本文選題：氧化石墨烯 + 石墨烯量子點�。� 參考：《貴州大學(xué)》2017年碩士論文

【摘要】：本文首先研究了氧化石墨烯的制備工藝,通過改進Hummers法制備得到氧化石墨烯。得到的氧化石墨烯,通過了XRD、TEM及拉曼光譜表征,證明了其優(yōu)良的性能。利用制得的氧化石墨烯作為前驅(qū)體,采用水熱合成法,進一步研究制備了石墨烯量子點。得到的石墨烯量子點在320nm波長的激發(fā)光激發(fā)下,發(fā)射出435nm波長的藍光。通過AFM測試看到,量子點的尺寸均在15-50nm大小,厚度約為3-5nm,這說明水熱切割后的量子點同樣保持了石墨烯的二維少層結(jié)構(gòu)。對其水熱制備工藝進行了研究發(fā)現(xiàn),石墨烯量子點在9小時水熱時間、24小時透析時間及140℃水熱溫度條件下,制備得到的石墨烯量子點熒光強度最強。采用最優(yōu)制備參數(shù)得到的石墨烯量子點其熒光強度約為改進前的3倍,同時在6個月的靜置后其熒光強度幾乎未發(fā)生變化,說明得到的石墨烯量子點有著很好的穩(wěn)定性。實現(xiàn)了工藝可控后,選擇半胱氨酸摻雜對峰位可控進行了研究。通過利用水熱條件發(fā)生縮合反應(yīng),將半胱氨酸的含氮硫基團鍵合在石墨烯量子點上,從而改變其發(fā)射波長。研究還發(fā)現(xiàn),半胱氨酸在水熱環(huán)境下會與自身發(fā)生反應(yīng),聚合形成新的量子點,其激發(fā)與發(fā)射光譜的峰位分別位于320nm及435nm處,與石墨烯量子點基本相同。通過調(diào)控半胱氨酸和氧化石墨烯的用量比,我們可以控制得到的量子點發(fā)射光譜峰位在390nm到435nm間有規(guī)律的變化,實現(xiàn)峰位可控。
[Abstract]:In this paper, the preparation process of graphene oxide was studied, and graphene oxide was prepared by improved Hummers method. The obtained graphene oxide was characterized by TEM and Raman spectra. Graphene oxide quantum dots were prepared by hydrothermal synthesis using graphene oxide as precursor. The obtained graphene quantum dots emit blue light of 435nm wavelength under the excitation of 320nm wavelength. The results show that the size of the QDs is about 3-5 nm and the size of the QDs is about 3-5 nm, which indicates that the hydrothermally cut QDs also maintain the two-dimensional structure of graphene. It was found that the highest fluorescence intensity of graphene quantum dots was obtained under the conditions of 9 hours hydrothermal time, 24 hours dialysis time and 140 鈩，

本文編號：2080304