合成了巯基乙酸修饰的CdSe量子点溶液,用荧光光谱法对该材料进行荧光测试,结果表明,该纳米材料在365 nm激发波长下具有优异的荧光性能.用CdSe量子点水溶液对多种深色物体表面上的血手印进行标记并通过CCD相机获取荧光图像.考察标记时间、血液浓度、遗留时间与血手印显像清晰度的关系.结果表明,标记时间为30 min就可以得到理想的荧光图像.该材料应用范围较为广泛,对常见深色物体上的血手印有较好的标记荧光成像效果,灵敏度可以达到1%血浓度.CdSe量子点标记血手印操作简单,适用范围广,荧光亮度高,与背景形成的反差大,获得的荧光图像手印纹线清晰、流畅.
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