Dopamine wide range detection sensor based on modified Co3O4 nanowires electrode

Abstract

Ultra-thin cobalt oxide (Co3O4) nanowires grown on gold coated glass substrates by the hydrothermal chemical deposition and have been used as a wide range dopamine potentiometric sensor. An anionic surfactant (sodium dodecylbenzenesulfonate) was used to achieve assisted growth procedure. Moreover, a polymeric membrane containing polyvinyl chloride as plasticized polymer, β-cyclodextrin as ionophore, and potassium tetrakis (4-chlorophenyl) borate as ionic additive were immobilized on the Co3O4 nanostructures through electrostatic adsorption method. X-ray diffraction, x-ray photoelectron spectroscopy, and scanning electron microscopy were used to characterize the electrodes while ultravioletvisible absorption was used to investigate the band gap of the Co3O4 nanostructures. The structural characterization showed a cubic crystalline, pure phase, and nanowires morphology of the Co3O4. However, the morphology is altered when the surfactant concentration has been changed. The Co3O4 chemical modified electrodes were used in potentiometric measurements for dopamine in a 10 −2 M acetic acid/sodium acetate solution having a pH of 5.45. For dopamine range from 10 -9 M to 10 -2 M, the potential response of the sensor electrode was linear with a slope of 52mV/decade. The wide range and high sensitivity of the modified Co3O4 nanowires based sensor for dopamine is attributed to the defects on the metal oxide that is dictated by the used surfactant along with the high surface area-to-volume ratio.

Highly sensitive H2O2 sensor based on Co3O4 hollow sphere prepared via a template-free method

“…Particularly, Co 3 O 4 is an ionic semiconductor with positively polar termination having two Co 2+ , two Co 3+ , and four O 2-ions and negatively polar termination with two Co 3+ and four O 2-ions. [25] The diversity of the polar sites [26] will help to easily detect the charges. Furthermore, Co 3 properties for many applications [33].…”

Nanotechnology for Achieving Green-Economy Through Sustainable Energy

“…Some metal oxide like TiO2 55 and Cd-sulfide nanoarticles have very strong catalytic property 56 which can be highly useful for fabricating cost-effective photoelectrodes used in the production of hydrogen from water splitting 57 . The nano-size structures in photovoltaic 58,59 cells increase the area of exposure of conducting surfaces which enhances the collection of solar energy. The use of mesoporous nanostructures 60 like quantum dots, carbon nanotubes and fullerenes in solar cells makes them cheaper, lighter and increases their efficiency, electrical conductivity, mechanical strength, durability and corrosion resistance [61][62][63] .…”

Chemically Modified Metal Oxide Nanostructures Electrodes for Sensing and Energy Conversion

“…Figure 3.11, shows typical XPS spectra indicating a Co3O4 nanostructure. 103 A wide and short XPS scans are shown in Figure 3.11 (a-c). Figure 3.11b represented Co 2p XPS spectrum of the product.…”

“…However, the lower detection limit needs to be improved because the concentration of dopamine in biological systems is in the range of 10 −8 to 10 −6 M. Moreover, the effect of the organic additives on modifying the morphology and their associated effect on the sensing and even on the electronic structures, as demonstrated in paper I, II and III, it was appealing to seek a more sensitive sensor. In the present paper, 103 an anionic SDBS surfactant was used to achieve assisted growth procedure. After the SDBS-doped Co3O4 nanowires were successfully grown on Au coated glass substrates by the ACG method, the same polymeric membrane used in paper I was used here as well.…”