The influences of post-annealing temperatures on fabrication graphitic carbon nitride, (g-C3N4) thin film

Nurul Aida Mohamed, Javad Safaei, Aznan Fazli Ismail, Muhammad Fareez Amir Mohd Jailani, Muhammad Najib Khalid, Mohamad Firdaus Mohamad Noh, Amin Aadenan, Sharifah Nurain Syed Nasir, Jagdeep S. Sagu, Mohd Asri Mat Teridi

Research output: Contribution to journalArticle

Abstract

In this study, g-C3N4 was synthesized from urea and then was fabricated into thin films using spin-coating followed by post- annealing in the temperature range of 150 °C–500 °C. Use of methanol rather than water as the solvent for preparation of the spin coating suspension proved to be beneficial. The chemical bond structure, morphology, and optical properties of g-C3N4 thin films depend on the post-annealing temperature. Post annealing at 350 °C is the optimum temperature, manifested by a strong/sharp intensity peak of triazine and C–N bond in the g-C3N4 network by FT-IR. The average roughness (sa) of the g-C3N4 thin film decreased with increasing temperatures due to the decomposition occurring on the polymeric g-C3N4 thin film. Post annealing in the temperature range of 150 °C to 350 °C shows a reduction in the energy band gap from 2.79 eV to 2.71 eV, however annealing at higher temperatures (350 °C to 500 °C) resulted in larger energy band gaps of ~2.71 eV to 2.85 eV. After optimization of the post annealing temperature, the photocurrent density reached the value of ~20.73 μA cm−2 at 1.23 V versus Ag/AgCl in 0.5 M Na2SO4 electrolyte solution (pH 7).

Original languageEnglish
Pages (from-to)92-100
Number of pages9
JournalApplied Surface Science
Volume489
DOIs
Publication statusPublished - 30 Sep 2019

Fingerprint

carbon nitrides
Carbon nitride
Annealing
Fabrication
Thin films
fabrication
annealing
thin films
Spin coating
Temperature
energy bands
temperature
coating
Band structure
Energy gap
Triazines
chemical bonds
ureas
Chemical bonds
photocurrents

Keywords

  • Dispersion method
  • g-CN thin film
  • Photoelectrochemical (PEC)
  • Post-annealing

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Physics and Astronomy(all)
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

Cite this

The influences of post-annealing temperatures on fabrication graphitic carbon nitride, (g-C3N4) thin film. / Mohamed, Nurul Aida; Safaei, Javad; Ismail, Aznan Fazli; Jailani, Muhammad Fareez Amir Mohd; Khalid, Muhammad Najib; Noh, Mohamad Firdaus Mohamad; Aadenan, Amin; Nasir, Sharifah Nurain Syed; Sagu, Jagdeep S.; Mat Teridi, Mohd Asri.

In: Applied Surface Science, Vol. 489, 30.09.2019, p. 92-100.

Research output: Contribution to journalArticle

Mohamed, Nurul Aida ; Safaei, Javad ; Ismail, Aznan Fazli ; Jailani, Muhammad Fareez Amir Mohd ; Khalid, Muhammad Najib ; Noh, Mohamad Firdaus Mohamad ; Aadenan, Amin ; Nasir, Sharifah Nurain Syed ; Sagu, Jagdeep S. ; Mat Teridi, Mohd Asri. / The influences of post-annealing temperatures on fabrication graphitic carbon nitride, (g-C3N4) thin film. In: Applied Surface Science. 2019 ; Vol. 489. pp. 92-100.
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