【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.更多还原

【Abstract】 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.更多还原