Aerosol-assisted chemical vapour deposition of α-Fe2O3 nanoflowers for photoelectrochemical water splitting

Nurul Affiqah Arzaee, Mohamad Firdaus Mohamad Noh, Azhar Ab Halim, Muhammad Amir Faizal Abdul Rahim, Nurul Aida Mohamed, Javad Safaei, Amin Aadenan, Sharifah Nurain Syed Nasir, Aznan Fazli Ismail, Mohd Asri Mat Teridi

Research output: Contribution to journalArticle

Abstract

3-dimensional (3D) nanostructures have gained broad attention in the field of microelectronics and nanotechnology owing to their fascinating properties and potential for novel applications. To enable successful fabrication of the nanostructure, deep understanding on their growth mechanism is an absolute prerequisite. In this study, thin film of hematite (α-Fe2O3) nanoflakes is successfully converted to nanoflowers using aerosol-assisted chemical vapour deposition (AACVD) technique simply by supplying high amount of oxygen and regulating the deposition time. The crystal structure and morphological properties including thickness and roughness of the film are thoroughly investigated to provide a clear explanation on the growth mechanism of α-Fe2O3 by AACVD. Results indicate that (110) crystal plane is the predominant factor that influence the formation of nanoflowers with unique pyramidal nanostructure. This structure causes the film thickness to increase linearly while the surface roughness shows a logarithmic growth trend. The samples are further employed in photoelectrochemical (PEC) water splitting as photoanode where 40 min deposition period is the optimum condition for achieving PEC photocurrent density of up to 585 μA/cm2 at 1.2 V vs. Ag/AgCl. The major contributor towards the performance enhancement is the large surface area and high light absorption of α-Fe2O3 nanoflowers as this parameter provides greater sites for photocatalytic activity, greater charge generation and enhanced charge carrier separation efficiency.

Original languageEnglish
JournalCeramics International
DOIs
Publication statusPublished - 1 Jan 2019

Fingerprint

Nanoflowers
Aerosols
Chemical vapor deposition
Nanostructures
Water
Surface roughness
Hematite
Charge carriers
Photocurrents
Nanotechnology
Microelectronics
Light absorption
Film thickness
Crystal structure
Oxygen
Fabrication
Thin films
Crystals

Keywords

  • Aerosol-assisted chemical vapour deposition
  • FeO
  • Nanoflakes
  • Nanoflowers
  • Photoelectrochemical water splitting

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Process Chemistry and Technology
  • Surfaces, Coatings and Films
  • Materials Chemistry

Cite this

Aerosol-assisted chemical vapour deposition of α-Fe2O3 nanoflowers for photoelectrochemical water splitting. / Arzaee, Nurul Affiqah; Mohamad Noh, Mohamad Firdaus; Ab Halim, Azhar; Abdul Rahim, Muhammad Amir Faizal; Mohamed, Nurul Aida; Safaei, Javad; Aadenan, Amin; Syed Nasir, Sharifah Nurain; Ismail, Aznan Fazli; Mat Teridi, Mohd Asri.

In: Ceramics International, 01.01.2019.

Research output: Contribution to journalArticle

Arzaee, Nurul Affiqah ; Mohamad Noh, Mohamad Firdaus ; Ab Halim, Azhar ; Abdul Rahim, Muhammad Amir Faizal ; Mohamed, Nurul Aida ; Safaei, Javad ; Aadenan, Amin ; Syed Nasir, Sharifah Nurain ; Ismail, Aznan Fazli ; Mat Teridi, Mohd Asri. / Aerosol-assisted chemical vapour deposition of α-Fe2O3 nanoflowers for photoelectrochemical water splitting. In: Ceramics International. 2019.
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AU - Ab Halim, Azhar

AU - Abdul Rahim, Muhammad Amir Faizal

AU - Mohamed, Nurul Aida

AU - Safaei, Javad

AU - Aadenan, Amin

AU - Syed Nasir, Sharifah Nurain

AU - Ismail, Aznan Fazli

AU - Mat Teridi, Mohd Asri

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AB - 3-dimensional (3D) nanostructures have gained broad attention in the field of microelectronics and nanotechnology owing to their fascinating properties and potential for novel applications. To enable successful fabrication of the nanostructure, deep understanding on their growth mechanism is an absolute prerequisite. In this study, thin film of hematite (α-Fe2O3) nanoflakes is successfully converted to nanoflowers using aerosol-assisted chemical vapour deposition (AACVD) technique simply by supplying high amount of oxygen and regulating the deposition time. The crystal structure and morphological properties including thickness and roughness of the film are thoroughly investigated to provide a clear explanation on the growth mechanism of α-Fe2O3 by AACVD. Results indicate that (110) crystal plane is the predominant factor that influence the formation of nanoflowers with unique pyramidal nanostructure. This structure causes the film thickness to increase linearly while the surface roughness shows a logarithmic growth trend. The samples are further employed in photoelectrochemical (PEC) water splitting as photoanode where 40 min deposition period is the optimum condition for achieving PEC photocurrent density of up to 585 μA/cm2 at 1.2 V vs. Ag/AgCl. The major contributor towards the performance enhancement is the large surface area and high light absorption of α-Fe2O3 nanoflowers as this parameter provides greater sites for photocatalytic activity, greater charge generation and enhanced charge carrier separation efficiency.

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