Journal
CHEMICAL PHYSICS LETTERS
Volume 354, Issue 1-2, Pages 165-172Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S0009-2614(02)00146-X
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We measured, for the first time, the oxidation enthalpies of both molybdenum (Mo) and tungsten (W) nanoclusters at several cluster sizes. We observed that the oxidation enthalpies of both Mo and W nanoclusters went down to the corresponding bulk values, respectively, with increasing cluster size. By using the oxidation enthalpies, we estimated the formation enthalpies by using H-nanocluster = O-nanocluster - O-bulk. The formation enthalpies of both Mo and W nanoclusters were all positive and went down to the bulk value (defined as 0 kcal/mol), indicating that the thermal stabilities of both Mo and W nanoclusters improved toward the bulk state with increasing cluster size. (C) 2002 Elsevier Science B.V. All rights reserved.
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