Nano-Enriched and Autonomous Sensing Framework for Dissolved Oxygen

Abstract

This paper investigates a nano-enhanced wireless sensing framework for dissolved oxygen (DO). The system integrates a nanosensor that employs cerium oxide (ceria) nanoparticles to monitor the concentration of DO in aqueous media via optical fluorescence quenching. We propose a comprehensive sensing framework with the nanosensor equipped with a digital interface where the sensor output is digitized and dispatched wirelessly to a trustworthy data collection and analysis framework for consolidation and information extraction. The proposed system collects and processes the sensor readings to provide clear indications about the current or the anticipated dissolved oxygen levels in the aqueous media.

Electrospun PVA Polymer Embedded with Ceria Nanoparticles as Silicon Solar Cells Rear Surface Coaters for Efficiency Improvement

“…Fluorescence emission appears at wavelength approximately equals to 520 nm due to the active ceria nanoparticles which has fluorescence emission according to the tri-valent cerium ions. In the range of <1 wt % of ceria NPs, as shown in Figure 4, the fluorescence intensity peak increases with increasing the concentration due to more formed optical tri-valent states of cerium ions with corresponding electron transitions of 5d-4f levels [11]. However, the increase of higher ceria nanoparticles concentration above 1 wt % leads to decrease fluorescence emission intensity peaks.…”

“…Then, in order to measure the photoluminescence intensity, the experimental apparatus used is the same setup discussed in other of our related research papers such as Ref. [11]. In this setup, violet LED of a center wavelength of 430nm (Thorlab, Newton, NJ, USA) as optical excitation source is exposed to the synthesized nanoparticles solution and a monochromator is located beyond the excited sample perpendicular to the excitation source for minimum scattering impact.…”

“…Ceria nanoparticles attract a great research and commercial interests due to its capacity of oxygen storage and optical characteristics of optical conversions in many applications related to medical, environmental, and sustainable energy fields [9,10]. Ceria nanoparticles can be synthesized to be active with tri-valent cerium ions associated with charged oxygen vacancies [11]. These Ce 3+ ions associated with the oxygen vacancies formations play the role of making ceria nanoparticles being a conductive material using hopping mechanism.…”

Optical fluorescent spider silk electrospun nanofibers with embedded cerium oxide nanoparticles

“…15,16 These characteristics allow ceria NPs to find their possible applications in cancer treatment, energy applications (solar cells), or detection tools (e.g., oxygen and peroxide sensors). [17][18][19] Cerium ions could exist in either an active trivalent state (Ce 3þ ) with associated charged oxygen vacancies or nonactive (Ce 4þ ) with no formed O-vacancies, with a major possibility of having mixed ionization states as a nonstoichiometric compound CeO 2−x . The trivalent cerium ions show fluorescence characteristics when are exposed to UV light.…”

Fluorescence intensity and lifetime quenching of ceria nanoparticles as optical sensor for tiny metallic particles

“…1,2 These promising properties are useful in many applications related to the medical, environmental, and sustainable energy fields. [3][4][5] Depending on the oxidation state of cerium ions, ceria could exist in two forms: active with associated charged oxygen vacancies (O-vacancies) associated to trivalent ionization state of cerium ion (Ce 3þ ) and nonactive ceria with no formed O-vacancies according to the normal cerium ion of (Ce 4þ ). 6 The formed active (Ce 3þ ) ions undergo a relaxation process from 5d-4f transitions under near-UV excitation, which results in a green wavelength fluorescence photons emission around 520-nm wavelength.…”