@Article{BaldanAzevCoutFerr:2013:MoStIm,
               author = "Baldan, Mauricio Ribeiro and Azevedo, Adriana Faria and Couto, A. 
                         B. and Ferreira, Nedenei Gomes",
          affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto 
                         Nacional de Pesquisas Espaciais (INPE)} and {} and {Instituto 
                         Nacional de Pesquisas Espaciais (INPE)}",
                title = "Cathodic and anodic pre-treated boron doped diamond with different 
                         sp 2 content: Morphological, structural, and impedance 
                         spectroscopy characterizations",
              journal = "Journal of Physics and Chemistry of Solids",
                 year = "2013",
               volume = "74",
               number = "12",
                pages = "1830--1835",
             keywords = "Acceptor concentrations, Boron-doped diamond films, Charge 
                         transfer resistance, Electrochemical response, Hot-filament 
                         chemical vapor deposition, Impedance spectroscopy, Surface 
                         conductive layer, Vapour deposition, Chemical vapor deposition, 
                         Electrochemical impedance spectroscopy, Scanning electron 
                         microscopy, Semiconducting gallium compounds, Spectroscopy, 
                         Vapors, Semiconductor doping.",
             abstract = "In this work, the influence of cathodic (Red) and anodic (Ox) 
                         pre-treatment on boron doped diamond (BDD) films grown with 
                         different sp2/sp 3 ratios was systematically studied. The sp2/sp 3 
                         ratios were controlled by the addition of CH4 of 1,3,5 and 7 sccm 
                         in the gas inlet during the growth process. The electrodes were 
                         treated in 0.5 mol L-1 H2SO4 at -3 and 3 V vs Ag/AgCl, 
                         respectively, for 30 min. The electrochemical response of BDD 
                         films was investigated using electrochemical impedance 
                         spectroscopy (EIS) and Mott-Schottky Plot (MSP) measurements. Four 
                         film sample sets were produced in a hot filament chemical vapor 
                         deposition reactor. During the growth process, an additional H2 
                         line passing through a bubbler containing the B 2O3 dissolved in 
                         methanol was used to carry the boron. The scanning electron 
                         microscopy morphology showed well faced films with a small 
                         decrease in their grain size as the CH4 concentration increased. 
                         The Raman spectra depicted a pronounced sp2 band, mainly for films 
                         with 5 and 7 sccm of CH4. MSP showed a decrease in the acceptor 
                         concentration as the CH4 increased indicating the CH4 influence on 
                         the doping process for Red-BDD and Ox-BDD samples. Nonetheless, an 
                         apparent increase in the acceptor concentrations for both Ox-BDD 
                         samples was observed compared to that for Red-BDD samples, mainly 
                         attributed to the surface conductive layer (SCL) formation after 
                         this strong oxidation process. The EIS Nyquist plots for Red-BDD 
                         showed a capacitance increase for the films with higher sp2 
                         content (5 and 7 sccm). On the other hand, the Nyquist plots for 
                         Ox-BDD can be described as semicircles near the origin, at high 
                         frequencies, where their charge transfer resistance strongly 
                         varied with the sp2 increase in such films. © 2013 Elsevier Ltd.",
                  doi = "10.1016/j.jpcs.2013.07.015",
                  url = "http://dx.doi.org/10.1016/j.jpcs.2013.07.015",
                 issn = "0022-3697",
                label = "scopus 2013-11",
             language = "en",
           targetfile = "CTE170.pdf",
        urlaccessdate = "30 abr. 2024"
}