Effect of inert ambient annealing on structural and defect characteristics of coaxial N-CNTs@ZnO nanotubes coated by atomic layer deposition

H. A. Borbón-Nuñez, D. Domínguez, M. Herrera-Zaldivar, J. M. Romo-Herrera, R. C. Carrillo-Torres, F. F. Castillón, O. E. Contreras-López, G. Soto, H. Tiznado*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

The structure and intrinsic defects of ZnO determine the photogeneration of electron-hole pairs. The control of these characteristics allows for improving the activity of photocatalytic nanostructures. The intrinsic defects of ZnO atomic layer deposited around carbon nanotubes, coaxial N-CNT@ZnO, and its evolution after annealing in a nitrogen atmosphere are studied. TEM showed that the coaxial N-CNT@ZnO structure is preserved up to 500 °C; some damage is seen at 600 and 700 °C. Raman and XPS reveal a low surface defect concentration for as-grown ZnO, increasing to a maximum for the 600 °C annealed sample. Cathodoluminescence shows a broad low-intensity green emission associated with oxygen vacancies of ZnO. The surface defects improved the photocatalytic degradation of amaranth dye, however, damage to the coaxial structure lowers the catalytic activity.

Original languageEnglish
Pages (from-to)29829-29837
Number of pages9
JournalCeramics International
Volume48
Issue number20
DOIs
StatePublished - 15 Oct 2022

Bibliographical note

Funding Information:
This work was supported by DGAPA–UNAM research projects: PAPIIT IN110018, IN103220, IA111622, IN108821 projects, and CONACyT through the FORDECyT project 272894, SENER-CONACyT-117373 and Basic Scientific Research A1-S-26789 and A1-S-17539. The authors would like to thank Irving Fernandez, L. Arce, F. Ruiz, J. Mendoza, J. A. Diaz, I. Gradilla, E. Murillo, and E. Aparicio for their technical assistance. We thank UABC for allowing access to the Bruker D2 PHASER instrument.

Funding Information:
This work was supported by DGAPA– UNAM research projects: PAPIIT IN110018 , IN103220 , IA111622 , IN108821 projects, and CONACyT through the FORDECyT project 272894 , SENER-CONACyT- 117373 and Basic Scientific Research A1-S-26789 and A1-S-17539 . The authors would like to thank Irving Fernandez, L. Arce, F. Ruiz, J. Mendoza, J. A. Diaz, I. Gradilla, E. Murillo, and E. Aparicio for their technical assistance. We thank UABC for allowing access to the Bruker D2 PHASER instrument.

Publisher Copyright:
© 2022 Elsevier Ltd and Techna Group S.r.l.

Keywords

  • ALD
  • Carbon nanotubes
  • Surface defects
  • ZnO

Fingerprint

Dive into the research topics of 'Effect of inert ambient annealing on structural and defect characteristics of coaxial N-CNTs@ZnO nanotubes coated by atomic layer deposition'. Together they form a unique fingerprint.

Cite this