Visible Light-Induced Electron Transfers in Titania Nanosheet and Mesoporous Silica Integrated Films
Visible Light-Induced Electron Transfers in Titania Nanosheet and Mesoporous Silica Integrated Films
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DOI：
10.1246/bcsj.79.386
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发表时间：
2006-03
影响因子：
4
通讯作者：
Tatsuto Yui;Takako Tsuchino;Kosho Akatsuka;A. Yamauchi;Yuka Kobayashi;T. Hattori;M. Haga;K. Takagi
中科院分区：
文献类型：
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作者：
Tatsuto Yui;Takako Tsuchino;Kosho Akatsuka;A. Yamauchi;Yuka Kobayashi;T. Hattori;M. Haga;K. Takagi
两种空间结构不同的无机纳米材料，二氧化钛纳米片（TNS）和介孔二氧化硅（MPS）。集成到玻璃衬底上以形成堆叠的复合薄膜。研究了四（1-甲基吡啶-4-基）卟啉金属（4+）离子（[M-（tmpyp）] ++; M = H2，Zn，Co）与1，1 '-二甲基-4.4'-联吡啶（甲基紫精; MV 2+）在杂化膜中的光诱导电子转移.发现[M（tmpyp）] 4+分子仅吸附在MPS纳米腔中，而MV 2+仅插入TNS层中，即，[M（tmpyp）] 4+和MV 2+分子可分别选择性地进入杂化膜的MPS纳米腔和TNS层。在紫外光照射（TNS激发）下，[H2（tmpyp）] 4+的分解和单电子还原的MV 2+（MV +·）的形成，表明MPS/TNS膜中存在光诱导电子转移.此外，当用金属配合物[Zn（tmpyp）] 4+或[co（tmpyp）] +代替[H2（tmpyp）] 4+时，在本发明的MPS/TNS杂化膜中可以观察到可见光诱导的电子转移，这是在连续堆叠的薄膜中通过可见光进行这种电荷分离的首次报道。
Two spatially different nano-structured inorganic materials, titania nanosheets (TNS) and mesoporous silica (MPS). were integrated onto a glass substrate to form stacked composite thin films. Investigations were then carried out on photoinduced electron transfers between the tetrakis(1-methylpyridinium-4-yl)porphyrinatomelal(4+) ion ([M-(tmpyp)] ++ ); M = H 2 , Zn, and Co) and 1,1'-dimethyl-4.4'-bipyridinium (methyl viologen; MV 2+ ) within the hybrid films. The [M(tmpyp)] 4+ molecules were found to be adsorbed only in the MPS nano-cavities, while MV 2+ was intercalated only in the TNS layer, i.e., the [M(tmpyp)] 4+ and MV 2+ molecules could he separately and selectively accommodated into the MPS nano-cavities and TNS layers of the hybrid films, respectively. Upon UV light irradiation (TNS excitation) of the films containing [H 2 (tmpyp)] 4+ , the decomposition of [H 2 (tmpyp)] 4+ and the formation of a one-electron reduced MV 2+ (MV +• ) were observed, clearly indicating photoinduced electron transfers in the MPS/TNS films. Moreover, when the metal-complex [Zn(tmpyp)] 4+ or [co(tmpyp)] + was used in place of [H 2 (tmpyp)] 4+ , visible light-induced electron transfers could be observed in the present MPS/TNS hybrid film, the first report of such charge separation in consecutively stacked thin films by visible light.