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Field‐Structured Chemiresistors: Field‐Structured Chemiresistors (Adv. Funct. Mater. 10/2010)
Author(s) -
Read Douglas H.,
Martin James E.
Publication year - 2010
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201090039
Subject(s) - materials science , conductor , nanotechnology , insulator (electricity) , field (mathematics) , polymer , optoelectronics , composite material , mathematics , pure mathematics
D. H. Read and J. E. Martin report on page 1577 the use of field‐structured composites as improved chemiresistors. Magnetic fields are used to organize Au‐coated magnetic particles into electrically conducting pathways within a polymer matrix. Though many structures are possible, a biaxial field leads to stacked particle sheets, as illustrated on the cover. These sensors undergo a reversible conductor–insulator transition over such a narrow concentration range that they behave like chemical switches. This switching point is tuned by controlling polymer stresses.