本文選題：熒光二硫化鉬納米片 + 化學計量學　； 參考：《南昌大學》2017年碩士論文

【摘要】：本文以鉬酸鈉和硫脲為原材料輔以水熱法制備熒光二硫化鉬納米片,把熒光二硫化鉬納米片作為熒光探針或納米酶,并結合光譜法和化學計量學,對環(huán)境中常見的離子(Pb~(2+)、S2-和Fe~(2+))進行分析檢測。文中所提出的方法綠色環(huán)保,操作簡單,選擇性好,靈敏度高,且快速,能運用到實際樣品中。本論文的主要內容如下:第一章:闡述了二維納米材料過渡金屬硫屬化物—二硫化鉬納米片的制備方法,物理化學性質以及在分析檢測中的應用研究;簡單的描述了檢測對象以及創(chuàng)新點;展望了熒光二硫化鉬納米片在其它領域中的發(fā)展前景。第二章:以鉬酸鈉和硫脲為原材料輔以水熱法制備熒光二硫化鉬納米片,采用透射電子顯微鏡,X-射線能譜,X-射線衍射,掃描電子顯微鏡,紫外-可見光譜和紅外光譜等表征手段對其形貌結構和化學性質進行分析。熒光二硫化鉬納米片最佳激發(fā)和發(fā)射波長分別為250 nm和405 nm,當Pb~(2+)加入熒光二硫化鉬納米片中能誘導熒光增強,隨后加入S2-熒光猝滅,以此構建“turn on-off”熒光傳感器來對Pb~(2+)和S2-進行檢測。第三章:以上合成的二硫化鉬納米片被證明具有類過氧化物酶的催化活性,在有過氧化氫的條件下能夠催化氧化鄰苯二胺生成黃色產物2,3-二氨基吩嗪。進一步加入Fe~(2+)到納米片中,能夠顯著地增強二硫化鉬納米片的類過氧化物酶的催化活性,據(jù)此原理構建出一種無標記比色納米酶傳感器,實現(xiàn)對Fe~(2+)的靈敏檢測。同時采用多元曲線分辨-交替最小二乘(MCR-ALS)對反應過程中的動力學光譜數(shù)據(jù)進行解析,發(fā)現(xiàn)Fe~(2+)增強二硫化鉬納米片的類過氧化物酶的催化活性的原因是使其反應速率常數(shù)增大。第四章:以上二硫化鉬納米片催化過氧化氫氧化鄰苯二胺產生的黃色產物2,3-二氨基吩嗪同時具有很強的熒光,基于產物的熒光性質,構建了熒光檢測Fe~(2+)的傳感器。同時采用一種化學計量學“二階校正”方法—平行因子分析法(PARAFAC)來消除實際湖水樣中的背景干擾,從而實現(xiàn)在未知背景干擾物質的存在下對湖水中的Fe~(2+)的檢測。本文研究的創(chuàng)新點主要有:(1)合成熒光二硫化鉬納米片,構建幾種光學傳感器實現(xiàn)對環(huán)境中幾種離子的檢測,并且具有良好的選擇性和靈敏度;(2)將化學計量學工具應用到熒光二硫化鉬納米片傳感器中,解釋傳感器響應過程中的可能機理問題以及增加傳感器在實際樣品中應用的性能。
[Abstract]:In this paper, we use sodium molybdate and thiourea as raw materials to prepare molybdenum disulfide nanoscale with hydrothermal method, and take the fluorescent nano disulfide nanosulfide as a fluorescent probe or nanoscale, and combine the spectrometric method and chemometrics to analyze the common ions (Pb~ (2+), S2- and Fe~ (2+)) in the environment. The method proposed in this paper is green and operation. The main contents of this paper are as follows: first chapter: the preparation method, the physical and chemical properties and the application of the molybdenum disulfide nanosulfide nanomaterials are described in the first chapter. The second chapter: using sodium molybdate and thiourea as raw materials to prepare molybdenum disulfide nanosulfide by hydrothermal method and using transmission electron microscope, X- ray energy spectrum, X- ray diffraction, scanning electron microscope, ultraviolet visible spectrum and infrared spectrum. The optimum excitation and emission wavelengths of the phosphor disulfide nanometers are 250 nm and 405 nm respectively. When Pb~ (2+) is added to the fluorescent nano disulfide nanoscale, the fluorescence enhancement can be induced, and then S2- fluorescence quenching is added to construct the "turn on-off" fluorescence sensor to detect Pb~ (2+) and S2-. The third chapter: the above synthesized molybdenum disulfide nanosulfide has been proved to have the catalytic activity of the peroxidase, and can catalyze the oxidation of phthalamine to produce the yellow product 2,3- two amino phenazine under the condition of hydrogen peroxide. Further addition of Fe~ (2+) to the nanoscale can significantly enhance the peroxidase of molybdenum disulfide nanoscale. On the basis of the catalytic activity, a colorless nano enzyme sensor was constructed to detect the Fe~ (2+) sensitively. At the same time, the kinetic spectral data of the reaction process were analyzed by multivariate curve resolution alternating least squares (MCR-ALS), and the catalytic activity of Fe~ (2+) enhanced molybdenum disulfide like peroxidase was found. The reason is that the rate constant of the reaction is increased. The fourth chapter: the yellow product of 2,3- two amino phenazine produced by the oxidation of o-phthalamine by the molybdenum disulfide nanoscale has very strong fluorescence. Based on the fluorescence properties of the product, a sensor for fluorescence detection of Fe~ (2+) is constructed. At the same time, a chemometrics "two order correction" is used. "Method parallel factor analysis (PARAFAC) method (PARAFAC) is used to eliminate the background interference in the actual lake water, so as to realize the detection of Fe~ (2+) in the lake water under the presence of unknown background interferences. The main innovations of this paper are as follows: (1) synthesis of fluorosulfide nanosulfide nanoscale and several optical sensors to realize several ions in the environment Detection, and has good selectivity and sensitivity; (2) the chemometrics tool is applied to the fluorescence sensor of molybdenum disulfide nanoscale, to explain the possible mechanism problems in the response process of the sensor and to increase the performance of the sensor in the actual sample.
【學位授予單位】：南昌大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：X830;O657.3;TB383.1

【參考文獻】

相關期刊論文 前1條

1 Xin Tong;Eric Ashalley;Feng Lin;Handong Li;Zhiming M.Wang;;Advances in MoS_2-Based Field Effect Transistors(FETs)[J];Nano-Micro Letters;2015年03期

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本文編號：2022936