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In Situ Scanning Tunneling Microscope of Cyanide and Thiocyanate Adsorption on Pt(111)
Yau, Shueh-Lin,Kim, Youn-Geun,Itaya, Kingo 한국분석과학회 1995 분석과학 Vol.8 No.4
Cyclic voltammetry and in situ STM were employed to examine the interfacial structures of a Pt(111) electrode in 0.1 mM KCN (pH9.5) and 0.1 mM KSCN (pH7) solutions. In situ STM atomic resolution revealed well ordered (2${\surd}$3${\times}$2${\surd}$3)$R30^{\circ}$-6CN and ($2{\times}2$)-2SCN structures within the double layer charging region. Six CN adsorbates formed a hollow hexagon, which embraced a coadsorbed $K^+$ cation. In contrast, the coadsorbed $K^+$ cations on the SCN covered Pt(111) were poorly ordered, despite adsorbed SCN formed a long range ordered ($2{\times}2$)-2SCN adlattice. In situ STM revealed the pronounced influence of potential in controlling the structures of compact layers at the proximity of a Pt electrode. Cathodic polarization facilitated the replacement of the coadsorbed cations by protons.
Mamillapalli, Narendra Chary,Vegiraju, Sureshraju,Priyanka, Pragya,Lin, Chih-Yu,Luo, Xian-Lun,Tsai, Hsiang-Chi,Hong, Shao-Huan,Ni, Jen-Shyang,Lien, Wei-Chieh,Kwon, Guhyun,Yau, Shueh Lin,Kim, Choongik Applied Science Publishers 2017 Dyes and pigments Vol.145 No.-
<P><B>Abstract</B></P> <P>A series of dialkylated tetrathienoacene (<B>TTAR</B>)-based solution-processable small molecular organic semiconductors have been synthesized and characterized for organic field effect transistor (OFET) applications. The central dialkylated <B>TTAR</B> moiety was end-capped with thiophenylvinylthiophene (<B>TVT</B>), bithiophene (<B>bT</B>), and thienothiophene (<B>TT</B>) to afford new π-conjugated p-type active materials, <B>DTVT-TTAR</B> (<B>1</B>), <B>DbT-TTAR</B> (<B>2</B>), and <B>DTT-TTAR</B> (<B>3</B>), respectively. The physical and electrochemical properties and theoretical calculations as well as OFETs performance and thin film morphologies and microstructures of these new soluble <B>TTAR</B>s are systematically studied. Using a solution-shearing method, <B>DTVT-TTAR</B> exhibits p-channel transport with the highest mobility of up to 0.18 cm<SUP>2</SUP> V<SUP>−1</SUP>s<SUP>−1</SUP> and current ON/OFF ratios of 10<SUP>4</SUP>-10<SUP>6</SUP>, which is one of the highest hole mobilities for the solution-processed <B>TTAR</B>-based small molecules.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Synthesis and characterization of dialkylated tetrathienoacene derivatives as semiconductors. </LI> <LI> Various substituents as end groups for solution-processed p-type semiconductors. </LI> <LI> P-type transport with highest mobility up to 0.18 cm<SUP>2</SUP> V<SUP>−1</SUP>s<SUP>−1</SUP>. </LI> <LI> One of the highest mobilities for dialkylated tetratheinoacene derivaties. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Ho, Dongil,Vegiraju, Sureshraju,Choi, Donghee,Cho, Chang-Hui,Kwon, Guhyun,Huang, Po-Chun,Lee, Gene-Hsiang,Earmme, Taeshik,Yau, Shueh Lin,Chen, Ming-Chou,Kim, Choongik Elsevier 2019 Dyes and pigments Vol.163 No.-
<P><B>Abstract</B></P> <P>Solution-processable thioalkylated bithiophene derivatives with different lengths of side chains (<B>SBT-n</B>; <B>n</B> = <B>10</B>, <B>12</B>, <B>14</B>, <B>16</B>, <B>18</B>) have been synthesized and characterized as p-channel organic semiconductors for thin-film transistors (TFTs). Based on a combination of the highest performing SBT derivative (<B>SBT-14</B>) and quinoidals (<B>DTTRQ</B>s) as p- and n-channel materials, solution-processed small-molecular bulk heterojunction (BHJ) ambipolar thin-film transistors were fabricated, and the resulting devices showed air-stable and high ambipolar performance with well-balanced electron and hole mobilities as high as 0.70 cm<SUP>2</SUP> V<SUP>−1</SUP> s<SUP>−1</SUP> and 0.21 cm<SUP>2</SUP> V<SUP>−1</SUP> s<SUP>−1</SUP>, respectively. Furthermore, complementary-like inverters comprising two ambipolar thin-film transistors were demonstrated, which exhibited a high voltage gain of up to 81. Our study clearly demonstrated that side chain engineering of small molecular organic semiconductors had a significant influence on the electrical performance of TFTs and BHJ transistors, as well as complementary-like inverters.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Solution-processable thioalkylated bithiophene derivatives are synthesized. </LI> <LI> Ambipolar transistors are fabricated based on bulk heterojunction small molecules. </LI> <LI> High electrical performance with carrier mobilities of 0.21–0.70 cm<SUP>2</SUP> V<SUP>−1</SUP> s<SUP>−1</SUP> is achieved. </LI> <LI> Complementary-like inverters based on bulk-heterojunction transistors show high transfer gain of 81. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>