博文
硫醇杂化的ZnO纳米管/纳米线：可调节的界面磁性质
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Thiol-Capped ZnO Nanowire/Nanotube Arrays with Tunable Magnetic Properties at Room Temperature
Author: Deng, Su-Zi, Fan, Hai-Ming,* Wang, Miao, Zheng, Min-Rui, Yi, Jia-Bao, Wu, Rong-Qin, Tan, Hui-Ru, Sow, Chorng-Haur, Ding, Jun, Feng, Yuan-Ping, Loh, Kian-Ping*
ACS NANO Volume: 4 Issue: 1 Pages: 495-505
Abstract:
The present study reports room-temperature ferromagnetic behaviors in three-dimensional (3D)-aligned thiol-capped single-crystalline ZnO nanowire (NW) and nanotube (NT) arrays as well as polycrystalline ZnO NT arrays. Besides the observation of height-dependent saturation magnetization, a much higher M-s of 166 mu emu cm(-2) has been found in NTs compared to NWs (36 mu emu cm(-2)) due to larger surface area in ZnO NTs, indicating morphology-dependent magnetic properties in ZnO NW/NT systems. Density functional calculations have revealed that the origin of ferromagnetism is mainly attributed to spin-polarized 3p electrons in S sites and, therefore, has a strong correlation with Zn-S bond anisotropy. The preferential magnetization-direction of both single-crystalline NTs and NWs lies perpendicular to the tube/wire axis due to the aligned high anisotropy orientation of the Zn-S bonds on the lateral (100) face of ZnO NWs and NTs. Polycrystalline ZnO NTs, however, exhibit a preferential magnetization direction parallel to the tube axis which is ascribed to shape anisotropy dominating the magnetic response. Our results demonstrate the interplay of morphology, dimensions, and crystallinity on spin alignment and magnetic anisotropy in a 3D semiconductor nanosystem with interfacial magnetism.
简评： 通过控制ZnO纳米线的尺寸和晶体结构，从而有可能调制界面磁学性质。
https://m.sciencenet.cn/blog-348897-310159.html
上一篇：磁性尖晶石铁酸盐纳米管和纳米环的合成及生物学应用
下一篇：Zn空位导致的铁磁行为：锂掺杂ZnO
Author: Deng, Su-Zi, Fan, Hai-Ming,* Wang, Miao, Zheng, Min-Rui, Yi, Jia-Bao, Wu, Rong-Qin, Tan, Hui-Ru, Sow, Chorng-Haur, Ding, Jun, Feng, Yuan-Ping, Loh, Kian-Ping*
ACS NANO Volume: 4 Issue: 1 Pages: 495-505
Abstract:
The present study reports room-temperature ferromagnetic behaviors in three-dimensional (3D)-aligned thiol-capped single-crystalline ZnO nanowire (NW) and nanotube (NT) arrays as well as polycrystalline ZnO NT arrays. Besides the observation of height-dependent saturation magnetization, a much higher M-s of 166 mu emu cm(-2) has been found in NTs compared to NWs (36 mu emu cm(-2)) due to larger surface area in ZnO NTs, indicating morphology-dependent magnetic properties in ZnO NW/NT systems. Density functional calculations have revealed that the origin of ferromagnetism is mainly attributed to spin-polarized 3p electrons in S sites and, therefore, has a strong correlation with Zn-S bond anisotropy. The preferential magnetization-direction of both single-crystalline NTs and NWs lies perpendicular to the tube/wire axis due to the aligned high anisotropy orientation of the Zn-S bonds on the lateral (100) face of ZnO NWs and NTs. Polycrystalline ZnO NTs, however, exhibit a preferential magnetization direction parallel to the tube axis which is ascribed to shape anisotropy dominating the magnetic response. Our results demonstrate the interplay of morphology, dimensions, and crystallinity on spin alignment and magnetic anisotropy in a 3D semiconductor nanosystem with interfacial magnetism.
简评： 通过控制ZnO纳米线的尺寸和晶体结构，从而有可能调制界面磁学性质。
https://m.sciencenet.cn/blog-348897-310159.html
上一篇：磁性尖晶石铁酸盐纳米管和纳米环的合成及生物学应用
下一篇：Zn空位导致的铁磁行为：锂掺杂ZnO
