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题名: Tuning of redox properties of iron and iron oxides via encapsulation within carbon nanotubes
作者: Chen, Wei;  Pan, Xiulian;  Bao, Xinhe
通讯作者: 包信和
刊名: JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
发表日期: 2007-06-13
DOI: 10.1021/ja0713072
卷: 129, 期:23, 页:7421-7426
收录类别: SCI
文章类型: Article
部门归属: 5
项目归属: 502
产权排名: 1;1
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Chemistry, Multidisciplinary
研究领域[WOS]: Chemistry
英文摘要: We report the tuning of the redox properties of iron and iron oxide nanoparticles by encapsulation within carbon nanotubes (CNTs) with varying inner diameters. Raman spectroscopy was employed to investigate the interaction of the encapsulated nanoparticles with the CNTs. A red shift of the Fe-O mode is observed in the nanoparticles deposited on the outer CNT surfaces with respect to bulk Fe2O3. However, this mode is found to be stepwise blue-shifted with decreasing inner diameter in the CNT-encapsulated Fe2O3 nanoparticles, suggesting an enhanced interaction of Fe2O3 with the inner CNT surface as its curvature increases. The autoreduction of the encapsulated Fe2O3 is significantly facilitated inside CNTs with respect to the outside nanoparticles. Interestingly, it becomes more facile with decreasing CNT channel diameter as evidenced by temperature programmed reaction, in situ XRD, and Raman spectroscopy. The oxidation of encapsulated metallic Fe nanoparticles on the other hand is retarded in comparison to that of the outside Fe particles as shown by in situ XRD and gravimetrical measurements with an online microbalance. We attribute this tunable redox behavior of transition metal nanoparticles inside CNTs to a particular electronic interaction of the encapsulates with the interior CNT surface, which stabilizes the metallic state of Fe.
关键词[WOS]: RAMAN-SPECTROSCOPY ;  CHEMISTRY ;  SPECTRA ;  OXYGEN ;  HYDROGENATION ;  NANOPARTICLES ;  MOLECULES ;  CATALYSIS ;  OXIDATION ;  HEMATITE
语种: 英语
原文出处: 查看原文
WOS记录号: WOS:000247072300052
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/99229
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catal, Dalian 116023, Peoples R China

Recommended Citation:
Chen, Wei,Pan, Xiulian,Bao, Xinhe. Tuning of redox properties of iron and iron oxides via encapsulation within carbon nanotubes[J]. JOURNAL OF THE AMERICAN CHEMICAL SOCIETY,2007,129(23):7421-7426.
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