Kundu Sani, Sarkar Toton, Ghorai Gurupada, Sahoo Pratap K, Al-Ahmadi Ahmad Aziz, Alghamdi Ahmad, Bhattacharjee Ashis
Department of Physics, Visva-Bharati University, Santiniketan 731235, India.
School of Physical Sciences, An OCC of Homi Bhabha National Institute, National Institute of Science Education and Research, Jatni, Odisha 752050, India.
ACS Omega. 2024 May 16;9(21):22607-22618. doi: 10.1021/acsomega.3c10332. eCollection 2024 May 28.
Recently, we have reported the influence of various reaction atmospheres on the solid-state reaction kinetics of ferrocene, where oxalic acid dihydrate was used as a coprecursor. In this light, present study discusses on the nature of decomposed materials of the solid-state reactions of ferrocene in O, air, and N atmospheres. The ambient and oxidative atmospheres caused the decomposition to yield pure hematite nanomaterials, whereas cementite nanomaterials along with α-Fe were obtained in N atmosphere. The obtained materials were mostly agglomerated. Elemental composition of each material was estimated. Using the absorbance data, the energy band gap values were estimated and the related electronic transitions from the observed absorption spectra were explored. Urbach energy was calculated for hematite, which described the role of defects in the decomposed materials. The nanostructures exhibited photoluminescence due to self-trapped states linked to their optical characteristics. Raman spectroscopy of hematite detected seven Raman modes, confirming the rhombohedral structure, whereas the D and G bands were visible in the Raman spectra for cementite. Thus, the reaction atmosphere significantly influenced the thermal decomposition of ferrocene and controls the type of nanomaterials obtained. Plausible reactions of the undergoing solid-state decomposition have been proposed.
最近，我们报道了各种反应气氛对二茂铁固态反应动力学的影响，其中使用二水合草酸作为共前驱体。鉴于此，本研究讨论了二茂铁在氧气、空气和氮气气氛中固态反应分解产物的性质。在环境气氛和氧化气氛中，分解产生了纯的赤铁矿纳米材料，而在氮气气氛中获得了渗碳体纳米材料以及α-Fe。所获得的材料大多发生了团聚。估计了每种材料的元素组成。利用吸光度数据估计了能带隙值，并探索了从观察到的吸收光谱中得出的相关电子跃迁。计算了赤铁矿的乌尔巴赫能量，它描述了分解材料中缺陷的作用。由于与它们的光学特性相关的自陷态，纳米结构表现出光致发光。赤铁矿的拉曼光谱检测到七种拉曼模式，证实了菱面体结构，而渗碳体的拉曼光谱中可见D带和G带。因此，反应气氛显著影响了二茂铁的热分解，并控制了所获得的纳米材料的类型。已经提出了正在进行的固态分解的可能反应。
