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The Journal Citation Reports of the Science Citation Index 2004 were used todelineate a core set of nanotechnology journals and a nanotechnology-relevantset. In comparison with 2003, the core set has grown and the relevant set hasdecreased. This suggests a higher degree of codification in the field ofnanotechnology: the field has become more focused in terms of citationpractices. Using the citing patterns among journals at the aggregate level, acore group of ten nanotechnology journals in the vector space can be delineatedon the criterion of betweenness centrality. National contributions to this coregroup of journals are evaluated for the years 2003, 2004, and 2005.Additionally, the specific class of nanotechnology patents in the database ofthe U.S. Patent and Trade Office (USPTO) is analyzed to determine if non-patentliterature references can be used as a source for the delineation of theknowledge base in terms of scientific journals. The references are primarily togeneral science journals and letters, and therefore not specific enough for thepurpose of delineating a journal set.

Nanotechnology as a Field of Science: Its Delineation in terms of Journals and Patents