Nor Azura Abdul Rahim
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Preferred name
Nor Azura Abdul Rahim
Official Name
Nor Azura, Abdul Rahim
Alternative Name
Rahim, Nor Azura Abdul
Rahim, N. A. A.
Main Affiliation
Universiti Malaysia Perlis
Scopus Author ID
57203438760
Researcher ID
AAC-3346-2021

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  • Publication
    Enhanced luminescence stability and oxidation–reduction potential of polyfluorene for organic electronics: a review
    ( 2024-06-01)
    Chew K.W.
    ;
    Nor Azura Abdul Rahim
    ;
    Teh P.L.
    ;
    Osman A.F.
    In pursuing sustainable technologies, organic electronic-based materials have witnessed remarkable progress, with polyfluorene (PF) among the blue light-emitting polymers garnering significant attention. PF, renowned for its remarkable light absorption and exceptional optoelectronic properties, exhibits great potential for various applications including display technologies, solar cells, lasers and transistors. Nonetheless, the diverse phases in PF significantly affect the performance of optoelectronic devices, predominantly due to the coexistence of different conformations in thin films, while promising, PF confronts hurdles related to stability and degradation during operation, leading to spectral changes and colour purity issue. Since the early 1990s, various studies have been devoted by researchers to determine the chemical changes in the PF chain and its functional groups after being subjected to different types of degradation with the aim of controlling and retarding the decomposition process. Another alternative strategy is to promote the formation of β-phase in PF, which is characterised by well-ordered conformation. This review aims to provide a comprehensive overview of PF degradation behaviour, modes and mechanisms. Various approaches to delay and suppress PF degradation are discussed. Meanwhile, the role of the β-phase in suppressing PF degradation and enhancing optoelectronic applications has also been highlighted. Thus, scientists are diligently attempting to enhance the formation and stability of the β-phase to improve the performance of optoelectronic applications.
      20  4
  • Publication
    The Effect of Solvents on the Preparation of Poly(9,9-Dioctylfluorene) Thin Films
    ( 2022-01-01)
    Chew K.W.
    ;
    Nor Azura Abdul Rahim
    ;
    Teh Pei Leng
    ;
    Abdul Hisam N.S.
    The optoelectronic properties of Poly(9,9-dioctylfluorene) (PFO) are highly influenced by the existence of a well-defined chain extended “β-phase” conformational isomer. This study aims to evaluate the produced PFO films optical properties. Pristine PFO films and aggregated PFO films were fabricated by the solvent casting method. PFO was first dissolved in chloroform and toluene separately. Meanwhile, for aggregated film, different percentage of methanol (poor solvent) was added to the PFO solution to induce β-phase formation. UV-vis measurement and scanning electron microscopy were used to characterize the films. The results reveal that PFO was fully soluble in chloroform while moderately soluble in toluene. This result was further confirmed by micrograph; the PFO film prepared from chloroform exhibited glassy conformation. While for the aggregation system, the absorption spectra of β-phase becoming more intense as methanol content increase.
      32  4
  • Publication
    Thermal Degradation of Photoluminescence Poly(9,9-dioctylfluorene) Solvent-Tuned Aggregate Films
    ( 2022-04-01)
    Chew K.W.
    ;
    Nor Azura Abdul Rahim
    ;
    Teh Pei Leng
    ;
    Abdul Hisam N.S.
    ;
    Alias S.S.
    The progression of the green emission spectrum during the decomposition of polyfluorenes (PFs) has impeded the development and commercialization of the materials. Herein, we constructed a solvent-tuned aggregated PFO film with the aim of retarding the material’s thermal degradation behavior which causes a significant decline in optical properties as a result of phase transformation. The tuning of the aggregate amount and distribution was executed by applying a poor alcohol-based solvent in chloroform. It emerges that at a lower boiling point methanol evaporates quickly, limiting the aggregate propagation in the film which gives rise to a more transparent film. Furthermore, because of the modulated β-phase conformation, the absorption spectra of PFO films were red-shifted and broadened. The increase in methanol percentage also led to a rise in β-phase percentage. As for the thermal degradation reactions, both pristine and aggregated PFO films exhibited apparent changes in the UV-Vis spectra and PL spectra. In addition, a 97:3 (chloroform:methanol) aggregated PFO film showed a more defined emission spectrum, which demonstrates that the existence of β-phase is able to suppress the unwanted green emission.
      30  2