采用化学有机沉积法，在Ｓｉ（１００）、ＫＢｒ压片及微栅衬底上分别制备了 Ｃ６０／ＰＭＭＡ重量比不同的Ｃ６０－ＰＭＭＡ复合膜．红外光谱分析表明，Ｃ６０分子已均匀地分布在Ｃ６０－ＰＭＭＡ复合膜中．利用Ｘ射线衍射（ＸＲＤ）谱和透射电子显微镜（ＴＥＭ）研究了该复合膜的结构，结果显示原来均匀分布在ＰＭＭＡ中的Ｃ６０分子经过扩散趋向于形成非晶或晶化的Ｃ６０颗粒．经过退火，以面心立方结构单晶形式存在的Ｃ６０颗粒的尺寸为３０～１００ｎｍ，且以规则的几何形体分散在ＰＭＭＡ连续相中．玻耳兹曼能量分布规律能够较好地解释，提高Ｃ６０含量或退火温度，晶化Ｃ６０颗粒尺寸增大的现象．
C60-polymethyl methacylate (PMMA) composite films were prepared by the chemical organic deposition method with the different weight ratios C60 to
PMMA. The measurements of Fourier transform infrared (FTIR) spectra for the as-prepared films show that C60 molecules are embedded into PMMA. X-ray diffraction
(XRD) and transmission electron microscope (TEM) were employed to study the structures of the films. The measurement results suggest that C60 molecules
in the films tend to aggregate each other and to form some tiny C60 crystallites due to the increase in the C60 content. TEM observition shows that regular
C60 crystallites of about 30-100nm are distributed homogeneously in the PMMA film. The selective area diffraction indicates that the crystallized
particles in the films are single crystal ones with fcc structure. The theory of Boltzmann distribution well explains the phenomenon that C60
crystallite size increases with increasing C60 content or annealed at enhanced temperature.
参考文献
| [1] | Kroto H W, Heath J R, O’Brin S C, et al. Nature, 1985, 318: 162--163. [2] Kratscher W, LambL, Fostiropoulos D K, et al. Nature, 1990, 347: 354--358. [3] Rice M J, Gartstein Y N. Phys. Rev., 1996, B53: 10764--10768. [4] Wang Y. Nature, 1992, 356(3): 585--587. [5] Wang D Z, Jian Z, Zhang Q J, et al. J. Appl. Phys., 1997, 81: 1413--1415. [6] Kost A, Tutt L, Klein M B, et al. Opt. Lett., 1993, 18(5): 334--336. [7] Ma G B, Yang Y H, Chen G H. Mater. Lett., 1998, 34: 377--382. [8] Mitch M G, Chase S J, Lannin J S. Phys. Rev. Lett., 1992, 68: 883--887. [9] Heiney P A, Fischer J E, Romanow W J. Phys. Rev. Lett., 1991, 66: 2911--2914. [10] Chen G H, Ma G B. Appl. Phys. Lett., 1998, 72(25): 3294--3296. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%