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Alkyl chain length dependence of the device properties containing new anthracene derivatives
백장열,김윤희,조철성,박광훈,박성종,안은수 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.0
We report six asymmetric alkylated anthracenebased molecules with different alkyl side chain lengths for use in organic field-effect transistors (OFETs). Alkyl side chains can potentially improve the solubility and processability of anthracene derivatives. The crystallinity and charge mobility of the anthracene derivatives may be improved by optimizing the side chain length. The moderate side chain length appeared to be optimal for promoting selforganization among asymmetric anthracene derivatives in OFETs, and was certainly better than the short or long alkyl side chain lengths, as confirmed by X-ray diffraction measurements.
Alkyl Chain Length Dependence of the Field-Effect Mobility in Novel Anthracene Derivatives
Back, Jang Yeol,An, Tae Kyu,Cheon, Ye Rim,Cha, Hyojung,Jang, Jaeyoung,Kim, Yebyeol,Baek, Yonghwa,Chung, Dae Sung,Kwon, Soon-Ki,Park, Chan Eon,Kim, Yun-Hi American Chemical Society 2015 ACS APPLIED MATERIALS & INTERFACES Vol.7 No.1
<P>We report six asymmetric alkylated anthracene-based molecules with different alkyl side chain lengths for use in organic field-effect transistors (OFETs). Alkyl side chains can potentially improve the solubility and processability of anthracene derivatives. The crystallinity and charge mobility of the anthracene derivatives may be improved by optimizing the side chain length. The highest field-effect mobility of the devices prepared here was 0.55 cm<SUP>2</SUP>/(V s), for 2-(<I>p</I>-pentylphenylethynyl)anthracene (PPEA). The moderate side chain length appeared to be optimal for promoting self-organization among asymmetric anthracene derivatives in OFETs, and was certainly better than the short or long alkyl side chain lengths, as confirmed by X-ray diffraction measurements.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/aamick/2015/aamick.2015.7.issue-1/am5063103/production/images/medium/am-2014-063103_0011.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/am5063103'>ACS Electronic Supporting Info</A></P>
Manli Li,Enqi Jin,Zhiyong Qiao,Rongli Zhao 한국섬유공학회 2018 Fibers and polymers Vol.19 No.3
In order to study the effects of alkyl chain length of aliphatic dicarboxylic ester (ADE) monomers on enzymatic and hydrolytic degradation properties of aliphatic-aromatic water-soluble copolyesters for warp sizing, dimethyl terephthalate, dimethyl isophthalate-5-sulfonic sodium, and ADE monomers with various alkyl chain lengths were copolymerized through a two-step method, i.e. transesterification and polycondensation. The enzymatic and hydrolytic degradation properties of the copolyesters were studied in terms of reduction rates of molecular weight, glass transition temperatures, and surface morphology after being cultivated for 24-96 h. It was found that, enzymatic degradation of the copolyesters strongly depended on alkyl chain length of ADE monomers. After being enzymatically degraded for 96 h, reduction rate of molecular weight of the copolyester using dimethyl malonate as ADE monomers could reach 22.2 %. Meanwhile, the hydrolytic degradation of the copolyesters was not directly related to the alkyl chain length.
진호철,김주현,정미진,이준호,( Sabrina Aufar Salma ),( Ratna Dewi Maduwu ) 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
For high-efficiency organic solar cells, it is a required condition that photogenerated electrons move smoothly to the cathode. This can be achieved by introducing electrolytes into the cathode buffer layer (CBL). Using structural flexibility of organic electrolytes, we investigated the alkyl chain length’s effect about the solar cell efficiency based on fixed core structure, alkyl-quaternized bipyridine with tosylate. The organic electrolytes were named V-C4-OTs, V-C6-OTs, and V-C12-OTs, respectively. Power conversion efficiency (PCE) and incident photonto- electron conversion efficiency (IPCE) were investigated with the device structure of ITO/ZnO/CBL/Aactive/MoO<sub>3</sub>/Ag. Work function was also investigated using Kelvin probe microscopy (KPM) measurements. The improved PCE and IPCE were induced by enhancement of the photogenerated current density, which be matched with decrease of a Schottky barrier well.
알킬 사슬 길이에 따른 러빙 처리된 자기 조립 단분자막의 액정 배향 연구
박홍규(Hong-Gyu Park),박무훈(Mu-Hun Park) 한국정보전자통신기술학회 2021 한국정보전자통신기술학회논문지 Vol.14 No.5
본 논문에서는 알킬 사슬 길이에 따른 러빙 처리된 불소화 자기 조립 단분자막(fluorinated self-assembled monolayers; FSAM)의 수직 액정 배향 상태를 보고한다. FSAM의 증착을 위해 간단한 공정인 기체-상 방법이 사용되었다. FSAM의 가시광선 영역대 광학 평균 투과율은 77.63%~78.21%로 75.89%의 투과율을 갖는 기존의 폴리이미드 막보다 우수하였다. 또한 프리틸트각 측정과 편광현미경 사진을 통해 FSAM의 우수한 수직 배향 특성을 관찰하였다. 접촉각과 FSAM의 표면에너지 측정을 통해 알킬 사슬 길이에 따른 프리틸트각이 증가하는 것을 확인하였다. FSAM의 높은 광학 투과율과 균일한 수직 배향 특성은 FSAM이 액정 배향막으로서의 가능성을 보여주었다. A homeotropic liquid crystal (LC) alignment state on rubbed fluorinated self-assembled monolayers (FSAMs) is described according to alkyl chain length. A simple procedure, gas-phase method, for the preparation of FSAM was used. The average optical transmittance in the visible light range of FSAMs were 76.63% to 78.21%, which were superior to the conventional polyimide layer having a transmittance of 75.89%. In addition, the excellent homeotropic LC alignment characteristics of FSAMs were observed through pretilt angle measurement and polarized optical microscope images. By measuring the contact angles and the surface energies of FSAMs, it was confirmed that pretilt angles of LC molecules increased according to the alkyl chain length. High optical transparency and uniform homeotropic LC alignment characteristics of FSAMs showed the possibility of FSAMs as an LC alignment layers.
Synthesis of cardanol-like antibacterial polymer with various alkyl chain length
이시영,김진석,육진솔,이종찬 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
Cardanol extracted from cashew nut shell liquid is a well known material for antibacterial activity. In fact, cardanol exhibited excellent antibacterial property when it used as side chain attached to the polymer backbone. However, the antibacterial mechanism of cardanol is still obscure. To investigate the effect of long alkyl chain moiety in the cardanol, phenol with various lengths of alkyl chain (C6, C8, C10, C12, C16) was synthesized via Williamson ether synthesis, which is further reacted with glycidyl methacrylate for introduction of acylate backbone. Polymers having silliar structure with cardanol was synthesized and characterized by NMR,IR, GPC and TGA. Also, the antibacterial activity was confirmed by colony counting method and polymer having C12 alkyl chain showed the highest activity with 99.9% killing rate.
Song, Chang Eun,Kim, Yu Jin,Suranagi, Sanjaykumar R.,Kini, Gururaj P.,Park, Sangheon,Lee, Sang Kyu,Shin, Won Suk,Moon, Sang-Jin,Kang, In-Nam,Park, Chan Eon,Lee, Jong-Cheol American Chemical Society 2016 ACS APPLIED MATERIALS & INTERFACES Vol.8 No.20
<P>A series of small compound materials based on benzodithiophene (BDT) and diketopyrrolopyrrole (DPP) with three different alkyl side chains were synthesized and used for organic photovoltaics. These small compounds had different alkyl branches (i.e., 2-ethylhexyl (EH), 2-butyloctyl (BO), and 2-hexyldecyl (HD)) attached to DPP units. Thin films made of these compounds were characterized and their solar cell parameters were measured in order to systematically analyze influences of the different side chains of compounds on the film microstructure, molecular packing, and hence, charge-transport and recombination properties. The relatively shorter side chains in the small molecules enabled more ordered packing structures with higher crystallinities, which resulted in higher carrier mobilities and less recombination factors; the small molecule with the EH branches exhibited the best semiconducting properties with a power conversion efficiency of up to 5.54% in solar cell devices. Our study suggested that tuning the alkyl chain length of semiconducting molecules is a powerful strategy for achieving high performance of organic photovoltaics.</P>
Association of alkyl chain length in the Electrolytes with the Photovoltaic Properties
진호철,정미진,이준호,( Sabrina Aufar Salma ),( Ratna Dewi Maduwu ),손동환,김주현 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
It is a requirement for high-performance bulk-heterojunction organic solar cells to investigate the interfacial effect on photogenerated holes and electrons transfer. As it is known, the smooth transfer can be achieved by decreasing the Schottky barrier. Herein, we investigated the association of alkyl chain length in the electrolytes, 1,1'-bis(1-alkyl)-4,4′-bipyridine-1,1′-diium benzenesulfonate (V-butyl-2OTs, V-hexyl-2OTs, and V-dodecyl-2OTs). The power conversion efficiencies (PCEs) and the Schottky barrier of the electrolytes were calculated to 8.1%/0.37, 8.3%/0.30, and 8.6%/0.23, respectively, where the Schottky barrier was induced from the difference between acceptor material’s LUMO and electrode. The obvious correlation was found between the PCE and the Schottky barrier. The photogenerated current density which well-matched with the decreasing of the Schottky barrier by the interfacial dipole from the electrolytes become the main reason of the enhancement of the PCEs.
Sunesh, Chozhidakath Damodharan,Mathai, George,Choe, Youngson American Chemical Society 2014 ACS APPLIED MATERIALS & INTERFACES Vol.6 No.20
<P>A series of cationic iridium complexes (<B>1</B>–<B>6</B>) were synthesized using alkylated imidazole-based ancillary ligands, and the photophysical and electrochemical properties of these complexes were subsequently evaluated. Light-emitting electrochemical cells (LECs) were fabricated from these complexes, and the effects of the alkyl chain length on the electroluminescent properties of the devices were investigated. The LECs based on these complexes resulted in yellow emission (complexes <B>1</B>, <B>3</B>, and <B>5</B>) and green emission (complexes <B>2</B>, <B>4</B>, and <B>6</B>) with Commission Internationale de L’Eclairage (CIE) coordinates of (0.49, 0.50) and (0.33, 0.59), respectively. Our results indicate that the luminance and efficiency of the LECs can consistently be enhanced by increasing the alkyl chain length of the iridium complexes as a result of suppressed intermolecular interaction and self-quenching. Subsequently, a high luminance of 7309 cd m<SUP>–2</SUP> and current efficiency of 3.85 cd A<SUP>–1</SUP> were achieved for the LECs based on complex <B>5</B>.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/aamick/2014/aamick.2014.6.issue-20/am5058426/production/images/medium/am-2014-058426_0009.gif'></P>