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liuth

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A clean glass wafer was treated in a boiling ¡°piranha solution¡±
(30% H2O2/98% H2SO4: 3/7, v/v) at 98 ◦C for 1 h (Caution: piranha
solution is a very strong oxidant and reacts violently with many
organic materials, it must be handledwith extreme care). Then, the
wafer was rinsed thoroughly with plenty of water and dried.
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