This study aimed to enhance the field electron emission (FEE) properties of carbon nanotubes (CNTs) synthesized from waste cooking palm oil combined with zinc oxide (ZnO) to produce CNTs/ZnO nanocomposites. The methods used in this study were single and multi-step depositions. The single-step deposition method was done by directly mixing the CNTs and ZnO precursors and they were synthesized using thermal chemical vapor deposition (TCVD) method for 30 minutes. Meanwhile, the multi-step deposition process was carried out by combining TCVD and sol-gel immersion methods to fabricate CNTs/ZnO nanocomposites. There were three different ZnO nanostructures namely nanorods, nanoflowers and nanorods-nanoflakes which were composited with CNTs via multi-step deposition process. The obtained samples were analyzed using electron microscopy, energy dispersive X-ray, micro- Raman spectroscopy, X-ray diffraction spectroscopy, photoluminescence spectroscopy and four-point probe current-voltage measureme.....

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Graphene has attracted the attention of researchers as it shows exceptional electrical, mechanical, and thermal properties that are beneficial for various applications, including flexible sensors and supercapacitors. Therefore, much laboratory work was conducted to study further potential application of graphene. However, complex procedures and waste consideration are other challenges for developing graphene-based-application devices. Therefore, using a density functional theory (DFT) to intensively study graphene and its potential to be combined with various materials, resulting in a lower-cost and more efficient approach. This review provides a comprehensive overview of the fundamental theory in DFT, followed by graphene and its hybrids in computational work. Hybridizing graphene with other nanomaterials significantly modifies its bandgap and density of state, which are potential for sensing and electronic devices. Moreover, an in-depth analysis of open-source and commercial software.....

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