【摘要】： 誕生于20世紀(jì)80年代的納米科學(xué)技術(shù),經(jīng)過近30年的發(fā)展取得了突破性的進(jìn)展。其中,有關(guān)半導(dǎo)體納米微晶的研究是納米材料研究的一個(gè)重要方向。半導(dǎo)體納米微晶,又稱量子點(diǎn),因其獨(dú)特的零維結(jié)構(gòu)顯示出了特殊的理化性質(zhì)及良好的光學(xué)性能。相比一般的有機(jī)熒光染料,量子點(diǎn)具有量子產(chǎn)率高、激發(fā)光譜寬、發(fā)射光譜窄、抗光漂白能力強(qiáng)、穩(wěn)定性及生物兼容性較好等優(yōu)點(diǎn)。因此,針對(duì)納米量子點(diǎn)的合成和應(yīng)用研究,受到了許多學(xué)科研究工作者的廣泛關(guān)注。 本論文共分為兩部分,第一章是緒論,主要對(duì)量子點(diǎn)的基本概念、性質(zhì)、結(jié)構(gòu)和發(fā)光機(jī)理、合成方法及其應(yīng)用等方面的內(nèi)容進(jìn)行了介紹。第二章是研究報(bào)告,共分為三小節(jié),介紹了分別以谷胱甘肽(GSH)和巰基化殼聚糖為穩(wěn)定劑合成量子點(diǎn),并對(duì)其進(jìn)行沉淀、離心、干燥等處理過程制備了能夠長(zhǎng)期穩(wěn)定存在的量子點(diǎn)粉末,并應(yīng)用其對(duì)非滲透性及滲透性不同客體上的潛在指紋進(jìn)行顯現(xiàn),獲得了良好的顯現(xiàn)效果。同時(shí)還討論了量子點(diǎn)與潛在指紋的相互作用的可能機(jī)理。現(xiàn)將研究報(bào)告部的內(nèi)容簡(jiǎn)要介紹如下： 一、GSH-capped CdS QDs溶液在潛在指紋顯現(xiàn)中的應(yīng)用 這部分實(shí)驗(yàn)制備了水溶性的GSH-capped CdS QDs溶液,通過紫外-可見吸收光譜、熒光發(fā)射光譜、透射電子顯微鏡等表征方法對(duì)合成的量子點(diǎn)溶液進(jìn)行表征,發(fā)現(xiàn)合成的量子點(diǎn)溶液具有優(yōu)異的光學(xué)性能,透射電鏡照片表明所合成的量子點(diǎn)近似球形,粒徑分布均勻,在溶液中單分散性良好,同時(shí)討論了反應(yīng)時(shí)間對(duì)量子點(diǎn)粒徑及發(fā)光顏色的影響。應(yīng)用合成的量子點(diǎn)溶液對(duì)非滲透性客體玻璃上用“502”膠熏過的潛在指紋顯現(xiàn),獲得了較好的顯現(xiàn)效果,同時(shí)討論了量子點(diǎn)與指紋作用的可能機(jī)理。 二、GSH-capped CdTe QDs粉末的制備和指紋顯現(xiàn)中的應(yīng)用 GSH-capped CdS QDs溶液的發(fā)光顏色隨合成時(shí)間的延長(zhǎng)改變不明顯,而GSH-capped CdTe QDs量子點(diǎn)隨回流時(shí)間的延長(zhǎng)經(jīng)歷了從綠色-黃色-橙色-紅色-深紅色的變化過程,顏色比較豐富。適合背景復(fù)雜客體上潛在指紋的顯現(xiàn)。因此,本部分主要合成了GSH-capped CdTe QDs,并且將合成的量子點(diǎn)溶液進(jìn)行離心、干燥等處理得到了不同發(fā)光顏色的具有優(yōu)異光學(xué)性能的量子點(diǎn)粉末。再結(jié)合粉末法對(duì)玻璃、鋁片、紙幣、紙片上用“502”熏過及未熏過的潛在指紋進(jìn)行顯現(xiàn),顯現(xiàn)出的指紋清晰可辨,反差明顯,效果良好。 三、CTS-TGA-capped CdTe QDs粉末在潛在指紋顯現(xiàn)中的應(yīng)用 對(duì)分子量為十萬(wàn)左右的殼聚糖水解得水溶性低分子量的殼聚糖,用巰基乙酸對(duì)其進(jìn)行巰基化后作為合成CdTe QDs的穩(wěn)定劑。熒光光譜表征表明,合成的量子點(diǎn)溶液最大發(fā)射波長(zhǎng)為546nm,發(fā)射峰峰形基本對(duì)稱,將合成的巰基化殼聚糖修飾的CdTe QDs溶液處理后得量子點(diǎn)粉末后,應(yīng)用粉末對(duì)玻璃、鋁片、銅片上用“502”熏過及未熏過的潛在指紋進(jìn)行顯現(xiàn),均取得了明顯的顯現(xiàn)效果。
[Abstract]:Nanoscale science and technology, born in 1980s, have made breakthrough progress after nearly 30 years of development. Among them, the study of semiconductor nanocrystals is an important direction in the research of nanomaterials. Semiconductor nanocrystals, also known as quantum dots, show special physical and chemical properties and good light because of their unique zero dimensional structure. Compared with the general organic fluorescent dyes, quantum dots have the advantages of high quantum yield, wide excitation spectrum, narrow emission spectrum, strong anti photobleaching ability, good stability and biocompatibility. Therefore, the research on the synthesis and application of nanoscale quantum dots is widely concerned by many researchers.
This paper is divided into two parts. The first chapter is introduction. The basic concepts, properties, structure and luminescence mechanism, synthesis methods and applications of quantum dots are introduced. The second chapter is the study report, which is divided into three sections, and the synthesis of quantum dots with GSH and Mercapto chitosan as stabilizers is introduced. In the process of precipitation, centrifugation and drying, a quantum dot powder which can be stable for a long time has been prepared, and the potential fingerprint of different osmosis and permeability objects has been displayed. The possible mechanism of the interaction between the quantum dots and the latent fingerprints is also discussed. The content of the report department is briefly described as follows:
Application of GSH-capped CdS QDs solution in latent fingerprints
The water-soluble GSH-capped CdS QDs solution was prepared in this experiment. The synthesized quantum dot solution was characterized by UV visible absorption spectrum, fluorescence emission spectrum, transmission electron microscope and other characterization methods. It was found that the synthesized quantum dots solution had excellent optical properties. Transmission electron microscope photographs showed that the synthesized quantum dots were similar. The particle size distribution is uniform and the monodisperse in the solution is good. At the same time, the effect of the reaction time on the particle size and luminescence color of the quantum dots is discussed. The application of the synthesized quantum dots solution to the latent fingerprint of the non permeable guest glass with "502" glue is shown, and the quantum dots and the fingerprint are also discussed. The possible mechanism for use.
Two, preparation of GSH-capped CdTe QDs powder and application in fingerprint display.
The luminescence color of GSH-capped CdS QDs solution is not obvious with the prolongation of the synthesis time. While the GSH-capped CdTe QDs quantum dots have experienced the process of changing from green to orange to red to red and rich in color. It is suitable for the appearance of potential fingerprints on the complex background objects. Therefore, this part mainly syntheses the G. SH-capped CdTe QDs, and the synthesis of the quantum dot solution is centrifuged, drying and other treatment to obtain different luminous colors with excellent optical properties of quantum dots with excellent optical properties. Then the powder method is used to show the potential fingerprint of "502" and not smoked on glass, aluminum, paper, and paper. Obviously, the effect is good.
Three, the application of CTS-TGA-capped CdTe QDs powder in latent fingerprints.
Chitosan was hydrolyzed to a water-soluble low molecular weight chitosan with a molecular weight of about one hundred thousand. Mercapto acetic acid was used as a stabilizer for the synthesis of CdTe QDs. The fluorescence spectra showed that the maximum emission wavelength of the synthesized quantum dot solution was 546nm, the peak of the emission peak was symmetric, and the synthesized mercapto chitosan modified Cd After the Te QDs solution was treated with a quantum dot powder, the powder was used to show the potential fingerprint of "502" and not fumigating on the glass, aluminum and copper.
【學(xué)位授予單位】：陜西師范大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2010
【分類號(hào)】：O614.242;D918.2

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