Color tuning of nanofibers by periodic organic-organic hetero-epitaxy.
Color tuning of nanofibers by periodic organic-organic hetero-epitaxy.
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DOI：
10.1021/nn2047235
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发表时间：
2012-06-26
期刊：
影响因子：
17.1
通讯作者：
Sitter H
中科院分区：
文献类型：
--
作者：
Simbrunner C;Hernandez-Sosa G;Quochi F;Schwabegger G;Botta C;Oehzelt M;Salzmann I;Djuric T;Neuhold A;Resel R;Saba M;Mura A;Bongiovanni G;Vollmer A;Koch N;Sitter H
报道了在对六苯基（p-6P）纳米模板上外延生长周期性对六苯基/α-六噻吩（6 T）多层异质结构。通过所选择的方法，6 T分子被迫平行于p-6P模板分子排列，这产生了两种物质的高度偏振的光致发光（PL）发射。PL光谱表明，制造的多层结构提供两个不同的6 T相，界面6 T分子，和三维微晶的光发射。通过周期性地沉积6 T单层和p-6P间隔层，证明了界面6 T的强偏振光谱贡献可以被精确地控制和放大。通过分析两个6 T相的PL发射随p-6P间隔层厚度（Δdp-6P）的变化，我们确定了Δdp-6P = 2.73 nm的临界值，此时界面6 T达到饱和，多余的6 T开始聚集在三维微晶中。这些结果进一步证实了UPS和XRD测量。此外，它是由形态学研究，由扫描力显微镜和荧光显微镜提供的，周期性沉积的6 T和p-6P导致PL-发射和纳米纤维的形态的均匀性的显着改善。结合时间分辨光致发光的光致发光激发实验表明，有机多层纳米纤维的光谱发射主要由从p-6P主机到6 T客人分子的共振能量转移。6 T/p-6P多层结构中6 T发射的敏化时间取决于p-6P间隔层的厚度，并且可以通过有机-有机异质外延获得的主客体分子的良好分离层来解释。纳米纤维的光谱发射和因此的荧光颜色可以从蓝色经由白色有效地调谐到黄绿色光谱范围。
We report on the epitaxial growth of periodic para-hexaphenyl (p-6P)/α-sexi-thiophene (6T) multilayer heterostructures on top of p-6P nanotemplates. By the chosen approach, 6T molecules are forced to align parallel to the p-6P template molecules, which yields highly polarized photoluminescence (PL)-emission of both species. The PL spectra show that the fabricated multilayer structures provide optical emission from two different 6T phases, interfacial 6T molecules, and 3-dimensional crystallites. By a periodical deposition of 6T monolayers and p-6P spacers it is demonstrated that the strongly polarized spectral contribution of interfacial 6T can be precisely controlled and amplified. By analyzing the PL emission of both 6T phases as a function of p-6P spacer thickness (Δdp–6P) we have determined a critical value of Δdp–6P ≈ 2.73 nm where interfacial 6T runs into saturation and the surplus of 6T starts to cluster in 3-dimensional crystallites. These results are further substantiated by UPS and XRD measurements. Moreover, it is demonstrated by morphological investigations, provided by scanning force microscopy and fluorescence microscopy, that periodical deposition of 6T and p-6P leads to a significant improvement of homogeneity in PL-emission and morphology of nanofibers. Photoluminescence excitation experiments in combination with time-resolved photoluminescence demonstrate that the spectral emission of the organic multilayer nanofibers is dominated by a resonant energy transfer from p-6P host- to 6T guest-molecules. The sensitization time of the 6T emission in the 6T/p-6P multilayer structures depends on the p-6P spacer thickness, and can be explained by well separated layers of host–guest molecules obtained by organic–organic heteroepitaxy. The spectral emission and consequently the fluorescent color of the nanofibers can be efficiently tuned from the blue via white to the yellow-green spectral range.
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影响因子：
4.6
作者：
BAKER, KN;FRATINI, AV;FARMER, BL
通讯作者：
FARMER, BL
影响因子：
2.9
作者：
Oehzelt, Martin;Grill, Leonhard;Ramsey, Michael G.
通讯作者：
Ramsey, Michael G.
影响因子：
2.1
作者：
Kankate, L.;Balzer, F.;Rubahn, H. -G.
通讯作者：
Rubahn, H. -G.
影响因子：
3.7
作者：
Shaw, Paul E.;Ruseckas, Arvydas;Samuel, Ifor D. W.
通讯作者：
Samuel, Ifor D. W.
影响因子：
4
作者：
Balzer, F;Bordo, VG;Rubahn, HG
通讯作者：
Rubahn, HG