本文選題：微波反應(yīng)器 + 碳量子點�。� 參考：《青島科技大學(xué)》2017年碩士論文

【摘要】：碳量子點是一種無毒的高效熒光的納米材料,因其制備過程簡單,水溶性較好、易于功能化等優(yōu)點,已經(jīng)廣泛應(yīng)用于生物醫(yī)藥、生物成像、光電傳感器和光催化劑等領(lǐng)域。本文通過普通微波反應(yīng)器和單模微波反應(yīng)器以L-胱氨酸為原料制備熒光強(qiáng)度高、穩(wěn)定性好的碳量子點。實驗中研究了多種因素對于碳量子點熒光性質(zhì)的影響,并將其作為一種熒光材料染色棉纖維、摻雜硅橡膠、制作隱形熒光墨水以及檢測金屬離子。主要研究結(jié)論如下:(1)利用單模微波反應(yīng)器制備的熒光碳量子點在水溶液中分散性好,外貌近乎球形,顆粒的尺寸大小不均勻,平均尺寸2-6 nm。碳量子點的水溶液在日光燈下呈現(xiàn)淡黃色,在365 nm紫外燈下呈現(xiàn)綠色熒光,最佳熒光激發(fā)波長420 nm,最大熒光發(fā)射波長505 nm,熒光量子產(chǎn)率為24%。萃取到有機(jī)相中的碳量子點在日光燈下為無色、紫外燈下發(fā)出藍(lán)色熒光,最佳熒光激發(fā)波長為365 nm,最大熒光發(fā)射波長變?yōu)?30 nm,在氯仿和二氯甲烷中的平均熒光量子產(chǎn)率為86%。無論水相還是有機(jī)相,最大發(fā)射波長位置不隨激發(fā)波長的改變而變化。(2)水相中的碳點可以在4 oC冰箱中長期保存,有機(jī)相中的碳點可以在室溫下長期保存。實驗制備的碳量子點的熒光強(qiáng)度隨著反應(yīng)時間的延長和氫氧化鈉濃度的提高均出現(xiàn)先增強(qiáng)后減弱的趨勢。當(dāng)胱氨酸的濃度為10%時,最佳反應(yīng)溫度為135-140°C,氫氧化鈉在反應(yīng)體系中的濃度為0.7-0.9 mol/L。水相碳量子點在很寬的pH范圍內(nèi)都具有熒光性質(zhì),且熒光強(qiáng)度隨著pH的升高而變?nèi)酢?3)實驗中制備碳量子點作為熒光材料能夠染色脫脂棉、也能夠摻雜硅橡膠,并可以制作熒光墨水。研究發(fā)現(xiàn),使用水相中的碳量子點染色棉纖維的熒光不夠牢固,而氯仿相中碳量子點染色的棉纖維熒光更牢固;使用水相碳量子點摻雜的硅橡膠呈現(xiàn)淡黃色,不透明,紫外燈下呈現(xiàn)強(qiáng)的藍(lán)綠色熒光,使用有機(jī)相碳量子點摻雜的硅橡膠無色、透明,在紫外燈下發(fā)出藍(lán)色熒光。使用碳量子點制備的熒光墨水,可以用于書寫和噴墨打印,此種墨水在日光燈下無字跡顯示,但是在紫外燈下顯示較為清楚的字跡。(4)通過研究多種金屬陽離子和部分陰離子對熒光碳量子點的淬滅作用發(fā)現(xiàn),少數(shù)的離子對碳量子點的熒光強(qiáng)度幾乎沒有什么影響。己烷相中的碳量子點對Fe~(3+),Fe2+,Cu2+有很強(qiáng)的響應(yīng),水相中和有機(jī)相中的碳量子點對Fe~(3+)的熒光淬滅響應(yīng)迅速。當(dāng)Fe~(3+)的濃度在100μmol/L內(nèi)水相中的碳量子點的熒光淬滅顯示明顯的線性關(guān)系;當(dāng)Fe~(3+)的濃度在10-200μmol/L之間時己烷相中的碳量子點有明顯的線性關(guān)系。
[Abstract]:Carbon quantum dots (QDs) are nontoxic and highly fluorescent nanomaterials, which have been widely used in biomedicine, photoelectric sensor and photocatalyst due to their advantages of simple preparation, good water solubility and easy functionalization. In this paper, carbon quantum dots with high fluorescence intensity and good stability were prepared by conventional microwave reactor and single-mode microwave reactor using L-cystine as raw material. The effects of various factors on the fluorescence properties of carbon quantum dots were studied and used as a fluorescent material for dyeing cotton fibers, doping silicone rubber, making invisible fluorescent ink and detecting metal ions. The main conclusions are as follows: (1) the fluorescent carbon quantum dots prepared by single-mode microwave reactor have good dispersion in aqueous solution, near spherical appearance, uneven particle size and average size of 2-6 nm. The aqueous solution of carbon quantum dots is yellowish in fluorescent light and green fluorescence in 365 nm UV lamp. The optimum fluorescence excitation wavelength is 420 nm, the maximum fluorescence emission wavelength is 505 nm, and the fluorescence quantum yield is 24 nm. The carbon quantum dots extracted into organic phase are colorless under fluorescent lamp, blue fluorescence is emitted by ultraviolet lamp, the optimum fluorescence excitation wavelength is 365 nm, the maximum fluorescence emission wavelength is 430 nm, and the average fluorescence quantum yield in chloroform and dichloromethane is 86 cm. No matter in water or organic phase, the position of maximum emission wavelength does not change with the change of excitation wavelength. The carbon point in water phase can be stored in 4 OC refrigerator for a long time, and the carbon point in organic phase can be stored for a long time at room temperature. With the increase of reaction time and the concentration of sodium hydroxide, the fluorescence intensity of the carbon quantum dots increased first and then decreased. The optimum reaction temperature is 135-140 擄C and the concentration of sodium hydroxide in the reaction system is 0.7-0.9 mol / L. Water phase carbon quantum dots have fluorescence properties in a wide range of pH, and the fluorescence intensity weakens with the increase of pH.) in the experiment, carbon quantum dots can be used as fluorescent materials to dye cotton, and can also be doped with silicone rubber. And can make fluorescent ink. It was found that the fluorescence of cotton fibers dyed with carbon quantum dots in aqueous phase was not firm enough, and that in chloroform phase, the fluorescence of cotton fibers dyed by carbon quantum dots in chloroform phase was more firm, and that silicone rubber doped with carbon quantum dots in water phase was yellowish and opaque. The ultraviolet lamp shows strong blue-green fluorescence, using organic carbon quantum dot doped silicone rubber colorless and transparent, and emitting blue fluorescence under the ultraviolet lamp. Fluorescent ink, prepared using carbon quantum dots, can be used for writing and inkjet printing, which is shown without writing in a fluorescent lamp. However, by studying the quenching effect of a variety of metal cations and some anions on the fluorescence carbon quantum dots, it is found that a few ions have little effect on the fluorescence intensity of the carbon quantum dots. The carbon quantum dots in hexane phase have a strong response to Fe~(3 and Fe _ 2O _ 2 Cu _ 2. The fluorescence quenching response of carbon quantum dots in water and organic phase to Fe~(3) is rapid. When the concentration of Fe~(3) is 100 渭 mol/L, the fluorescence quenching of carbon quantum dots in water phase shows a linear relationship, and when the concentration of Fe~(3) is between 10-200 渭 mol/L and 10-200 渭 mol/L, there is an obvious linear relationship for the carbon quantum dots in hexane phase.
【學(xué)位授予單位】：青島科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：O657.3

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本文編號：1949756