{"title":"Local atomic structure and oxygen vacancy of NixFe(2-x)O catalyst for CNT growth","authors":"Jaekwang Lee, Heesoo Lee","doi":"10.1016/j.matlet.2025.138608","DOIUrl":null,"url":null,"abstract":"<div><div>The oxidation state and oxygen vacancy of Ni<sub>x</sub>Fe<sub>(2-x)</sub>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<sub>1.25</sub>Fe<sub>0.75</sub>O. 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<sub>x</sub>Fe<sub>(2-x)</sub>O, the I<sub>D</sub>/I<sub>G</sub> ratio of CNTs grown by the catalysts decreased by about 25% with the increase in surface oxygen vacancies.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"394 ","pages":"Article 138608"},"PeriodicalIF":2.7000,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Materials Letters","FirstCategoryId":"88","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0167577X25006378","RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"2025/4/19 0:00:00","PubModel":"Epub","JCR":"Q3","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
Abstract
The oxidation state and oxygen vacancy of NixFe(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 Ni1.25Fe0.75O. 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 NixFe(2-x)O, the ID/IG ratio of CNTs grown by the catalysts decreased by about 25% with the increase in surface oxygen vacancies.
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
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