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Search Results: 1 - 10 of 6235 matches for " boron-doped diamond film "
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Effects of the surface-adsorption of boron-doped diamond electrode on its electrochemical behavior
Fengbin Liu,Xuemin Li,Jiadao Wang,Bing Liu,Darong Chen
Chinese Science Bulletin , 2006, DOI: 10.1007/s11434-006-2024-1
Abstract: To elucidate the effects of the hydrogenation and oxygenation of the boron-doped diamond (BDD) electrode on its electrochemical behaviors, the surface morphologies and phases of the two surface-adsorption BDD films have been investigated and the cyclic voltammograms and AC impedance spectra have been measured at these two BDD electrodes. The results indicate that compared with the hydrogen-adsorption BDD film, oxygen-adsorption BDD film is less conductive, and has a larger surface roughness and a lower sp3/sp2 ratio. The oxygenated BDD film electrode possesses a wider electrochemical window, larger diamond film resistance and capacitance and a larger polarization resistance than hydrogenated BDD electrode. In addition, the effect mechanism of the surface-adsorption of BDD electrode on its electrochemical behaviors has been discussed.
Electronic structures of hydrogenated and oxygenated boron-doped diamond films
氢、氧终端掺硼金刚石薄膜的电子结构

Liu Feng-Bin,Wang Jia-Dao,Chen Da-Rong,
刘峰斌
,汪家道,陈大融

物理学报 , 2008,
Abstract: The hydrogenated and oxygenated boron-doped diamond films have been prepared by hydrogen-plasma treatment and boiling in the strong acids, respectively. By means of the X-ray photoelectron spectroscopy and contact angle measurements, the two surface-terminated diamond films have been evaluated. The scanning tunneling spectra have been measured by scanning probe microscope. The results indicated that for the hydrogenated diamond surface, the surface energy bands bend downwards and there exists a shallow acceptor above the valence band maximum. However, the surface energy bands for the oxygenated film bends upwards and its band gap is wide and clean. The conduction mechanisms for the two surface-terminated diamond films have been discussed.
Electronic structures of hydrogenated and oxygenated boron-doped diamond films
氢、氧终端掺硼金刚石薄膜的电子结构

Liu Feng-Bin,Wang Jia-Dao,Chen Da-Rong,
刘峰斌
,汪家道,陈大融

中国物理 B , 2008,
Abstract: The hydrogenated and oxygenated boron-doped diamond films have been prepared by hydrogen-plasma treatment and boiling in the strong acids, respectively. By means of the X-ray photoelectron spectroscopy and contact angle measurements, the two surface-terminated diamond films have been evaluated. The scanning tunneling spectra have been measured by scanning probe microscope. The results indicated that for the hydrogenated diamond surface, the surface energy bands bend downwards and there exists a shallow acceptor above the valence band maximum. However, the surface energy bands for the oxygenated film bends upwards and its band gap is wide and clean. The conduction mechanisms for the two surface-terminated diamond films have been discussed.
Doped Diamond: A Compact Review on a New, Versatile Electrode Material
Alexander Kraft
International Journal of Electrochemical Science , 2007,
Abstract: The present paper gives an overview on the current development status of doped-diamond electrodes for electrochemical applications. It starts with a short discussion on the different types of diamond electrodes and their preparation methods. This is followed by a summary of the electrochemical properties of diamond electrodes in different electrolytes. Modification strategies for doped-diamond electrodes are discussed as an important technology to change their electrochemical properties. The second part of the paper deals with practical applications of diamond electrodes from water treatment to inorganic and organic electrosynthesis, electroanalysis and electrochemical energy technology to biotechnology.
Analytical Determination of Benzophenone-3 in Sunscreen Preparations Using Boron-Doped Diamond Electrodes  [PDF]
Michelli Thomaz Laranjeira, Fabio de Lima, Silvio Cesar de Oliveira, Valdir Souza Ferreira, Robson Tadeu Soares de Oliveira
American Journal of Analytical Chemistry (AJAC) , 2011, DOI: 10.4236/ajac.2011.23047
Abstract: A new electroanalytical procedure was developed for the determination of Benzophenone-3 (BENZO) in commercial sunscreen as the active ingredient. The procedure is based on the use of electrochemical methods as cyclic and square-wave voltammetry, with boron-doped diamond (BDD) electrodes. The reduction of BENZO in Britton-Robinson buffer (0.1 mol●L–1) using this type of electrode gives rise to one irreversible peak in –1.30 V (versus Ag/AgCl) in presence of cationic surfactant cetyltrimethylammonium bromide (CTABr). The proposed electrochemical method was successfully applied to the analysis of commercially available pharmaceutical preparations.
Potencialidades do uso de ultrassom na determina??o do pesticida carbaril empregando eletrodos de diamante
Garbellini, Gustavo S.;Avaca, Luis A.;Salazar-Banda, Giancarlo R.;
Química Nova , 2010, DOI: 10.1590/S0100-40422010001000039
Abstract: the potentiality of the use of ultrasound radiation in association with a boron-doped diamond electrode was evaluated on the voltammetric determination of the pesticide carbaryl. improvements in the sensitivity, limit of detection and reproducibility of the measurements were observed due to both, the enhancement of mass transport and the cleaning of the electrode surface provided by ultrasound. satisfactory recovery levels for carbaryl in pure water (96-98%) and pineapple juice (89-92%) for quiescent and sonovoltammetric methodologies were obtained. these methodologies can be alternative tools for the analyses of pesticides in fruit samples, mainly the insonated condition that improve the analytical performance and dispense intermediary cleanings of the electrode surface.
A Rapid Separation and Highly Determination of Paraben Species by Ultra-Performance Liquid Chromatography —Electrochemical Detection  [PDF]
Maneenuch Chuto, Sudkate Chaiyo, Weena Siangproh, Orawon Chailapakul
Detection (Detection) , 2013, DOI: 10.4236/detection.2013.12004
Abstract: In this study, a new technique was developed using rapid ultra-performance liquid chromatography (UPLC)-based separation coupled with electrochemical detection by a boron-doped diamond (BDD) electrode for the detection and quantification of three commonly used parabens (methylparaben (MP), ethylparaben (EP) and propylparaben (PP)). We aimed to reduce the analysis time by using UPLC coupled with a short reverse phase C 18 monolithic column (25 mm×4.6 mm). Operating the monolithic column at low back-pressure resulted in high flow rates. A mobile phaseconsisting of a 25:75 (v/v) ratio of acetonitrile:0.05 Mphosphate buffer (pH 5) at a flow rate of 2.5 mL·min?1 was used to perform the separation. The amperometric detection with the BDD electrode was found to be optimal and reliably reproducible at a detection potential of 1.5 V vs. Ag/AgCl. Under these conditions, the separation of the three targetanalytes (MP, EP and PP) was achieved in 2 min and was linear within a sample concentration range of 0.1 to 50.0 mg·L?1 (r2 values of 0.9970, 0.9994 and 0.9994 for MP, EP and PP, respectively). This method was successfully applied to determine the concentrations of each parabeninsix real samples with therecoveries ranging from of 80.3% - 98.9% for all three parabensfrom samples spiked at 12, 22 and 32 mg·L?1. Therefore, the proposed method can be used as an alternative rapid and selective method for the determination of paraben levels in real samples.
Filmes de diamante CVD dopado com boro. Parte I . Histórico, produ??o e caracteriza??o
Barros, Rita de Cássia Mendes de;Ribeiro, Mauro Celso;An-Sumodjo, Paulo Teng;Juli?o, Murilo Sérgio da Silva;Serrano, Sílvia Helena Pires;Ferreira, Neidenêi Gomes;
Química Nova , 2005, DOI: 10.1590/S0100-40422005000200024
Abstract: this review presents a brief account concerning the production, characterization and evolution of the knowledge in the area of diamond and boron-doped diamond films. the most important methods used for the growth of these films, such as chemical vapor deposition and high pressure/high temperature systems, as well as the several kinds of reactors which can be employed are reviewed. however, larger emphasis is given to the cvd method. morphological, structural and electric properties of these films, as well as their role in the performance of voltammetric electrodes for electrochemistry and electroanalytical chemistry are also discussed.
Pulsed Amperometry for Anti-fouling of Boron-doped Diamond in Electroanalysis of β-Agonists: Application to Flow Injection for Pharmaceutical Analysis
Chanpen Karuwan,Thitirat Mantim,Patcharin Chaisuwan,Prapin Wilairat,Kate Grudpan,Piyada Jittangprasert,Yasuaki Einaga,Orawon Chailapakul,Leena Suntornsuk,Oraphan Anurukvorakun,Duangjai Nacapricha
Sensors , 2006, DOI: 10.3390/s6121837
Abstract: This work presents the construction and application of boron-doped diamond(BDD) thin film electrode as sensor for the determination of three β-agonists, viz.salbutamol, terbutaline and clenbuterol. Although well-known as a chemically inertmaterial, BDD film however shows fouling in detection of these compounds using fixedpotentialmode amperometry. A suitable waveform for pulsed amperometric detection(PAD) was developed and used to determine the agonist compounds. It was seen that thedeveloped PAD significantly refreshed the BDD surface for long-term detection in flowinjection analysis. Linear working ranges were 0.5-100 μM, 1.0-100 μM and 0.5-50 μM forsalbutamol, terbutaline and clenbuterol, respectively. The developed PAD-BDD system wasapplied to successfully determine salbutamol and terbutaline in commercial pharmaceuticalproducts. The methods were validated with a capillary electrophoresis method.
The influence of electrochemical pre-treatment of B-doped diamond films on the electrodeposition of Pt
Ribeiro, Mauro C.;Silva, Leide G. da;Sumodjo, Paulo T. A.;
Journal of the Brazilian Chemical Society , 2006, DOI: 10.1590/S0103-50532006000400006
Abstract: the influence of the substrate electrochemical pre-treatment in 0.5 mol l-1 h2so4 on the pt electrodeposition on boron-doped diamond, bdd, film electrodes was investigated. platinum cannot be electrodeposited on a freshly prepared bdd electrode; however, potentiodynamic cycling or anodic potential steps at short times does activate the electrode. anodic pre-treatment plays a dual role in the behavior of pt deposition on bdd surfaces: pt deposition is increased at short-term anodic pre-treatments, whereas at longer pre-treatment times pt deposition was inhibited. these facts are explained in terms of wettability changes and passivation of the surface. conversely, the oxide layer formed in these treatments increases the dispersion level of the catalyst.
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