Novel Synthesis of the TiO2(B) Multilayer Templated Films
Novel Synthesis of the TiO2(B) Multilayer Templated Films
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DOI：
10.1021/cm801819q
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发表时间：
2009-04-28
影响因子：
8.6
通讯作者：
Graetzel, Michael
中科院分区：
文献类型：
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作者：
Prochazka, Jan;Kavan, Ladislav;Graetzel, Michael
在掺F的SnO 2导电玻璃衬底上，分两步制备了TiO 2（B）介孔薄膜。在第一步中，将少量的H3 PO 4（对应于基于TiO 2的0.15-0.375重量% P）引入浓HCl中，随后将其用于乙醇钛的水解。将水解的胶态TiO 2悬浮液进一步与两亲性三嵌段共聚物Pluronic P123的1-丁醇溶液混合。将所获得的前体混合物用于FTO基底的浸涂。为了获得超过1 μ m厚的膜，将浸涂（随后在350 ℃/2小时下热处理）重复数次以产生多层膜。薄膜由无定形TiO 2和少量TiO 2（B）组成。在500-550 ℃的简单烧制步骤中将非晶部分转化为TiO 2（B）。TiO 2（B）相的形成伴随着薄膜厚度的显著增加。该膜在电化学锂插入期间表现出独特的行为，这将使它们有资格用于快速电池或电致变色智能窗应用。染料敏化太阳能电池中多相TiO 2薄膜的效率取决于单个薄膜的组成：它在以下系列中增加：TiO 2/非晶TiO 2 <TiO 2/TiO 2（B）<TiO 2。
TiO2(B) mesoporous thin films were grown in two steps on the F-doped SnO2 conductive glass substrates. In the first step, a small amount of H3PO4, corresponding to 0.15-0.375 wt % P on TiO2 basis, was introduced into concentrated HCl which was subsequently used for hydrolysis of titanium ethoxide. The hydrolyzed colloidal TiO2 Suspension was further mixed with a 1-butanol solution of the amphiphilic triblock copolymer Pluronic P123. The obtained precursor mixture was used for dip coating of FTO substrates. To achieve over 1 mu m thick films, dip coating (followed by a thermal treatment at 350 degrees C/2 h) was repeated several times to produce multilayer films. The films consisted of amorphous TiO2 with small amounts of anatase and TiO2(B). The amorphous part was converted into the TiO2(B) in a simple firing step at 500-550 degrees C. The formation of TiO2(B) phase was accompanied by a significant increase of the film thickness. The films demonstrated unique behavior during the electrochemical lithium insertion that would qualify them for fast battery or electrochromic smart window applications. The efficiency of multiphase TiO2 films in dye sensitized solar cells depends on the composition of individual films: it increases in the series: anatase/ amorphous TiO2 < anatase/TiO2(B) < anatase.