中文摘要：

以聚乙烯亚胺（PEI）为修饰剂,采用水热法合成了荧光强度较高、颗粒粒径较小的YVO4∶Eu纳米荧光材料,并讨论了合成该纳米荧光材料的反应机理。通过透射电子显微镜（TEM）、X射线衍射（XRD）、红外光谱（FTIR）、荧光光谱（FS）对纳米荧光材料的粒径形貌、晶体结构、表面官能团、荧光性能进行表征,该纳米荧光材料的粒径尺度约为30nm、形貌为单分散的球形、晶体结构为四方YVO4晶型、其表面为PEI修饰,在254nm紫外光的激发下能够发射出较强的红色荧光。将合成的YVO4∶Eu纳米荧光材料应用于常见光滑客体表面汗潜手印的粉末法显现中,并考详细察了手印显现灵敏度、抗背景颜色干扰能力等因素的影响。实验结果显示,经过YVO4∶Eu纳米荧光材料显现的手印在254nm紫外灯照射下能够发射出明亮的红色荧光,手印纹线清晰连贯、细节特征明显、对比反差强烈、背景干扰较小。与传统的荧光粉末显现法相比,该显现方法具有较高的显现灵敏度和较低的背景干扰。

英文摘要：

YVO4∶Eu fluorescent nanomaterials with small size and strong fluorescent intensity were synthesized via a hydrothermal method by using polyethylenimine（PEI）as the modifier,and the reaction mechanism of this synthesis was also discussed.The as-synthesized nanomaterials were characterized through transmission electron microscopy（TEM）,X-ray diffraction（XRD）measurements,Fourier transform infrared（FT-IR）spectroscopy and fluorescence spectroscopy（FS）.The as-prepared fluorescent nanomaterials were well-dispersed and spherical in shape with an average diameter of about 30 nm,which were modified with a layer of PEI on surfaces.The fluorescent nanomaterials were of pure tetragonal YVO4 structure.They could emit strong red fluorescence under the 254 nm ultraviolet excitation.The YVO4∶Eu fluorescent dry powders were then used as a novel fluorescent label for the development of latent fingerprints on various smooth substrates.Furthermore,the sensitivity and the resistance to background interference in fingerprint development were investigated in detail.The results showed that,use of YVO4∶Eu fluorescent nanomaterials to develop latent fingerprints resulted in clearly defined friction ridge details of fingerprints and eliminated background interference under 254 nm ultraviolet light.Compared with the traditionally used fluorescent developing powders,our YVO4∶Eu fluorescent nanomaterials were a novel agent for latent fingerprint development with high sensitivity,high contrast,and low background interference.