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Tuning the gas sensing performance of single PEDOT nanowire devices
Hangarter, Carlos M.,Hernandez, Sandra C.,He, Xueing,Chartuprayoon, Nicha,Choa, Yong Ho,Myung, Nosang V. Royal Society of Chemistry 2011 The Analyst Vol.136 No.11
<P>This paper reports the synthesis and dopant dependent electrical and sensing properties of single poly(ethylenedioxythiophene) (PEDOT) nanowire sensors. Dopant type (<I>i.e.</I> polystyrenesulfonate (PSS<SUP>−</SUP>) and perchlorate (ClO<SUB>4</SUB><SUP>−</SUP>)) and solvent (<I>i.e.</I> acetonitrile and 1 : 1 water–acetonitrile mixture) were adjusted to change the conjugation length and hydrophilicity of nanowires which resulted in change of the electrical properties and sensing performance. Temperature dependent coefficient of resistance (TCR) indicated that the electrical properties are greatly dependent on dopants and electrolyte where greater disorder was found in PSS<SUP>−</SUP> doped PEDOT nanowires compared to ClO<SUB>4</SUB><SUP>−</SUP> doped nanowires. Upon exposure to different analytes including water vapor and volatile organic compounds, these nanowire devices displayed substantially different sensing characteristics. ClO<SUB>4</SUB><SUP>−</SUP> doped PEDOT nanowires from an acetonitrile bath show superior sensing responses toward less electronegative analytes and followed a power law dependence on the analyte concentration at high partial pressures. These tunable sensing properties were attributed to variation in the conjugation lengths, dopant type and concentration of the wires which may be attributed to two distinct sensing mechanisms: swelling within the bulk of the nanowire and work function modulation of Schottky barrier junction between nanowire and electrodes.</P> <P>Graphic Abstract</P><P>A “tailored-made”-made single PEDOT nanowire gas sensor which displays unique gas sensing behavior due to doping and structural differences arising from electropolymerization conditions. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c0an01000f'> </P>
Nanopeapods by Galvanic Displacement Reaction
Hangarter, Carlos M.,Lee, Young‐,In,Hernandez, Sandra C.,Choa, Yong‐,ho,Myung, Nosang V. WILEY‐VCH Verlag 2010 Angewandte Chemie Vol.122 No.39
<P><B>Eine universelle Strategie</B>: Durch galvanische Verdrängung wurden mehrsegmentige Nanodrähte bei Raumtemperatur in Nanoschoten überführt (siehe Schema). Abhängig vom Redoxpotential des Verdrängungsvorgangs ließen sich verschiedenste Materialien erzeugen, z. B. Halbleiter/Metall‐, p/n‐, Metall/Metall‐ und ferromagnetische/nichtmagnetische Komposite.</P>
Site-Specific Magnetic Assembly of Nanowires for Sensor Arrays Fabrication
Rheem, Y.,Hangarter, C.M.,Eui-Hyeok Yang,Deok-Yong Park,Myung, N.V.,Bongyoung Yoo IEEE 2008 IEEE TRANSACTIONS ON NANOTECHNOLOGY Vol.7 No.3
<P>The effect of variation in local magnetic field on magnetic assembly of 30 and 200 nm diameter Ni nanowires synthesized by template directed electrodeposition was investigated with different materials (Ni-Ni and Ni-Au) and shapes of electrodes. Ni-Au paired electrodes improved confinement of the assembled Ni nanowires across the electrode gap because of the narrower distribution of magnetic field around the gap between the two electrodes. Simulation results indicated a local magnetic field strength at the electrode tip increased by a factor of 2.5 with the use of a needle-shape electrode as compared to rectangular- shape electrode. The resistance of nanowire interconnects increased as the applied voltage was raised, and under the same applied voltage, the increase in resistance is further enhanced at lower temperatures because of higher current density.</P>
Herná,ndez, S. C.,Hangarter, Carlos,Kim, Jong Ryoul,Choa, Yong-Ho,Myung, N. V. The Electrochemical Society 2017 Journal of the Electrochemical Society Vol.164 No.14
<P>Template-directed electrodeposition was utilized to fabricate FexPd1-x nanowires where the dimension was controlled by template pore size (i.e., 30 and 200 nm) whereas the composition was tuned by varying the Fe+2/Pd+2 metal ion ratio in ammonium chloride baths at fixed deposition current density of 5 mA cm(-2). A wide range of composition (i.e., Pd-rich, near equiatomic, and Fe-rich) were successfully fabricated and their magnetic properties were examined. Additionally, single nanowire was also integrated on to microfabricated gold electrodes by magnetic alignment, followed by post-annealing in a reducing environment to make good electrical contacts. Assembled single nanowire was utilized to determine their electrical transport properties including temperature-dependent resistance (TCR) and magnetoresistance (MR). Additionally, the feasibility of FexPd1-x nanowire based hydrogen sensor was examined at room temperature. (c) 2017 The Electrochemical Society.</P>