Advanced Functional Materials

Cover image for Vol. 25 Issue 33

20_10b/2010Field-Structured Chemiresistors: Field-Structured Chemiresistors (Adv. Funct. Mater. 10/2010)

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.

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