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Fabrication of highly integrated gas sensor array by EHD printing of electrospun nanofibers: (a) metal oxide nanofiber fragments are prepared by electrospinning and fragmentation process (e.g., ultrasonication); (b) individual gas sensor and highly integrated gas sensor array were fabricated by micro-patterning of heterogeneous metal oxide nanofibers via sequential or parallel EHD printing process. Reprinted with permission from [372]. Copyright 2017 Elsevier.
