Liu Wei Wen
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Preferred name
Liu Wei Wen
Official Name
Wen, Liu Wei
Alternative Name
Liu, Wei Wen
Wei-Wen, Liu
Liu W., -W.
Main Affiliation
Scopus Author ID
57194266103
Researcher ID
D-2098-2015

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  • Publication
    Graphene synthesis by electrochemical reduction of graphene oxide and its characterizations
    ( 2023-07)
    Nur Syahirah Kholib
    ;
    Liu Wei Wen
    Graphene is one of the nanoscale materials that has attracted many researchers to continue in-depth study on its unique properties where both the graphene oxide (GO) and electrochemical reduced graphene oxide (ERGO) are the derivatives of graphene. GO and ERGO can be further modified chemically for many types of application such as sensor and water filter membrane. However, to restore the electrical property of graphene, GO should be reduced to ERGO. There are several types of reduction methods which are fast to produce good quality and high yield of graphene material. However, those methods use toxic chemicals to reduce GO which can bring negative impact to both human and environment. Therefore, an electrochemical approach can be carried out to solve this issue. This study presents the electrochemical synthesis of GO and electrochemical reduction of ERGO. All characterizations were conducted by using Fourier transform infrared (FTIR) spectroscopy, X-ray Diffraction (XRD) and Scanning Electron Microscopy (SEM).
  • Publication
    Synthesis of few layers graphene sheets from graphite rod via electrochemical exfoliation
    ( 2023-07)
    Siti Nur Adlina Norazman
    ;
    Liu Wei Wen
    Graphene has many excellent properties in mechanical strength, electrical conductivity, optical transparency and thermal conductivity. The basic unit of graphene is made of hexagonal ring of carbon shape. The production of graphene in large amounts can be done using conventional ways such as chemical vapour deposition (CVD). However, the cost production is very high due to high reaction temperature. Therefore, electrochemical exfoliation could become a promising method in future because of its simple, low cost and large-scale production. Electrochemical method is performed in the manner by connecting the graphite rod to the positive terminal (anode) while the copper sheet is connected to the negative terminal (cathode) and both of were immersed into electrolyte with a distance between them. Then, due to the potential difference, the exfoliation of graphite into graphene sheets occurs. X-Ray Diffraction revealed that high amount of exfoliated graphene sheets was synthesized successfully where the peak was seen at approximately 26.60°. Fourier Transform Infrared confirmed the synthesized of graphene oxide (GO) sheets (by using H2SO4 as electrolyte) shows the higher intensity of O-H band because of strongest oxidation behaviour of H2SO4 acid among all electrolytes used in experiment. Besides. SEM images show that the morphologies of the exfoliated graphene sheets have stacked, flaky-like, wrinkled and crumpled structures.
  • Publication
    Improvement synthesis of graphene oxide yield in two steps of intercalation and oxidation of flexible graphite foil by electrochemical exfoliation
    ( 2024-04)
    M. O. Ariffa
    ;
    Liu Wei Wen
    ;
    Foo Kai Loong
    Synthesis of high quality and quantity of graphene by cost-effective methods are highly desirable for various application. In electrochemical exfoliation, graphite foil has been used as carbon source for the synthesis of high yield of graphene flakes. Electrochemical exfoliation is one of the faster and cheaper method to synthesize graphene sheets. In this work, five different types of concentration of sulphuric acid were used for electrochemical exfoliation. The electrochemical cell design where graphite foil as anode and copper foil as cathode which were connected to DC power supply of 5V. To examine the morphology scanning electron microscope (SEM) was employed in which the sheet structures with large lateral dimension and thin graphene flakes. Furthermore, X-ray diffraction (XRD) revealed that exfoliated graphene samples showed a significant peak at about 2θ = 26º corresponded to graphite.