Abstract
The electron spin resonance characteristics of silver (Ag)-doped PbS nanorods have been investigated here. We show that both Ag0 and Ag2+ centres can be simultaneously created in PbS nanorod structures grown in polymers. Structural investigations reveal that strain-induced distortion of PbS lattice can lead to the formation of hole traps in as-grown samples. Large strain-induced binding of the Ag+ ions into the Pb2+ vacancies lowers the activation energy of diffusion significantly. The isomorphic substitution of Ag+ in PbS host is then converted into Ag0 and Ag2+ paramagnetic centres to maintain the charge neutrality and cation–anion ratio, confirmed by electron spin resonance investigations.
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