本文選題：納米金屬氧化物 + 固體核磁共振�。� 參考：《南京大學(xué)》2015年碩士論文

【摘要】：近些年來,納米金屬氧化物在能源、催化、環(huán)境以及生物等領(lǐng)域的應(yīng)用中表現(xiàn)出了巨大的潛力。納米材料的表面結(jié)構(gòu)與其性能密切相關(guān),因此必須在原子、分子層次上掌握這些結(jié)構(gòu)信息。固體核磁共振是一種研究固體材料短程、中程有序的有力工具,具備能夠針對特定元素(原子核)進行分析,具有保留樣品的原有物相、可無損傷檢測,定量研究等特點。本論文以固體核磁共振方法為核心,輔以X射線衍射、透射電子顯微鏡、傅里葉變換紅外光譜、熱重、原子力顯微鏡和DFT理論計算等方法對二氧化錫和伽馬氧化鋁表面結(jié)構(gòu)進行了初步探究。得到以下結(jié)果：1.通過水熱方法制備了超薄的Sn02納米片。研究了水熱時間對產(chǎn)物的影響；不同溫度熱處理和羥基化Sn02納米片的119Sn MAS NMR的數(shù)據(jù)與DFT理論計算結(jié)果相結(jié)合,能夠區(qū)分Sn02納米片表面幾種不同的Sn物種,顯示借助固體核磁共振可以定量分析金屬氧化物表面原子的比例；2.在MgGa2O4表面借助原子層沉積了單層A1203。通過27Al1H MAS NMR與XRD相結(jié)合,研究了煅燒溫度對上述體系表面A1結(jié)構(gòu)的影響。隨著煅燒溫度的升高,同質(zhì)量Al2O3/MgGa2O4的27 Al MAS NMR信號強度逐漸減小,其原因可能是熱處理改變了不同化學(xué)環(huán)境A1的構(gòu)型對稱性,導(dǎo)致相應(yīng)四極耦合常數(shù)(CQ)變大使得譜峰展寬而難以觀測。
[Abstract]:In recent years, nanometallic oxides have shown great potential in the fields of energy, catalysis, environment and biology. The surface structure of nanomaterials is closely related to their properties, so it is necessary to master these structural information at the atomic and molecular levels. Solid nuclear magnetic resonance (SNMR) is a powerful tool for the study of short range and intermediate range order of solid materials. It can be used for the analysis of specific elements (atomic nuclei). It has the characteristics of preserving the original phase of the sample, no damage detection and quantitative research. In this paper, solid nuclear magnetic resonance (SNMR) method is the core, supplemented by X-ray diffraction, transmission electron microscope, Fourier transform infrared spectroscopy, thermogravimetry. The surface structures of tin dioxide and gamma alumina were investigated by atomic force microscope and DFT theory. Get the following result: 1. Ultrathin Sn02 nanoparticles were prepared by hydrothermal method. The influence of hydrothermal time on the product was studied, and the 119Sn MAS NMR data of Sn02 nanocrystals at different temperatures and hydroxylation were combined with the DFT theory to distinguish several different Sn species on the surface of Sn02 nanoparticles. It is shown that the ratio of metal oxide surface atoms can be quantitatively analyzed by solid nuclear magnetic resonance. Monolayer A1203 was deposited on MgGa2O4 surface by atomic layer. The effect of calcination temperature on the surface A1 structure of the system was studied by means of 27Al1H MAS NMR and XRD. With the increase of calcination temperature, the 27Al MAS NMR signal intensity of Al _ 2O _ 3 / MgGa _ 2O _ 4 of the same mass decreases gradually, which may be due to the heat treatment changing the symmetry of A1 configuration in different chemical environments. As a result, the corresponding quadrupole coupling constant (CQ) becomes larger and the spectral peaks are widened and difficult to observe.
【學(xué)位授予單位】：南京大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TQ134.32;TQ133.1;TB383.1

【共引文獻】

相關(guān)期刊論文 前10條

1 王宇;李玉國;方香;劉永峰;;SnO_2納米結(jié)構(gòu)的制備及發(fā)光特性[J];微納電子技術(shù);2013年11期

2 薛揚;袁桂梅;陳勝利;李淑娟;袁銳;;ZSM-5分子篩的磷改性及其碳四烯烴催化裂解性能[J];工業(yè)催化;2014年05期

3 顧建峰;袁忠勇;;磷改性雜原子B-ZSM-5分子篩催化劑結(jié)構(gòu)及其在液化氣芳構(gòu)化的應(yīng)用[J];工業(yè)催化;2011年10期

4 干慧媚;趙秀閣;宋寶寧;郭立;張然;陳晨;陳吉忠;朱聞聞;侯震山;;磷酸鋯催化甘油氣相脫水制備丙烯醛(英文)[J];催化學(xué)報;2014年07期

5 孔壯;李勇;鹿現(xiàn)永;朱英;江雷;;柔性透明自支撐氧化錫銻電紡納米纖維膜的制備與表征[J];高等學(xué)�；瘜W(xué)學(xué)報;2015年01期

6 胡耀池;章文貴;詹妮娜;胡q，

本文編號：1992093