Direct-patterned copper/poly(ethylene oxide) composite electrodes for organic thin-film transistors through cone-jet mode by electrohydrodynamic jet printing

Xinlin Li,Hyeok-jin Kwon,Xueqin Zhang,Ho Kwang Choi,Sooman Lim,Tae-Wook Kim,Se Hyun Kim 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.85 No.-

Direct-patterned Cu-based conductive electrodes were printed through electrohydodynamic (EHD) jetprinting via cone-jet mode. The introduction of a capping agent in the synthesis of the Cu ink limitedexcessive conductivity, which enabled the pristine Cu ink to achieve the various printing modes of EHDjet printing: dripping, micro-dripping, cone-jet, and multi-jet. We also obtained optimal printingconditions by adjusting the viscosity by adding poly(ethylene oxide) (PEO) to the pristine Cu inks,resulting in well-defined printing patterns. The optimized PEO content in the ink was determined tobe10 wt%, which gave us a stable cone-jet mode and well-defined Cu/PEO composite electrode lineswith sharp edges. We utilized the Cu/PEO composite electrode lines as source and drain and atriisopropylsilylethynyl (TIPS)–pentacene/PS blend as the active layer for bottom-gate bottom-contactorganicfield-effect transistors (OFETs). The resulting devices exhibited an averagefield-effect mobility(mFET), threshold voltage (Vth), and on/off current ratio (Ion/Ioff) of 0.253 cm2/V, 0.253 V, and106,respectively.

Electrohydrodynamic (EHD) jet printing of carbon-black composites for solution-processed organic field-effect transistors

Li, Xinlin,Go, Myeongjong,Lim, Sooman,An, Tae Kyu,Jeong, Yong Jin,Kim, Se Hyun Elsevier 2019 Organic electronics Vol.73 No.-

<P><B>Abstract</B></P> <P>In this study, carbon-black (CB) conductive electrodes were successfully printed using the high-resolution electrohydrodynamic (EHD) jet printing technique. The wrapping of CB bundles with a polymeric surfactant, Triton X-100 (TX-100), enabled the CB/TX-100 composites to well disperse in ethanol/deionized water for use in the preparation of conductive inks for EHD jet printing. By adjusting the voltage and operation distance, the applied electrostatic and gravity forces to the loaded CB/TX-100 inks overcame the fluid forces (viscosity and surface tension) to elongate the droplet and provide continuous jet lines, where the ink widths were smaller than the diameter of the nozzle. The EHD-printed CB/TX-100 in the stable cone-jet mode formed conductive lines and various pattern shapes. These conductive lines were utilized as source and drain electrodes of organic field-effect transistors (OFETs) with solution-processed organic semiconductors. The OFET with printed CB/TX-100 electrodes exhibited better electrical performances, including a higher saturation mobility and smaller hysteresis, than those of the reference OFET with Au electrodes.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Carbon black/Triton X-100 surfactant composite solutions are prepared for EHD printing. </LI> <LI> CB patterns are successfully printed under stable cone-jet and exhibit good conductivity. </LI> <LI> OFETs with EHD-printed CB exhibited better performances with negligible hysteresis. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

Advanced thin gas barriers film incorporating alternating structure of PEALD-based Al₂O₃/organic-inorganic nanohybrid layers

Jang, Jin Hyuk,Kim, Nahae,Li, Xinlin,An, Tae Kyu,Kim, Juyoung,Kim, Se Hyun Elsevier 2019 APPLIED SURFACE SCIENCE - Vol.475 No.-

<P><B>Abstract</B></P> <P>In this work, we reported excellent plasma-enhanced atomic layer deposition (PEALD)-based Al<SUB>2</SUB>O<SUB>3</SUB>/organic-inorganic (O-I) nanohybrid gas barrier film which exhibits ultralow water vapor transmission rate (WVTR), high activation energy for permeation, high optical transmission in visible light and sufficient flexibility. The values of WVTR and activation energy for permeation of our PEALD-based Al<SUB>2</SUB>O<SUB>3</SUB>/O-I nanohybrid 4 pair gas barrier film are obtained to be 7.83 × 10<SUP>−5</SUP> g/m<SUP>2</SUP>/day (60 °C, 90% RH) and 103.10 kJ/mol via the electrical calcium test. Optical transmission in visible light is 96.14% and critical bending radius 7 mm–9 mm. Introduction of O-I nanohybrid layers between PEALD-based Al<SUB>2</SUB>O<SUB>3</SUB> layers improved the properties of gas barrier films on anticorrosion, adhesion, and flexibility.</P> <P><B>Highlights</B></P> <P> <UL> <LI> We demonstrated excellent Al<SUB>2</SUB>O<SUB>3</SUB>/organic-inorganic (O-I) nanohybrid gas barrier film. </LI> <LI> This barrier film provides good adhesion between O-I nanohybrid and Al<SUB>2</SUB>O<SUB>3</SUB> layers. </LI> <LI> This flexible and transparent film exhibits ultralow WVTR (7.83 × 10<SUP>−5</SUP> g/m<SUP>2</SUP>/day). </LI> </UL> </P>

The effect of surfactants on electrohydrodynamic jet printing and the performance of organic field-effect transistors

Li, Xinlin,Jeong, Yong Jin,Jang, Jaeyoung,Lim, Sooman,Kim, Se Hyun The Royal Society of Chemistry 2018 Physical chemistry chemical physics Vol.20 No.2

<P>In this article, we report on the direct writing of multi-walled carbon nanotube (MWCNT) composite inks based on three different surfactants <I>via</I> the electrohydrodynamic (EHD) jet printing technique. All three surfactants, including two types of polymeric surfactants and an ionic surfactant, successfully dispersed the MWCNTs in the ink medium. Although the MWCNT composite with the ionic surfactant could not be printed by the EHD process, the MWCNT composites with polymeric surfactants could be successfully printed using this technique. Furthermore, the printed lines exhibited different electrical and electronic characteristics, depending on the type of surfactant. A large amount of the poly(4-styrenesulfonic acid) (PSS) surfactant was required to disperse the MWCNTs in ethanol, whereas a smaller amount of polymeric Triton X-100 (TX100) was required to obtain a MWCNT composite suspension in distilled water, and therefore, the printed lines of the latter provided higher conductivities. In addition, the surface potential and charge carrier injection properties of the EHD-printed MWCNT lines depended on the type of surfactant in the MWCNT composite. Finally, organic field-effect transistors (OFETs) employing source/drain electrodes based on MWCNT/surfactant composites exhibited opposing electrical characteristics depending on the type of surfactant. The MWCNT/PSS lines showed excellent electrical performance when used as electrodes in p-type OFETs, whereas the MWCNT/TX100 lines exhibited excellent performance when used as electrodes in n-type OFETs.</P>

Highly stable flexible organic field-effect transistors with Parylene-C gate dielectrics on a flexible substrate

Kwon, Hyeok-jin,Ye, Heqing,An, Tae Kyu,Hong, Jisu,Park, Chan Eon,Choi, Yongseon,Shin, Seongjun,Lee, Jihoon,Kim, Se Hyun,Li, Xinlin Elsevier 2019 Organic electronics Vol.75 No.-

<P><B>Abstract</B></P> <P>Poly(chloro-p-xylene), or Parylene-C, is a polymeric insulating material that has good physical and chemical properties, such as a high dielectric strength, a pin-free surface, and good mechanical/chemical stability, but is difficult to apply to top-contact-structured OFETs since its hydrophobic and very rough surfaces hinder the growth of organic semiconductor crystals and promote the formation of interface traps. Herein, we applied a blend of PS and TIPS-PEN dissolved in 1,2,3,4 tetrahydronaphthalene to overcome these limitations of Parylene-C. To confirm the influence of this system, we analyzed the morphologies of crystals grown on Parylene-C surfaces modified by various organic and polymer materials, including methacryloxypropyltrimethoxysilane, hexamethyldisilazane, and dimethylchlorosilane-terminated polystyrene. Our investigation showed the ability of the PS:TIPS-PEN blend system to be used to overcome the above-described limitations of Parylene-C, and to manufacture top-contact OFETs displaying stable operation under gate-bias stress. Notably, we applied Parylene-C and this blend system in practical flexible OFETs that displayed highly stable properties.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Parylene-C film fabricated by CVD methods is characterized as gate insulating materials. </LI> <LI> Bottom gate top contact OFETs on hard/flexible substrate fabricated with TIPS-PEN: PS blend system and CVD based Parylene-C are reported. </LI> <LI> Morphological structure of TIPS-PEN is investigated using the tools including CPOM, SEM, AFM and 2D-GIXD. </LI> <LI> The OFETs show the mobility of 0.32, and 0.21 cm<SUP>2</SUP>/V in hard and flexible device type with negligible hysteresis both case. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

Identification and functional prediction of long non-coding RNAs related to oxidative stress in the jejunum of piglets

Li Jinbao,Zhang Jianmin,Jin Xinlin,Li Shiyin,Du Yingbin,Zeng Yongqing,Wang Jin,Chen Wei 아세아·태평양축산학회 2024 Animal Bioscience Vol.37 No.2

Objective: Oxidative stress (OS) is a pathological process arising from the excessive production of free radicals in the body. It has the potential to alter animal gene expression and cause damage to the jejunum. However, there have been few reports of changes in the expression of long noncoding RNAs (lncRNAs) in the jejunum in piglets under OS. The purpose of this research was to examine how lncRNAs in piglet jejunum change under OS. Methods: The abdominal cavities of piglets were injected with diquat (DQ) to produce OS. Raw reads were downloaded from the SRA database. RNA-seq was utilized to study the expression of lncRNAs in piglets under OS. Additionally, six randomly selected lncRNAs were verified using quantitative real-time polymerase chain reaction (qRT‒PCR) to examine the mechanism of oxidative damage. Results: A total of 79 lncRNAs were differentially expressed (DE) in the treatment group compared to the negative control group. The target genes of DE lncRNAs were enriched in gene ontology (GO) terms and Kyoto encyclopedia of genes and genomes (KEGG) signaling pathways. Chemical carcinogenesis-reactive oxygen species, the Foxo signaling pathway, colorectal cancer, and the AMPK signaling pathway were all linked to OS. Conclusion: Our results demonstrated that DQ-induced OS causes differential expression of lncRNAs, laying the groundwork for future research into the processes involved in the jejunum’s response to OS.