Thickness-dependent molecular chain and lamellar crystal orientation in ultrathin poly(di-n-hexylsilane) films
文献类型：期刊论文
| 作者 | Hu ZJ ; Huang HY ; Zhang FJ ; Du BY ; He TB |
| 刊名 | langmuir
 |
| 出版日期 | 2004 |
| 卷号 | 20期号:8页码:3271-3277 |
| 关键词 | GLASS-TRANSITION TEMPERATURE THIN POLYMER-FILMS POLY(ETHYLENE OXIDES) QUASI-2 DIMENSIONS OXIDIZED SILICON X-RAY CRYSTALLIZATION MORPHOLOGY ORGANIZATION INTERFACE |
| ISSN号 | 0743-7463 |
| 通讯作者 | he tb |
| 中文摘要 | the molecular chain and lamellar crystal orientation in ultrathin films (thickness < 100 nm) of poly(di-n-hexylsilane) (pdhs) on silicon wafer substrates have been investigated by using transmission electronic microscopy, wide-angle x-ray diffraction, atomic force microscopy, and uv absorption spectroscopy. pdhs showed a film thickness-dependent molecular chain and lamellar crystal orientation. lamellar crystals grew preferentially in flat-on orientation in the monolayer ultrathin films of pdhs, i.e., the silicon backbones were oriented along the surface-normal direction. by contrast, the orientation of lamellar crystals was preferentially edge-on in ultrathin films thicker than ca. 13 nm, i.e., the silicon backbones were oriented parallel to the substrate surface. we interpret the different orientations of molecular chain and lamellar crystal as due to the reduction of the entropy of the polymer chain near the substrate surface and the particularity of the crystallographic (001) plane of flat-on lamellae, respectively. a remarkable influence of the orientations of the silicon backbone on the uv absorption of these pdhs ultrathin films was observed due to the one-dimensional nature of sigma-electrons delocalized along the silicon backbone. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000220750300040 |
| 公开日期 | 2010-08-17 |
| 源URL | [http://ir.ciac.jl.cn/handle/322003/15179]  |
| 专题 | 长春应用化学研究所_长春应用化学研究所知识产出_期刊论文 |
| 推荐引用方式 GB/T 7714 | Hu ZJ,Huang HY,Zhang FJ,et al. Thickness-dependent molecular chain and lamellar crystal orientation in ultrathin poly(di-n-hexylsilane) films[J]. langmuir,2004,20(8):3271-3277. |
| APA | Hu ZJ,Huang HY,Zhang FJ,Du BY,&He TB.(2004).Thickness-dependent molecular chain and lamellar crystal orientation in ultrathin poly(di-n-hexylsilane) films.langmuir,20(8),3271-3277. |
| MLA | Hu ZJ,et al."Thickness-dependent molecular chain and lamellar crystal orientation in ultrathin poly(di-n-hexylsilane) films".langmuir 20.8(2004):3271-3277. |
入库方式： OAI收割
来源：长春应用化学研究所
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