Atomic Imaging of the Irreversible Sensing Mechanism of NO Adsorption on Copper Phthalocyanine.
Ambient NO adsorption onto copper(II) phthalocyanine (CuPc) monolayers is observed using ultrahigh vacuum (UHV) scanning tunneling microscopy (STM) to elucidate the molecular sensing mechanism in CuPc chemical vapor sensors. For low doses (1 ppm for 5 min) of NO at ambient temperatures, isolated che...
| Publicado en: | Journal of the American Chemical Society Vol. 135; no. 39; pp. 14600 - 14610 |
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| Autores principales: | , , , , , , , , |
| Formato: | Artículo |
| Publicado: |
American Chemical Society
10/2/2013
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| Materias: | |
| Acceso en línea: | Ver este registro en EBSCOhost |
| fields | @attributes: recordID: 1 pdfLink: plink: https://search.ebscohost.com/login.aspx?direct=true&db=hlh&AN=90641312&site=ehost-live header: @attributes: shortDbName: hlh uiTerm: 90641312 longDbName: Humanities International Complete uiTag: AN controlInfo: bkinfo: jinfo: jid: 00027863 ACS jtl: Journal of the American Chemical Society issn: 00027863 maglogo: N pubinfo: dt: 10/2/2013 vid: 135 iid: 39 pid: 997 pub: American Chemical Society artinfo: ui: 90641312 10.1021/ja403752r ppf: 14600 ppct: 10 formats: tig: atl: Atomic Imaging of the Irreversible Sensing Mechanism of NO Adsorption on Copper Phthalocyanine. aug: au: Jun Hong Park Royer, James E. Chagarov, Evgeniy Kaufman-Osborn, Tobin Edmonds, Mary Kent, Tyler Lee, Sangyeob Trogler, William C. Kummel, Andrew C. affil: Materials Science and Engineering Program, University of California, San Diego, 9500 Gilman Drive, La Jolla 92093, California, United States Departments of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive, La Jolla 92093, California, United States su: Imaging systems Optics Nitrogen dioxide Nitrogen oxides Copper phthalocyanine sug: subj: Imaging systems Optics Nitrogen dioxide Nitrogen oxides Copper phthalocyanine ab: Ambient NO adsorption onto copper(II) phthalocyanine (CuPc) monolayers is observed using ultrahigh vacuum (UHV) scanning tunneling microscopy (STM) to elucidate the molecular sensing mechanism in CuPc chemical vapor sensors. For low doses (1 ppm for 5 min) of NO at ambient temperatures, isolated chemisorption sites on the CuPc metal centers are observed in STM images. These chemisorbates almost completely desorb from the CuPc monolayer after annealing at 100 °C for 30 min. Conversely, for high NO doses (10 ppm for 5 min), the NO induces a fracture of the CuPc domains. This domain fracture can only be reversed by annealing above 150 °C, which is consistent with dissociative chemisorption into NO and atomic O accompanied by surface restructuring. This high stability implies that the domain fracture results from tightly bound adsorbates, such as atomic O. Existence of atomic O on or under the CuPc layer, which results in domain fracture, is revealed by XPS analysis and ozone-dosing experiments. The observed CuPc domain fracturing is consistent with a mechanism for the dosimetric sensing of NO and other reactive gases by CuPc organic thin film transistors (OTFTs). pubtype: Academic Journal doctype: Article src: R language: English refInfo: copyright: @attributes: flag: Y dt: @attributes: year: 2013 holdings: @attributes: islocal: N |
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