The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
William R Heineman - One of the best experts on this subject based on the ideXlab platform.
-
Manganese Detection with a Metal Catalyst Free Carbon Nanotube Electrode: Anodic versus Cathodic Stripping Voltammetry.
Electroanalysis, 2012Co-Authors: Adam Bange, Bill L. Riehl, Jay M. Johnson, Ian Papautsky, William R HeinemanAbstract:Anodic stripping voltammetry (ASV) and cathodic stripping voltammetry (CSV) were used to determine Mn concentration using metal catalyst Free Carbon nanotube (MCFCNT) electrodes and square wave stripping voltammetry (SWSV). The MCFCNTs are synthesized using a Carbo Thermal Carbide Conversion method which results in a material that does not contain residual transition metals. Detection limits of 120 nM and 93 nM were achieved for ASV and CSV, respectively, with a deposition time of 60 s. CSV was found to be better than ASV in Mn detection in many aspects, such as limit of detection and sensitivity. The CSV method was used in pond water matrix addition measurements.
-
anodic stripping voltammetry of heavy metals on a metal catalyst Free Carbon nanotube electrode
Electroanalysis, 2012Co-Authors: Wei Yue, Bill L. Riehl, Jay M. Johnson, Nebojsa Pantelic, Kevin T Schlueter, Robert A Wilson, Xuefei Guo, Edward E King, William R HeinemanAbstract:Anodic stripping voltammetry (ASV) determination of Pb2+, Cd2+, and Zn2+ was done using metal catalyst Free Carbon nanotube (MCFCN) electrodes. Osteryoung square wave stripping voltammetry (OSWSV) was selected for detection. The MCFCNTs are synthesized via Carbo Thermal Carbide Conversion method which leads to residual transition metal Free in the CNT structure. The new material shows very good results in detecting heavy metal ions, such as Pb2+, Cd2+, and Zn2+. The calculated limits of detection were 13 nM, 32 nM and 50 nM for Pb2+, Cd2+ and Zn2+, respectively with a deposition time of 150 s.
Ali Javey - One of the best experts on this subject based on the ideXlab platform.
-
highly stable hysteresis Free Carbon nanotube thin film transistors by fluoroCarbon polymer encapsulation
ACS Applied Materials & Interfaces, 2014Co-Authors: Daisuke Kiriya, Kevi Che, Ali JaveyAbstract:We report hysteresis-Free Carbon nanotube thin-film transistors (CNT-TFTs) employing a fluoroCarbon polymer (Teflon-AF) as an encapsulation layer. Such fluoroCarbon encapsulation improves device uniformity with excellent operation stability in air and even in water. The fluoropolymers possess high hydrophobicity for efficient removal of water molecules from the vicinity of nanotubes, which are known to induce charge trapping. In addition, the strong dipole associated with the Carbon–fluorine bonds can provide effective screening of the charge carriers in nanotubes from various trap states in the substrate. We also report on the extended applications of encapsulation with Teflon-AF for the realization of dual-gate CNT-TFTs, where one gate is used to control the threshold voltage and the other to switch the device. The fluoroCarbon encapsulation technique presents a promising approach for enhanced device reliability, which is critical for future system-level electronics based on CNTs.
Bill L. Riehl - One of the best experts on this subject based on the ideXlab platform.
-
Manganese Detection with a Metal Catalyst Free Carbon Nanotube Electrode: Anodic versus Cathodic Stripping Voltammetry.
Electroanalysis, 2012Co-Authors: Adam Bange, Bill L. Riehl, Jay M. Johnson, Ian Papautsky, William R HeinemanAbstract:Anodic stripping voltammetry (ASV) and cathodic stripping voltammetry (CSV) were used to determine Mn concentration using metal catalyst Free Carbon nanotube (MCFCNT) electrodes and square wave stripping voltammetry (SWSV). The MCFCNTs are synthesized using a Carbo Thermal Carbide Conversion method which results in a material that does not contain residual transition metals. Detection limits of 120 nM and 93 nM were achieved for ASV and CSV, respectively, with a deposition time of 60 s. CSV was found to be better than ASV in Mn detection in many aspects, such as limit of detection and sensitivity. The CSV method was used in pond water matrix addition measurements.
-
anodic stripping voltammetry of heavy metals on a metal catalyst Free Carbon nanotube electrode
Electroanalysis, 2012Co-Authors: Wei Yue, Bill L. Riehl, Jay M. Johnson, Nebojsa Pantelic, Kevin T Schlueter, Robert A Wilson, Xuefei Guo, Edward E King, William R HeinemanAbstract:Anodic stripping voltammetry (ASV) determination of Pb2+, Cd2+, and Zn2+ was done using metal catalyst Free Carbon nanotube (MCFCN) electrodes. Osteryoung square wave stripping voltammetry (OSWSV) was selected for detection. The MCFCNTs are synthesized via Carbo Thermal Carbide Conversion method which leads to residual transition metal Free in the CNT structure. The new material shows very good results in detecting heavy metal ions, such as Pb2+, Cd2+, and Zn2+. The calculated limits of detection were 13 nM, 32 nM and 50 nM for Pb2+, Cd2+ and Zn2+, respectively with a deposition time of 150 s.
Daisuke Kiriya - One of the best experts on this subject based on the ideXlab platform.
-
highly stable hysteresis Free Carbon nanotube thin film transistors by fluoroCarbon polymer encapsulation
ACS Applied Materials & Interfaces, 2014Co-Authors: Daisuke Kiriya, Kevi Che, Ali JaveyAbstract:We report hysteresis-Free Carbon nanotube thin-film transistors (CNT-TFTs) employing a fluoroCarbon polymer (Teflon-AF) as an encapsulation layer. Such fluoroCarbon encapsulation improves device uniformity with excellent operation stability in air and even in water. The fluoropolymers possess high hydrophobicity for efficient removal of water molecules from the vicinity of nanotubes, which are known to induce charge trapping. In addition, the strong dipole associated with the Carbon–fluorine bonds can provide effective screening of the charge carriers in nanotubes from various trap states in the substrate. We also report on the extended applications of encapsulation with Teflon-AF for the realization of dual-gate CNT-TFTs, where one gate is used to control the threshold voltage and the other to switch the device. The fluoroCarbon encapsulation technique presents a promising approach for enhanced device reliability, which is critical for future system-level electronics based on CNTs.
Weigang Zhang - One of the best experts on this subject based on the ideXlab platform.
-
microstructures of a sic zrc ceramic fiber derived from a polymeric precursor
Materials, 2020Co-Authors: Min Ge, Xiaoxu Lv, Shouquan Yu, Zhenxi Lu, Weigang ZhangAbstract:Continuous ceramic fiber comprising silicon carbide–zirconium carbide (SiC–ZrC) binary phases was obtained through melt spinning, electron-beam curing and pyrolysis of a pre-ceramic precursor of polyzirconocenecarbosilanes (PZCS). After pyrolysis and heat treatment, ZrC particles with mean diameters of 15–20 nm were formed and homogeneously dispersed in a matrix of fine crystalline β-SiC with an average grain size of 6–10 nm. Concentration of Zr in the fiber varies from 14.88% to 17.45% by mass. Fibers consisting of near-stoichiometric ZrC and SiC with little Free Carbon can be obtained through pyrolysis deCarbonization of the as-cured fiber in hydrogen from room temperature to 1000 °C, and subsequently heat treatment in argon up to 1600 °C for 1 h. High-temperature treatment of these amorphous inorganic fibers leads to crystallization of the binary phases of β-SiC and ZrC. The removal of Free Carbon under hydrogen results in more rapid growth of β-SiC and ZrC crystals, in which obvious aggregation of the dispersed ZrC particles among the continuous β-SiC matrix can be ascribed to a fast migration of Zr cation.
