Figure 6.

PL spectra of an about 3.4-μm diameter porous silicon colloid. After being immersed in 200-mM NADPH aqueous solution during 1 (bottom spectrum) and 5 h (top spectrum).

Ramiro-Manzano et al. Nanoscale Research Letters 2012 7:497   doi:10.1186/1556-276X-7-497
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