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Material-based sensors have attracted an enormous amount of recent interest. Biological1 and chemical sensors2 are being rapidly developed to offer sensitivity and specificity for the analyte of choice. In addition, there has been growing material science interest in the creation of “smart materials,”3,4 capable of fast, reversible responses to environmental stimuli.
The electronic structures of pyrite-type transition-metal chalcogenides MS 2−x Se x (MFe, Co, Ni) has been investigated by photoemission and inverse-photoemission spectroscopy. The valence-band spectrum of ferromagnetic CoS 2 does not show exchange splitting of the Co 3d peak, in disagreement with band-structure calculations. High-resolution photoemission spectra of NiS ...
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