CN108179009A - A kind of europium ion-doped carbon quantum dot and preparation method thereof - Google Patents
A kind of europium ion-doped carbon quantum dot and preparation method thereof Download PDFInfo
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 56
- 229910052693 Europium Inorganic materials 0.000 title claims abstract description 45
- OGPBJKLSAFTDLK-UHFFFAOYSA-N europium atom Chemical compound [Eu] OGPBJKLSAFTDLK-UHFFFAOYSA-N 0.000 title claims abstract description 33
- 238000002360 preparation method Methods 0.000 title claims abstract description 33
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims abstract description 111
- -1 rare earth nitrate Chemical class 0.000 claims abstract description 32
- 229910052761 rare earth metal Inorganic materials 0.000 claims abstract description 26
- 238000001027 hydrothermal synthesis Methods 0.000 claims abstract description 10
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 8
- 238000006243 chemical reaction Methods 0.000 claims abstract description 8
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 7
- 238000003756 stirring Methods 0.000 claims abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 7
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims abstract description 6
- 239000007788 liquid Substances 0.000 claims abstract description 6
- 229910017604 nitric acid Inorganic materials 0.000 claims abstract description 6
- 150000002910 rare earth metals Chemical class 0.000 claims abstract description 5
- 229910001404 rare earth metal oxide Inorganic materials 0.000 claims abstract description 4
- 150000002500 ions Chemical class 0.000 claims abstract description 3
- 230000003647 oxidation Effects 0.000 claims abstract description 3
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 3
- GAGGCOKRLXYWIV-UHFFFAOYSA-N europium(3+);trinitrate Chemical compound [Eu+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O GAGGCOKRLXYWIV-UHFFFAOYSA-N 0.000 claims description 11
- 238000002156 mixing Methods 0.000 claims description 4
- 230000005284 excitation Effects 0.000 claims description 3
- 230000035484 reaction time Effects 0.000 claims description 2
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Chemical compound [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 claims 1
- 230000008901 benefit Effects 0.000 abstract description 8
- 239000002096 quantum dot Substances 0.000 abstract description 8
- NHYZIQDLKOJOSI-UHFFFAOYSA-N [C].OC(=O)CC(O)(C(O)=O)CC(O)=O Chemical compound [C].OC(=O)CC(O)(C(O)=O)CC(O)=O NHYZIQDLKOJOSI-UHFFFAOYSA-N 0.000 abstract description 6
- 230000003287 optical effect Effects 0.000 abstract description 4
- 229910002651 NO3 Inorganic materials 0.000 abstract 1
- 238000000034 method Methods 0.000 description 9
- MXJDQIWBHIXNRE-UHFFFAOYSA-B C(CC(O)(C(=O)[O-])CC(=O)[O-])(=O)[O-].[C+4].C(CC(O)(C(=O)[O-])CC(=O)[O-])(=O)[O-].C(CC(O)(C(=O)[O-])CC(=O)[O-])(=O)[O-].C(CC(O)(C(=O)[O-])CC(=O)[O-])(=O)[O-].[C+4].[C+4] Chemical compound C(CC(O)(C(=O)[O-])CC(=O)[O-])(=O)[O-].[C+4].C(CC(O)(C(=O)[O-])CC(=O)[O-])(=O)[O-].C(CC(O)(C(=O)[O-])CC(=O)[O-])(=O)[O-].C(CC(O)(C(=O)[O-])CC(=O)[O-])(=O)[O-].[C+4].[C+4] MXJDQIWBHIXNRE-UHFFFAOYSA-B 0.000 description 6
- 229910001940 europium oxide Inorganic materials 0.000 description 6
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 238000006862 quantum yield reaction Methods 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 239000008367 deionised water Substances 0.000 description 3
- 229910021641 deionized water Inorganic materials 0.000 description 3
- 238000004020 luminiscence type Methods 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 239000002202 Polyethylene glycol Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000003763 carbonization Methods 0.000 description 2
- 239000013522 chelant Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- AEBZCFFCDTZXHP-UHFFFAOYSA-N europium(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Eu+3].[Eu+3] AEBZCFFCDTZXHP-UHFFFAOYSA-N 0.000 description 2
- 238000000695 excitation spectrum Methods 0.000 description 2
- 239000002086 nanomaterial Substances 0.000 description 2
- 229920001223 polyethylene glycol Polymers 0.000 description 2
- 239000002243 precursor Substances 0.000 description 2
- 238000000197 pyrolysis Methods 0.000 description 2
- 238000003786 synthesis reaction Methods 0.000 description 2
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 229910052771 Terbium Inorganic materials 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 150000001340 alkali metals Chemical class 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000000090 biomarker Substances 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000000799 fluorescence microscopy Methods 0.000 description 1
- 238000002189 fluorescence spectrum Methods 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 231100000053 low toxicity Toxicity 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000001404 mediated effect Effects 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 238000001000 micrograph Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 150000007524 organic acids Chemical class 0.000 description 1
- 229920005862 polyol Polymers 0.000 description 1
- 150000003077 polyols Chemical class 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- GZCRRIHWUXGPOV-UHFFFAOYSA-N terbium atom Chemical compound [Tb] GZCRRIHWUXGPOV-UHFFFAOYSA-N 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
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- C09K11/08—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials
- C09K11/77—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals
- C09K11/7728—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals containing europium
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- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y20/00—Nanooptics, e.g. quantum optics or photonic crystals
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
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Abstract
Description
技术领域technical field
本发明涉及纳米材料技术领域，具体涉及一种铕离子掺杂碳量子点及其制备方法。The invention relates to the technical field of nanomaterials, in particular to a europium ion-doped carbon quantum dot and a preparation method thereof.
背景技术Background technique
碳量子点(CDs)作为这几年新发展起来的一种新型碳纳米材料，不仅具有碳骨架的独特性质，还具有比传统量子点更为优越的特性。具有与传统金属量子点相类似的荧光性能外，还具有分子量和粒径小、荧光稳定性高、无光闪烁、激发光谱宽而连续、发射波长可调谐、生物相容性好、低毒性等优点。除此以外，还因碳量子点的量子限制效应和边界效应而展现出许多特殊的性质，被认为是一种代替传统量子点进行屏幕显示、生物标记和荧光成像等研究最为理想的材料。As a new type of carbon nanomaterial newly developed in recent years, carbon quantum dots (CDs) not only have the unique properties of carbon skeleton, but also have superior characteristics than traditional quantum dots. In addition to the fluorescent properties similar to traditional metal quantum dots, it also has small molecular weight and particle size, high fluorescence stability, no light flicker, wide and continuous excitation spectrum, tunable emission wavelength, good biocompatibility, low toxicity, etc. advantage. In addition, due to the quantum confinement effect and boundary effect of carbon quantum dots, it also exhibits many special properties, and is considered to be an ideal material to replace traditional quantum dots for screen display, biomarker and fluorescence imaging.
但是目前所制备的碳量子点的荧光量子产率、荧光强度不能达到传统金属量子点的水平，在LED显示技术以及生物医学等领域的应用还不成熟，因此，对高量子产率及发光强度的碳量子点的制备及方法的探索显得及其重要。研究发现氧化法制备的碳量子点含有大量的缺陷，除了表面含有的羧基、羟基等官能团，内部还存在一系列断键。若对碳量子点进行一定程度的修饰不仅可以改变碳量子点的结构还能增强其量子产率及荧光性质。为了不影响碳点本身的优势，掺杂法为修饰碳点首要考虑的方法。However, the fluorescence quantum yield and fluorescence intensity of the carbon quantum dots prepared at present cannot reach the level of traditional metal quantum dots, and their applications in LED display technology and biomedicine are still immature. Therefore, high quantum yield and luminous intensity The preparation and method exploration of carbon quantum dots is extremely important. The study found that the carbon quantum dots prepared by the oxidation method contain a large number of defects. In addition to the functional groups such as carboxyl and hydroxyl groups on the surface, there are also a series of broken bonds inside. If the carbon quantum dots are modified to a certain extent, it can not only change the structure of carbon quantum dots but also enhance their quantum yield and fluorescence properties. In order not to affect the advantages of carbon dots themselves, the doping method is the first consideration method for modifying carbon dots.
2014年，Hailong Dong等在Polyol-mediated C-dot formation showingefficient Tb3+/Eu3+ emission一文中在碳量子点的基础上掺杂金属锌、金属镁，大大提高了碳量子点的荧光强度以及荧光量子产率。在碱金属的基础上，Hailong Dong等人又在碳量子点的基础上以聚乙二醇为碳源，掺杂了稀土铕、稀土铽制备了稀土掺杂的碳量子点，碳量子点内部表现出了向稀土离子的能量转移。但该方法中由于聚乙二醇与稀土离子的结合较弱，因此难以保证稀土离子在碳量子点上的均匀分散性。In 2014, Hailong Dong et al. in the article Polyol-mediated C-dot formation showing efficient Tb 3+ /Eu 3+ emission, doped metal zinc and metal magnesium on the basis of carbon quantum dots, which greatly improved the fluorescence intensity of carbon quantum dots and Fluorescence quantum yield. On the basis of alkali metals, Hailong Dong et al. used polyethylene glycol as a carbon source on the basis of carbon quantum dots to prepare rare earth-doped carbon quantum dots doped with rare earth europium and rare earth terbium. exhibited energy transfer to rare earth ions. However, in this method, due to the weak combination of polyethylene glycol and rare earth ions, it is difficult to ensure the uniform dispersion of rare earth ions on the carbon quantum dots.
2012年，Yongqiang Dong等人利用柠檬酸为碳源，采用热解法成功制备具有较强蓝光发射的碳量子点，柠檬酸作为一种有机酸，易于螯合金属离子，具有成本低，易溶于水等优势，除此之外，本报道采用的是高温热解法，碳量子点的形貌与性能控制较困难。In 2012, Yongqiang Dong et al. used citric acid as a carbon source to successfully prepare carbon quantum dots with strong blue light emission by pyrolysis. As an organic acid, citric acid is easy to chelate metal ions, and has low cost and easy solubility. In addition to the advantages of water, in addition, this report uses a high-temperature pyrolysis method, and it is difficult to control the morphology and properties of carbon quantum dots.
发明内容Contents of the invention
本发明所要解决的技术问题是：传统碳量子点存在发光单一性的不足，本发明提供了解决上述问题的一种铕离子掺杂碳量子点及其制备方法，具有合成产物纯度高、产物发光性与稳定性良好、碳量子点颜色可调，制备工艺简单、合成条件温和、成本低等优势。铕离子掺杂的柠檬酸碳量子点的成功制备，克服了传统碳量子点发光单一性，使得发光向红光区域移动，在光学器件和生物医学等领域应用前景好。The technical problem to be solved by the present invention is: traditional carbon quantum dots have the deficiency of luminous unity. The present invention provides a kind of europium ion-doped carbon quantum dot and its preparation method which solves the above problems. Good stability and stability, adjustable color of carbon quantum dots, simple preparation process, mild synthesis conditions, low cost and other advantages. The successful preparation of citric acid carbon quantum dots doped with europium ions overcomes the singleness of traditional carbon quantum dots, making the luminescence shift to the red light region, and has good application prospects in the fields of optical devices and biomedicine.
本发明通过下述技术方案实现：The present invention realizes through following technical scheme:
一种铕离子掺杂碳量子点，所述碳量子点以柠檬酸为前驱体碳源，铕离子掺杂离子浓度为0.5～5％，形貌为球形，直径为1～10nm。A europium ion-doped carbon quantum dot, the carbon quantum dot uses citric acid as a precursor carbon source, the doping ion concentration of the europium ion is 0.5-5%, the appearance is spherical, and the diameter is 1-10nm.
优选地，所述碳量子点在393nm激发波长下，在400-750nm区间都存在发射，其中400-575nm的宽峰属于碳量子点的特征发射，其中597nm、623、702nm处的窄峰归属于铕离子的特征发射。Preferably, the carbon quantum dots have emission in the range of 400-750nm at an excitation wavelength of 393nm, wherein the broad peak at 400-575nm belongs to the characteristic emission of carbon quantum dots, and the narrow peaks at 597nm, 623, and 702nm belong to Characteristic emission of europium ions.
制备上述铕离子掺杂碳量子点的方法，包括以下步骤：The method for preparing the above-mentioned europium ion-doped carbon quantum dots comprises the following steps:
步骤1，柠檬酸溶液的配制：称取柠檬酸置于烧杯中，加入水搅拌使溶解得柠檬酸溶液；Step 1, preparation of citric acid solution: weigh citric acid and place it in a beaker, add water and stir to dissolve to obtain citric acid solution;
步骤2，稀土硝酸铕溶液的制备：称取稀土氧化铕，滴入浓硝酸，待稀土氧化物反应完全得稀土硝酸盐铕溶液；Step 2, preparation of the rare earth europium nitrate solution: Weigh the rare earth europium oxide, drop in concentrated nitric acid, and wait until the rare earth oxide reacts completely to obtain the rare earth europium nitrate solution;
步骤3，铕离子掺杂碳量子点的制备：将步骤1制备的柠檬酸溶液和步骤2制备的稀土硝酸铕溶液混合、搅拌然后在100～240℃条件下进行2～15h的水热反应，得到的淡黄色透明液体即为铕离子掺杂碳量子点。Step 3, preparation of europium ion-doped carbon quantum dots: mixing the citric acid solution prepared in step 1 and the rare earth europium nitrate solution prepared in step 2, stirring and then performing a hydrothermal reaction at 100-240° C. for 2-15 hours, The obtained light yellow transparent liquid is europium ion doped carbon quantum dots.
优选地，所述步骤1中，配制的柠檬酸溶液的浓度为0.1～2mol/L。Preferably, in the step 1, the concentration of the prepared citric acid solution is 0.1-2 mol/L.
优选地，所述步骤2中，配制的稀土硝酸铕溶液的浓度为0.0044～0.176mol/ml。Preferably, in the step 2, the prepared rare earth europium nitrate solution has a concentration of 0.0044-0.176 mol/ml.
优选地，所述步骤3中，柠檬酸溶液和稀土硝酸铕溶液按照柠檬酸溶质和硝酸铕溶质的摩尔比为20：1～200:1混合，混合后搅拌10～20min再进行反应。Preferably, in the step 3, the citric acid solution and the rare earth europium nitrate solution are mixed according to the molar ratio of the citric acid solute and the europium nitrate solute being 20:1-200:1, and the mixture is stirred for 10-20 minutes before reacting.
优选地，所述水热反应的温度为150～220℃。Preferably, the temperature of the hydrothermal reaction is 150-220°C.
优选地，所述水热反应时间为3～8h。Preferably, the hydrothermal reaction time is 3-8 hours.
本发明具有如下的优点和有益效果：The present invention has following advantage and beneficial effect:
1、本发明采用柠檬酸为前驱体碳源，用掺杂的方式引入稀土铕离子，采用水热法成功制备铕离子掺杂的碳量子点。柠檬酸能螯合铕离子，在碳化的过程中能使铕离子嵌入碳量子点骨架，通过碳量子点与铕离子的能量传递，在纯碳量子点蓝光发射基础上得到了具有强铕离子的特征发射。通过柠檬酸鳌和稀土离子的引入，碳化后改变了碳量子点内部结构，又成功地利用碳量子点优异的生物相容性及特殊的光学性质与稀土离子结合，实现了多功能复合碳量子点的组装，可在多色成像以及传感、识别等领域实现了应用；1. The present invention uses citric acid as the precursor carbon source, introduces rare earth europium ions by doping, and successfully prepares carbon quantum dots doped with europium ions by a hydrothermal method. Citric acid can chelate europium ions. During the carbonization process, europium ions can be embedded in the framework of carbon quantum dots. Through the energy transfer between carbon quantum dots and europium ions, strong europium ions are obtained based on the blue light emission of pure carbon quantum dots. Feature launch. Through the introduction of citric acid and rare earth ions, the internal structure of carbon quantum dots was changed after carbonization, and the excellent biocompatibility and special optical properties of carbon quantum dots were successfully combined with rare earth ions to realize a multifunctional composite carbon quantum dot. The assembly of dots can be applied in the fields of multi-color imaging, sensing and identification;
2、本发明具有合成产物纯度高、产物发光性与稳定性良好、碳量子点颜色可调，制备工艺简单、合成条件温和、成本低等优势。铕离子掺杂的柠檬酸碳量子点的成功制备，克服了传统碳量子点发光单一性，使得发光向红光区域移动，在光学器件和生物医学等领域应用前景好。2. The invention has the advantages of high purity of synthetic products, good luminescence and stability of products, adjustable color of carbon quantum dots, simple preparation process, mild synthesis conditions, and low cost. The successful preparation of citric acid carbon quantum dots doped with europium ions overcomes the singleness of traditional carbon quantum dots, making the luminescence shift to the red light region, and has good application prospects in the fields of optical devices and biomedicine.
附图说明Description of drawings
此处所说明的附图用来提供对本发明实施例的进一步理解，构成本申请的一部分，并不构成对本发明实施例的限定。在附图中：The drawings described here are used to provide a further understanding of the embodiments of the present invention, constitute a part of the application, and do not limit the embodiments of the present invention. In the attached picture:
图1为本发明实施例1制备的铕离子掺杂柠檬酸碳量子点的TEM图谱；Fig. 1 is the TEM spectrum of the europium ion-doped citrate carbon quantum dot prepared by the embodiment of the present invention 1;
图2为本发明实施例1制备的铕离子掺杂柠檬酸碳量子点的荧光激发谱图；Fig. 2 is the fluorescence excitation spectrogram of the europium ion-doped citrate carbon quantum dot prepared in Example 1 of the present invention;
图3为本发明实施例1制备的铕离子掺杂柠檬酸碳量子点的荧光发射谱图；Fig. 3 is the fluorescence emission spectrogram of the europium ion-doped citrate carbon quantum dot prepared in Example 1 of the present invention;
具体实施方式Detailed ways
为使本发明的目的、技术方案和优点更加清楚明白，下面结合实施例和附图，对本发明作进一步的详细说明，本发明的示意性实施方式及其说明仅用于解释本发明，并不作为对本发明的限定。In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the examples and accompanying drawings. As a limitation of the present invention.
实施例1Example 1
步骤1，柠檬酸溶液的配制：称取2.1g柠檬酸固体颗粒置于烧杯中，加入40ml去离子水，在常温条件下搅拌使其溶解，即得所需的柠檬酸溶液；Step 1, preparation of citric acid solution: Weigh 2.1 g of citric acid solid particles and place them in a beaker, add 40 ml of deionized water, stir to dissolve at room temperature, and obtain the required citric acid solution;
步骤2，硝酸铕溶液的制备：称取0.0352g(2％)稀土氧化铕，滴入浓硝酸，待稀土氧化物反应完全，得到所需的硝酸铕溶液；Step 2, preparation of europium nitrate solution: Weigh 0.0352g (2%) rare earth europium oxide, drop into concentrated nitric acid, and wait for the rare earth oxide to react completely to obtain the required europium nitrate solution;
步骤3，铕离子掺杂柠檬酸碳量子点的制备：将柠檬酸溶液与硝酸铕溶液混合，在常温件下反应10min，然后转入反应釜中在200℃条件下进行3h的水热反应，得到的淡黄色透明液体即为铕离子掺杂柠檬酸碳量子点。其透射电子显微镜图(TEM)如图1所示，荧光激发光谱图如图2所示，荧光发射光谱如图3所示。Step 3, preparation of europium ion-doped citric acid carbon quantum dots: mix citric acid solution and europium nitrate solution, react at room temperature for 10 minutes, then transfer to a reaction kettle for 3 hours of hydrothermal reaction at 200°C, The obtained light yellow transparent liquid is europium ion-doped citrate carbon quantum dots. The transmission electron microscope image (TEM) is shown in FIG. 1 , the fluorescence excitation spectrum is shown in FIG. 2 , and the fluorescence emission spectrum is shown in FIG. 3 .
实施例2Example 2
步骤1，柠檬酸溶液的配制：称取2.1g柠檬酸固体颗粒置于烧杯中，加入40ml去离子水，在常温条件下搅拌使其溶解，即得所需的柠檬酸溶液；Step 1, preparation of citric acid solution: Weigh 2.1 g of citric acid solid particles and place them in a beaker, add 40 ml of deionized water, stir to dissolve at room temperature, and obtain the required citric acid solution;
步骤2，硝酸铕溶液的制备：称取0.0088g(0.5％)稀土氧化铕，滴入浓硝酸，待氧化铕反应完全，得到所需的硝酸铕溶液；Step 2, preparation of europium nitrate solution: Weigh 0.0088g (0.5%) rare earth europium oxide, drop into concentrated nitric acid, and wait for the complete reaction of europium oxide to obtain the required europium nitrate solution;
步骤3，铕离子掺杂柠檬酸碳量子点的制备：将柠檬酸溶液与硝酸铕溶液混合，在常温件下反应10min，然后转入反应釜中在150℃条件下进行6h的水热反应，得到的淡黄色透明液体即为铕离子掺杂柠檬酸碳量子点。Step 3, preparation of europium ion-doped citric acid carbon quantum dots: mix citric acid solution and europium nitrate solution, react at room temperature for 10 minutes, then transfer to a reaction kettle for 6 hours of hydrothermal reaction at 150°C, The obtained light yellow transparent liquid is europium ion-doped citrate carbon quantum dots.
实施例3Example 3
步骤1，柠檬酸溶液的配制：称取2.1g柠檬酸固体颗粒置于烧杯中，加入40ml去离子水，在常温条件下搅拌使其溶解，即得所需的柠檬酸溶液；Step 1, preparation of citric acid solution: Weigh 2.1 g of citric acid solid particles and place them in a beaker, add 40 ml of deionized water, stir to dissolve at room temperature, and obtain the required citric acid solution;
步骤2，硝酸铕溶液的制备：称取0.086g(5％)稀土氧化铕，滴入浓硝酸，待氧化铕反应完全，得到所需的硝酸铕溶液；Step 2, preparation of europium nitrate solution: Weigh 0.086g (5%) rare earth europium oxide, drop into concentrated nitric acid, and wait for the complete reaction of europium oxide to obtain the required europium nitrate solution;
步骤3，铕离子掺杂柠檬酸碳量子点的制备：将柠檬酸溶液与硝酸铕溶液混合，在常温件下反应10min，然后转入反应釜中在240℃条件下进行2h的水热反应，得到的淡黄色透明液体即为铕离子掺杂柠檬酸碳量子点。Step 3, preparation of europium ion-doped citric acid carbon quantum dots: mix citric acid solution and europium nitrate solution, react at room temperature for 10 minutes, then transfer to a reaction kettle for 2 hours of hydrothermal reaction at 240°C, The obtained light yellow transparent liquid is europium ion-doped citrate carbon quantum dots.
以上所述的具体实施方式，对本发明的目的、技术方案和有益效果进行了进一步详细说明，所应理解的是，以上所述仅为本发明的具体实施方式而已，并不用于限定本发明的保护范围，凡在本发明的精神和原则之内，所做的任何修改、等同替换、改进等，均应包含在本发明的保护范围之内。The specific embodiments described above have further described the purpose, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above descriptions are only specific embodiments of the present invention and are not intended to limit the scope of the present invention. Protection scope, within the spirit and principles of the present invention, any modification, equivalent replacement, improvement, etc., shall be included in the protection scope of the present invention.
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