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Articles by N.M. Mohamed
Total Records ( 3 ) for N.M. Mohamed
  A.R. Kermany , N.M. Mohamed and B. Singh
  Studies on gas sensor technology have intensified with the increasing demand in many fields which require high safety standard. In order to realize this aspect of utilization, gas sensors with improved sensitivity, selectivity and fast response time are critically needed to be developed. With the discovery of carbon nanotubes (CNTs), development is now focused towards CNT-based sensors because of their inherent properties such as small size, high strength, high electrical conductivity, low voltage operation, good stability, long lifetime and large surface area. CNTs are used as the active component in gas sensors. With ionization mechanism, the gas is sensed by measuring its unique electric field breakdown voltage. The non-aligned CNT has been tested as the gas sensing element, but there is still a critical need to produce and test vertically aligned CNTs, since they result in a higher electric field and lower breakdown voltage, producing a more efficient gas sensing device. The objective of the research is to improve the performance of the ionization-based gas sensor using aligned carbon nanotubes array. Testing has been done using different equipments to check the characteristics of the Multi-Walled CNT (MWCNT) sample in comparison with the non-aligned CNTs which was previously designed.
  A.A.K. Mastan , S.S. Ahmedullah and N.M. Mohamed
  Titanium dioxide (titania) nanomaterials have been extensively studied for various applications. It is mainly applied as white pigment to provide whiteness and opacity to different kinds of products such as coatings, paints, foods and etc. Titania nanomaterials can be produced using various methods, as such the optimization of methods used is the key to produce nanomaterials with desired properties. The objective of the work is to study the hydrothermal growth parameters, such as the effect of treatment time and sodium hydroxide concentration (NaOH) on the nanomaterials produced. Titania P25 (Degussa, Germany) and concentrated NaOH were treated hydrothermally under various conditions. Hydrothermal treatment for 12 and 24 h at 150°C produced nanoparticles, while treatment for 48 h at 150°C produced nanotubes. Analysis of nanomaterials formed shows nanoparticles are in the range of 80 to 120 nm. The results further indicate the formation of hydrous titanate molecule. This work allows for better understanding of the parameters that control the growth of the titania nanomaterials. This is very important as it can be used to produce titania nanomaterials with various surface morphology for all kinds of applications.
  S. Shukrullah , N.M. Mohamed , M.S. Shaharun and M.Y. Naz
  In recent years, the carbon nanotubes (CNTs) have remained the most discussed materials due to their distinctive characteristics and potential industrial applications. These materials have brought revolutionary changes in the field of medical treatment, electronic devices, communication, sensors, energy storage, etc. Among the various practiced techniques, the Fluidized Bed Catalytic Chemical Vapor Deposition (FBCCVD) is the most pronounced technique for mass production of carbon nanotubes. Although, FBCCVD is a scalable and relatively low cost technique for bulk production of CNTs, still some of the dominant process parameters impacting the CNTs nucleation and growth should be more understood. Better control over these parameters would help the researchers to improve CNTs morphology, to optimize productivity and to scale up the process parameters. Therefore, this study includes a general overview of FBCCVD and other key parameters effecting CNTs formation. The main objective of the presented literature review is to discuss and elaborate the scientific phenomena behind this process and to sketch a future roadmap.
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