Photoelectrochemical Responses from Zinc Porphyrin-Silver Nanoparticle Composite Films Fabricated
Photoelectrochemical Responses from Zinc Porphyrin-Silver Nanoparticle Composite Films Fabricated
复制标题
锌卟啉-银纳米粒子复合薄膜的光电化学响应
DOI：
10.1021/jp306313w
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发表时间：
2013
影响因子：
3.7
通讯作者：
Ryuji Matsumoto et al
中科院分区：
文献类型：
--
作者：
Mizukoshi;Y.; Yamamoto;T. A.;Ryuji Matsumoto et al
采用静电逐层吸附技术在氧化铟锡（ITO）电极上制备四苯基锌卟啉（ZnTPP）-银纳米颗粒（AgP）复合薄膜。通过改变AgPs胶体水溶液的浸泡时间，可以控制AgPs在ITO电极上的固定程度。当将最佳量的 AgP 沉积到 ITO 电极上分别进行光电流和荧光测量时，观察到光电流作用光谱以及荧光发射光谱的最大增强。 AgP对光电流和荧光的影响表明局域表面等离子体共振产生的增强电场对光电流和荧光信号的增强有影响。 AgP对ZnTPP（1ZnTPP*）单重激发态寿命的影响表明，1ZnTPP*的寿命在浸泡时间为6小时时变短。荧光寿命的结果表明，AgP 对光电流和荧光的影响的差异很可能归因于在光电流测量中，AgP 聚集体从 1ZnTPP* 到表面等离子体的能量转移与从 1ZnTPP* 到 O2 的光致电子转移竞争。
The fabrication of zinc tetraphenyl porphyrin (ZnTPP)–silver nanoparticle (AgP) composite films on indium–tin-oxide (ITO) electrodes were carried out by the electrostatic layer-by-layer adsorption technique. The degree of immobilization of AgPs on the ITO electrodes could be controlled by changing the immersion time into the aqueous colloidal solution of AgPs. Maximum enhancement in the photocurrent action spectra as well as the fluorescence emission spectra was observed when optimum amounts of AgP were deposited onto the ITO electrode for the photocurrent and the fluorescence measurements, respectively. Effect of AgP on the photocurrent and the fluorescence suggested the effects of enhanced electric fields resulting from the localized surface plasmon resonance on the enhancement of photocurrent and fluorescence signals. The effect of AgP on the lifetime of the singlet excited state of ZnTPP (1ZnTPP*) indicated that the lifetime of1ZnTPP* becomes shorter at an immersion time of 6 h. The results of the fluorescence lifetime suggested that the difference of effects of AgP on the photocurrent and the fluorescence is most likely ascribed by that the energy-transfer from1ZnTPP* to surface plasmon due to AgP aggregates is competitive with the photoinduced electron-transfer from1ZnTPP* to O2in the photocurrent measurements.