Synthesis, Characterization and Gas Sensing Properties of Ag@α-Fe2O3 Core–Shell Nanocomposites

Nanomaterials

Ali Mirzaei¹  Kamal Janghorban¹  Babak Hashemi¹  Anna Bonavita²  Maryam Bonyani¹  Salvatore Gianluca Leonardi²  Giovanni Neri² 

[1] Department of Materials Science and Engineering, Shiraz University, 71946-85115 Shiraz, Iran; E-Mails:;Department of Electronic Engineering, Chemistry and Industrial Engineering, University of Messina, C.da di Dio, 98166 Messina, Italy; E-Mails:

关键词: Ag@α-Fe₂O₃;    core–shell;    nanocomposite;    synthesis;    gas sensor;    ethanol;   

DOI  :  10.3390/nano5020737

来源: mdpi

【 摘 要 】

Ag@α-Fe₂O₃ nanocomposite having a core–shell structure was synthesized by a two-step reduction-sol gel approach, including Ag nanoparticles synthesis by sodium borohydride as the reducing agent in a first step and the subsequent mixing with a Fe⁺³ sol for α-Fe₂O₃ coating. The synthesized Ag@α-Fe₂O₃ nanocomposite has been characterized by various techniques, such as SEM, TEM and UV-Vis spectroscopy. The electrical and gas sensing properties of the synthesized composite towards low concentrations of ethanol have been evaluated. The Ag@α-Fe₂O₃ nanocomposite showed better sensing characteristics than the pure α-Fe₂O₃. The peculiar hierarchical nano-architecture and the chemical and electronic sensitization effect of Ag nanoparticles in Ag@α-Fe₂O₃ sensors were postulated to play a key role in modulating gas-sensing properties in comparison to pristine α-Fe₂O₃ sensors.

【 授权许可】

CC BY   
© 2015 by the authors; licensee MDPI, Basel, Switzerland.