Kamrosni Abdul Razak
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Preferred name
Kamrosni Abdul Razak
Official Name
Razak, Kamrosni Abdul
Alternative Name
Abdul Razak, Kamrosni
Razak, K. Abdul
Razak, Kamrosni Ab
Razak, Kamrosni Abdul
Razak, K. A.
Abdul Razak, K.
K., Abdul Razak
Main Affiliation
Scopus Author ID
57207592874
Researcher ID
DNW-1117-2022

Research Output
Now showing 1 - 5 of 5
  • Publication
    Sintesis filem nipis AG/TIO₂ melalui kaedah sol-gel untuk aplikasi pembersihan diri
    ( 2019)
    Kamrosni Abdul Razak
    Titanium dioxide (TiO₂) thin film coating has attracted tremendous attention from many researchers due to its light absorption and photocatalytic properties, which make it suitable to be used for self-cleaning applications. In this research, the Ag/TiO₂ thin film was produced by using a simple and fast sol-gel spin coating method. By using a developed formulation, the Ag/TiO₂ thin film coating can be produced in 25 minutes of time. The preparation of the Ag/TiO₂ thin film coating can be divided into three different parameters. For the first parameter, the different concentration of AgNO₃ solution was used. The second parameter involved the different annealing temperatures, while the third parameter studied on the influence of polyethylene glycol (PEG) addition onto the formation of the thin film. The synthesized thin film coatings were characterized by using an X-ray diffraction (XRD), scanning electron microscope (SEM) and atomic force microscopy (AFM). The light absorption study was conducted by using a UV-visible (UV-Vis) spectroscopy. The wettability and photocatalytic testing were also conducted. From the results, the addition of 0.1 M of AgNO₃ solution had produced the Ag/TiO₂ thin film with smooth morphology and homogenously coated over the indium thin oxide (ITO) glass substrate. The optical property was enhanced where the light absorption was extended into the visible light range with reducing the energy level from 3.30 eV to 3.10 eV, compared to the TiO₂ thin film that was produced without the addition of AgNO₃. The film also had the lowest water contact angle and exhibited the best self-cleaning behavior with highest decomposition of the methylene blue solution, which is almost 60%. In term of annealing temperature, the optimum temperature for obtaining an anatase (TiO₂) structure with small particles size and homogenous surface morphology was 500 ⁰C. The film light absorption was found to be the highest with lowest energy level, 3.10 eV. The film that was annealed at 500 ⁰C also showed the lowest water contact angle, which is 11.30o and the best self-cleaning properties where more than 70% of the methylene blue solution can be decomposed in 150 minutes. The addition of 0.15 g of PEG resulted in small, homogenous porous structure with 19.6 nm of the particle size. The film had a good absorption in the visible light range with energy level of 2.65 eV and had almost 80% of photocatalytic decomposition of methylene blue in 150 minutes. From this research, it can be concluded that the 0.1 M of AgNO₃ concentration, 500oC of annealing temperature and 0.15 g of PEG became an optimum parameter in producing a good self-cleaning Ag/TiO₂ thin film. It was also found that the produced Ag/TiO₂ thin film had a good optical and photocatalytic behavior and suitable to be used in self-cleaning applications.
  • Publication
    Effect of temperature and amount of Ag on TiO₂ thin film synthesised via sol–gel method
    (Springer, 2025-02)
    Dewi Suriyani Che Halin
    ;
    Kamrosni Abdul Razak
    ;
    Dharshini Karikalan
    ;
    Lukasz Kaczmarek
    ;
    Sebastian Miszczak
    ;
    Ayu Wazira Azhari
    ;
    Mohd Arif Anuar Mohd Salleh
    ;
    Nur Izzati Muhammad Nadzri
    ;
    Juyana A. Wahab
    ;
    Mohd. Mustafa Al Bakri Abdullah
    TiO₂ sol was produced via the sol–gel method with different amounts of AgNO₃ as the source of Ag. The Ag/TiO₂ thin film was obtained by spin coating and was annealed at various annealing temperatures (300°C, 400°C and 500°C) for 1 h. The effect of different amounts of AgNO₃ and different annealing temperatures on the TiO₂ thin films was studied by characterising the phase composition, surface morphology and water contact angle. Results from the x-ray diffraction (XRD) pattern show that with the addition of AgNO₃, Ag/TiO₂ can be formed at low annealing temperatures (300°C). At increased annealing temperatures (400°C and 500°C) and amounts of AgNO₃ (1.0 ml and 1.5 ml), Ag₂O and Ag₃O4 phases were observed. Flakes or flaky islands were formed on the thin film due to thermal expansion mismatch between the film and substrate, residual stress within the film or the release of volatile species when annealed at a low temperature of ⁓300°C. Increasing the temperature to 500°C resulted in the growth and coalescence of the flaky islands by the surface diffusion of adsorbed atoms (adatoms) and their annexation to the surface of existing nuclei. The water contact angle provides valuable insight into the surface interactions between water droplets and the surface of Ag/TiO₂ thin films. It was found that at 1.5 ml AgNO₃, the increased annealing temperature from 300°C to 500°C decreased the water contact angle of Ag/TiO₂ thin films from 83.86° to 34.62°, forming superhydrophilic properties, which indicated its excellent potential as a photocatalyst.
  • Publication
    The effect of polyethylene glycol addition on wettability and optical properties of GO/TiO2 thin film
    ( 2021)
    Azliza Azani
    ;
    Dewi Suriyani Che Halin
    ;
    Kamrosni Abdul Razak
    ;
    Mohd. Mustafa Al Bakri Abdullah
    ;
    Marcin Nabiałek
    ;
    Muhammad Mahyiddin Ramli
    ;
    Mohd Fairul Sharin Abdul Razak
    ;
    Andrei Victor Sandu
    ;
    Wojciech Sochacki
    ;
    Tomasz Skrzypczak
    Modification has been made to TiO2 thin film to improve the wettability and the absorption of light. The sol-gel spin coating method was successfully used to synthesize GO/TiO2 thin films using a titanium (IV) isopropoxide (TTIP) as a precursor. Different amounts of polyethylene glycol (PEG) (20 to 100 mg) were added into the parent sol solution to improve the optical properties and wettability of the GO/TiO2 thin film. The effect of different amounts of PEG was characterized using X-ray diffraction (XRD) for the phase composition, scanning electron microscopy (SEM) for microstructure observation, atomic force microscopy (AFM) for the surface topography, ultraviolet–visible spectrophotometry (UV-VIS) for the optical properties and wettability of the thin films by measuring the water contact angle. The XRD analysis showed the amorphous phase. The SEM and AFM images revealed that the particles were less agglomerated and surface roughness increases from 1.21 × 102 to 2.63 × 102 nm when the amount of PEG increased. The wettability analysis results show that the water contact angle of the thin film decreased to 27.52° with the increase of PEG to 80 mg which indicated that the thin film has hydrophilic properties. The optical properties also improved significantly, where the light absorbance wavelength became wider and the band gap was reduced from 3.31 to 2.82 eV with the presence of PEG.
      4  23
  • Publication
    Factors of controlling the formation of Titanium Dioxide (TiO₂) synthesized using Sol-gel method – a short review
    ( 2022)
    Kamrosni Abdul Razak
    ;
    Dewi Suriyani Che Halin
    ;
    Mohd. Mustafa Al Bakri Abdullah
    ;
    Mohd Arif Anuar Mohd Salleh
    ;
    Norsuria Mahmed
    ;
    Azliza Azani
    ;
    V. Chobpattana
    There have been experiments on TiO₂ thin films synthesized utilizing sol-gel techniques. The sol-gel method is a straightforward technology that gives numerous benefits to the researcher, for instance, material's reliability, reproducibility, and controllability. Following from there, it can be utilized to make high-quality nano-structured thin films. According to previous studies, the TiO₂ films' characteristics occur to be highly dependent on the production parameters and initial materials utilized. Controlling the formation of TiO₂ thin films with the sol-gel method was momentarily discussed here.
      1  38
  • Publication
    Microstructure evolution of Ag/TiO2 thin film
    ( 2021)
    Dewi Suriyani Che Halin
    ;
    Kamrosni Abdul Razak
    ;
    Mohd Arif Anuar Mohd Salleh
    ;
    Mohd Izrul Izwan Ramli
    ;
    Mohd. Mustafa Al Bakri Abdullah
    ;
    Ayu Wazira Azhari
    ;
    Kazuhiro Nogita
    ;
    Hideyuki Yasuda
    ;
    Marcin Nabiałek
    ;
    Jerzy J. Wysłocki
    Ag/TiO2 thin films were prepared using the sol-gel spin coating method. The microstructural growth behaviors of the prepared Ag/TiO2 thin films were elucidated using real-time synchrotron radiation imaging, its structure was determined using grazing incidence X-ray diffraction (GIXRD), its morphology was imaged using the field emission scanning electron microscopy (FESEM), and its surface topography was examined using the atomic force microscope (AFM) in contact mode. The cubical shape was detected and identified as Ag, while the anatase, TiO2 thin film resembled a porous ring-like structure. It was found that each ring that coalesced and formed channels occurred at a low annealing temperature of 280 °C. The energy dispersive X-ray (EDX) result revealed a small amount of Ag presence in the Ag/TiO2 thin films. From the in-situ synchrotron radiation imaging, it was observed that as the annealing time increased, the growth of Ag/TiO2 also increased in terms of area and the number of junctions. The growth rate of Ag/TiO2 at 600 s was 47.26 µm2/s, and after 1200 s it decreased to 11.50 µm2/s and 11.55 µm2/s at 1800 s. Prolonged annealing will further decrease the growth rate to 5.94 µm2/s, 4.12 µm2/s and 4.86 µm2/s at 2400 s, 3000 s and 3600 s, respectively.
      20  1