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. Author manuscript; available in PMC: 2011 May 12.
Published in final edited form as: Nano Lett. 2010 May 12;10(5):1941–1949. doi: 10.1021/nl101010m

Figure 5.

Figure 5

Photocatalytic properties of Pt/Si/Ag photodiode. (a) Photodegradation of indigo carmine (IC) with 1.2 × 108 Pt/Si/Ag photodiodes dispersed in 10 ml of 100 μM IC aqueous solution. The degradation was characterized by the ratio of measured concentration to its original concentration. The triangles represent the photodegradation reaction of IC without photodiodes. The squares represent the same photodegradation reaction of IC with Pt/Si/Ag photodiodes. (b) Estimated QE of Pt/Si/Ag nanowire photodiodes within visible light range. For the reaction, 6×108 Pt/Si/Ag nanowire photodiodes were dispersed in 2 ml of 10 mM IC aqueous solution. The mixture was exposed to a selected wavelength for 30 minutes for each wavelength. (c) Photocatalytic stability of the Pt/Si/Ag photodiodes in the IC degradation reaction. The experiment is carried out with 2.0 × 107 diodes dispersed in 1 ml of 50μM IC solution with the initial 98% degradation of the IC dye. (d) Plot of the total amount of formic acid with respect to the reaction time. In this reaction, 300 sccm CO2 and 300 sccm H2 were bubbled through 40 ml of 0.04 M Na2CO3 solution containing 1× 108 Pt/Si/Ag nanowire photodiodes.