碳纳米管生长用NixFe(2-x)O催化剂的局部原子结构和氧空位

IF 2.7 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Letters Pub Date : 2025-04-19 DOI:10.1016/j.matlet.2025.138608

Jaekwang Lee, Heesoo Lee

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引用次数: 0

摘要

研究了NixFe(2-x)O催化剂的氧化态和氧空位，以及其生长的碳纳米管（CNTs）的结构性质。Fe的加入使NiO的衍射峰向低角度偏移并展宽。随着Fe含量的增加，Ni的氧化态逐渐降低，并且在Ni1.25Fe0.75O中形成的氧空位最多。由于Fe和Ni的价态差异促进了氧空位的形成，导致Ni- o的成键长度减小。对于NixFe(2-x)O生长的CNTs的结构性质，随着表面氧空位的增加，催化剂生长的CNTs的ID/IG比降低了约25%。

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Local atomic structure and oxygen vacancy of NixFe(2-x)O catalyst for CNT growth

The oxidation state and oxygen vacancy of Ni_xFe_(2-x)O catalysts were studied along with the structural properties of carbon nanotubes (CNTs) grown by the catalysts. The diffraction peaks of NiO were shifted to lower angles and broadened with the addition of Fe. The oxidation state of Ni decreased with Fe contents, and the oxygen vacancy was confirmed to be the most formed in Ni_1.25Fe_0.75O. As the formation of oxygen vacancies was promoted by the difference in valence states of Fe and Ni, the bonding length of Ni-O was decreased. For Structural properties of CNTs grown by Ni_xFe_(2-x)O, the I_D/I_G ratio of CNTs grown by the catalysts decreased by about 25% with the increase in surface oxygen vacancies.

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来源期刊

Materials Letters 工程技术-材料科学：综合

CiteScore

5.60

自引率

3.30%

发文量

1948

审稿时长

50 days

期刊介绍： Materials Letters has an open access mirror journal Materials Letters: X, sharing the same aims and scope, editorial team, submission system and rigorous peer review. Materials Letters is dedicated to publishing novel, cutting edge reports of broad interest to the materials community. The journal provides a forum for materials scientists and engineers, physicists, and chemists to rapidly communicate on the most important topics in the field of materials. Contributions include, but are not limited to, a variety of topics such as: • Materials - Metals and alloys, amorphous solids, ceramics, composites, polymers, semiconductors • Applications - Structural, opto-electronic, magnetic, medical, MEMS, sensors, smart • Characterization - Analytical, microscopy, scanning probes, nanoscopic, optical, electrical, magnetic, acoustic, spectroscopic, diffraction • Novel Materials - Micro and nanostructures (nanowires, nanotubes, nanoparticles), nanocomposites, thin films, superlattices, quantum dots. • Processing - Crystal growth, thin film processing, sol-gel processing, mechanical processing, assembly, nanocrystalline processing. • Properties - Mechanical, magnetic, optical, electrical, ferroelectric, thermal, interfacial, transport, thermodynamic • Synthesis - Quenching, solid state, solidification, solution synthesis, vapor deposition, high pressure, explosive