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MEMS sensor material based on polypyrrole carbon nanotube nanocomposite: film deposition and characterization

MEMS sensor material based on polypyrrole carbon nanotube nanocomposite: film deposition and characterization,10.1088/0960-1317/15/11/005,Journal of M

MEMS sensor material based on polypyrrole carbon nanotube nanocomposite: film deposition and characterization   (Citations: 10)
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Conductive polymer-based nanocomposite has been utilized as a MEMS sensing material via a one-step, selective on-chip deposition process at room temperature. A doped polypyrrole (PPy) variant synthesized by incorporating multi-walled carbon nanotube (MWCNT) into electropolymerized PPy has been shown to improve the sensing performance utilizing a two-terminal, micro-gap chemiresistor architecture. The dodecylbenzenesulfonate (DBS)-doped PPy-MWCNT nanocomposites are found to be responsive to oxidants, such as hydrogen peroxide (H2O2), and this effect can be extended to glucose detection using H2O2 as a proxy material. The oxidant sensing effect is demonstrated by subjecting a glucose oxidase (GOx)-laden PPy-MWCNT nanocomposite film to various concentrations of glucose solution. Such PPy-MWCNT nanocomposite, when applied in a chemiresistor configuration, obviates the need for reference electrode and electron mediators, by measuring the direct and reversible, oxidation-reduction induced conductivity change. Experimentally, GOx-laden, doped PPy-MWCNT is tested to be sensitive to glucose concentration up to 20 mM, which covers the physiologically important range for diabetics of 0-20 mM.
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    • ...Doped PPy film is synthesized via an electropolymerization process that was described elsewhere previously [11]...

    K. S. Tehet al. Surface nanostructuring of biocompatible polymer for wettability contr...

    • ...We synthesize doped polypyrrole using an electropolymerization process that was previously developed [9]...

    Kwok Siong Tehet al. Topography and wettability control in biocompatible polymer for BioMEM...

    • ...Onesuchnanostructure, thecarbon nanotube (CNT), hascontinually beenthesubject ofintense research for integrated sensors, field-effect devices, and composite materials amongotherapplications [4-6].As such, the synthesis ofCNTshascontinually beenstudied...
    • ...Thecomplete system modeloftheinduction coil usedin this workmaythenbesimplified andrepresented asaseries of rings ofpitch, 6,withagapofaatthecenter ofthecoil, as showninFigure 3b.Since themagnetic field issymmetric at thecenter ofthecoil withrespect totheplane normal tothe coil axis, bysetting theorigin ofz-axis atthecenter ofthe coil, thegenerated EMF maybecalculated astheseries ofthe contributions fromtheupperandlower sets ofinduction ...
    • ...Along theaxis ofthe coil, however, themaximumvalue ofthenormalized EMF is notatthecenter ofthecoil, butrather, wascalculated tobe 6.55mmbelowthecoil center along thecoil axis.Thisis because ofthegapinthecoil usedforthis work.Incidentally, byreducing thegaptozero, themaximumvalue oftheEMF approaches thecenter ofthecoil, whereas increasing thegap infinitely, causes themaximumvaluetoasymptotically approach thecenter ofthelower ...
    • ...Figure 5ashowsa schematic representation ofthefour different coil positions that wereexamined at0,6.5, 13,and 19.5mmalong theaxisofthecoil, whichrepresent equally spaced distances between thecoil center ("C"), thelocation in thelowersection ofthecoil atthepeakEMF generation calculated fromequation (4)("LC1"), aposition lower inthe coil ("LC2"), andthebelow thecoil base("B"), respectively...
    • ...1300 1500 A Test 6 Radius: 300pm...
    • ...Figure 6.a)Overview ofchipwithseveral copper microfabricated rings...

    Brian D. Sosnowchiket al. Chip-Scale Localized Synthesis of Carbon Nanotubes on Copper Microstru...

    • ...H2, CO, glucose, and DNA [5, 6]. Recent study demonstrates that CNT-modified electrodes can greatly enhance the performance of electrochemical amperometric biosensors [7]...

    Wei Xueet al. A high-resolution amperometric acetylcholine biosensor based on nano s...

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