TY - JOUR
T1 - High-Density and Monolayer-Level Integration of π-Conjugated Units
T2 - Amphiphilic Carbazole Homopolymer Langmuir-Blodgett Films
AU - Yamamoto, Shunsuke
AU - Nishina, Nanae
AU - Matsui, Jun
AU - Miyashita, Tokuji
AU - Mitsuishi, Masaya
N1 - Funding Information:
We thank Dr. Noboru Ohta (JASRI/Spring-8) for GIXD measurements (2016A1284). The XRR measurements were taken with support from the Tohoku University Material Solutions Center (MaSC). This work was partly supported by Grants-in-Aid for Young Scientists [(B) 26810111] from JSPS and for Scientific Research on Innovative Areas (New Polymeric Materials Based on Element-Blocks, 15H00719) from MEXT and the Murata Science Foundation. The work was also supported by the Research Program of “Dynamic Alliance for Open Innovation Bridging Human, Environment and Materials” in “Network Joint Research Center for Materials and Devices.”
Publisher Copyright:
Copyright © 2018 American Chemical Society.
PY - 2018/9/11
Y1 - 2018/9/11
N2 - Precise integration of π-conjugated units is a key issue to achieve molecular (nano) electronic devices based on organic semiconductor materials. We specifically examine the Langmuir-Blodgett technique, which allows high-density integration of π-conjugated units. In this study, we designed a carbazole containing acrylamide-based homopolymer [poly(9-ethyl-3-carbazolyl acrylamide) (pCzAA)], in which the π-conjugated unit is connected with a hydrophilic amide unit directly as a side chain. Its Langmuir-Blodgett film formation properties were investigated. The pCzAA polymer took a stable monolayer formation in the presence of a small amount (ca. 10 mol %) of poly(N-dodecylacrylamide) (pDDA). Compared with amphiphilic carbazole-containing copolymers described in earlier reports, the direct connection of π-conjugated units through amide bonding enables the Cz content in monolayers to exceed that of the copolymer monolayers (ca. 30 mol %) dramatically. pCzAA:pDDA takes highly ordered layer structures toward the out-of-plane direction, although no structural order is formed in the in-plane direction. This method is a practical means to develop low-dimensional and high-density integration of π-conjugated units for molecular electronics.
AB - Precise integration of π-conjugated units is a key issue to achieve molecular (nano) electronic devices based on organic semiconductor materials. We specifically examine the Langmuir-Blodgett technique, which allows high-density integration of π-conjugated units. In this study, we designed a carbazole containing acrylamide-based homopolymer [poly(9-ethyl-3-carbazolyl acrylamide) (pCzAA)], in which the π-conjugated unit is connected with a hydrophilic amide unit directly as a side chain. Its Langmuir-Blodgett film formation properties were investigated. The pCzAA polymer took a stable monolayer formation in the presence of a small amount (ca. 10 mol %) of poly(N-dodecylacrylamide) (pDDA). Compared with amphiphilic carbazole-containing copolymers described in earlier reports, the direct connection of π-conjugated units through amide bonding enables the Cz content in monolayers to exceed that of the copolymer monolayers (ca. 30 mol %) dramatically. pCzAA:pDDA takes highly ordered layer structures toward the out-of-plane direction, although no structural order is formed in the in-plane direction. This method is a practical means to develop low-dimensional and high-density integration of π-conjugated units for molecular electronics.
UR - http://www.scopus.com/inward/record.url?scp=85052886974&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85052886974&partnerID=8YFLogxK
U2 - 10.1021/acs.langmuir.8b01694
DO - 10.1021/acs.langmuir.8b01694
M3 - Article
C2 - 30146888
AN - SCOPUS:85052886974
VL - 34
SP - 10491
EP - 10497
JO - Langmuir
JF - Langmuir
SN - 0743-7463
IS - 36
ER -