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We have fabricated highly efficient CdS/CdSe quantum dot-sensitized solar cells (QDSSCs) featuring low-cost cobalt sulfide (CoS) counter electrodes. Under 100 mW cm(-2) irradiation, the CdS/CdSe QDSSC featuring a CoS electrode provided an energy conversion efficiency as high as 3.4%.

Aggregation löscht Fluoreszenz: Mit 11‐Mercaptoundecansäure (11‐MUA) geschützte Goldnanopartikel (11‐MUA‐AuNPs) sind deutlich beständiger und fluoreszieren viel stärker als die nichtmodifizierten AuNPs. Nach der Zugabe von 2,6‐Pyridindicarbonsäure binden die 11‐MUA‐AuNPs hoch empfindlich und selektiv an HgII‐Ionen, die eine Aggregation induzieren, die zur Fluoreszenzlöschung führt.

We report a simple synthesis of Au-Ag core-shell nanorods (NRs) under alkaline conditions (pH 8.0-10.0) from silver and ascorbate ions using gold nanorods (GNRs) as the seeds. The silver ions that are reduced by the ascorbate ions become deposited on the surfaces of the GNRs to form differently dumbbell-shaped Au-Ag core-shell NRs and nanoparticles, depending on the pH and the concentration of silver ions. The longitudinal plasmon absorbance bands of the Au-Ag core-shell NRs are stronger and appear at shorter wavelengths than those for the original GNRs. We confirmed the formation of Au-Ag core-shell NRs by both energy-dispersive X-ray spectrometry and inductively coupled plasma mass spectrometry measurements, which indicate that the 109Ag/197Au ratios are 0.046, 0.085, and 0.097 at pH 8.0, 9.0, and 10.0, respectively. The transmission electron microscopy measurements show that the Au-Ag core-shell NRs are monodispersed (>90%).