1 Ocak 2018 Dergi makalesi Açık Erişim

Arellano, D. Leonardo Gonzalez; Burnett, Edmund K.; Uzun, Sema Demirci; Zakashansky, Julia A.; Champagne, Victor K., III; George, Michelle; Mannsfeld, Stefan C. B.; Briseno, Alejandro L.

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        "affiliation": "Univ Massachusetts, Dept Polymer Sci & Engn, Amherst, MA 01003 USA", 
        "name": "Arellano, D. Leonardo Gonzalez"
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        "affiliation": "Univ Massachusetts, Dept Polymer Sci & Engn, Amherst, MA 01003 USA", 
        "name": "Burnett, Edmund K."
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      {
        "affiliation": "Univ Massachusetts, Dept Polymer Sci & Engn, Amherst, MA 01003 USA", 
        "name": "Uzun, Sema Demirci"
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      {
        "affiliation": "Univ Massachusetts, Dept Polymer Sci & Engn, Amherst, MA 01003 USA", 
        "name": "Zakashansky, Julia A."
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      {
        "affiliation": "Univ Massachusetts, Dept Polymer Sci & Engn, Amherst, MA 01003 USA", 
        "name": "Champagne, Victor K., III"
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      {
        "affiliation": "Univ Massachusetts, Dept Polymer Sci & Engn, Amherst, MA 01003 USA", 
        "name": "George, Michelle"
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      {
        "affiliation": "Tech Univ Dresden, Ctr Adv Elect Dresden, D-01062 Dresden, Germany", 
        "name": "Mannsfeld, Stefan C. B."
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    "description": "We report on the graphene-assisted growth, crystallization, and phase transition of zinc phthalocyanine (ZnPc) vertically oriented single crystal nanopillars. Postcrystallization thermal annealing of the nanostructures results in a molecular packing change while maintaining the vertical orientation of the single crystals orthogonal to the underlying substrate. Grazing incidence X-ray diffraction and highresolution TEM studies characterized this phase transition from a metastable crystal phase to the more stable beta-phase commonly observed in bulk crystals. These vertical arrays of crystalline nanopillars exhibit a high-surface-to-volume ratio, which is advantageous for applications such as gas sensors. We fabricated chemiresistor sensors with ZnPc nanopillars grown on graphene and demonstrated its selectivity for ammonia vapors, and improvement in sensitivity in the beta-phase crystal packing pillars due to their molecular orientation increasing the exposure of the Zn2+ ion to the ammonia analyte. This work highlights the first morphology-retentive phase transition in organic single crystal nanopillars through simple postprocessing thermal annealing. This study opens up the possibility of molecular packing control without large variations in morphology, a necessity for high-performance devices and establishing structure-property relations.", 
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    "journal": {
      "issue": "26", 
      "pages": "8185-8191", 
      "title": "JOURNAL OF THE AMERICAN CHEMICAL SOCIETY", 
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    "title": "Phase Transition of Graphene-Templated Vertical Zinc Phthalocyanine Nanopillars"
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