From platelets to sheets: A topochemical phase conversion employing bromine in acetonitrile transforms β-Co(OH)2 into monometallic Co2+–Co3+ layered double hydroxide (LDH) with a Co2+/Co3+ ratio of 2:1 (see the elemental maps of Co, Br, and O in a Br−-intercalated Co2+–Co3+ LDH platelet). Further treatment allows exfoliation of Co2+–Co3+ LDH into positively charged Co(OH)2 nanosheets. Scale bars: 2 μm.
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Ma et al. (2007) studied this question.
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