Despite considerable research the evidence around the wide applications in the nanomedicine and nanophotonic area of gold-silver (Au–Ag) nanocolloids remains equivocal and under exploration. Due to their physical properties, enhanced permeability, high fluorescent, surface area to volume ratio, retention effect, localized surface plasmon resonance (LSPR) and controlled perfusion of drugs, made Au–Ag nanoparticles is over interested. Hence, we produced Au–Ag nanocolloids using nanosecond pulse laser ablation in liquid (NPLAL) technique. Targets of Au and Ag were submerged individually inside the cubic vessel fulfilled by 8 mL of glycol liquid media and vertically ablated with different pulse laser ablation (PLA) energy (50, 100, 150 and 200 mJ). The influence of the PLA energy (at fundamental wavelength 1064 nm) on the optical properties, morphology, particle size distribution, and chemical structure of the obtained colloidal Au–Au NPs was established. UV-Vis and FTIR spectrophotometers have been utilized to determine the absorbance characteristics and chemical functional groups of Au–Ag nanostructures, respectively. The attained of Au-Ag nanostructure exhibits a single-surface plasmon resonance (SPR) band, positioned between SPR bands of the monometallic and a surface bonding functional group (e.g. carboxyl or hydroxy groups). The proposed technique can be a basis for the developing complex compositions/colloids with unique and optimal physical properties may use for developing future nanomedicinal and nanophotonics.
Research on hybrid graphene with other two-dimensional materials has gained considerable attention owing to their potential applications beyond single components. Through our first principles analysis via density functional theory, graphene-molybdenum disulphide (MoS2) demonstrated a band gap opening by 2 meV, from gapless graphene when MoS2 layer is introduced into the structure. The simulated graphene-MoS2 has a direct band gap situated at K point of Brillouin zone with preserved Dirac properties of graphene. The experimental studies on graphene-MoS2 also have been performed by preparing graphene-MoS2-chitin nanocomposite through facile liquid-phase exfoliation method. Apart from energy gap using Tauc relation, the physical morphology and nonlinear properties of the material were systematically characterized. Graphene-MoS2-chitin exhibits a modulation depth of 10.5%, which is lower than individual graphene but higher than individual MoS2. Further investigation on the material’s performance was done by integrating the fabricated film into Erbium-doped fiber laser. Stable nanosecond pulse laser operation was realized with graphene-MoS2-chitin hybrid saturable absorber. The pulse width was measured to be 156.4 ns with repetition rate of 1.89 MHz, corresponding to a peak power of 56.13 mW and pulse energy of 8.78 nJ.
A non-contact fiber optic displacement sensor was used for sugar concentration sensing. A concentric fiber optic bundle and sucrose solutions were used as the fiber probe and sugar samples respectively. Concentration of samples used were in the range of 9% to 33% weight percentages. The fiber probe was displaced above the sample surfaces and displacement curves were recorded. There were two peaks were observed in the displacement curve for each sample. The distance between peaks increases linearly as concentration increases and it was used to evaluate the sensing performance. In term of the performance, the sensitivity and linearity obtained were 0.08295 mm/% and 96% respectively.
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