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Free-standing porous GaP membranes were fabricated by anodic etching of (111)-oriented crystalline substrates in H 2 SO 4 aqueous solution. The formation of a column-shaped porous structure with average structure dimension of 50nm was proved by SEM-investigations. Raman measurements on both as-grown bulk and porous GaP were performed. Porous membranes were measured under different...
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