Electrochemical determination of 4-nitrophenol in environmental water samples using porous graphitic carbon nitride-coated screen-printed electrode.

We demonstrate a facile preparation of novel oxidized graphitic carbon nitride (O-gCN) applied as an efficient electrocatalyst for highly sensitive electrochemical detection of 4-nitrophenol (4-NP) in environmental water samples. As-prepared O-gCN were characterized by attenuated total reflection infrared spectroscopy, X-ray photoelectron spectroscopy, and X-ray diffraction methods for the confirmation of different functional groups and structural phase of O-gCN. The surface morphology of the O-gCN was characterized using field emission scanning electron microscopy and high-resolution transmission electron microscopy.

Synthesis, structural characterization and electrochemical studies switching of MWCNT/novel tetradentate ligand forming metal complexes on PIGE modified electrode by using SWASV.

A novel sensor of a square wave anodic stripping voltammetric (SWASV) determination of Pb(II) and Cd(II) with a Multiwall carbon nanotube MWCNT/(Hbpabza) novel tetradentate carboxamide ligand modified electrode is reported. The ligand was synthesized and prepared by the condensation of 2-pyridinecarboxylicacid and 2-aminobenzylamine, with triphenylphosphite as the activator and tetrabutylammonium bromide as the reaction medium. The ligand was characterized by UV-Visible spectroscopy, Fourier transform infrared spectroscopy, Raman studies, Nuclear magnetic resonance spectroscopy and scanning electron microscope methods.

A nanocomposite consisting of porous graphitic carbon nitride nanosheets and oxidized multiwalled carbon nanotubes for simultaneous stripping voltammetric determination of cadmium(II), mercury(II), lead(II) and zinc(II).

A 3D nanocomposite consisting of porous graphitic carbon nitride nanosheets (p-g-CN-NSs) and oxidized multiwalled carbon nanotubes (O-MWCNTs) was prepared by simultaneous chemical oxidation of bulk g-CN and bulk MWCNTs. This one-step oxidation results in the formation of acidic functional groups on the basal surfaces of both g-CN and MWCNTs. Simultaneously, the O-MWCNTs are incorporated in-situ on the porous structure of p-g-CN.

Simultaneous Determination of Adenine and Guanine Using Cadmium Selenide Quantum Dots-Graphene Oxide Nanocomposite Modified Electrode.

A novel electrochemical sensor was fabricated by immobilizing Cadmium Selenide Quantum Dots (CdSe QDs)-Graphene Oxide (GO) nanocomposite on a paraffin wax impregnated graphite electrode (PIGE) and was used for the simultaneous determination of adenine and guanine. The CdSe QDs-GO nanocomposite was prepared by ultrasonication and was characterized with spectroscopic and microscopic techniques. The nanocomposite modified electrode was characterized by cyclic voltammetry (CV).

Highly potential antifungal activity of quantum-sized silver nanoparticles against Candida albicans.

The antifungal activity of polyvinylpyrrolidone (PVP)-stabilized quantum-sized silver nanoparticles (SNPs) against the growth of Candida albicans has been demonstrated in the present study. C. albicans is a known opportunistic human pathogen causing superficial and systemic infections.

Green synthesized nickel nanoparticles modified electrode in ionic liquid medium and its application towards determination of biomolecules.

An air and moisture stable ionic liquid 1-ethyl-3-methylimidazolium ethyl sulfate (EMIMES) was used as an electrolyte for electropolymerization of L-cysteine followed by electrodeposition of nickel nanoparticles (NiNP) on paraffin wax impregnated graphite electrode (PIGE). The electrodeposited NiNP modified electrode showed good redox activity and stability in 0.1M KOH solution.

Amperometric sensor for the determination of ascorbic acid based on Cobalt hexacyanoferrate modified electrode fabricated through a new route.

A new approach was attempted to prepare a chemically modified electrode using Cobalt hexacyanoferrate (CoHCF) as the redox mediator and to study its stability and electrocatalytic activity for ascorbic acid (AA) oxidation. The basic principle underlying the electrode modification is the coordination of cobalt ion with the amino nitrogen of aniline adsorbed on the surface of a graphite rod. This surface was subsequently derivatized with ferrocyanide to get CoHCF film on the electrode surface.