NIMTE OpenIR  > 2018专题
Facile synthesis of a cationic-doped [Ca24Al28O64](4+)(4e(-)) composite via a rapid citrate sol-gel method
Khan, Karim; Tareen, Ayesha Khan; Elshahat, Sayed; Yadav, Ashish; Khan, Usman; Yang, Minghui; Bibbo, Luigi; Ouyang, Zhengbiao
2018
Source PublicationDALTON TRANSACTIONS
Volume47Issue:11Pages:3819-3830
AbstractOne of the greatest challenges in the enhancement of the electrical properties of conductive mayenite [Ca24Al28O64](4+)(4e(-)) (hereinafter C12A7:e(-)) is the design of a more suitable/simple synthesis strategy that can be employed to obtain the required properties such as excellent stable electrical conductivity, a high electron concentration, outstanding mobility, and an exceptionally large surface area. Therefore, to synthesize C12A7:e(-) in the metallic state, we proposed a facile, direct synthesis strategy based on an optimized sol-gel combustion method under a nitrogen gas environment using the low-cost precursors Ca(NO3)(2)4H(2)O and Al(NO3)(3)9H(2)O. Using this developed strategy, we successfully synthesized moderately conductive nanoscale C12A7:e(-) powder, but with unexpected carbon components (reduced graphene oxide (rGO) and/or graphene oxide (GO)). The synthesized C12A7:e(-) composite at room temperature has an electrical conductivity of about 21 S cm(-1), a high electron concentration of approximately 1.5 x 10(21) cm(-3), and a maximum specific surface area of 265 m(2) g(-1). Probably, the synthesized rGO was coated on nanocage C12A7:e(-) particles. In general, the C12A7:e(-) electride is sensitive to the environment (especially to oxygen and moisture) and protected by an rGO coating on C12A7:e(-) particles, which also enhances the mobility and keeps the conductivity of C12A7:e(-) electride stable over a long period. Doped mayenite electride exhibits a conductivity that is strongly dependent on the substitution level. The conductivity of gallium-doped mayenite electride increases with the doping level and has a maximum value of 270 S cm(-1), which for the first time has been reported for the stable C12A7:e(-) electride. In the case of Si-substituted calcium aluminate, the conductivity has a maximum value of 222 S cm(-1) at room temperature.
KeywordTemperature Stable Electride Room-temperature Surface-area Mayenite Oxide 12cao-center-dot-7al(2)o(3) Conductivity Fabrication Anions Superconductivity
Subject AreaChemistry
Language英语
Document Type期刊论文
Identifierhttp://ir.nimte.ac.cn/handle/174433/16751
Collection2018专题
Recommended Citation
GB/T 7714
Khan, Karim,Tareen, Ayesha Khan,Elshahat, Sayed,et al. Facile synthesis of a cationic-doped [Ca24Al28O64](4+)(4e(-)) composite via a rapid citrate sol-gel method[J]. DALTON TRANSACTIONS,2018,47(11):3819-3830.
APA Khan, Karim.,Tareen, Ayesha Khan.,Elshahat, Sayed.,Yadav, Ashish.,Khan, Usman.,...&Ouyang, Zhengbiao.(2018).Facile synthesis of a cationic-doped [Ca24Al28O64](4+)(4e(-)) composite via a rapid citrate sol-gel method.DALTON TRANSACTIONS,47(11),3819-3830.
MLA Khan, Karim,et al."Facile synthesis of a cationic-doped [Ca24Al28O64](4+)(4e(-)) composite via a rapid citrate sol-gel method".DALTON TRANSACTIONS 47.11(2018):3819-3830.
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