ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

On the energy transfer in Bi₂WO₆: E_RedOx-assisted radiative recombination in O₂ and ROS sensing. prospective

Oswaldo Núñez, Lorean Madriz, and Ronald Vargas

Departamento de Procesos y Sistemas, Laboratorio de Fisicoquímica Orgánica y Química Ambiental, Universidad Simón Bolívar (USB), Caracas, Venezuela

E-mail: onunez@usb.ve

Received: 3 July 2024  Accepted: 9 September 2024

Abstract:

Photoluminescence maximum emission signal of colloids based on Bi₂WO₆ suspended in an aqueous solution is blue-shifted as compared to its band gap according to E_{g +} (E_RedOx-E_CB). This process involves the exergonic non-radiative transfer of E_CB electron to E_RedOx and the concomitant radiative emission of a second electron that has gained E_RedOx-E_CB energy presumably by electrons energy levels entanglement induced via simultaneous light excitement of multiple electrons. These results constitute evidence for energy transfer with application in sensing electrolyte-electron-acceptors as reactive oxygen species that may be implemented for example in cancer and aortic dissection detection and treatment.

Graphical abstract

Bi₂WO₆ electrons from water colloidal solution are entangled by light (Plasmon resonance) and excited from the Bi₂WO₆ valence band (VB) to its conduction band (CB). Electron 1 moves up the gradient at the surface and is transferred to the acceptor (E_RedOx) at the electrolyte. The gained energy, E_RedOx—E_Cb, is transferred to electron 2 via their entangled energy levels. Electron 2 then decays to the VB emitting light at the Bi₂WO₆ band gap (E_g) plus the energy gained. Sensing of the E_RedOx and [RedOx] is then obtained.

Keywords: Bi2WO6-Water colloidal suspension; ERedOx frequency and intensity sensing; Transient and steady-state photoluminescense; Cancer detection and treatment

Full paper is available at www.springerlink.com.

DOI: 10.1007/s11696-024-03692-z

Chemical Papers 78 (15) 8523–8529 (2024)