Shared posts

12 May 00:00

Rationally synthesized two-dimensional polymers

by John W. Colson

Nature Chemistry. doi:10.1038/nchem.1628

Authors: John W. Colson & William R. Dichtel

Two-dimensional polymers, which exhibit periodic bonding in two orthogonal directions, offer mechanical, electronic and structural properties distinct from their linear or irregularly crosslinked polymer counterparts. Their potential is largely unexplored because versatile and controlled synthetic strategies are only now emerging. This Review describes recent developments in two-dimensional polymerization methods.

02 Jun 00:00

Microstructure formation in molecular and polymer semiconductors assisted by nucleation agents

by Neil D. Treat

Nature Materials. doi:10.1038/nmat3655

Authors: Neil D. Treat, Jennifer A. Nekuda Malik, Obadiah Reid, Liyang Yu, Christopher G. Shuttle, Garry Rumbles, Craig J. Hawker, Michael L. Chabinyc, Paul Smith & Natalie Stingelin

Additives, including nucleating agents, have been used to regulate the solidification process of (semi-)crystalline polymer solids and thus control both their crystallite dimensions and shape. Here, we demonstrate that minute amounts (0.1–1 wt%) of commercially available nucleating agents can be used to efficiently manipulate the solidification kinetics of a wide range of organic semiconductors—including poly(3-alkylthiophene)s, the fullerene derivative [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) and 6,13-bis(triisopropyl-silylethynyl) (TIPS) pentacene—when processed from the melt, solution or solid state, without adversely affecting the semiconductors’ electronic properties. Heterogeneous nucleation increases the temperature of and rate of crystallization of poly(3-alkylthiophene)s, permits patterning of crystallites at pre-defined locations in PCBM, and minimizes dewetting of films of TIPS-pentacene formed by inkjet printing. Nucleating agents thus make possible the fabrication of thin-film transistors with uniform electrical characteristics at high yield.

02 Jun 00:00

Organic semiconductors: Made to order

by Antonio Facchetti

Nature Materials. doi:10.1038/nmat3686

Author: Antonio Facchetti

Fabricating thin films of organic semiconductors that have molecular order across large areas has proved challenging. Now, three complementary approaches — molecular design, fluid-flow control and the use of nucleating agents — offer unprecedented opportunities for next-generation optoelectronic applications.

02 Jun 00:00

Solution coating of large-area organic semiconductor thin films with aligned single-crystalline domains

by Ying Diao

Nature Materials. doi:10.1038/nmat3650

Authors: Ying Diao, Benjamin C-K. Tee, Gaurav Giri, Jie Xu, Do Hwan Kim, Hector A. Becerril, Randall M. Stoltenberg, Tae Hoon Lee, Gi Xue, Stefan C. B. Mannsfeld & Zhenan Bao

25 Jun 19:40

Measurement of the Internal Orbital Alignment of Oligothiophene-TiO2 Nanoparticle Hybrids

by Zhi Li, Harald Berger, Ken Okamoto, Qifeng Zhang, Christine K. Luscombe, Guozhong Cao and Rudy Schlaf

TOC Graphic

The Journal of Physical Chemistry C
DOI: 10.1021/jp401956g