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 | 2004-04-13 |
| 卷号 | 20期号:8页码:3271-3277 |
| ISSN号 | 0743-7463 |
| DOI | 10.1021/la036033k |
| 英文摘要 | 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. With the silicon backbones perpendicular or parallel to the surface of the substrate, the UV absorbance increased or decreased with an increase of the angle between the incident UV beam direction and direction normal to the thin film, respectively. |
| 语种 | 英语 |
| WOS记录号 | WOS:000220750300040 |
| 出版者 | AMER CHEMICAL SOC |
| 源URL | [http://ir.iccas.ac.cn/handle/121111/55255]  |
| 专题 | 中国科学院化学研究所 |
| 通讯作者 | He, TB |
| 作者单位 | Chinese Acad Sci, Changchun Inst Appl Chem, State Key Lab Polymer Phys & Chem, Changchun 130022, Peoples R China |
| 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：化学研究所
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