Nur Syakimah Ismail
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Preferred name
Nur Syakimah Ismail
Official Name
Nur Syakimah, Ismail
Alternative Name
Nur, Syakimah Ismail
Ismail, N. Syakimah
Ismail, Nur Syakimah Binti
Ismail, N. S.
Main Affiliation
Scopus Author ID
56402634600
Researcher ID
HKN-0608-2023

Research Output

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  • Publication
    Fabrication of Graphene Electrode via Graphene Transfer Method for Bisphenol A (BPA) Detection
    ( 2021-01-01)
    Shukri N.I.B.A.
    ;
    Norhayati Sabani
    ;
    Ruslinda A. Rahim
    ;
    Mohamad Faris Mohamad Fathil
    ;
    Syarifah Norfaezah Sabki
    ;
    Nur Hamidah Abdul Halim
    ;
    Nur Syakimah Ismail
    Exposure of BPA is a concern as BPA can seep into food or beverages from containers and can possibly effects on human health especially endocrine systems. An electrochemical-based aptasensor utilizing graphene was developed in detecting endocrine disrupting compound Bisphenol A (BPA, 4,4'-(propane-2,2-diyl) diphenol). The graphene modified electrode was developed via graphene transfer. Fabrication and characterization of graphene transfer was studied in this paper using Scanning Electron Microscopy (SEM) and High-Power Microscope (HPM). In this research, the investigation of interfacial characteristic modified graphene with aptasensor and recognition of BPA with aptasensor had been done using electrochemical impedance spectroscopy (EIS). The increment of charge transfer resistance (Rct) before and after recognition of BPA denoting the accumulation of charge at the electrode surface in this research.
  • Publication
    Effect of heating power towards synthesis of carbon dots through microwave pyrolysis method for optical-based biosensor
    ( 2020-01-08)
    Nur Syakimah Ismail
    ;
    Husain, Umi Shahirah
    ;
    Selvan S.
    ;
    Mordani, Nor Afnia
    ;
    Nurjuliana Juhari
    ;
    Nur Hamidah Abdul Halim
    This study focuses on the effect of heating power in producing carbon dots (CDs) using microwave-assisted pyrolysis from glucose and PEG-200. Glucose is one type of saccharide that contains carbon atom in their structure while PEG-200 is a polymer that acts as a stabilizer. Synthesis of CDs was carried out by using a domestic microwave at different heating power ranging from 300 to 600 Watts. Produced CDs were subjected to dilution, filtering and dialysis procedure for purification purpose. UV-Vis was carried out using PerkinElmer Lambda 35 Spectrophotometer to prove the present of carbon dots in the sample solution. Photoluminescence intensity was observed using Horiba FluoroLog Spectrophotometer together with Horiba iHR550 Imaging Spectrometer to show the emission wavelength and the emission color of CDs prepared. UV-Vis results show the present of CDs in each sample from absorption peaks in the range between 240 nm until 260 nm. The photoluminescence testing shows the emission wavelength of prepared CDs solution is around 430 nm to 570 nm which represent emission color of green-yellow luminescence. From this experiment, CDs that were prepared using a heating power of 450 Watt in 2 minutes and went through the filtering process produce the best luminescence properties. Prepared CDs display electrochemiluminescence (ECL) properties in the presence of co-reactant potassium peroxydisulfate using cyclic voltammetry to pave the way for optical-based biosensor application.
      18  1
  • Publication
    Design of arrayed waveguide grating (AWG) demultiplexer based PMMA for narrow channel spacing
    ( 2020-01-08)
    Nurjuliana Juhari
    ;
    Yusof, Muhammad Fadzliazuan
    ;
    Mohamad Halim Abd. Wahid
    ;
    Nur Syakimah Ismail
    Arrayed Waveguide Grating (AWG) based PMMA polymer that functioning as multiplexer/demultiplexer (mux/de-mux) having good potential in WDM system and interferometer optical sensor. Besides, AWG is suitable for larger count optical signals and good filter response devices. AWG demultiplexer based polymer was simulated using Beam Propagation Method (BPM) under TE mode with 1550 nm central wavelength. This work explores the performance of polymer-based AWG with straight waveguide structure that capable to produce 16-channels AWG device for 100 GHz (0.8 nm) channel spacing. The 16-channels AWG based polymer produces low insertion loss of 3.430 dB and low crosstalk of -24.763 dB. The central wavelength for each output port gives almost similar values with the standard ITU-T DWDM wavelength grid with the smallest difference of 0.5 nm. This proposed device also capable to solve the demand on higher channel capacity especially to support internet usage and the needs of the best communication system.
      18  2