分析化学(期刊)
等温过程
扫描电子显微镜
热分析
微波食品加热
材料科学
溶胶凝胶
惰性气体
试剂
热分解
傅里叶变换红外光谱
热重分析
铜
硅胶
热的
化学
化学工程
色谱法
复合材料
纳米技术
物理化学
热力学
有机化学
冶金
工程类
物理
量子力学
作者
Luminița Predoană,Irina Atkinson,Dániel Attila Karaj,Vincent Otieno Odhiambo,L. Bakoš,Teodóra Nagyné Kovács,Jeanina Pandele–Cușu,Simona Petrescu,Adriana Rusu,Imre Miklós Szilágyi,György Pokol,M. Zaharescu
标识
DOI:10.1007/s10973-019-09205-5
摘要
Abstract In the literature data, several papers reported the synthesis by various chemical or physical methods of the SrCu 2 O 2 (SCO) having possible applications in thermoelectric or completely electronic devices such as solar cells, liquid crystal displays and touch screen. A great challenge is represented by the formation of the pure SrCu 2 O 2 (SCO), due to the high labiality of the Cu valence, depending on temperature. In the present paper, the thermal behavior of Sr–Cu–O gels obtained by sol–gel (SG) or microwave (MW)-assisted SG methods was studied in order to establish the appropriate thermal conditions for pure nanostructured SrCu 2 O 2 preparation. As reagents, copper and strontium acetylacetonate in alcoholic media were used. The starting solutions were homogenized either by stirring for 2 h at room temperature or were exposed to MW for 5 min at 300 W and a frequency of 2.45 GHz. Both solutions were left to gel at room temperature. The obtained gels were investigated by scanning electron microscopy, Fourier-transform infrared spectroscopy, as well as by thermal analysis combined with evolved gas analysis (TG/DTA-MS) measurements in air, inert and reducing atmospheres. For both type of samples, a stepwise thermal decomposition of the gels was noticed in a large temperature range. In the case of samples obtained by microwave-assisted SG method, a higher number of thermal effects were registered assigned to a higher number of molecular species formed in the sample. The residues obtained by non-isothermal treatment up to 900 °C, of both type of samples, were investigated by X-ray diffraction. The results demonstrate the influence of the MW on the SG synthesis and on the thermal properties of the resulted gels. Based on the obtained results, the required thermal treatment of the gels in order to obtain convenient precursors powders for obtaining pure SrCu 2 O 2 could be proposed.
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