本文關(guān)鍵詞： 碳量子點(diǎn) Hg~(2+)檢測(cè) 固相熱解 熒光薄膜　出處：《鄭州大學(xué)》2016年碩士論文　論文類(lèi)型：學(xué)位論文

【摘要】：碳量子點(diǎn)是一種新型的熒光碳納米材料,其顆粒尺寸在10 nm以下,由于碳量子點(diǎn)具有獨(dú)特的激發(fā)波長(zhǎng)可協(xié)調(diào)性、生物相容性、低的細(xì)胞毒性等特征,其在熒光成像、離子檢測(cè)、生物傳感等方面有著廣闊的應(yīng)用前景。本文以碳量子點(diǎn)新的制備方法為對(duì)象展開(kāi)研究,以不同原料作為碳的前驅(qū)體,采用不同的制備方法得到熒光性能優(yōu)越的氮摻雜碳量子點(diǎn),并對(duì)其熒光性質(zhì)、形貌、結(jié)構(gòu)、應(yīng)用等進(jìn)行探索,主要研究?jī)?nèi)容如下:第一部分,以微晶纖維素為制備原料,采用固相熱解的制備方法,使纖維素在氨氣氣氛中直接碳化、熱解制備氮摻雜的碳量子點(diǎn)(N-CQDs1),并探索反應(yīng)時(shí)間、反應(yīng)溫度對(duì)N-CQDs1制備的影響。所得N-CQDs1具有較好的水溶性、激發(fā)波長(zhǎng)依賴(lài)性、抗光漂白性、pH穩(wěn)定性等。實(shí)驗(yàn)中發(fā)現(xiàn)Hg~(2+)可以有效的淬滅N-CQDs1,對(duì)其表現(xiàn)出了較好的選擇性。碳量子點(diǎn)作為Hg~(2+)納米探針,其檢測(cè)限為7.7 nM,此結(jié)果低于美國(guó)環(huán)境署規(guī)定的最低檢測(cè)限10 nM。第二部分,首次以懷山藥為碳源,加入飽和硫酸銨溶液,采用水熱的方法制備氮摻雜的熒光碳量子點(diǎn)(N-CQDs2)�？疾炝烁髦苽錀l件對(duì)于碳量子點(diǎn)熒光性能的影響,結(jié)果表明,在反應(yīng)溫度為200°C、時(shí)間為12 h、懷山藥用量為15 g時(shí),所得氮摻雜碳量子點(diǎn)的性能最佳。同時(shí)探討了碳量子點(diǎn)在防偽識(shí)別和熒光薄膜中的應(yīng)用。本文所提出的碳量子點(diǎn)制備方法,具有原料易得、成本較低、易于規(guī)�；苽�,過(guò)程碳化程度高、產(chǎn)品應(yīng)用領(lǐng)域?qū)Ｒ坏忍攸c(diǎn)。制備方法鮮見(jiàn)文獻(xiàn)報(bào)道,有一定創(chuàng)新性。在碳量子點(diǎn)的多樣化制備方面具有一定的參考價(jià)值。
[Abstract]:Carbon quantum dots (QDs) are novel fluorescent carbon nanomaterials with particle size below 10 nm. Because of their unique characteristics of excitation wavelength compatibility, biocompatibility and low cytotoxicity, carbon quantum dots are used in fluorescence imaging and ion detection. In this paper, the new preparation method of carbon quantum dots is studied, and different raw materials are used as precursors to obtain nitrogen-doped carbon quantum dots with excellent fluorescence properties. The fluorescence properties, morphology, structure and application of microcrystalline cellulose were investigated. The main contents were as follows: in the first part, the cellulose was directly carbonized in ammonia atmosphere by solid phase pyrolysis. N-doped carbon quantum dots (N-CQDs1) were prepared by pyrolysis. The effects of reaction time and reaction temperature on the preparation of N-CQDs1 were investigated. The N-CQDs1 was water-soluble and excited wavelength dependent. It is found that Hg~(2) can effectively quench N-CQDs1 and exhibit good selectivity. Carbon quantum dots are used as Hg~(2 nanoprobes. The detection limit is 7.7 nm, which is lower than the minimum detection limit of 10 nm. The second part uses Dioscorea yam as carbon source to add saturated ammonium sulfate solution for the first time. N-doped carbon quantum dots N-CQDs2 were prepared by hydrothermal method. The effects of preparation conditions on the fluorescence properties of carbon quantum dots were investigated. The results showed that the reaction temperature was 200 擄C, the time was 12 h, and the dosage of Dioscorea yam was 15 g. At the same time, the application of carbon quantum dots in anti-counterfeiting recognition and fluorescence thin film is discussed. The preparation method of carbon quantum dots proposed in this paper is easy to obtain raw materials, low cost and easy to be prepared on a large scale. The preparation method is rarely reported in literature and has some innovation. It has certain reference value in the diversification of preparation of carbon quantum dots.
【學(xué)位授予單位】：鄭州大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類(lèi)號(hào)】：O657.3;O613.71

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