부산대학교 도서관

Conceptual scenarios of temperature effect on property of iron oxide-graphene for synthesis of carbon nanotubes/graphene hybrid material. [Display omitted] • Reduced Fe 2 O 3 /GO was employed as catalyst for synthesizing carbon nanotubes (CNTs) via catalytic chemical vapor deposition. • When the Fe 2 O 3 /GO was employed within a temperature range of 700−900 °C, Fe 2 O 3 was reduced to α-Fe. • The α-Fe could preferably lead to CNT growth on the graphene surface. • The α-Fe was transformed to γ-Fe when the Fe 2 O 3 /GO was subject to the temperature of 1,000 °C, resulting in formation of carbon spheres. • Conceptual scenarios of CNT/graphene hybrid material formation with respect to the pretreatment and synthesis temperature were proposed. Iron oxide embedded on graphene oxide (Fe 2 O 3 /GO) was prepared by chemical exfoliation followed by wet impregnation. Reduced Fe 2 O 3 /GO could be employed as catalyst for synthesizing carbon nanotubes CNTs via catalytic chemical vapor deposition CCVD of n-hexane within a temperature range of 700-1000 °C. It was found that during the synthesis process, pretreatment affected the transformation of iron nanoparticles in the Fe 2 O 3 /GO, leading to significant difference in formation of carbon nanoparticles. When the Fe 2 O 3 /GO was employed within a temperature range of 700−900 °C, Fe 2 O 3 was reduced to α-Fe, yielding CNT growth on the graphene surface. However, the α-Fe could be transformed to γ-Fe when the Fe 2 O 3 /GO was subject to the temperature of 1000 °C, resulting in formation of carbon spheres instead of CNTs. After experimentally verified, conceptual scenarios of CNT/graphene hybrid material formation with respect to the pretreatment and synthesis temperature were proposed and discussed. [ABSTRACT FROM AUTHOR]