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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>
Magnetically Assembled Multisegmented Nanowires and Their Applications
Bangar, Mangesh A.,Hangarter, Carlos M.,Yoo, Bongyoung,Rheem, Youngwoo,Chen, Wilfred,Mulchandani, Ashok,Myung, Nosang V. WILEY-VCH Verlag 2009 Electroanalysis Vol.21 No.1
<P>Here we report a cost effective and versatile way of synthesizing and assembling multi-functional (e.g., gold-polypyrrole-nickel-gold) nanowires. Multisegmented nanowires were synthesized using electrodeposition method for precise control over segment dimensions for proper expression of material functionality. The nanowires were integrated on microfabricated electrodes using magnetic dipole interactions between the ferromagnetic segment in the nanowire and the ferromagnetic electrodes. The electrical properties of multisegmented nanowires showed semiconducting behavior with the activation energy of ca. 0.27 eV for the conducting polymer segment of the nanowire. These nanowire devices showed response towards light and exposure to ammonia, demonstrating their potential use as photonic device and gas sensor, respectively.</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>