CN106872437A - 一种基于MOFs前驱体的指纹快速显现试剂及其应用 - Google Patents
一种基于MOFs前驱体的指纹快速显现试剂及其应用 Download PDFInfo
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Abstract
本发明提供了一种基于MOFs前驱体的指纹快速显现试剂及其应用，属于指纹检测技术领域。该基于MOFs前驱体的指纹快速显现试剂由有机羧酸盐溶液与镧系化合物溶液组成。其应用步骤如下：将该MOFs前驱体溶液滴在潜指纹客体表面，30s后，除去多余溶液，可见光下能观察到指纹纹路或紫外灯照射下发出荧光，从而能够清晰地显现出客体表面的潜指纹。本发明具有使用方法简单易行、反应迅速、对使用者的毒副作用小、适应客体广泛以及可通过改变镧系化合物中镧系元素的配比发出不同颜色的荧光以适应不同颜色的客体等优点。
Description
技术领域
本发明涉及指纹检测技术领域，尤其涉及一种基于金属有机框架材料(MOFs)前驱体的指纹快速显现试剂及其应用。
背景技术
指纹具有人各不同、终生不变和触物留痕的特点，指纹鉴定是进行个人识别的最可靠的方法之一，科学正确地发现、提取、显现鉴定指纹对于开展侦查工作、惩治犯罪具有重要的实际作用。
目前应用于现场指纹显现的方法主要有：光学显现法、物理显现法和化学显现法。这些方法主要存在以下两个方面的问题：(1)所用显现试剂对现场勘查人员的身体健康危害较大，粉末(单一粉末、合成粉末、磁性粉末和荧光粉末等)显现试剂、挥发性试剂和溶剂易被吸入；荧光粉末具有强烈的毒性和致癌性，导致技术人员不敢使用。(2)需要使用较多的附件工具和操作，如热熨、热喷雾、蒸气、刷显、熏显、紫外灯等，导致技术人员不愿使用。因此，现场勘查人员对高效便捷、绿色安全的指纹显现新技术、新方法、新产品的需求非常迫切。
发明内容
本发明的目的是克服上述不足之处提供一种基于MOFs前驱体的指纹快速显现试剂，并将其应用于潜指纹的显现。
本发明的目的是通过以下方式实现的：
一种基于MOFs前驱体的指纹快速显现试剂，该试剂由有机羧酸盐溶液与镧系化合物
溶液组成。
上述有机羧酸盐溶液与镧系化合物溶液的摩尔比为(0.5～5):1，优选摩尔比为1:1。
所述的有机羧酸盐为双齿或多齿结构，双齿或多齿结构有机羧酸盐优选对苯二甲酸钠盐或钾盐、2,6-萘二羧酸钠盐或钾盐、1,3,5-三(4-羧基苯基)苯钠盐或钾盐、均苯三甲酸钠盐或钾盐中的一种。
所述的有机羧酸盐溶液浓度为1.0×10-3mol·L-1～25×10-3mol·L-1，所述的镧系化合物溶液的浓度为1.0×10-3mol·L-1～25×10-3mol·L-1。所述的溶液使用的溶剂均为去离子水。
本发明所述的镧系化合物包括镧系氯化物、镧系硝酸盐等。优选镧系化合物为镧系氯化物，镧系氯化物进一步优选EuxTb(1-x)Cl3、EuxTb(1-x)(NO)3(0≤x≤1)中的一种。
上述基于MOFs前驱体的指纹快速显现试剂的制备方法由有机羧酸盐溶液与镧系化合物溶液混合即得。
本发明所述的基于MOFs前驱体的指纹快速显现试剂可在指纹检测中应用。具体步骤为：将有机羧酸盐溶液与镧系化合物溶液按照摩尔比(0.5～5):1混合均匀，制成MOFs前驱体溶液，将MOFs前驱体溶液滴在潜指纹客体表面，30s后，除去多余溶液，可见光下能观察到指纹纹路或紫外灯照射下，发出荧光。
紫外灯波长为254nm或365nm。特别是当有机羧酸盐为对苯二甲酸钠盐或钾盐、均苯三甲酸钠盐或钾盐时，紫外灯为254nm；其余情况下254nm与365nm均可。潜指纹客体为金属、玻璃、塑料、陶瓷、皮革、有机玻璃或漆面。
本发明将有机羧酸盐溶液与镧系化合物溶液混合形成MOFs前驱体，MOFs前驱体与潜指纹中的蛋白质反应，通过仿生矿化沉积在指纹纹线上，可见光下能观察到指纹纹路，而且在紫外灯照射下还能发出荧光，从而能够清晰地显现出客体表面的潜指纹。
而且，本发明可以通过改变EuxTb(1-x)Cl3或EuxTb(1-x)(NO)3中x的值，x可以为0、1、2或3，使指纹发出不同颜色的荧光，从而适应不同颜色的客体。
本发明与现有技术相比具有如下优点：
(1)所采用的试剂均为相应的水溶液，具有无色、无味、水性、绿色安全的特点。
(2)指纹显现过程迅速，显现物质不挥发、不渗透、受客体影响小。
(3)能很好的适应金属、玻璃、塑料、陶瓷、皮革、有机玻璃、漆面等客体表面。
(4)可通过调节镧系化合物中镧系元素的配比达到发出不同颜色荧光的目的，从而适应不同颜色客体的需要。
(5)不完全依赖紫外灯，在可见光下即可观察，紫外灯下更加鲜艳。
附图说明
图1是镧系化合物中镧系元素不同配比(从左至右分别为Eu:Tb＝1:0,3:1,1:1,1:3,0:1)发出不同颜色的图(从左至右分别为：亮红，橘红，暗红，淡黄，翠绿)；
图2是实施例1紫外灯照射下，指纹图样的显现结果；
图3是实施例1可见光下，指纹图样的显现结果；
图4是实施例2紫外灯照射下，指纹图样的显现结果；
图5是实施例3紫外灯照射下，指纹图样的显现结果。
注：指纹鉴定仅需反映出部分指纹特征即可，并不需要完全清晰显现，当然越清晰越易鉴别。
具体实施方式
以下通过具体实施例对本发明进行进一步解释说明：
实施例一
分别移取1mL对苯二甲酸二钠水溶液(2.0×10-3mol·L-1)和1mL氯化铽水溶液(20×10-3mol·L-1)，混合摇匀，用滴管吸取滴在玻璃上的潜指纹表面，30s后，用水冲去多余的MOFs前驱体，可见光下能观察到指纹纹路，且254nm紫外灯照射下，指纹纹路发出绿色的荧光。
实施例二
分别移取8mL 2,6-萘二羧酸钾水溶液(2.5×10-3mol·L-1)和1mL硝酸铕水溶液(20×10-3mol·L-1)，混合，20min后，摇匀，用滴管吸取滴在实验台上的潜指纹表面，30s后，用水冲去多余的MOFs前驱体，可见光下能观察到指纹纹路，且365nm紫外灯照射下，指纹纹路发出红色荧光。
实施例三
分别移取8mL 1,3,5-三(4-羧基苯基)苯钠水溶液(2.5×10-3mol·L-1)和1mL氯化铕水溶液(20×10-3mol·L-1)，混合摇匀，用滴管吸取滴在金属上的潜指纹表面，30s后，用水冲去多余的MOFs前驱体，可见光下能观察到指纹纹路，且254nm紫外灯照射下，指纹纹路发出红色的荧光。
Claims (10)
1.一种基于MOFs前驱体的指纹快速显现试剂，其特征在于该试剂由有机羧酸盐溶液与镧系化合物溶液组成。
2.根据权利要求1所述的基于MOFs前驱体的指纹快速显现试剂，其特征在于有机羧酸盐溶液与镧系化合物溶液的摩尔比为(0.5～5):1。
3.根据权利要求1所述的基于MOFs前驱体的指纹快速显现试剂，其特征在于所述的有机羧酸盐为双齿或多齿结构。
4.根据权利要求3所述的基于MOFs前驱体的指纹快速显现试剂，其特征在于所述的双齿或多齿结构有机羧酸盐为对苯二甲酸钠盐或钾盐、2,6-萘二羧酸钠盐或钾盐、1,3,5-三(4-羧基苯基)苯钠盐或钾盐、均苯三甲酸钠盐或钾盐中的一种。
5.根据权利要求1所述的基于MOFs前驱体的指纹快速显现试剂，其特征在于所述的有机羧酸盐溶液浓度为1.0×10-3mol·L-1～25×10-3mol·L-1，所述的镧系化合物溶液的浓度为1.0×10-3mol·L-1～25×10-3mol·L-1；所述的溶液使用的溶剂均为去离子水。
6.一种基于MOFs前驱体的指纹快速显现试剂的制备方法，其特征在于该试剂由有机羧酸盐溶液与镧系化合物溶液混合即得。
7.一种权利要求1所述的基于MOFs前驱体的指纹快速显现试剂在指纹检测中的应用。
8.根据权利要求7所述的应用，其特征在于将有机羧酸盐溶液与镧系化合物溶液按照摩尔比(0.5～5):1混合均匀，制成MOFs前驱体溶液，将MOFs前驱体溶液滴在潜指纹客体表面，30s后，除去多余溶液，可见光下能观察到指纹纹路或紫外灯照射下发出荧光。
9.根据权利要求8所述的应用，其特征在于紫外灯波长为254nm或365nm。
10.根据权利要求8所述的应用，其特征在于，所述潜指纹客体为金属、玻璃、塑料、陶瓷、皮革、有机玻璃或漆面。
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