發(fā)布時間：2018-05-22 14:08

  本文選題：氧化鋅 + 碳基��； 參考：《沈陽工業(yè)大學(xué)》2017年碩士論文

【摘要】：本文采用溶劑熱法得到了金屬有機(jī)骨架化合物MOF-5,用其作為前驅(qū)物,在氮?dú)庀聼崽幚淼玫絑nO/C復(fù)合材料;采用溶劑熱法制備Fe~(3+)摻雜MOF-5,熱處理后成功得到ZnO/ZnFe_2O_4/C復(fù)合吸波材料。利用X射線衍射儀(XRD)、掃描電鏡(SEM)、傅里葉轉(zhuǎn)換紅外光譜分析儀(FTIR)、振動樣品磁強(qiáng)計(jì)(VSM)和矢量網(wǎng)絡(luò)分析儀(VNA)等對所制樣品的物相、微觀結(jié)構(gòu)、磁性及吸波性能進(jìn)行了分析。SEM圖像分析表明,所制備的ZnO/C材料粒徑大小約為25μm,是完全由片狀物堆疊起來的完整的立方體結(jié)構(gòu),薄片厚度約為20nm,且Zn、O、C各元素均勻分布。由FTIR圖譜分析可知,ZnO/C復(fù)合材料在6-8μm、23-24μm處有兩個紅外吸收峰,吸波率分別約為45%、65%左右;由微波吸收性能研究表明,最佳反射損耗在17.18GHz處時達(dá)-14.1dB,相對的應(yīng)厚度為7mm,其頻帶寬為16.8GHz-17.67GHz;此外,Fe~(3+)摻雜的MOF-5做為前驅(qū)物,對熱處理后得到的ZnO/ZnFe_2O_4/C復(fù)合吸波材料進(jìn)行檢測:SEM結(jié)果表明,ZnO/ZnFe_2O_4/C為的多孔中空蜂窩狀結(jié)構(gòu)的立方體形態(tài),粒徑約為25-30μm;由磁性能分析可知,在室溫條件下,ZnO/ZnFe_2O_4/C復(fù)合材料為順磁-超順磁性能,其飽和磁化強(qiáng)度約為8emu/g,剩余磁化強(qiáng)度(Mr)約為2emu/g,矯頑力(Hc)約為2.13KA/m;由紅外光譜圖分析得知,ZnO/ZnFe_2O_4/C復(fù)合材料在6-7μm、18-19μm、23-24μm處有三個很強(qiáng)的紅外吸收峰,吸波率分別為70%、83%、89%;由微波吸收性能研究表明,ZnO/ZnFe_2O_4/C復(fù)合材料在涂層厚度為7.5-7.9mm時均有對電磁波小于-10dB的衰減,所對應(yīng)的吸波頻帶是14.62-16.05GHz。最大反射率出現(xiàn)在14.5GHz處可達(dá)-13.98dB,對應(yīng)厚度為7.6mm。研究表明本文設(shè)計(jì)合成ZnO/C材料,其質(zhì)量輕、比表面積大,且多孔結(jié)構(gòu)造成多重散射,這些散射和電子極化、界面極化、馳豫作用均增加了材料對電磁波的吸收和衰減,增強(qiáng)了吸波性能。摻雜Fe~(3+)后得到的ZnO/ZnFe_2O_4/C復(fù)合吸波材料不僅具有ZnO/C材料多孔中空的孔道結(jié)構(gòu)特性而且還改善了電磁參數(shù),使其在微波吸收性能良好的基礎(chǔ)上拓寬吸收頻帶寬度以及進(jìn)一步提高了紅外吸收率。
[Abstract]:In this paper, a solvothermal method was used to obtain a metal organic skeleton compound MOF-5, which was used as a precursor to get ZnO/C composite under nitrogen heat treatment. Fe~ (3+) doped MOF-5 was prepared by solvent heat method. After heat treatment, the ZnO/ZnFe_2O_4/C composite absorbing material was successfully obtained. Using X ray diffractometer (XRD), scanning electron microscopy (SEM), Fourier transform red An external spectral analyzer (FTIR), a vibrating sample magnetometer (VSM) and a vector network analyzer (VNA) were used to analyze the phase, microstructure, magnetic properties and absorption properties of the samples. The analysis of.SEM images showed that the size of the prepared ZnO/C material was about 25 u m, and the complete cube structure and thin slice thickness were completely stacked by the sheet. The degree is about 20nm, and the elements of Zn, O and C are evenly distributed. From the FTIR map analysis, the ZnO/C composite has two infrared absorption peaks at 6-8 mu m and 23-24 mu m, and the absorption rate is about 45% and 65%, respectively. The optimum reflection loss is -14.1dB with the relative thickness of 16.8GHz-17, and the frequency bandwidth is 16.8GHz-17. In addition, Fe~ (3+) doped MOF-5 was used as a precursor to detect the ZnO/ZnFe_2O_4/C composite absorbing material obtained after heat treatment. The SEM results showed that the cubic shape of the porous hollow honeycomb structure of ZnO/ZnFe_2O_4/C was about 25-30 u m, and the magnetic properties showed that at room temperature, the ZnO/ZnFe_2O_4/C composite material was at room temperature. The paramagnetic and superparamagnetic properties are about 8emu/g, the residual magnetization (Mr) is about 2emu/g and the coercive force (Hc) is about 2.13KA/m. By the analysis of infrared spectra, there are three strong infrared absorption peaks of ZnO/ZnFe_2O_4/C composites at 6-7 mu m, 18-19 u m and 23-24 u m, and the absorption properties of microwave absorption are 70%, 83%, 89%, respectively. It is shown that the ZnO/ZnFe_2O_4/C composite has the attenuation of the electromagnetic wave less than -10dB when the coating thickness is 7.5-7.9mm. The corresponding absorption band is the maximum 14.62-16.05GHz. reflectivity at 14.5GHz to -13.98dB. The corresponding thickness of 7.6mm. study shows that the ZnO/ C material is designed and synthesized in this paper, which is light, larger than surface area and porous junction. It is constructed into multiple scattering. These scattering and electron polarization, interfacial polarization and relaxation increase the absorption and attenuation of the electromagnetic wave and enhance the absorption properties. The ZnO/ZnFe_2O_4/C composite absorbing material obtained after doping Fe~ (3+) not only has the pore structure characteristics of the porous hollow ZnO/C material but also improves the electromagnetic parameters, so that the electromagnetic parameters are also improved. On the basis of good microwave absorption properties, broadening the absorption band width and further improving the infrared absorption rate.
【學(xué)位授予單位】：沈陽工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TB34

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