caa a22 4500 463226178 CHVBK 20180405153227.0 cr unu---uuuuu 170326e20070901xx s 000 0 eng 10.1007/s10853-007-1667-x doi (NATIONALLICENCE)springer-10.1007/s10853-007-1667-x Hydrogen adsorption studies in micro-size cobalt dots [Elektronische Daten] [Christian Romero, Jonathan Avila, Edgardo Cisternas, Guerau Cabrera, Alejandro Cabrera, Kristiaan Temst, Margriet Van Bael] Hydrogen desorption curves were obtained from a sample composed of a square arrangement of Co dots with average diameter of 4.4μm, separated by a distance of 11.6μm. A macroscopic sample of Co dots grown on a 2.5×2.5cm Si substrate was made by standard lithographic techniques and used in these experiments. Thermal programmed desorption (TPD) was performed under ultra-high vacuum conditions. Hydrogen TPD curves were obtained from a 1×1cm Co dots samples displaying a maximum of intensity at 425K. Hydrogen TPD curve was also obtained from 1cm×1cm samples of Co films and Co foils for comparison. The hydrogen TPD curves have decreasing intensity from the Co foils to the Co dots and finally to the Co films. This indicates that there are more sites for hydrogen adsorption on the Co dots than in the Co films. This is a surprising result because there is approximately 8.7times less Co atoms exposed in the Co dots that in the Co film sample. A desorption energy of 27kcal/mol was obtained for the Co dots suggesting that hydrogen is adsorbed on an hcp hollow site of the Co dot crystalline structure. Springer Science+Business Media, LLC, 2007 Romero Christian Facultad de Fisica, Pontificia Universidad Catolica de Chile, V. Mackenna 4860, Macul, 6904411, Casilla 306, Santiago 22, Chile aut Avila Jonathan Facultad de Fisica, Pontificia Universidad Catolica de Chile, V. Mackenna 4860, Macul, 6904411, Casilla 306, Santiago 22, Chile aut Cisternas Edgardo Facultad de Fisica, Pontificia Universidad Catolica de Chile, V. Mackenna 4860, Macul, 6904411, Casilla 306, Santiago 22, Chile aut Cabrera Guerau Facultad de Fisica, Pontificia Universidad Catolica de Chile, V. Mackenna 4860, Macul, 6904411, Casilla 306, Santiago 22, Chile aut Cabrera Alejandro Facultad de Fisica, Pontificia Universidad Catolica de Chile, V. Mackenna 4860, Macul, 6904411, Casilla 306, Santiago 22, Chile aut Temst Kristiaan Laboratorium voor Vaste-Stoffysica en Magnetisme, K.U. Leuven, Celestijnenlaan 200 D, 3001, Leuven, Belgium aut Van Bael Margriet Laboratorium voor Vaste-Stoffysica en Magnetisme, K.U. Leuven, Celestijnenlaan 200 D, 3001, Leuven, Belgium aut Journal of Materials Science Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 42/18(2007-09-01), 7667-7672 0022-2461 42:18<7667 2007 42 10853 https://doi.org/10.1007/s10853-007-1667-x text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10853-007-1667-x text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Romero Christian Facultad de Fisica, Pontificia Universidad Catolica de Chile, V. Mackenna 4860, Macul, 6904411, Casilla 306, Santiago 22, Chile aut NATIONALLICENCE 700 1- Avila Jonathan Facultad de Fisica, Pontificia Universidad Catolica de Chile, V. Mackenna 4860, Macul, 6904411, Casilla 306, Santiago 22, Chile aut NATIONALLICENCE 700 1- Cisternas Edgardo Facultad de Fisica, Pontificia Universidad Catolica de Chile, V. Mackenna 4860, Macul, 6904411, Casilla 306, Santiago 22, Chile aut NATIONALLICENCE 700 1- Cabrera Guerau Facultad de Fisica, Pontificia Universidad Catolica de Chile, V. Mackenna 4860, Macul, 6904411, Casilla 306, Santiago 22, Chile aut NATIONALLICENCE 700 1- Cabrera Alejandro Facultad de Fisica, Pontificia Universidad Catolica de Chile, V. Mackenna 4860, Macul, 6904411, Casilla 306, Santiago 22, Chile aut NATIONALLICENCE 700 1- Temst Kristiaan Laboratorium voor Vaste-Stoffysica en Magnetisme, K.U. Leuven, Celestijnenlaan 200 D, 3001, Leuven, Belgium aut NATIONALLICENCE 700 1- Van Bael Margriet Laboratorium voor Vaste-Stoffysica en Magnetisme, K.U. Leuven, Celestijnenlaan 200 D, 3001, Leuven, Belgium aut NATIONALLICENCE 773 0- Journal of Materials Science Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 42/18(2007-09-01), 7667-7672 0022-2461 42:18<7667 2007 42 10853 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer