Polarized Hole Injection-induced Magnetic Enhancement in Carbon-Encapsulated Cobalt Ferrite Nanoparticles
學年 112
學期 1
出版（發表）日期 2023-08-29
作品名稱 Polarized Hole Injection-induced Magnetic Enhancement in Carbon-Encapsulated Cobalt Ferrite Nanoparticles
作品名稱（其他語言）
著者 Jiann-Shing Lee, Shih-Min Hung, Chun-Rong Lin, Chi-Liang Chen, Jau-Wern Chiou, Chih-Yu Hua, Huang-Ming Tsai, Way-Faung Pong, Chien-Te Chen, Wen-Bin Wu, and Jiunn Chen
單位
出版者
著錄名稱、卷期、頁數 The Journal of Physical Chemistry C 127, 36, 17978–17986
摘要 Magnetic enhancement was observed in carbon-encapsulated cobalt ferrite (CoFe2O4) nanoparticles. The induced magnetic moment of the nanoparticles was estimated using a vibrating-sample magnetometer and corrected based on thermogravimetric loss. Notably, up to 25% magnetic enhancement was achieved via carbon encapsulation by low-temperature hydrothermal reactions. A systematic variation on Co L-edge absorption spectra revealed the introduction of valence holes owing to carbon encapsulation, and the hole injection was attributed to carbon–sp contact. X-ray magnetic circular dichroism indicates holes injected upon both Fe and Co ions. Specifically, it is observed that the injection of polarized holes into Co2+ ions at the octahedral site results in magnetic enhancement. A spin–split electronic structure analysis of CoFe2O4 based on density functional theory with Hubbard correction demonstrated that octahedral Co, which served as a minority hole reservoir, controlled the magnetic properties of the hybrid system.
關鍵字
語言 en_US
ISSN 1932-7455
期刊性質 國外
收錄於 SCI
產學合作
通訊作者
審稿制度 否
國別 USA
公開徵稿
出版型式 ,電子版
相關連結

機構典藏連結 ( http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/125496 )