發(fā)布時間：2018-04-14 02:05

  本文選題：近紅外量子點(diǎn) + 低溫水相合成　； 參考：《桂林理工大學(xué)》2017年碩士論文

【摘要】：近紅外量子點(diǎn)以其不同于傳統(tǒng)熒光染料的優(yōu)異的光學(xué)性質(zhì),使其在太陽能電池、化學(xué)分析、藥物殘留檢測、光催化、LED等領(lǐng)域等方面得到廣泛的應(yīng)用。水相合成法具有操作簡單、生物相容性好等優(yōu)點(diǎn)。本文主要在常溫下利用水相法一步合成了低毒的近紅外熒光量子點(diǎn),并在此基礎(chǔ)上重點(diǎn)探究了Ag_2S、Ag_2Se量子點(diǎn)作為熒光探針在分析領(lǐng)域和生物領(lǐng)域(金屬離子和抗生素檢測)方面的具體應(yīng)用。論文主要內(nèi)容如下:(1)采用常溫水相制備了近紅外發(fā)光的Ag_2S、Ag_2Se量子點(diǎn)(QDs)。同時研究了原料的摩爾比、pH值、表面活性劑、溫度、反應(yīng)時間等因素對Ag_2S、Ag_2Se量子點(diǎn)熒光性質(zhì)以及光學(xué)穩(wěn)定性的影響,并利用X射線粉末衍射、透射電鏡、熒光光譜儀和紫外可見吸收光譜等儀器對量子點(diǎn)的形貌,結(jié)構(gòu),價態(tài)等進(jìn)行了表征。研究表明:當(dāng)表面修飾劑為N-乙�；�-L-半胱氨酸,溶液體系pH值為4.2-4.4時,N-乙酰基-L-半胱氨酸/Ag~+的摩爾比為6/5,Ag~+/X(X=S、Se)的摩爾比分別為5/1、20/3時,制備的水溶性近紅外發(fā)光的NAC-Ag_2S/Ag_2Se QDs熒光性能最好。在研究Ag_2S、Ag_2Se QDs的穩(wěn)定性的過程中發(fā)現(xiàn),在常溫保存的條件下Ag_2S、Ag_2Se QD的熒光強(qiáng)度在80天內(nèi)基本保持不變;Ag_2S、Ag_2SeQDs的熒光強(qiáng)度在氙燈照射480min后仍基本保持不變。(2)將Ag_2S、Ag_2Se作為熒光探針,基于熒光猝滅機(jī)理分別用來檢測溶液中的Cu2+、Hg~(2+)、Ag~+濃度。研究表明,Ag_2S、Ag_2SeQDs的熒光特征峰強(qiáng)度變化與三者金屬離子濃度之間呈現(xiàn)良好的線性關(guān)系。(3)利用Ag_2S、Ag_2Se QDs作為熒光探針定量檢測硫酸鏈霉素發(fā)現(xiàn),硫酸鏈霉素能在一定程度上增強(qiáng)Ag_2S、Ag_2Se QDs的熒光強(qiáng)度,Ag_2S QDs的相對熒光增強(qiáng)程度I與2.5×10~(-7)~17.5×10~(-7)mol/L范圍內(nèi)的硫酸鏈霉素呈現(xiàn)出良好的線性關(guān)系,擬合后線性方程:I=0.009+1.032C,線性相關(guān)系數(shù)R=0.9971,Ag_2S QDs對硫酸鏈霉素的最低檢測限為1.99×10~(-7)mol/L。Ag_2Se量子點(diǎn)與硫酸鏈霉素在5×10~(-7)~15×10~(-7)mol/L范圍內(nèi)呈線性關(guān)系,擬合后線性方程:I=0.791+0.064C,線性相關(guān)系數(shù)R=0.9979,Ag_2Se QDs對硫酸鏈霉素的最低檢測限為2.3×10~(-7)mol/L。
[Abstract]:Near-infrared quantum dots (NIR QDs) have been widely used in solar cells, chemical analysis, drug residue detection, photocatalytic LED and other fields due to their excellent optical properties, which are different from traditional fluorescent dyes.Water phase synthesis has the advantages of simple operation and good biocompatibility.In this paper, low toxic near infrared fluorescence quantum dots were synthesized by using aqueous phase method at room temperature.On the basis of this, the specific applications of AgS _ 2S _ e quantum dots as fluorescent probes in the field of analysis and biology (metal ions and antibiotic detection) are emphatically explored.The main contents of this paper are as follows: (1) the near infrared luminescent Ag _ 2S _ I _ (Ag _ 2Se) quantum dots QDsN have been prepared by using water phase at room temperature.At the same time, the effects of the molar ratio of raw materials, such as pH value, surfactant, temperature, reaction time and so on, on the fluorescence properties and optical stability of Ag2S- Ag-2Se quantum dots were studied, and X-ray powder diffraction and transmission electron microscopy were used to study the fluorescence properties and optical stability of Ag2Se quantum dots.The morphology, structure and valence state of quantum dots were characterized by fluorescence spectrometer and UV-Vis absorption spectroscopy.The results show that when the surface modifier is N-acetyl-L-cysteine and the pH value of the solution is 4.2-4.4, the molar ratio of N-acetyl-L-cysteine to cysteine / Ag- is 6 / 5 / 5G ~ / X ~ (X) -X ~ (-) S _ (See) = 5 / 1 / 20 / 3, respectively, when the molar ratio of N-acetyl-L-cysteine to cysteine is 6 / 5 / 5.The water soluble near infrared luminescent NAC-Ag_2S/Ag_2Se QDs has the best fluorescence properties.In the course of studying the stability of Ag2SX AgSe QDs, it was found that the fluorescence intensity of Ag2Sn Ag2SE QD remained basically the same for 80 days under normal temperature preservation. The fluorescence intensity of Ag2SU Ag2SeQDs remained basically unchanged after Xenon lamp irradiating 480min.) Ag2Sv / Ag2Se was used as fluorescence probe.The fluorescence quenching mechanism was used to detect the concentration of Cu2 in solution.The results show that there is a good linear relationship between the peak intensity of fluorescence characteristic and the concentration of metal ions in Ag2SX / Ag2SeQDs.) the quantitative detection of streptomycin sulfate by Ag2SX Ag2Se QDs as a fluorescence probe is carried out.Streptomycin sulfate can enhance the fluorescence intensity of Ag2Se QDs to some extent. The relative fluorescence enhancement degree I of Ag2Se QDs shows a good linear relationship with that of streptomycin sulfate in the range of 2.5 脳 10 ~ (-7) 10~(-7)mol/L.The linear equation: I = 0.009 1.032C, the linear correlation coefficient R = 0.9971AgSs QDs is 1.99 脳 10~(-7)mol/L.Ag_2Se quantum dot and streptomycin sulfate has a linear relationship with streptomycin sulfate in the range of 5 脳 10 ~ (-7) 10~(-7)mol/L.The linear equation: I = 0.791 0.064C, and the linear correlation coefficient RV 0.9979 AgSe QDs for streptomycin sulfate is 2.3 脳 10 ~ (-1) ~ (-7) mol 路L ~ (-1) 路L ~ (-1) 路min ~ (-1) ~ (-1) 路L ~ (-1) 路L ~ (-1).
【學(xué)位授予單位】：桂林理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：O657.3

【參考文獻(xiàn)】

相關(guān)期刊論文 前7條

1 黃碧妃;黃風(fēng)華;程陳;孫聰;;檸檬酸鹽穩(wěn)定的水溶性CdSe量子點(diǎn)的合成及表征[J];化學(xué)研究;2013年01期

2 張文龍;張俊生;周麗平;陳莉華;;牛血清白蛋白修飾水溶性CdTe量子點(diǎn)及分析應(yīng)用[J];吉首大學(xué)學(xué)報(自然科學(xué)版);2011年01期

3 ;Ultrafast Microwave-hydrothermal Synthesis of CdTe Nanocrystal and Its Application to Fingerprint Detection[J];Chemical Research in Chinese Universities;2010年06期

4 李眾;祝欣;董朝青;黃香宜;陳虹錦;任吉存;;熒光量子點(diǎn)的水相合成及其在化學(xué)和生物分析中的應(yīng)用[J];高等學(xué)校化學(xué)學(xué)報;2010年10期

5 鄧大偉;于俊生;;檸檬酸穩(wěn)定的水溶性CdSe和CdSe/CdS量子點(diǎn)的熒光特性[J];無機(jī)化學(xué)學(xué)報;2008年05期

6 唐愛偉,滕楓,王元敏,周慶成,王永生;II-VI族半導(dǎo)體量子點(diǎn)的發(fā)光特性及其應(yīng)用研究進(jìn)展[J];液晶與顯示;2005年04期

7 關(guān)柏鷗,張桂蘭,湯國慶,韓關(guān)云;半導(dǎo)體納米材料的光學(xué)性能及研究進(jìn)展[J];光電子·激光;1998年03期

相關(guān)碩士學(xué)位論文 前4條

1 彭莎莎;基于量子點(diǎn)和過硫酸鹽的電化學(xué)發(fā)光免疫傳感器[D];山東大學(xué);2013年

2 吳靜;水溶性CdTe量子點(diǎn)在藥物分析及金屬離子檢測中的應(yīng)用研究[D];鄭州大學(xué);2013年

3 趙艷;量子點(diǎn)熒光探針在藥物及金屬離子分析中的應(yīng)用[D];延安大學(xué);2012年

4 趙守苗;水溶性CdS量子點(diǎn)的制備及應(yīng)用研究[D];山西師范大學(xué);2010年

，

本文編號：1747211