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Jalal Rouhi,C. H. Raymond Ooi,Shahrom Mahmud,Mohamad Rusop Mahmood 대한금속·재료학회 2015 ELECTRONIC MATERIALS LETTERS Vol.11 No.6
Well-aligned ZnO-ZnS core-shell nano-needle arrays were synthesized using a simple aqueous solution approach to investigate the optical and field emission properties of heterostructure materials. The photoluminescence of the coreshell nano-needles exhibits a distinct enhancement compared with that of uncoated ZnO nano-needles. The UV-vis spectra show that the ZnS shell layer enhances the optical absorption of ZnO nano-needles by decreasing the interface band gap, which indicates the potential application of heterostructures in photovoltaic and solar cells. The core-shell nano-needles exhibit a remarkably high field enhancement factor of 3.74 × 103, a low turn-on field of 2.31 V/μm, and a high time stability. These findings show that the construction of core-shell heterostructure can efficiently improve the field emission performance of ZnO nano-needles, which is a promising route for the development of novel nanoemitters with controllable morphology and as suitable shell materials for heterostructures.
Ahmad Nurin Jazlina,Mohamed Ruziana,Malek Mohd Firdaus,Sanusi Saedah Munirah,Muhamad Myzatul Azlyin,Ismail Ahmad Syakirin,Mahmood Mohamad Rusop 한국탄소학회 2023 Carbon Letters Vol.33 No.2
Combination of liquid-phase exfoliation and hydrothermal method has progressed in recent years mainly on production of 2D materials. In this study, graphene was successfully synthesized via combinatorial of liquid-phase exfoliation and hydrothermal method with the aid of various conductive surfactants perylene-3, 4, 9, 10-tetracarboxylate (PTCA), lithium perylene-3, 4, 9, 10-tetracarboxylate (LiPTCA) and sodium perylene-3, 4, 9, 10-tetracarboxylate (NaPTCA). The effect of the lithium (Li+) and sodium (Na+) cations toward the efficiency of the graphene exfoliation process and its electrical properties was thoroughly investigated. Based on the characterization techniques, it is revealed that NaPTCA is the ideal conductive surfactant to exfoliate graphene sheets. X-ray diffraction spectra verified that the Na+ cation certainly can enhance the exfoliation process by expanding the interlayer spacing. The lateral size of the graphene sheets with Na-PTCA surfactant was the smallest (4.17 µm) as observed from SEM micrograph. The maximum concentration of the graphene yield was achieved up to 0.151 mgmL−1 in NaPTCA surfactant alongside with excellent electrical conductivity of 746.27 Sm−1 and relevant specific capacitance of 129 Fg−1.