Small-Area, Resistive Volatile Organic Compound (VOC) Sensors Using Metal–Polymer Hybrid Film Based on Oxidative Chemical Vapor Deposition (oCVD)

• DOI: 10.1021/acsami.5b05392
• Publication Date: 2015-07-15T12:40:12Z
• Authors: Xiaoxue Wang; Sichao Hou; Hilal Goktas; Peter Kovacik; Frank Yaul; Arun Paidimarri; Nathan Ickes; Anantha Chandrakasan; Karen Gleason
• Keywords: 02 engineering and technology; 0210 nano-technology

We report a novel room temperature methanol sensor comprised of gold nanoparticles covalently attached to the surface conducting copolymer films. The films are synthesized by oxidative chemical vapor deposition (oCVD), allowing substrate-independent deposition, good polymer conductivity and stability. Two different oCVD copolymers examined: poly(3,4-ethylenedioxythiophene-co-thiophene-3-aceticacid)[poly(EDOT-co-TAA)] poly(3,4-ehylenedioxythiophene-co-thiophene-3-ethanol)[poly(EDOT-co-3-TE)]. Covalent attachment functional groups results in hybrid system with efficient sensing response methanol. poly(EDOT-co-TAA)/Au devices is found be superior that other copolymer, confirming importance linker molecules (4-aminothiophenol) behavior. Selectivity over n-pentane, acetone, toluene demonstrated. Direct fabrication on printed circuit board (PCB) achieved, resulting an improved electrical contact organic resistor metal circuitry thus enhanced properties. simplicity low cost resistive element, mild working temperature, together its compatibility PCB substrates pave way for straightforward integration into electronic devices, such as wireless networks.