aptamer for sensitive and selective detection of paraquat (PQ), commonly used herbicide weed grass control. The Au substrate in this study is commercial (ONSPEC-Lite, https://www.nectec.or.th/en/innovation/product-innovation/onspec-series.html) our group at NECTEC, Thailand. average size the 59 ± 17 nm. A thiol-modified PQ77-SH...
Zinc oxide (ZnO) nanorods decorated with gold (Au) nanoparticles have been synthesized and used to fabricate dye-sensitized solar cells (DSSC). The picosecond-resolved, time-correlated single-photon-count (TCSPC) spectroscopy technique was explore the charge-transfer mechanism in ZnO/Au-nanocomposite DSSC. Due formation of Schottky barrier at ZnO/Au interface higher optical absorptions photoelectrodes arising from surface plasmon absorption Au nanoparticles, enhanced power-conversion...
Improving the performance of photoactive solid-state devices begins with systematic studies metal–semiconductor nanocomposites (NCs) upon which such are based. Here, we report photo-dependent excitonic mechanism and charge migration kinetics in a colloidal ZnO–Au NC system. By using picosecond-resolved Förster resonance energy transfer (FRET) technique, have demonstrated that excited ZnO nanoparticles (NPs) resonantly visible optical radiation to Au NPs, quenching defect-mediated emission...
Environmental pollution from human and industrial activities has received much attention as it adversely affects health bio-diversity. In this work we report efficient visible light photocatalytic degradation of phenol using supported zinc oxide (ZnO) nanorods explore the role surface defects in ZnO on activity. were synthesized glass substrates a microwave-assisted hydrothermal process, while defect states controlled by annealing at various temperatures characterized photoluminescence X-ray...
Visible light photocatalytic activity of the plasmonic gold–zinc oxide (Au–ZnO) nanorods (NRs) is investigated with respect to surface defects ZnO NRs, controlled by annealing NRs in ambient at different temperatures.
This paper reports on UV‐mediated enhancement in the sensitization of semiconductor quantum dots (QDs) zinc oxide (ZnO) nanorods, improving charge transfer efficiency across QD‐ZnO interface. The improvement was primarily due to reduction interfacial resistance achieved via incorporation UV light induced surface defects nanorods. photoinduced were characterized by XPS, FTIR, and water contact angle measurements, which demonstrated an increase (oxygen vacancies) ZnO crystal, leading active...
Light-harvesting nanohybrids (LHNs) are systems composed of an inorganic nanostructure associated with organic pigment that have been exploited to improve the light-harvesting performance over individual components. The present study is focused on developing a potential LHN, attained by functionalization dense arrays ZnO nanorods (NRs) biologically important hematoporphyrin (HP), which integral part red blood cells (hemoglobin). Application spectroscopic techniques, namely, Fourier transform...
In recent years, nanotechnology has gained significant interest for applications in the medical field. this regard, a utilization of ZnO nanoparticles efficient degradation bilirubin (BR) through photocatalysis was explored. BR is water insoluble byproduct heme catabolism that can cause jaundice when its excretion impaired. The photocatalytic activated by non-radiative energy transfer pathway be influenced surface defect-states (mainly oxygen vacancies) catalyst nanoparticles. These were...
Benzene, toluene, ethylbenzene and xylenes (BTEX) are some of the common environmental pollutants originating mainly from oil gas industries, which toxic to human as well other living organisms in ecosystem. Here we investigate photocatalytic degradation BTEX under visible light irradiation using supported zinc oxide (ZnO) nanorods grown on glass substrates a microwave assisted hydrothermal method. ZnO were characterized by electron microscopy, X-ray diffraction (XRD), specific surface area,...
Temperature‐dependent in‐situ Raman spectroscopy is used to investigate the phase transformation of zinc metastannate (ZnSnO 3 ) orthostannate (Zn 2 SnO 4 induced upon annealing in ambient. ZnSnO microcubes ( MC s) were synthesized at room temperature using a simple aqueous synthesis process, followed by characterization electron microscopy, X‐ray diffraction XRD ), Fourier transform infrared FTIR spectroscopy, and thermogravimetric analysis TGA ). Annealing s was carried out up 1000°C,...
Different-sized, 3-mercaptopropionic acid (MPA) stabilized CdTe quantum dots (QDs) have been prepared in aqueous solution, and potential cosensitization of such QDs ZnO nanorod (NR)-based dye-sensitized solar cells (DSSCs) has established. The results presented this study highlight two major pathways by which may contribute to the net photocurrent a DSSC: (1) direct injection charge carriers from semiconductor via photoinduced electron transfer (PET) (2) an indirect excitation sensitizing...