银纳米颗粒对四苯基卟啉Q带荧光寿命的延长  

Extended Q-band fluorescence lifetime of tetraphenyl porphyrins adsorbed on silver nanoparticles

作　　者：杨振岭[1] 刘玉强[1] 杨延强[1] 

机构地区：[1]哈尔滨工业大学物理系凝聚态科学与技术研究中心,哈尔滨150001

出　　处：《物理学报》2012年第3期469-473,共5页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:20973050);国防基础科研项目(批准号:B1520110002);总装备部预研基金(批准号:9104C6709101106);冲击波物理与爆轰物理国防科技重点实验室基金(批准号:2011-2)资助的课题~~

摘　　要：报道了吸附在银纳米颗粒表面的四苯基卟啉(TPP)的Q带荧光寿命的变化.实验发现将银纳米颗粒的表面等离激元共振吸收峰调至与TPP的Q吸收带共振时,会使FPP的Q带荧光寿命得到延长.这是由于银纳米颗粒对表面的光电场有较大的表面等离激元共振增强效应,而处于激发态的TPP分子有较高的极性,这种增强的光电场会对有较高极性的TPP分子有稳定作用,所以延长了其Q带寿命.这对于以卟啉为光敏剂的光动力治疗有重要的意义.The change of Q-band fluorescence lifetime of tetraphenyl porphyrins（TPP） adsorbed on the surface of silver nanoparticles is reported.The lifetime is extended when the surface plasmon resonant peak of silver nanoparticles is adjusted to be resonant with the Q- absorption band,which is due to the fact that silver nanoparticles bring a large surface plasmon resonant enhancement effect to the surface light field,and the excited TPP molecules have a higher polarity.The enhanced light field will stabilize the TPP molecules of high polarity,which causes the extended Q-band fluorescence lifetime.It has an important significance in photodynamic therapy using porphyrins as photosensitizer.

关 键 词：银纳米颗粒 表面等离激元共振 四苯基卟啉 Q带荧光 

分 类 号：O626[理学—有机化学]