https://ro.uow.edu.au/cgi/viewcontent.cgi?article=4415&context=aiimpapers

Functionalizing graphene with titanate coupling agents as reinforcement for one-component waterborne poly(urethane-acrylate) anticorrosion coatings

Development of porous, antibacterial and biocompatible GO/n-HAp/bacterial cellulose/β-glucan biocomposite scaffold for bone tissue engineering

Reduced graphene oxide nanosheets doped by Cu with highly efficient visible light photocatalytic behavior

Highly efficient solar desalination and wastewater treatment by economical wood-based double-layer photoabsorbers

We present high mode-locking performances from an erbium-doped fiber laser (EDFL) by using graphene oxide (GO) and reduced graphene oxide (r-GO) as saturable absorbers (SA) deposited onto the polished surface of a D-shaped optical fiber. The samples were prepared with different concentrations and its characterization was performed by using an optical microscope, a Raman spectrometer, nonlinear saturable absorption measurements, polarization setup, and laser mode-locking analysis. As a 1550-nm polarizer, the best GO (r-GO) samples exhibited higher polarization extinction ratio (PER) of 7.94 (7.65) dB, corresponding to 84 (83) %, both showing similar graphene TE absorption behavior. In a managed-intracavity dispersion laser, broadest bandwidths of 27.2 and 24.1 nm and the corresponding shortest pulse duration of 190 fs could be generated when incorporating the SA with high modulation depth (above 20%), being so far the best mode-locking results ever reported in the literature for GO and r-GO SA onto D-shaped optical fibers in EDFL.

Graphene oxide and reduced graphene oxide as saturable absorbers onto D-shaped fibers for sub 200-fs EDFL mode-locking

Reduced graphene oxide (rGO) was prepared by reduction method using various reductants like hydrazine, sodium borohydride and ascorbic acid. XRD and Raman analysis confirmed the effective removal of functional groups in GO. SEM revealed that rGO consists of thin crumpled and disordered sheets closely associated with each other. Blue shift in UV-absorption maxima was due to weak interlayer coupling between the layers of rGO. Third order NLO properties of dispersed rGO were measured by Z-scan technique (532 nm, 50 mW). Both GO and rGO possess self defocusing, saturable absorption and optical limiting behavior. The nonlinear component of refractive index, absorption coefficient and optical susceptibility were found to be 10 −8  cm 2 /W, 10 −3  cm/W and 10 −6  esu respectively. Tunability of NLO coefficients with altering functional groups upon rGO was achieved. rGO prepared using hydrazine with high NLO coefficient and excellent durability, signify the scope of utilizing them as optical limiters.

Effect of reducing agents in tuning the third-order optical nonlinearity and optical limiting behavior of reduced graphene oxide

Barium borate nanorod decorated reduced graphene oxide for optical power limiting applications

Influence of ultrasonication time on solar light irradiated photocatalytic dye degradability and antibacterial activity of Pb doped ZnO nanocomposites

Second and third-order NLO response of 2-amino-5-nitropyridinium tetrafluoroborate

The current cancer Survey reports liver cancer is the second leading cause of cancer related death worldwide. Active liver cancer research is underway as several new therapies are emerging to treat it, with more showing promise. Our present study aims at preparation of silver/zinc oxide nanocomposites for potential applications in antibacterial, anti-inflammatory, anti-cancerous, against human liver cancer cells (hepG2). Silver ions added Zinc oxide (Ag/ZnO) have been synthesized by ultrasonic assisted co-precipitation method. It is found that 3% of silver ions added ZnO were precipitated as nanoplates. And interestingly the observation shows when the concentration of the silver ions increased to 5%, it reduced as nanorods. X-Ray diffraction, SAED patterns and Fourier Transform Infrared Spectrum confirms that silver ions are well attached in ZnO lattice. Ag/ZnO possesses good absorption in the UV region. The reduction in average particle size due to the increase of silver ion concentration in ZnO lattice was confirmed by dynamic light scattering (DLS). SEM and TEM studies witnessed the micro structural transformation from nanoplates (3% Ag) to the rod-like structure on (5% Ag). Ag/ZnO displayed strong antibacterial activity against different pathogens. The obtained results are comparable with standard antibiotics against pathogenic bacteria. Anti-inflammatory study reveals that Ag/ZnO prevents inflammation. Dose dependent response of Ag/ZnO against human liver cancer cells (HepG2) indicates its greater efficacy in killing cancer cells. The selective silver ion concentration (5%) in ZnO have reduced its cross-sectional area with respect to volume. This property helps the silver ion/ZnO nanorods to penetrate efficiently into the affected cells and fight against bacteria, suppress cell inflammation, eradicate the growth of liver cancer cells; which shows feasibility of this composites in further research for therapeutic applications. 

M.B. Jessie Raj

Papers

Effect of reducing agents in tuning the third-order optical nonlinearity and optical limiting behavior of reduced graphene oxide

Barium borate nanorod decorated reduced graphene oxide for optical power limiting applications

Influence of ultrasonication time on solar light irradiated photocatalytic dye degradability and antibacterial activity of Pb doped ZnO nanocomposites

Second and third-order NLO response of 2-amino-5-nitropyridinium tetrafluoroborate

Synthesis of ultrasonic assisted co-precipitated Ag/ZnO nanorods and their profound anti-liver cancer and antibacterial properties