Effect of polymer combustion synthesis on thermal, spectroscopic, structural, and magnetic properties of Co3O4 nanoparticles

IF 2.6 3区化学 Q2 CHEMISTRY, INORGANIC & NUCLEAR Polyhedron Pub Date : 2025-03-01 Epub Date: 2025-01-25 DOI:10.1016/j.poly.2025.117419

Surekha S. Jogdand , Satyawati S. Joshi

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Abstract

We synthesized Co₃O₄ nanoparticles using polyethylene glycol by polymer combustion method. The pristine sample was annealed at 300, 500 and 800 °C. Fourier transform infrared spectroscopy (FTIR) was used to investigate the molecular mechanisms of degradation process in connection with thermal gravimetry (TG) and Differential Thermal Analysis (DTA). Raman studies indicate the shifting of all modes of Co₃O₄ towards the higher wave number indicating the interaction between Co₃O₄ nanoparticles and polymer matrix; supports the FTIR observation. Transmission Electron Microscopy (TEM) analysis show formation of single crystalline spinel phase. The magnetic properties are discussed in correlation with FTIR with respect to behavior of polymer. Highest coercivity of 214 G was observed for Co₃O₄ nanoparticles annealed at 300 °C from that of bulk Co₃O₄. The anomalous magnetic behavior observed in 300 °C annealed sample seems to be due to surface adsorption of OH groups and degradation of polyethylene glycol into hydroperoxide and conjugated double bond [CC]. The conjugated CC due to collective states of the π-electrons in the polymeric matrix may be involved in the magnetic behavior.

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聚合物燃烧合成对Co3O4纳米颗粒热、光谱、结构和磁性能的影响

以聚乙二醇为原料，采用聚合物燃烧法制备了纳米Co3O4。原始样品分别在300、500和800℃退火。利用傅里叶变换红外光谱（FTIR）结合热重（TG）和差热分析（DTA）研究了降解过程的分子机理。拉曼光谱研究表明，Co3O4的所有模式都向更高的波数移动，这表明Co3O4纳米颗粒与聚合物基质之间存在相互作用；支持FTIR观测。透射电镜（TEM）分析表明形成了单晶尖晶石相。讨论了磁性能与FTIR对聚合物行为的关系。在300℃退火后，纳米Co3O4的矫顽力达到了214g。在300°C退火样品中观察到的异常磁性行为似乎是由于OH基团的表面吸附和聚乙二醇降解成过氧化氢和共轭双键[CC]。聚合物基体中π电子的集体态引起的共轭CC可能与磁性行为有关。

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来源期刊

Polyhedron 化学-晶体学

CiteScore

4.90

自引率

7.70%

发文量

515

审稿时长

2 months

期刊介绍： Polyhedron publishes original, fundamental, experimental and theoretical work of the highest quality in all the major areas of inorganic chemistry. This includes synthetic chemistry, coordination chemistry, organometallic chemistry, bioinorganic chemistry, and solid-state and materials chemistry. Papers should be significant pieces of work, and all new compounds must be appropriately characterized. The inclusion of single-crystal X-ray structural data is strongly encouraged, but papers reporting only the X-ray structure determination of a single compound will usually not be considered. Papers on solid-state or materials chemistry will be expected to have a significant molecular chemistry component (such as the synthesis and characterization of the molecular precursors and/or a systematic study of the use of different precursors or reaction conditions) or demonstrate a cutting-edge application (for example inorganic materials for energy applications). Papers dealing only with stability constants are not considered.