CN111057541B - 一种氮掺杂橘色荧光碳量子点及其制备方法和应用 - Google Patents

一种氮掺杂橘色荧光碳量子点及其制备方法和应用 Download PDF

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CN111057541B
CN111057541B CN202010033252.XA CN202010033252A CN111057541B CN 111057541 B CN111057541 B CN 111057541B CN 202010033252 A CN202010033252 A CN 202010033252A CN 111057541 B CN111057541 B CN 111057541B
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孟雅婷
焦媛
张羱
路雯婧
宋胜梅
双少敏
董川
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Abstract

本发明提供一种氮掺杂橘色碳量子点及其制备方法,该方法是将中性红与谷氨酰胺按一定比例溶于水中,在150~250℃下反应2~7小时以合成氮掺杂橘色碳点。该方法制备碳点工艺简单,原料来源广泛且价格便宣,制备条件要求低,所得碳量子点量子产率较高。本发明碳量子点作为荧光探针用于ClO的检测,还可在活细胞荧光成像中应用。

Description

一种氮掺杂橘色荧光碳量子点及其制备方法和应用
技术领域
本发明涉及碳发光纳米材料,尤其涉及碳量子点,具体是一种氮掺杂橘色荧光碳量子点及其制备方法和应用。
背景技术
次氯酸根阴离子(ClO-)及其共轭酸(HOCl)涉及多种病理性疾病,包括动脉粥样硬化,神经元变性,囊性纤维化,关节炎和癌症。生物学上,已知次氯酸是重要的活性氧物质之一,并且不受控制的HOCl水平将破坏DNA和蛋白质,从而导致各种疾病。然而,在我们的日常生活中,HOCl/ClO-作为饮用水、游泳池水的消毒剂和家用漂白剂被广泛使用。因此,对次氯酸盐具有高灵敏度和选择性的实时检测是至关重要的。
荧光检测作为一种传统的分析方法已被广泛应用于分析化学、环境生物学、生物化学和医学等众多领域,因为它具有灵敏度高、设备价格低廉、瞬时响应和实时检测等特点。近年来,碳点作为一种零维纳米材料,由于其良好的光稳定性、水溶性、生物相容性等优点引起了广泛的关注。
发明内容
本发明的目的在于提供一种氮掺杂橘色碳量子点及其制备方法;该方法制备碳点工艺简单、原料来源广泛且价格便宣,制备条件要求低且环境友好,在一般实验室均能合成,易于推广;碳量子点可用于检测水溶液和细胞中的ClO-
本发明提供的一种氮掺杂橘色荧光碳量子点的制备方法,包括如下步骤:
室温下,按摩尔比1:1-6将中性红和谷氨酰胺溶于水中,将溶液转移至水热反应釜中,150~250℃下反应2~7小时,过滤不溶物后得到浅红色溶液;通过500~1000Da的透析袋,在容器中透析处理至少3天,即得到纯净的碳量子点的水溶液;将其冷冻干燥后得到目标碳量子点。
所述中性红和谷氨酰胺的摩尔比优选为1:1-5。
所述的反应温度优选为170~200℃,反应时间为3~6小时;更优选反应温度180℃,反应时间4小时。
上述方法制备的碳量子点作为荧光探针可用于检测水溶液中的ClO-,根据公式cmin=3sb/S求出最低检出限为0.012μM,线性范围0-0.155μM。
本发明的优点与效果是:
本发明通过一步水热法即可得到碳量子点溶液,合成方法简单有效,原料廉价易得,反应条件温和且环境友好,在一般实验室均能完成,易于推广。所制备的碳量子点作为探针可用于ClO-的检测。
附图说明
图1为实施例1制备的碳量子点的荧光发射光谱
图2为实施例1制备的碳量子点的红外光谱图,图中横坐标为检测波长,纵坐标为透过率
图3为ClO-淬灭实施例1制备的碳量子点的荧光光谱图,
图4为实施例1制备的碳量子点荧光发射曲线随激发波长变化的光谱图
图5为实施例1制备的碳量子点被ClO-猝灭的激光共聚焦图,所述的细胞为PC-12细胞
具体实施方式
下面结合附图以及具体实施例对本发明做出进一步说明,实施例给出了详细的实施方式和具体的操作过程,但本发明的保护范围不限于下述的实施例。
实施例1
步骤1,室温下,将0.0059g(20mM)的中性红和0.0146g(100mM)的谷氨酰胺溶于20ml水中,充分搅拌,超声得到澄清溶液。
步骤2,将溶液转移至50ml水热反应釜中。
步骤3,将水热釜置于烘箱中,180℃反应4小时,得到红色溶液。
步骤4,过滤不溶物后得到红色溶液。通过1000Da的透析袋,在玻璃容器中透析处理至少3天,即得到纯净的碳量子点的水溶液。
步骤5,将上述荧光碳量子点水溶液冷冻干燥后得到荧光碳量子点(N-CDs),其相对量子产率(以荧光素为标准)为30.3%。
性质表征见图1、2、4。图1为实施例1制备的碳量子点的荧光发射光谱图,可见该碳量子点的激发波长为520nm,发射波长为610nm。图2为实施例1制备的碳量子点的红外光谱图,N-CDs的特征峰位于3242-3328cm-1、2987cm-1、2890cm-1、1629cm-1和1050cm-1,分别对应O-H拉伸振动、-NH2、C-H、C=C、C=N和C-O-C。图4为实施例1制备的N-CDs的荧光发射曲线随激发波长变化的光谱图,该碳量子点具有激发波长依赖的性质。
实施例2
除谷氨酰胺的质量为0.0029g(20mM),其它均与实施例1相同。其相对量子产率(以荧光素为标准)为22.6%。
实施例3
除谷氨酰胺的质量为0.0058g(40mM),其它均与实施例1相同。其相对量子产率(以荧光素为标准)为26.4%。
实施例4
除谷氨酰胺的质量为0.0088g(60mM),其它均与实施例1相同。其相对量子产率(以荧光素为标准)为28.1%。
实施例5
称取实施例1制备的N-CDs 10mg,加入10ml二次水。配成1mg/ml的碳点母液。将0.3ml碳点母液和1.7ml二次水加入荧光比色杯中,然后向荧光杯中滴加1μL不同浓度的ClO-(0-0.155μM),并测其荧光发射光谱,见图3。
实施例6
实施例1制备的N-CDs水溶液(0.25mg/mL)用于标记的PC-12细胞,如图5所示,细胞形态良好,可见碳量子点没有细胞毒性,可用于活细胞标记。图5为实施例1制备的碳量子点在不同激光器下被ClO-猝灭的激光共聚焦图,从左到右依次为:405nm(蓝色),488nm(绿色),561nm(红色)。

Claims (7)

1.一种氮掺杂橘色荧光碳量子点的制备方法,其特征在于,包括如下步骤:
室温下,按摩尔比1:1-6将中性红和谷氨酰胺溶于水中,将溶液转移至水热反应釜中,150~250℃下反应2~7小时,过滤不溶物后得到红色溶液;通过500~1000Da的透析袋,在容器中透析处理至少3天,即得到纯净的碳量子点的水溶液;将其冷冻干燥后得到目标碳量子点。
2.如权利要求1所述的一种氮掺杂橘色荧光碳量子点的制备方法,其特征在于,所述中性红和谷氨酰胺的摩尔比为1:1-5。
3.如权利要求1所述的一种氮掺杂橘色荧光碳量子点的制备方法,其特征在于,所述的反应温度为170~200℃,反应时间为3~6小时。
4.如权利要求3所述的一种氮掺杂橘色荧光碳量子点的制备方法,其特征在于,所述的反应温度为180℃,反应时间为4小时。
5.如权利要求1-4任一所述方法制备的氮掺杂橘色荧光碳量子点。
6.如权利要求5所述的氮掺杂橘色荧光碳量子点作为荧光探针检测ClO-的应用。
7.如权利要求5所述的氮掺杂橘色荧光碳量子点在制备细胞荧光成像试剂中的应用。
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