Photosensitization of nanoporous TiO2 electrodes with InP quantum dots
Photosensitization of nanoporous TiO2 electrodes with InP quantum dots
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DOI：
10.1021/la9713863
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发表时间：
1998-05
期刊：
影响因子：
3.9
通讯作者：
A. Zaban;O. Mićić;A. B. T. Gregg;A. Nozik
中科院分区：
文献类型：
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作者：
A. Zaban;O. Mićić;A. B. T. Gregg;A. Nozik
InP的量子点（QD）强烈吸附在通过烧结直径为200 - 250 A的TiO 2胶体颗粒制备的透明多孔纳米晶TiO 2电极上。TiO 2电极的颗粒间空间足够大，以允许65-A InP QD深入渗透到多孔TiO 2膜中。光的吸收随TiO 2膜的厚度线性增加，表明InP量子点均匀地吸附在TiO 2表面。我们发现大颗粒比小颗粒吸附得更好，这可能是由于稳定剂的阻碍较小。该固体膜在可见光区表现出很强的光电导性，表明InP量子点对TiO 2具有光敏化作用。在+1 V电位下，TiO 2/InP量子点薄膜的光电流作用谱与InP量子点的吸收谱一致。将p型InP量子点负载在TiO 2上，浸渍在I-/I3-或氢醌/醌乙腈溶液中，形成光电化学电池，Pt对电极。
Quantum dots (QDs) of InP strongly adsorb onto transparent, porous, nanocrystalline TiO2 electrodes prepared by sintering 200−250 A diameter TiO2 colloidal particles. The interparticle space of the TiO2 electrodes is large enough to permit deep penetration of 65-A InP QDs into the porous TiO2 film. The absorption of light increases linearly with the thickness of the TiO2 film indicating that the InP QDs are adsorbed homogeneously on the TiO2 surface. We found that large particles adsorb better than smaller ones probably due to less hindrance by the stabilizer. The solid films exhibit strong photoconductivity in the visible region indicating photosensitization of TiO2 by InP QDs. The photocurrent action spectrum of the TiO2/InP QD film at a potential of +1 V is consistent with the absorption spectrum of the InP QDs. A photoelectrochemical cell was formed that consisted of p-type InP QDs loaded on TiO2, which was immersed in a I-/I3- or hydroquinone/quinone acetonitrile solution, and a Pt counter electrode....