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a, b Low- and high-magnification FESEM images of as-prepared γ-MnS when 1 mmol l-cysteine was used. c, d Low- and high-magnification FESEM images of as-prepared γ-MnS when 3 mmol l-cysteine was used. e XRD patterns of as-prepared γ-MnS when a different amount of l-cysteine was employed
