發(fā)布時(shí)間：2018-01-20 11:15

  本文關(guān)鍵詞： ZnS納米晶 離子液體 摻雜離子 熒光　出處：《河南科技大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：半導(dǎo)體納米晶由于量子限域效應(yīng),導(dǎo)致具有特殊的光電性能,使其應(yīng)用領(lǐng)域越來(lái)越廣泛,尤其在生物分子標(biāo)記領(lǐng)域體現(xiàn)出了潛在的應(yīng)用價(jià)值。目前,用作生物標(biāo)記的量子點(diǎn)主要是CdSe、CdS、CdS/Zn S(Zn Se)、Cd Te/ZnS等體系,但都含有Cd元素,其毒性一直是人們擔(dān)心的問(wèn)題。ZnS是一種寬帶隙II-VI族半導(dǎo)體材料,是一種良好的摻雜基質(zhì),摻雜后可以得到不同波段的、發(fā)光效率高的半導(dǎo)體納米晶,有望成為新型、高靈敏的熒光標(biāo)記物。本文以1-乙基-3-甲基咪唑四氟硼酸鹽離子液體和水的混合溶液作為反應(yīng)溶劑,采用溶劑熱法合成了不同離子摻雜的ZnS納米晶。通過(guò)X射線衍射儀(XRD)、X光電子能譜儀(XPS)、透射電鏡(TEM)研究其物相、相貌和尺寸;結(jié)合F-280熒光分光光度譜儀和Zolix SBP-300型光柵光譜儀研究納米晶的光學(xué)性能。研究結(jié)果如下:1.ZnS納米晶(摻雜離子為Cu,Fe,Er,Yb)顆粒近似呈球形,粒度約3-10nm,部分粉體出現(xiàn)少量的團(tuán)聚現(xiàn)象;選區(qū)衍射中的電子衍射環(huán)表明合成的Zn S納米晶為多晶結(jié)構(gòu)。2.Cu、Fe、Er、Yb摻雜離子分別以Cu+/Cu2+、Fe2+、Er3+、Yb3+形式摻雜到ZnS納米晶中;Fe離子摻雜后,增加了Cu2+在ZnS納米晶中的含量;Yb離子摻雜后,增加了Er3+在ZnS納米晶中的含量。3.ZnS:Cu納米晶有兩個(gè)較強(qiáng)的發(fā)射峰分別位于425nm和468nm處。200℃時(shí),Cu2+離子摻雜量為2%時(shí),ZnS:Cu納米晶發(fā)光強(qiáng)度達(dá)到最強(qiáng)。Fe摻雜后,Zn S:Cu納米晶的熒光峰強(qiáng)度增加;反應(yīng)溫度為140℃,反應(yīng)時(shí)間為10h,摻雜量為2%的Cu/Fe的ZnS納米晶熒光性能最好。4.Zn S:Er納米晶在420nm,470nm和530nm處出現(xiàn)了新的發(fā)光峰。反應(yīng)溫度為120℃,反應(yīng)時(shí)間為10h,摻雜量為2%的ZnS:Er納米晶熒光性能最好;140℃時(shí),反應(yīng)時(shí)間為8h和10h時(shí),均當(dāng)摻雜濃度為2%時(shí),Zn S:Er/Yb納米晶熒光強(qiáng)度達(dá)到最強(qiáng)。5.采用980nm、200mW激光器對(duì)ZnS:Er/Yb納米晶進(jìn)行激發(fā),獲得了4f-4f軌道電子的上轉(zhuǎn)換發(fā)光,出現(xiàn)了540nm(綠色)和655nm(橙紅色)兩個(gè)熒光峰。本文通過(guò)Cu、Fe、Er、Yb離子的摻雜,獲得激發(fā)光和發(fā)射光可調(diào)的無(wú)鎘半導(dǎo)體ZnS納米晶,有望將其應(yīng)用于發(fā)光器件和生物標(biāo)記領(lǐng)域。
[Abstract]:Semiconductor nanocrystals have special optoelectronic properties due to the quantum limiting effect, which makes their applications more and more extensive, especially in the field of biomolecules. The quantum dots used as biomarkers are mainly CdSee / CDs / ZnSU / ZnSee / CD Te/ZnS systems, but all of them contain CD elements. Its toxicity has always been a concern. ZnS is a wide band gap II-VI semiconductor materials, is a good doped substrate, doping can be obtained in different bands. Semiconductor nanocrystalline with high luminescence efficiency is expected to be a new and highly sensitive fluorescent marker. In this paper, the mixed solution of 1-ethyl-3-methylimidazolium tetrafluoroborate ionic liquid and water is used as the reaction solvent. ZnS nanocrystals doped with different ions were synthesized by solvothermal method. The phase of ZnS nanocrystals was studied by X-ray diffractometer X-ray photoelectron spectroscopy (XPS) and transmission electron microscopy (TEM). Appearance and size; The optical properties of nanocrystals were studied by F-280 fluorescence spectrometer and Zolix SBP-300 grating spectrometer. The results are as follows: 1. ZnS nanocrystalline (doped ion is Cu). The particle size is about 3-10 nm, and a small amount of agglomeration occurs in some of the powders. The electron diffraction ring in the selected area diffraction shows that the synthesized ZnS nanocrystals are polycrystalline structure. 2. The doped ions of Cu / Cu ~ (2 +) and Fe _ (2) O _ (2) er _ (3) respectively. Yb3 was doped into ZnS nanocrystals. Fe ion doping increased the content of Cu2 in ZnS nanocrystals. Yb ion doping increases the content of Er3 in ZnS nanocrystals. 3. There are two strong emission peaks of ZnS: cu nanocrystals at 425nm and 468nm at .200 鈩，

本文編號(hào)：1447989