Abstract
A 33-GHz microwave Hall effect detection system is described which is capable of measuring charge carrier mobility values larger than about 3 × 10-5 m2/V sec. An important advantage of this electrodeless technique for measurements on biological materials is that macroscopic defects do not mask the desired microscopic electronic properties. For several polypeptides and protein samples the results are consistent with a conduction mechanism involving the hopping or tunneling of charge carriers between localized energy states. However, for collagen-methylglyoxal samples a relatively large p-type Hall effect has been observed which not only indicates the possibility of conduction in a band of extended states, but also gives strong support to the concept that methylglyoxal can act as an electron acceptor in charge-transfer interactions with protein molecules.
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