本文選題：碳量子點(diǎn) + 綠色合成　； 參考：《山西大學(xué)》2017年碩士論文

【摘要】：碳量子點(diǎn)(CQDs)作為碳納米材料家族的后起之秀,因其原材料廣、成本低廉、光學(xué)性能穩(wěn)定、生物相容性好、制備方法多樣等優(yōu)勢,在研究初期便受到了廣泛的關(guān)注。近幾年,CQDs作為熒光納米傳感器對(duì)金屬陽離子或有機(jī)小分子的識(shí)別與檢測方面仍是研究熱點(diǎn)。本論文采用一步水熱法合成了三種藍(lán)色熒光CQDs,對(duì)其形貌進(jìn)行了表征,測試了其光譜性質(zhì),分別實(shí)現(xiàn)了其對(duì)苦味酸(PA)、pH、和Fe~(3+)/抗壞血酸(AA)的分析檢測。第一章:簡要概述了CQDs的合成、光學(xué)性質(zhì)、及作為熒光納米傳感應(yīng)用方面的研究進(jìn)展。第二章:以香蕉汁為綠色碳源,采用簡單、經(jīng)濟(jì)的一步水熱法合成了水溶性好,穩(wěn)定性高的藍(lán)色熒光CQDs。通過X射線衍射(XRD)、透射電鏡(TEM)、傅立葉紅外光譜(FT-IR)、紫外-可見吸收光譜(UV-vis)、及熒光光譜(FL)等方法對(duì)CQDs的形貌、結(jié)構(gòu)以及光譜性能進(jìn)行了表征。研究發(fā)現(xiàn),苦味酸(PA)對(duì)該CQDs熒光具有猝滅作用,其猝滅程度與PA濃度在0.5~30.4μM的范圍內(nèi)呈良好的線性關(guān)系,檢出限為94.8nM(S/N=3)。該方法可用于實(shí)際樣品中PA的測定,方法回收率為96.4%~101.4%。通過紫外吸收光譜和熒光壽命衰減曲線的變化確定了二者的猝滅類型為靜態(tài)猝滅。第三章:以柳絮為綠色碳源,通過一步水熱法合成出藍(lán)色CQDs。該CQDs的熒光量子產(chǎn)率(QY)為4.93%,熒光壽命為3.322ns�；谠揅QDs對(duì)pH的敏感響應(yīng),構(gòu)建了可逆pH傳感體系。該pH傳感不受離子強(qiáng)度,金屬離子的影響。該CQDs的熒光強(qiáng)度在pH值6-12的范圍內(nèi)呈現(xiàn)良好的線性關(guān)系,其線性回歸方程為F=-138.81pH+1736.64,相關(guān)系數(shù)R2為0.994。采用本法測定了當(dāng)?shù)刈詠硭头诤铀衟H值,結(jié)果滿意。第四章:以天然產(chǎn)物黑芝麻為原料,采用水熱法一步合成了穩(wěn)定發(fā)藍(lán)光的CQDs。在Fe~(3+)存在下,該水溶性CQDs的熒光有顯著猝滅現(xiàn)象,加入抗壞血酸(AA)后對(duì)Fe~(3+)有還原作用,使CQDs-Fe~(3+)體系的熒光猝滅產(chǎn)生一定程度的恢復(fù)行為,且恢復(fù)程度與AA的濃度呈線性關(guān)系�；贑QDs的這種熒光“關(guān)-開”現(xiàn)象,建立了對(duì)Fe~(3+)和AA具有選擇性響應(yīng)的Turn-on型熒光傳感分析技術(shù)。該方法Fe~(3+)和AA的線性范圍分別為50-1500μM和32.2-987.6μM。Fe~(3+)和AA的檢出限分別為2.78μM和0.0344μM。第五章:對(duì)本論文的工作進(jìn)行了簡要總結(jié),并對(duì)CQDs面臨的挑戰(zhàn)和下一步研究方向做出了展望。
[Abstract]:Carbon Quantum Dots (CQDs), as a rising star of carbon nanomaterial family, has attracted wide attention in the early stage of research because of its advantages of wide raw materials, low cost, stable optical properties, good biocompatibility and various preparation methods. In recent years, CQDs as a fluorescent nanosensor for the recognition and detection of metal cations or organic small molecules is still a research hotspot. In this paper, three kinds of blue fluorescent CQDswere synthesized by one step hydrothermal method. Their morphology was characterized, their spectral properties were tested, and the pH of picric acid and Fe~(3 / ascorbic acid were determined. Chapter 1: the synthesis, optical properties and applications of CQDs as fluorescent nanosensors are briefly reviewed. In chapter 2, using banana juice as green carbon source, blue fluorescent CQDs with good water solubility and high stability were synthesized by a simple and economical one step hydrothermal method. The morphology, structure and spectral properties of CQDs were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), UV-vis (UV-vis) and fluorescence spectroscopy (CQDs). It was found that the fluorescence of CQDs was quenched by picric acid (PAA), and the quenching degree was linear with the concentration of PA in the range of 0.5 渭 m and 30.4 渭 M. the detection limit was 94.8 nMN / N ~ (3 +). The method can be applied to the determination of PA in practical samples. The recovery of the method is 96. 4% and 101.4%. According to the change of UV absorption spectrum and fluorescence lifetime decay curve, the quenching type of them is static quenching. Chapter 3: blue CQDs were synthesized by one step hydrothermal method with catkins as green carbon source. The fluorescence quantum yield (QY) of the CQDs is 4.93 and the fluorescence lifetime is 3.322 ns. Based on the pH sensitivity of the CQDs, a reversible pH sensing system was constructed. The pH sensor is not affected by ionic strength and metal ions. The fluorescence intensity of the CQDs shows a good linear relationship in the range of pH 6-12. The linear regression equation is F=-138.81pH 1736.64, and the correlation coefficient R2 is 0.994. The pH value of local tap water and Fenhe river water was determined by this method with satisfactory results. Chapter 4: using black sesame as raw material, CQDs with stable blue light were synthesized by hydrothermal method. In the presence of Fe~(3, the fluorescence of the water-soluble CQDs was significantly quenched. After adding ascorbic acid (AAA), the Fe~(3) was reduced to a certain extent, and the fluorescence quenching of the CQDs-Fe~(3) system was induced to a certain extent. The degree of recovery was linear with the concentration of AA. Based on the "turn-on" phenomenon of CQDs, a Turn-on type fluorescence sensing technique with selective response to Fe~(3 and AA was established. The linear ranges of Fe~(3 and AA are 50-1500 渭 M and 32.2-987.6 渭 M.Fe~(3, respectively. The detection limits of AA are 2.78 渭 M and 0.0344 渭 M, respectively. Chapter 5: this paper briefly summarizes the work of this paper, and the challenges faced by CQDs and the future research direction are prospected.
【學(xué)位授予單位】：山西大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：O657.3

【參考文獻(xiàn)】

相關(guān)期刊論文 前2條

1 余穎昊;杜斌;丁志軍;王普紅;郭磊;余建華;胡雨來;;萘酰亞胺衍生物的合成及對(duì)苦味酸的檢測[J];發(fā)光學(xué)報(bào);2015年01期

2 王書民;樊雪梅;白曉晶;陳鳳英;王憲生;;KMnO_4-乙二醛化學(xué)發(fā)光法測定苦味酸[J];分析試驗(yàn)室;2011年08期

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本文編號(hào)：1832062